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Climate and Average Weather Year Round at Brooks Field Michigan, United States

At Brooks Field, the summers are warm; 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 17°F to 83°F and is rarely below -0°F or above 91°F.

Based on the tourism score, the best time of year to visit Brooks Field for warm-weather activities is from mid June to early September.

Climate at Brooks Field

freezingvery coldcoldcoolwarmcoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDecNowNow68%68%32%32%clearovercastprecipitation: 3.3 inprecipitation: 3.3 in1.2 in1.2 inmuggy: 40%muggy: 40%0%0%drydrytourism score: 6.6tourism score: 6.60.00.0
Brooks Field weather by month. Click on each chart for more information.

The warm season lasts for 3.8 months, from May 24 to September 16, with an average daily high temperature above 72°F. The hottest month of the year at Brooks Field is July, with an average high of 82°F and low of 62°F.

The cold season lasts for 3.3 months, from November 30 to March 6, with an average daily high temperature below 41°F. The coldest month of the year at Brooks Field is January, with an average low of 18°F and high of 31°F.

Average High and Low Temperature at Brooks Field

Average High and Low Temperature at Brooks FieldwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2931°FJan 2931°FJul 1883°FJul 1883°F17°F17°F63°F63°FMay 2472°FMay 2472°FSep 1672°FSep 1672°FNov 3041°FNov 3041°FMar 641°FMar 641°F52°F52°F53°F53°F29°F29°F25°F25°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 31°F34°F46°F59°F70°F79°F82°F80°F72°F60°F48°F36°F
Temp. 24°F26°F36°F48°F59°F69°F72°F70°F63°F51°F40°F29°F
Low 18°F20°F28°F39°F49°F59°F62°F61°F53°F42°F33°F24°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 at Brooks Field

Average Hourly Temperature at Brooks FieldJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowfreezingvery coldcoldcoldcoolcomfortablecomfortablewarmfreezingvery 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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Dnipro, Ukraine (5,192 miles away) and Aleksandrovskoye, Russia (5,630 miles) are the far-away foreign places with temperatures most similar to Brooks Field (view comparison).

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At Brooks Field, 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 at Brooks Field begins around May 21 and lasts for 5.4 months, ending around November 2.

The clearest month of the year at Brooks Field is August, during which on average the sky is clear, mostly clear, or partly cloudy 67% of the time.

The cloudier part of the year begins around November 2 and lasts for 6.6 months, ending around May 21.

The cloudiest month of the year at Brooks Field is January, during which on average the sky is overcast or mostly cloudy 67% of the time.

Cloud Cover Categories at Brooks Field

Cloud Cover Categories at Brooks FieldclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 2568%Aug 2568%Jan 832%Jan 832%May 2150%May 2150%Nov 250%Nov 250%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 67%63%56%53%51%43%36%33%35%43%55%65%
Clearer 33%37%44%47%49%57%64%67%65%57%45%35%

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

The wetter season lasts 6.6 months, from March 28 to October 17, with a greater than 26% chance of a given day being a wet day. The month with the most wet days at Brooks Field is June, with an average of 10.4 days with at least 0.04 inches of precipitation.

The drier season lasts 5.4 months, from October 17 to March 28. The month with the fewest wet days at Brooks Field is February, with an average of 5.1 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 at Brooks Field changes throughout the year.

Rain alone is the most common for 11 months, from February 5 to January 15. The month with the most days of rain alone at Brooks Field is June, with an average of 10.4 days.

Snow alone is the most common for 3.0 weeks, from January 15 to February 5. The month with the most days of snow alone at Brooks Field is January, with an average of 2.3 days.

Daily Chance of Precipitation at Brooks Field

Daily Chance of Precipitation at Brooks FieldrainJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jun 1236%Jun 1236%Jan 2915%Jan 2915%Mar 2826%Mar 2826%Oct 1726%Oct 1726%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 2.4d2.3d4.9d8.4d10.2d10.4d10.7d10.6d9.4d7.9d5.8d3.9d
Mixed 1.0d1.0d1.1d0.4d0.0d0.0d0.0d0.0d0.0d0.1d0.7d1.3d
Snow 2.3d1.8d1.1d0.2d0.0d0.0d0.0d0.0d0.0d0.0d0.4d1.7d
Any 5.7d5.1d7.0d9.0d10.2d10.4d10.7d10.6d9.4d8.1d6.9d6.9d

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. Brooks Field experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year at Brooks Field. The month with the most rain at Brooks Field is June, with an average rainfall of 3.2 inches.

