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Average Weather in Detroit Michigan, United States

In Detroit, the summers are warm, the winters are freezing and windy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 20°F to 83°F and is rarely below 6°F or above 91°F.

Climate Summary

very coldcoldcoolwarmcoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDec68%68%37%37%clearovercastprecipitation: 2.7 inprecipitation: 2.7 in1.2 in1.2 inmuggy: 37%muggy: 37%0%0%drydrytourism score: 7.0tourism score: 7.00.00.0
Click on each chart for more information.

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

Temperature

The warm season lasts for 3.7 months, from May 27 to September 17, with an average daily high temperature above 73°F. The hottest day of the year is July 19, with an average high of 83°F and low of 67°F.

The cold season lasts for 3.3 months, from December 1 to March 10, with an average daily high temperature below 42°F. The coldest day of the year is January 29, with an average low of 20°F and high of 31°F.

Average High and Low Temperature

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.

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

Average Hourly Temperature in DetroitJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfreezingcoldcoldcoolcoolcomfortablewarmvery coldvery coldfreezing
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.

Odessa, Ukraine (5,088 miles away); Damāvand, Iran (6,353 miles); and Kakunodatemachi, Japan (6,159 miles) are the far-away foreign places with temperatures most similar to Detroit (view comparison).

Clouds

In Detroit, 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 Detroit begins around June 2 and lasts for 5.0 months, ending around November 4. On August 10, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 68% of the time, and overcast or mostly cloudy 32% of the time.

The cloudier part of the year begins around November 4 and lasts for 7.0 months, ending around June 2. On January 10, the cloudiest day of the year, the sky is overcast or mostly cloudy 63% of the time, and clear, mostly clear, or partly cloudy 37% of the time.

Cloud Cover Categories

Cloud Cover Categories in DetroitclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 1068%Aug 1068%Jan 1037%Jan 1037%Jun 252%Jun 252%Nov 452%Nov 452%clearmostly clearpartly cloudymostly cloudyovercast
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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

The wetter season lasts 6.4 months, from March 27 to October 7, with a greater than 26% chance of a given day being a wet day. The chance of a wet day peaks at 36% on June 13.

The drier season lasts 5.6 months, from October 7 to March 27. The smallest chance of a wet day is 16% on February 3.

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 Detroit changes throughout the year.

Rain alone is the most common for 12 months, from February 7 to January 26. The highest chance of a day with rain alone is 36% on June 13.

Snow alone is the most common for 1.7 weeks, from January 26 to February 7. The highest chance of a day with snow alone is 7% on February 11.

Daily Chance of Precipitation

Daily Chance of Precipitation in DetroitrainrainJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jun 1336%Jun 1336%Feb 316%Feb 316%Jan 122%Jan 122%Mar 2726%Mar 2726%Oct 726%Oct 726%snowrainmixed
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).

Rainfall

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. Detroit experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Detroit. The most rain falls during the 31 days centered around June 2, with an average total accumulation of 2.7 inches.

The least rain falls around January 29, with an average total accumulation of 0.7 inches.

Average Monthly Rainfall

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 liquid-equivalent snowfall.

Snowfall

We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

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

The snowy period of the year lasts for 4.4 months, from November 24 to April 7, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around February 14, with an average total liquid-equivalent accumulation of 0.5 inches.

The snowless period of the year lasts for 7.6 months, from April 7 to November 24. The least snow falls around July 20, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall in DetroitsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 in2.5 in3.0 inFeb 140.5 inFeb 140.5 inJul 200.0 inJul 200.0 inNov 240.1 inNov 240.1 inApr 70.1 inApr 70.1 in
The average liquid-equivalent 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.

Sun

The length of the day in Detroit varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 5 minutes of daylight; the longest day is June 21, with 15 hours, 17 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in DetroitJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2015 hr, 17 minJun 2115 hr, 17 minJun 2112 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 5 minDec 219 hr, 5 minDec 21nightnightday
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.

The earliest sunrise is at 5:54 AM on June 14, and the latest sunrise is 2 hours, 15 minutes later at 8:09 AM on November 4. The earliest sunset is at 4:59 PM on December 8, and the latest sunset is 4 hours, 13 minutes later at 9:13 PM on June 26.

