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Climate and Average Weather Year Round in Saint Johnsbury Vermont, United States

In Saint Johnsbury, the summers are comfortable, wet, and partly cloudy and the winters are freezing, snowy, and mostly cloudy. Over the course of the year, the temperature typically varies from 7°F to 78°F and is rarely below -12°F or above 86°F.

Based on the tourism score, the best time of year to visit Saint Johnsbury for warm-weather activities is from late June to late August.

Climate in Saint Johnsbury

freezingvery coldcoldcoolwarmcoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDecNowNow61%61%27%27%overcastclearprecipitation: 3.9 inprecipitation: 3.9 in2.0 in2.0 inmuggy: 15%muggy: 15%0%0%drydrytourism score: 6.1tourism score: 6.10.00.0
Saint Johnsbury weather by month. Click on each chart for more information.

The warm season lasts for 3.8 months, from May 22 to September 16, with an average daily high temperature above 67°F. The hottest month of the year in Saint Johnsbury is July, with an average high of 78°F and low of 57°F.

The cold season lasts for 3.4 months, from November 30 to March 10, with an average daily high temperature below 36°F. The coldest month of the year in Saint Johnsbury is January, with an average low of 9°F and high of 26°F.

Average High and Low Temperature in Saint Johnsbury

Average High and Low Temperature in Saint JohnsburywarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-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 2926°FJan 2926°FJul 1978°FJul 1978°F7°F7°F58°F58°FMay 2267°FMay 2267°FSep 1667°FSep 1667°FNov 3036°FNov 3036°FMar 1036°FMar 1036°F45°F45°F48°F48°F22°F22°F17°F17°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 26°F30°F39°F54°F66°F74°F78°F75°F67°F55°F42°F31°F
Temp. 16°F19°F29°F42°F54°F63°F67°F65°F57°F45°F35°F23°F
Low 9°F10°F21°F33°F43°F53°F57°F55°F48°F37°F27°F16°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 Saint Johnsbury

Average Hourly Temperature in Saint JohnsburyJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowfrigidfreezingfreezingvery coldvery coldcoldcoldcoolcomfortablewarmfrigidfreezing
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.

Tsaghkadzor, Armenia (5,384 miles away) is the far-away foreign place with temperatures most similar to Saint Johnsbury (view comparison).

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Compare Saint Johnsbury to another city:

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In Saint Johnsbury, 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 Saint Johnsbury begins around June 8 and lasts for 4.7 months, ending around October 30.

The clearest month of the year in Saint Johnsbury is August, during which on average the sky is clear, mostly clear, or partly cloudy 60% of the time.

The cloudier part of the year begins around October 30 and lasts for 7.3 months, ending around June 8.

The cloudiest month of the year in Saint Johnsbury is January, during which on average the sky is overcast or mostly cloudy 72% of the time.

Cloud Cover Categories in Saint Johnsbury

Cloud Cover Categories in Saint JohnsburyclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 161%Sep 161%Jan 427%Jan 427%Jun 844%Jun 844%Oct 3044%Oct 3044%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 72%70%65%59%58%53%43%40%43%51%61%69%
Clearer 28%30%35%41%42%47%57%60%57%49%39%31%

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

The wetter season lasts 5.9 months, from April 9 to October 7, with a greater than 32% chance of a given day being a wet day. The month with the most wet days in Saint Johnsbury is July, with an average of 13.0 days with at least 0.04 inches of precipitation.

The drier season lasts 6.1 months, from October 7 to April 9. The month with the fewest wet days in Saint Johnsbury is February, with an average of 6.3 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 Saint Johnsbury changes throughout the year.

Rain alone is the most common for 8.8 months, from March 11 to December 4. The month with the most days of rain alone in Saint Johnsbury is July, with an average of 13.0 days.

Snow alone is the most common for 3.2 months, from December 4 to March 11. The month with the most days of snow alone in Saint Johnsbury is January, with an average of 4.0 days.