The month with the least rain at Brooks Field is January, with an average rainfall of 0.8 inches.

Average Monthly Rainfall at Brooks Field

Average Monthly Rainfall at Brooks FieldJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 inMay 313.3 inMay 313.3 inJan 290.7 inJan 290.7 inAug 33.2 inAug 33.2 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″0.8″1.5″2.6″3.1″3.2″3.0″3.1″3.0″2.6″2.1″1.2″

Snowfall

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

The snowy period of the year lasts for 4.8 months, from November 14 to April 8, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Brooks Field is February, with an average snowfall of 5.1 inches.

The snowless period of the year lasts for 7.2 months, from April 8 to November 14. The least snow falls around July 18, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall at Brooks Field

Average Monthly Snowfall at Brooks FieldsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 inJan 45.3 inJan 45.3 inJul 180.0 inJul 180.0 inFeb 215.1 inFeb 215.1 inNov 141.0 inNov 141.0 inApr 81.0 inApr 81.0 in
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 5.0″5.1″3.3″0.6″0.0″0.0″0.0″0.0″0.0″0.1″1.1″4.6″

The length of the day at Brooks Field varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 5 minutes of daylight; the longest day is June 20, with 15 hours, 16 minutes of daylight.

Hours of Daylight and Twilight at Brooks Field

Hours of Daylight and Twilight at Brooks FieldJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 1912 hr, 8 minMar 1915 hr, 16 minJun 2015 hr, 16 minJun 2012 hr, 11 minSep 2212 hr, 11 minSep 229 hr, 5 minDec 219 hr, 5 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 9.5h10.6h12.0h13.4h14.6h15.2h14.9h13.8h12.4h11.0h9.8h9.1h

The earliest sunrise is at 6:02 AM on June 14, and the latest sunrise is 2 hours, 12 minutes later at 8:14 AM on November 2. The earliest sunset is at 5:07 PM on December 8, and the latest sunset is 4 hours, 13 minutes later at 9:20 PM on June 26.

Daylight saving time (DST) is observed at Brooks Field 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 at Brooks Field

Sunrise & Sunset with Twilight and Daylight Saving Time at Brooks FieldJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 146:02 AMJun 146:02 AM9:20 PMJun 269:20 PMJun 26Dec 85:07 PMDec 85:07 PM8:14 AMNov 28:14 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 at Brooks Field

Solar Elevation and Azimuth at Brooks FieldJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM0001010101020202030303040405050606000010101020202020303040405050602471NowNow
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 at Brooks Field

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.

Brooks Field experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.7 months, from May 30 to September 19, during which time the comfort level is muggy, oppressive, or miserable at least 10% of the time. The month with the most muggy days at Brooks Field is July, with 11.5 days that are muggy or worse.

The least muggy day of the year is February 18, when muggy conditions are essentially unheard of.

Humidity Comfort Levels at Brooks Field

Humidity Comfort Levels at Brooks FieldmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 180%Feb 180%Jul 2840%Jul 2840%May 3010%May 3010%Sep 1910%Sep 1910%NowNowoppressiveoppressivemuggymuggycomfortablecomfortabledrydryhumidhumid
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 0.0d0.0d0.0d0.1d1.4d5.9d11.5d10.2d4.0d0.3d0.0d0.0d

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 at Brooks Field experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 7.3 months, from October 7 to May 17, with average wind speeds of more than 10.3 miles per hour. The windiest month of the year at Brooks Field is January, with an average hourly wind speed of 12.7 miles per hour.

The calmer time of year lasts for 4.7 months, from May 17 to October 7. The calmest month of the year at Brooks Field is August, with an average hourly wind speed of 8.0 miles per hour.

