Average Weather in Detroit Michigan, United States
In Detroit, the temperature typically varies from 20°F to 83°F over the course of the year, and is rarely below 6°F or above 91°F.
The warm season lasts for 115 days, from May 26 to September 18, with an average daily high temperature above 72°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 100 days, from December 1 to March 11, 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 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
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
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 7, and the latest sunset is 4 hours, 13 minutes later at 9:13 PM on June 27.
Daylight saving time (DST) is observed in Detroit during 2017, starting in the spring on March 12, lasting 237 days, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
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 1 and lasts for 156 days, 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 209 days, ending around June 1. 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.
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 193 days, from March 28 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 172 days, from October 7 to March 28. 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 353 days, 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 12 days, from January 26 to February 7. The highest chance of a day with snow alone is 7% on February 11.
Daily Chance of Precipitation
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 in 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 and average total accumulation of 0.7 inches.
Average Monthly Rainfall
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 in the year. Detroit experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 133 days, from November 25 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 232 days, from April 7 to November 25. The least snow falls around July 20, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
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 111 days, from June 2 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
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 mildly seasonal variation over the course of the year.
The windier part of the year lasts for 215 days, from October 4 to May 7, with average wind speeds of more than 5.8 miles per hour. The windiest day of the year is January 12, with an average hourly wind speed of 7.4 miles per hour.
The calmer time of year lasts for 150 days, from May 7 to October 4. The calmest day of the year is August 4, with an average hourly wind speed of 4.4 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Detroit varies throughout the year.
The wind is most often from the south for 35 days, from August 17 to September 21, with a peak percentage of 31% on September 14. The wind is most often from the west for 330 days, from September 21 to August 17, with a peak percentage of 48% on December 13.
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 very significant seasonal variation over the course of the year.
The time of year with warmer water lasts for 96 days, from June 21 to September 25, 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 130 days, from December 8 to April 17, with an average temperature below 42°F. The day of the year with the coolest water is February 13, with an average temperature of 33°F.
Average Water Temperature
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 very significant seasonal variation over the course of the year.
The brighter period of the year lasts for 112 days, from May 2 to August 22, with an average daily incident shortwave energy per square meter above 5.8 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 103 days, from November 2 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
For the purposes of this report, the geographical coordinates of Detroit are 42.331 deg latitude, -83.046 deg longitude, and 600 ft elevation (map ).
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 contains only modest variations in elevation (105 feet). Within 50 miles contains significant 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%).
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).
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 .