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Climate and Average Weather Year Round in Duluth Minnesota, United States

In Duluth, the summers are comfortable; the winters are freezing, snowy, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 7°F to 78°F and is rarely below -15°F or above 88°F.

Based on the tourism score, the best time of year to visit Duluth for warm-weather activities is from early July to late August.

Climate in Duluth

freezingvery coldcoldcoolwarmcoolcoldfreezingJanFebMarAprMayJunJulAugSepOctNovDecNowNow71%71%37%37%clearovercastprecipitation: 3.9 inprecipitation: 3.9 in0.4 in0.4 inmuggy: 20%muggy: 20%0%0%drydrytourism score: 7.1tourism score: 7.10.00.0
Duluth weather by month. Click on each chart for more information.

The warm season lasts for 3.3 months, from June 5 to September 14, with an average daily high temperature above 67°F. The hottest month of the year in Duluth is July, with an average high of 77°F and low of 60°F.

The cold season lasts for 3.4 months, from November 26 to March 7, with an average daily high temperature below 33°F. The coldest month of the year in Duluth is January, with an average low of 8°F and high of 23°F.

Average High and Low Temperature in Duluth

Average High and Low Temperature in DuluthwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-20°F-20°F-10°F-10°F0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2022°FJan 2022°FJul 1878°FJul 1878°F7°F7°F60°F60°FJun 567°FJun 567°FSep 1467°FSep 1467°FNov 2633°FNov 2633°FMar 733°FMar 733°F49°F49°F52°F52°F22°F22°F18°F18°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 23°F27°F37°F49°F61°F70°F77°F75°F66°F53°F39°F26°F
Temp. 14°F18°F28°F40°F50°F60°F68°F67°F58°F46°F33°F19°F
Low 8°F11°F22°F34°F43°F52°F60°F59°F51°F40°F27°F14°F

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in Duluth

Average Hourly Temperature in DuluthJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowfrigidfrigidfreezingfreezingvery coldcoldcoldcoolcomfortablevery coldfrigidcomfortable
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Astghadzor, Armenia (5,893 miles away) and Ashibetsu, Japan (5,379 miles) are the far-away foreign places with temperatures most similar to Duluth (view comparison).

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In Duluth, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Duluth begins around June 7 and lasts for 4.0 months, ending around October 9.

The clearest month of the year in Duluth is August, during which on average the sky is clear, mostly clear, or partly cloudy 69% of the time.

The cloudier part of the year begins around October 9 and lasts for 8.0 months, ending around June 7.

The cloudiest month of the year in Duluth is January, during which on average the sky is overcast or mostly cloudy 63% of the time.

Cloud Cover Categories in Duluth

Cloud Cover Categories in DuluthclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 3171%Jul 3171%Jan 2537%Jan 2537%Jun 754%Jun 754%Oct 954%Oct 954%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 63%62%58%55%51%43%32%31%39%48%55%62%
Clearer 37%38%42%45%49%57%68%69%61%52%45%38%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Duluth varies significantly throughout the year.

The wetter season lasts 6.0 months, from April 14 to October 15, with a greater than 24% chance of a given day being a wet day. The month with the most wet days in Duluth is June, with an average of 11.8 days with at least 0.04 inches of precipitation.

The drier season lasts 6.0 months, from October 15 to April 14. The month with the fewest wet days in Duluth is February, with an average of 2.4 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation in Duluth changes throughout the year.

Rain alone is the most common for 8.7 months, from March 13 to December 2. The month with the most days of rain alone in Duluth is June, with an average of 11.8 days.

Snow alone is the most common for 3.3 months, from December 2 to March 13. The month with the most days of snow alone in Duluth is December, with an average of 2.3 days.

Daily Chance of Precipitation in Duluth

Daily Chance of Precipitation in DuluthsnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jun 2441%Jun 2441%Feb 37%Feb 37%Mar 1314%Mar 1314%Dec 214%Dec 214%Apr 1424%Apr 1424%Oct 1524%Oct 1524%NowNowsnowrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 0.3d0.4d2.2d5.5d9.5d11.8d11.3d10.7d9.4d7.0d3.3d1.0d
Mixed 0.3d0.3d0.8d1.0d0.1d0.0d0.0d0.0d0.0d0.1d0.6d0.5d
Snow 2.1d1.7d1.7d0.5d0.0d0.0d0.0d0.0d0.0d0.1d1.0d2.3d
Any 2.7d2.4d4.8d7.0d9.6d11.8d11.3d10.7d9.4d7.2d4.9d3.8d

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Duluth experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 9.0 months, from March 8 to December 7, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Duluth is June, with an average rainfall of 3.8 inches.