Average Wind Speed at Brooks Field

Average Wind Speed at Brooks FieldwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mphJan 1512.9 mphJan 1512.9 mphAug 37.8 mphAug 37.8 mphOct 710.3 mphOct 710.3 mphMay 1710.3 mphMay 1710.3 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) 12.712.512.411.910.49.18.38.09.210.711.712.1

The predominant average hourly wind direction at Brooks Field varies throughout the year.

The wind is most often from the south for 1.3 months, from August 24 to October 2, with a peak percentage of 32% on October 1. The wind is most often from the west for 11 months, from October 2 to August 24, with a peak percentage of 43% on January 1.

Wind Direction at Brooks Field

Wind Direction at Brooks FieldWSWJanFebMarAprMayJunJulAugSepOctNovDec0%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).

To characterize how pleasant the weather is at Brooks Field 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 Brooks Field for general outdoor tourist activities is from mid June to early September, with a peak score in the second week of August.

Tourism Score at Brooks Field

Tourism Score at Brooks Fieldbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.66.60.00.0NowNowtemperaturetemperature 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 Brooks Field for hot-weather activities is from late June to mid August, with a peak score in the third week of July.

Beach/Pool Score at Brooks Field

Beach/Pool Score at Brooks Fieldbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.25.20.00.0NowNowtemperaturetemperaturecloudscloudsprecipitationprecipitationbeach/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 at Brooks Field typically lasts for 5.5 months (167 days), from around April 27 to around October 12, rarely starting before April 10 or after May 16, and rarely ending before September 24 or after October 29.

Time Spent in Various Temperature Bands and the Growing Season at Brooks Field

Time Spent in Various Temperature Bands and the Growing Season at Brooks Fieldgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Apr 2750%Apr 2750%Oct 1250%Oct 1250%May 1690%May 1690%Sep 2490%Sep 2490%Apr 1010%Apr 1010%Oct 2910%Oct 2910%0%Feb 120%Feb 12Jul 20100%Jul 20100%NowNowfrigidfreezingvery coldcoolcomfortablewarmcoldhot
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 at Brooks Field should appear around April 15, only rarely appearing before April 1 or after April 29.

Growing Degree Days at Brooks Field

Growing Degree Days at Brooks FieldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°FApr 1589°FApr 1589°FJun 23900°FJun 23900°FAug 31,800°FAug 31,800°FDec 312,936°FDec 312,936°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 4 to August 20, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest month of the year at Brooks Field is June, with an average of 6.9 kWh.

The darker period of the year lasts for 3.4 months, from November 1 to February 13, with an average daily incident shortwave energy per square meter below 2.5 kWh. The darkest month of the year at Brooks Field is December, with an average of 1.5 kWh.

Average Daily Incident Shortwave Solar Energy at Brooks Field

Average Daily Incident Shortwave Solar Energy at Brooks FieldbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 307.0 kWhJun 307.0 kWhDec 211.4 kWhDec 211.4 kWhMay 45.9 kWhMay 45.9 kWhAug 205.9 kWhAug 205.9 kWhNov 12.5 kWhNov 12.5 kWhFeb 132.5 kWhFeb 132.5 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) 1.72.64.05.26.26.96.86.04.93.32.01.5

For the purposes of this report, the geographical coordinates of Brooks Field are 42.253 deg latitude, -84.960 deg longitude, and 938 ft elevation.

The topography within 2 miles of Brooks Field contains only modest variations in elevation, with a maximum elevation change of 105 feet and an average elevation above sea level of 919 feet. Within 10 miles also contains only modest variations in elevation (213 feet). Within 50 miles contains only modest variations in elevation (656 feet).

The area within 2 miles of Brooks Field is covered by cropland (61%) and artificial surfaces (34%), within 10 miles by cropland (77%) and trees (18%), and within 50 miles by cropland (71%) and trees (20%).

This report illustrates the typical weather at Brooks Field, 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

Brooks Field has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to W K Kellogg Airport; Branch County Memorial Airport; Fitch H Beach Airport; Jackson County Airport; Hillsdale Municipal Airport; Kalamazoo-Battle Creek International Airport; Mason Jewett Field; and Lansing, Capital City Airport.

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.