Daily Chance of Precipitation in Saint Johnsbury

Daily Chance of Precipitation in Saint JohnsburysnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 644%Jul 644%Feb 320%Feb 320%Mar 1124%Mar 1124%Dec 427%Dec 427%Apr 932%Apr 932%Oct 732%Oct 732%NowNowsnowrainmixed
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 1.2d1.4d3.7d7.6d10.8d12.3d13.0d11.5d9.8d8.9d5.6d2.3d
Mixed 1.9d1.7d2.2d1.4d0.1d0.0d0.0d0.0d0.0d0.4d1.6d2.5d
Snow 4.0d3.2d2.3d0.3d0.0d0.0d0.0d0.0d0.0d0.1d1.1d3.8d
Any 7.1d6.3d8.1d9.3d10.9d12.3d13.0d11.5d9.8d9.3d8.2d8.5d

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. Saint Johnsbury experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Saint Johnsbury. The month with the most rain in Saint Johnsbury is July, with an average rainfall of 3.8 inches.

The month with the least rain in Saint Johnsbury is February, with an average rainfall of 0.7 inches.

Average Monthly Rainfall in Saint Johnsbury

Average Monthly Rainfall in Saint JohnsburyJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 inJul 223.9 inJul 223.9 inFeb 70.7 inFeb 70.7 inSep 293.5 inSep 293.5 inNowNow
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 0.8″0.7″1.3″2.4″3.3″3.7″3.8″3.5″3.4″3.3″2.5″1.3″

Snowfall

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

The snowy period of the year lasts for 6.1 months, from October 25 to April 29, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Saint Johnsbury is February, with an average snowfall of 12.6 inches.

The snowless period of the year lasts for 5.9 months, from April 29 to October 25. The least snow falls around July 21, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Saint Johnsbury

Average Monthly Snowfall in Saint JohnsburysnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 inFeb 213.0 inFeb 213.0 inJul 210.0 inJul 210.0 inDec 2012.5 inDec 2012.5 inOct 251.0 inOct 251.0 inApr 291.0 inApr 291.0 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 12.1″12.6″9.2″2.7″0.1″0.0″0.0″0.0″0.0″0.4″4.7″12.3″

The length of the day in Saint Johnsbury varies significantly over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 50 minutes of daylight; the longest day is June 20, with 15 hours, 33 minutes of daylight.

Hours of Daylight and Twilight in Saint Johnsbury

Hours of Daylight and Twilight in Saint JohnsburyJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 1912 hr, 8 minMar 1915 hr, 33 minJun 2015 hr, 33 minJun 2012 hr, 12 minSep 2212 hr, 12 minSep 228 hr, 50 minDec 218 hr, 50 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 9.3h10.5h12.0h13.5h14.8h15.5h15.1h14.0h12.5h10.9h9.6h8.9h

The earliest sunrise is at 5:02 AM on June 14, and the latest sunrise is 2 hours, 24 minutes later at 7:27 AM on November 2. The earliest sunset is at 4:08 PM on December 9, and the latest sunset is 4 hours, 28 minutes later at 8:36 PM on June 26.

Daylight saving time (DST) is observed in Saint Johnsbury 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 Saint Johnsbury

Sunrise & Sunset with Twilight and Daylight Saving Time in Saint JohnsburyJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 145:02 AMJun 145:02 AM8:36 PMJun 268:36 PMJun 26Dec 94:08 PMDec 94:08 PM7:27 AMNov 27:27 AMNov 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 Saint Johnsbury

Solar Elevation and Azimuth in Saint JohnsburyJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM000101010102020203030304040506000010101020202020303040405050602269NowNow
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 Saint Johnsbury

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.

Saint Johnsbury experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.1 months, from June 11 to September 14, during which time the comfort level is muggy, oppressive, or miserable at least 4% of the time. The month with the most muggy days in Saint Johnsbury is July, with 4.1 days that are muggy or worse.

The least muggy day of the year is February 7, when muggy conditions are essentially unheard of.

Humidity Comfort Levels in Saint Johnsbury

Humidity Comfort Levels in Saint JohnsburymuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 70%Feb 70%Jul 2815%Jul 2815%Jun 114%Jun 114%Sep 144%Sep 144%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 0.0d0.0d0.0d0.0d0.1d1.5d4.1d3.1d1.0d0.1d0.0d0.0d

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 Saint Johnsbury experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.3 months, from November 16 to April 26, with average wind speeds of more than 5.3 miles per hour. The windiest month of the year in Saint Johnsbury is February, with an average hourly wind speed of 7.0 miles per hour.