The rainless period of the year lasts for 3.0 months, from December 7 to March 8. The month with the least rain in Duluth is January, with an average rainfall of 0.1 inches.

Average Monthly Rainfall in Duluth

Average Monthly Rainfall in DuluthrainJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 in7 in7 inJun 213.9 inJun 213.9 inJan 260.1 inJan 260.1 inSep 13.2 inSep 13.2 inMar 80.5 inMar 80.5 inDec 70.5 inDec 70.5 in
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 0.1″0.2″0.7″1.8″2.8″3.8″3.3″3.1″3.1″2.1″1.1″0.3″

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Duluth experiences significant seasonal variation in monthly snowfall.

The snowy period of the year lasts for 6.3 months, from October 24 to May 2, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Duluth is March, with an average snowfall of 4.3 inches.

The snowless period of the year lasts for 5.7 months, from May 2 to October 24. The least snow falls around July 16, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Duluth

Average Monthly Snowfall in DuluthsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 inMar 74.7 inMar 74.7 inJul 160.0 inJul 160.0 inJan 34.3 inJan 34.3 inOct 241.0 inOct 241.0 inMay 21.0 inMay 21.0 inNowNow
The average snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Snowfall 3.8″3.8″4.3″2.5″0.2″0.0″0.0″0.0″0.0″0.5″2.8″4.2″

The length of the day in Duluth varies significantly over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 32 minutes of daylight; the longest day is June 20, with 15 hours, 52 minutes of daylight.

Hours of Daylight and Twilight in Duluth

Hours of Daylight and Twilight in DuluthJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 1912 hr, 8 minMar 1915 hr, 52 minJun 2015 hr, 52 minJun 2012 hr, 12 minSep 2212 hr, 12 minSep 228 hr, 32 minDec 218 hr, 32 minDec 21nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 9.0h10.3h12.0h13.6h15.1h15.8h15.4h14.1h12.5h10.8h9.4h8.6h

The earliest sunrise is at 5:13 AM on June 15, and the latest sunrise is 2 hours, 40 minutes later at 7:53 AM on January 2. The earliest sunset is at 4:20 PM on December 10, and the latest sunset is 4 hours, 47 minutes later at 9:06 PM on June 25.

Daylight saving time (DST) is observed in Duluth during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time in Duluth

Sunrise & Sunset with Twilight and Daylight Saving Time in DuluthJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 155:13 AMJun 155:13 AM9:06 PMJun 259:06 PMJun 25Dec 104:20 PMDec 104:20 PM7:53 AMJan 27:53 AMJan 2Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in Duluth

Solar Elevation and Azimuth in DuluthJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM0001010101020203030304040506000010101020202020303040405050602067NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases in Duluth

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Duluth experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 2.8 months, from June 20 to September 13, during which time the comfort level is muggy, oppressive, or miserable at least 5% of the time. The month with the most muggy days in Duluth is July, with 5.1 days that are muggy or worse.

The least muggy day of the year is March 2, when muggy conditions are essentially unheard of.

Humidity Comfort Levels in Duluth

Humidity Comfort Levels in DuluthmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Mar 20%Mar 20%Jul 2520%Jul 2520%Jun 205%Jun 205%Sep 135%Sep 135%NowNowmuggymuggycomfortablecomfortabledrydryhumidhumid
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.0d1.2d5.1d4.5d1.4d0.0d0.0d0.0d

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Duluth experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 7.8 months, from September 18 to May 13, with average wind speeds of more than 9.6 miles per hour. The windiest month of the year in Duluth is January, with an average hourly wind speed of 11.0 miles per hour.

The calmer time of year lasts for 4.2 months, from May 13 to September 18. The calmest month of the year in Duluth is July, with an average hourly wind speed of 8.3 miles per hour.

Average Wind Speed in Duluth

Average Wind Speed in DuluthwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mphJan 1511.1 mphJan 1511.1 mphJul 308.0 mphJul 308.0 mphSep 189.6 mphSep 189.6 mphMay 139.6 mphMay 139.6 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 11.011.010.810.69.48.78.38.49.510.110.210.5

The predominant average hourly wind direction in Duluth varies throughout the year.