Daylight saving time (DST) is observed in Detroit during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in DetroitJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 145:54 AMJun 145:54 AM9:13 PMJun 269:13 PMJun 26Dec 84:59 PMDec 84:59 PM8:09 AMNov 48:09 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2017. 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.

Humidity

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.

Detroit experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.6 months, from June 1 to September 21, during which time the comfort level is muggy, oppressive, or miserable at least 9% of the time. The muggiest day of the year is August 1, with muggy conditions 37% of the time.

The least muggy day of the year is December 9, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in DetroitmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Dec 90%Dec 90%Aug 137%Aug 137%Jun 19%Jun 19%Sep 219%Sep 219%muggymuggydrydrycomfortablecomfortablehumidhumidoppressiveoppressive
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Detroit experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 7.0 months, from October 5 to May 7, with average wind speeds of more than 10.9 miles per hour. The windiest day of the year is January 12, with an average hourly wind speed of 13.6 miles per hour.

The calmer time of year lasts for 5.0 months, from May 7 to October 5. The calmest day of the year is August 4, with an average hourly wind speed of 8.1 miles per hour.

Average Wind Speed

Average Wind Speed in DetroitwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mph20 mphJan 1213.6 mphJan 1213.6 mphAug 48.1 mphAug 48.1 mphOct 510.9 mphOct 510.9 mphMay 710.9 mphMay 710.9 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

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

The wind is most often from the south for 1.1 months, from August 17 to September 21, with a peak percentage of 31% on September 14. The wind is most often from the west for 11 months, from September 21 to August 17, with a peak percentage of 47% on January 1.

Wind Direction

Wind Direction in DetroitWSWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsoutheastnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Detroit 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 extreme seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.1 months, from June 22 to September 24, with an average temperature above 66°F. The day of the year with the warmest water is August 3, with an average temperature of 74°F.

The time of year with cooler water lasts for 4.3 months, from December 8 to April 16, with an average temperature below 41°F. The day of the year with the coolest water is February 13, with an average temperature of 33°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Detroit 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 Detroit for general outdoor tourist activities is from mid June to mid September, with a peak score in the third week of August.

Tourism Score

Tourism Score in Detroitbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.07.00.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturetourism 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 Detroit for hot-weather activities is from early July to mid August, with a peak score in the third week of July.

Beach/Pool Score

Beach/Pool Score in Detroitbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468105.85.80.00.0precipitationprecipitationcloudscloudstemperaturetemperaturebeach/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.

Growing Season

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 Detroit typically lasts for 6.6 months (200 days), from around April 15 to around November 2, rarely starting before March 31 or after May 1, and rarely ending before October 14 or after November 20.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Detroitgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 1550%Apr 1550%Nov 250%Nov 290%May 190%May 190%Oct 1490%Oct 1410%Mar 3110%Mar 3110%Nov 2010%Nov 200%Feb 50%Feb 5Jul 20100%Jul 20100%freezingvery coldcoolcomfortablewarmcoldhot
The percentage of time spent in various temperature bands: 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 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 Detroit should appear around April 19, only rarely appearing before April 5 or after May 2.

Growing Degree Days

The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 3.6 months, from May 3 to August 22, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is July 1, with an average of 7.0 kWh.

The darker period of the year lasts for 3.4 months, from November 3 to February 13, with an average daily incident shortwave energy per square meter below 2.6 kWh. The darkest day of the year is December 20, with an average of 1.5 kWh.

Average Daily Incident Shortwave Solar Energy

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Detroit are 42.331 deg latitude, -83.046 deg longitude, and 600 ft elevation.

The topography within 2 miles of Detroit is essentially flat, with a maximum elevation change of 62 feet and an average elevation above sea level of 596 feet. Within 10 miles is essentially flat (105 feet). Within 50 miles contains only modest variations in elevation (797 feet).

The area within 2 miles of Detroit is covered by artificial surfaces (83%) and water (15%), within 10 miles by artificial surfaces (69%), and within 50 miles by cropland (32%) and water (26%).

Data Sources

This report illustrates the typical weather in Detroit, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Detroit.

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

The stations contributing to this reconstruction are: Detroit City Airport (43%, 9 kilometers, north); Windsor Airport (40%, 10 kilometers, southeast); Detroit Metropolitan Wayne County Airport (9%, 26 kilometers, southwest); and Grosse Ile Municipal Airport (8%, 28 kilometers, south).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.