The calmer time of year lasts for 6.7 months, from April 26 to November 16. The calmest month of the year in Saint Johnsbury is August, with an average hourly wind speed of 3.6 miles per hour.

Average Wind Speed in Saint Johnsbury

Average Wind Speed in Saint JohnsburywindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mph9 mph9 mph10 mph10 mph11 mph11 mphFeb 237.0 mphFeb 237.0 mphAug 43.5 mphAug 43.5 mphNov 165.3 mphNov 165.3 mphApr 265.3 mphApr 265.3 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) 6.67.06.65.74.64.03.73.64.04.65.35.9

The predominant average hourly wind direction in Saint Johnsbury is from the west throughout the year.

Wind Direction in Saint Johnsbury

Wind Direction in Saint JohnsburyJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
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).

To characterize how pleasant the weather is in Saint Johnsbury 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 Saint Johnsbury for general outdoor tourist activities is from late June to late August, with a peak score in the third week of July.

Tourism Score in Saint Johnsbury

Tourism Score in Saint Johnsburybest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.16.10.00.0NowNowtemperaturetemperature 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 Saint Johnsbury for hot-weather activities is from early July to mid August, with a peak score in the third week of July.

Beach/Pool Score in Saint Johnsbury

Beach/Pool Score in Saint JohnsburyJanFebMarAprMayJunJulAugSepOctNovDec002244668810103.73.70.00.0NowNowtemperaturetemperature 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 Saint Johnsbury typically lasts for 4.5 months (138 days), from around May 14 to around September 29, rarely starting before April 28 or after May 30, and rarely ending before September 13 or after October 16.

Time Spent in Various Temperature Bands and the Growing Season in Saint Johnsbury

Time Spent in Various Temperature Bands and the Growing Season in Saint Johnsburygrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 1450%May 1450%Sep 2950%Sep 2950%May 3090%May 3090%Sep 1390%Sep 1390%Apr 2810%Apr 2810%Oct 1610%Oct 1610%0%Feb 210%Feb 21Jul 24100%Jul 24100%NowNowfrigidfreezingcoolcomfortablecoldwarmvery cold
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 Saint Johnsbury should appear around May 3, only rarely appearing before April 22 or after May 14.

Growing Degree Days in Saint Johnsbury

Growing Degree Days in Saint JohnsburyJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°FMay 390°FMay 390°FJul 13900°FJul 13900°FSep 131,800°FSep 131,800°FDec 312,005°FDec 312,005°F
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 6 to August 22, with an average daily incident shortwave energy per square meter above 5.6 kWh. The brightest month of the year in Saint Johnsbury is July, with an average of 6.4 kWh.

The darker period of the year lasts for 3.5 months, from October 29 to February 12, with an average daily incident shortwave energy per square meter below 2.3 kWh. The darkest month of the year in Saint Johnsbury is December, with an average of 1.3 kWh.

Average Daily Incident Shortwave Solar Energy in Saint Johnsbury

Average Daily Incident Shortwave Solar Energy in Saint JohnsburybrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 306.6 kWhJun 306.6 kWhDec 161.2 kWhDec 161.2 kWhMay 65.6 kWhMay 65.6 kWhAug 225.6 kWhAug 225.6 kWhOct 292.3 kWhOct 292.3 kWhFeb 122.3 kWhFeb 122.3 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) 1.62.43.64.95.86.46.45.74.52.91.71.3

For the purposes of this report, the geographical coordinates of Saint Johnsbury are 44.419 deg latitude, -72.015 deg longitude, and 577 ft elevation.

The topography within 2 miles of Saint Johnsbury contains very significant variations in elevation, with a maximum elevation change of 886 feet and an average elevation above sea level of 857 feet. Within 10 miles contains very significant variations in elevation (2,290 feet). Within 50 miles contains large variations in elevation (6,001 feet).

The area within 2 miles of Saint Johnsbury is covered by trees (72%) and artificial surfaces (22%), within 10 miles by trees (86%), and within 50 miles by trees (92%).

This report illustrates the typical weather in Saint Johnsbury, 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 Saint Johnsbury.

For each station, the records are corrected for the elevation difference between that station and Saint Johnsbury 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 Saint Johnsbury is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Saint Johnsbury 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 Saint Johnsbury 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.