Ann Arbor Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Ann Arbor, Michigan during each month of the year.

The average high and low temperatures are listed below monthly and annually for the city, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 70, 80 or 90 °F each month in Ann Arbor, scroll down farther. There are also monthly and yearly counts of days with cold weather.

The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1991 to 2020 weather.

10-year temperature averages for Ann Arbor, 2010 to 2019
High °F Low °F   High °C Low °C
32 18 January 0 -8
35 19 February 2 -7
47 27 March 8 -3
60 37 April 15 3
73 50 May 23 10
80 59 June 27 15
85 63 July 30 17
82 61 August 28 16
76 55 September 24 13
63 44 October 17 6
48 32 November 9 0
37 25 December 3 -4
60 41 Year 15 5
30-year temperature averages for Ann Arbor, 1991 to 2020
High °F Low °F   High °C Low °C
32 16 January 0 -9
35 18 February 2 -8
46 25 March 8 -4
60 36 April 15 2
71 47 May 22 8
80 56 June 27 13
84 60 July 29 16
82 59 August 28 15
75 52 September 24 11
62 41 October 17 5
48 31 November 9 -1
36 22 December 2 -6
59 38 Year 15 4

Days of Hot Weather in Ann Arbor

From May until September, Ann Arbor sees the occasional day of 90-degree Fahrenheit temperatures. But most summer days stay in the 80s. Highs above 100 °F (38 °C) are not expected here.

Number of days in Ann Arbor of at least 70, 80 or 90 °F
  70 °F
21 °C
80 °F
27 °C
90 °F
32 °C
January 0 0 0
February 0 0 0
March 1 0 0
April 6 1 0
May 18 7 0
June 28 16 3
July 31 24 6
August 30 21 2
September 22 10 1
October 8 1 0
November 1 0 0
December 0 0 0
Year 145 81 12

How Often Ann Arbor Has Cold Temperatures

Freezing temperatures at Ann Arbor can occur from October until May. The city averages 130 frosty nights annually, including most nights from December until March. On four of those winter nights, the thermometer drops to 0 °F (-18 °C) or below.

Typically on 45 days a year the temperature never rises above freezing. Days that chilly can occur from November to April.

Days per month on average in Ann Arbor when the minimum temperature drops to 32, 20 or 10 °F or below
  10 °F
-12 °C
20 °F
-8 °C
32 °F
0 °C
January 8 17 28
February 6 13 25
March 2 7 22
April 0 1 9
May 0 0 1
June 0 0 0
July 0 0 0
August 0 0 0
September 0 0 0
October 0 0 4
November 0 3 16
December 3 10 26
Year 18 50 130
References

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Michigan Temperatures
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