The wind is most often from the north for 1.1 months, from February 24 to March 28, with a peak percentage of 31% on February 24. The wind is most often from the east for 2.5 months, from March 28 to June 12, with a peak percentage of 35% on May 11. The wind is most often from the west for 2.2 months, from June 12 to August 17 and for 5.4 months, from September 12 to February 24, with a peak percentage of 34% on July 31.

Wind Direction in Duluth

Wind Direction in DuluthWNEWSWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Duluth is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 1.9 months, from July 22 to September 19, with an average temperature above 57°F. The month of the year in Duluth with the warmest water is August, with an average temperature of 62°F.

The time of year with cooler water lasts for 5.8 months, from December 4 to May 29, with an average temperature below 40°F. The month of the year in Duluth with the coolest water is March, with an average temperature of 34°F.

Average Water Temperature in Duluth

Average Water Temperature in DuluthwarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°FAug 1862°FAug 1862°F34°FMar 234°FMar 2Sep 1957°FSep 1957°FDec 440°FDec 440°FMay 2940°FMay 2940°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 36°F34°F34°F36°F38°F44°F54°F62°F58°F49°F43°F38°F

To characterize how pleasant the weather is in Duluth throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Duluth for general outdoor tourist activities is from early July to late August, with a peak score in the first week of August.

Tourism Score in Duluth

Tourism Score in Duluthbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.17.10.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Duluth for hot-weather activities is from mid July to early August, with a peak score in the last week of July.

Beach/Pool Score in Duluth

Beach/Pool Score in DuluthJanFebMarAprMayJunJulAugSepOctNovDec002244668810103.83.80.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationbeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Duluth typically lasts for 5.5 months (166 days), from around April 29 to around October 12, rarely starting before April 6 or after May 24, and rarely ending before September 23 or after November 4.

Time Spent in Various Temperature Bands and the Growing Season in Duluth

Time Spent in Various Temperature Bands and the Growing Season in Duluthgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Apr 2950%Apr 2950%Oct 1250%Oct 1250%May 2490%May 2490%Sep 2390%Sep 2390%Apr 610%Apr 610%Nov 410%Nov 410%0%Feb 90%Feb 9Aug 6100%Aug 6100%NowNowfrigidfreezingvery coldcoldcoolcomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Duluth should appear around May 16, only rarely appearing before May 5 or after June 1.

Growing Degree Days in Duluth

Growing Degree Days in DuluthJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°FMay 1690°FMay 1690°FJul 25900°FJul 25900°FOct 31,800°FOct 31,800°FDec 311,859°FDec 311,859°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.5 months, from May 3 to August 21, with an average daily incident shortwave energy per square meter above 5.7 kWh. The brightest month of the year in Duluth is July, with an average of 6.7 kWh.

The darker period of the year lasts for 3.5 months, from October 27 to February 11, with an average daily incident shortwave energy per square meter below 2.4 kWh. The darkest month of the year in Duluth is December, with an average of 1.3 kWh.

Average Daily Incident Shortwave Solar Energy in Duluth

Average Daily Incident Shortwave Solar Energy in DuluthbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJul 96.8 kWhJul 96.8 kWhDec 151.2 kWhDec 151.2 kWhMay 35.7 kWhMay 35.7 kWhAug 215.7 kWhAug 215.7 kWhOct 272.4 kWhOct 272.4 kWhFeb 112.4 kWhFeb 112.4 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 1.62.53.85.06.16.66.75.94.42.81.71.3

For the purposes of this report, the geographical coordinates of Duluth are 46.783 deg latitude, -92.107 deg longitude, and 696 ft elevation.

The topography within 2 miles of Duluth contains significant variations in elevation, with a maximum elevation change of 764 feet and an average elevation above sea level of 848 feet. Within 10 miles contains significant variations in elevation (899 feet). Within 50 miles also contains very significant variations in elevation (1,368 feet).

The area within 2 miles of Duluth is covered by water (38%), artificial surfaces (36%), and trees (14%), within 10 miles by trees (48%) and water (34%), and within 50 miles by trees (74%) and water (14%).

This report illustrates the typical weather in Duluth, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Duluth.

For each station, the records are corrected for the elevation difference between that station and Duluth according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Duluth is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Duluth and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Duluth and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.