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Ann Arbor, Michigan climate
Dfa Hot-summer humid continental
Ann Arbor has a strongly seasonal cool-temperate climate (Hot-summer humid continental, Köppen Dfa). The hottest month is July with an average daily high near 84°F, while the coldest is January averaging around 19°F at night. Precipitation is fairly even year-round, totalling about 33 inches. Winters bring significant snowfall (27 inches of snow per year on average).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Ann Arbor climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 32 | 36 | 46 | 58 | 70 | 80 | 84 | 82 | 75 | 62 | 48 | 37 |
| Avg temp (°F) | 26 | 29 | 37 | 48 | 60 | 70 | 74 | 73 | 66 | 54 | 41 | 31 |
| Avg low (°F) | 19 | 21 | 28 | 38 | 50 | 60 | 65 | 63 | 56 | 45 | 34 | 25 |
| Precipitation (in) | 2.7 | — | 2.6 | 3.5 | 3.6 | 3.2 | 3.0 | 3.2 | 3.2 | 3.0 | 3.0 | 2.3 |
| Snowfall (in) | 10.9 | — | 6.2 | 1.2 | — | — | — | — | — | 0.0 | 1.8 | 6.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 32 | 36 | 46 | 58 | 70 | 80 |
| Avg temp (°F) | 26 | 29 | 37 | 48 | 60 | 70 |
| Avg low (°F) | 19 | 21 | 28 | 38 | 50 | 60 |
| Precipitation (in) | 2.7 | — | 2.6 | 3.5 | 3.6 | 3.2 |
| Snowfall (in) | 10.9 | — | 6.2 | 1.2 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 84 | 82 | 75 | 62 | 48 | 37 |
| Avg temp (°F) | 74 | 73 | 66 | 54 | 41 | 31 |
| Avg low (°F) | 65 | 63 | 56 | 45 | 34 | 25 |
| Precipitation (in) | 3.0 | 3.2 | 3.2 | 3.0 | 3.0 | 2.3 |
| Snowfall (in) | — | — | — | 0.0 | 1.8 | 6.6 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 70 | 70 | 67 | 65 | 59 | 53 | 54 | 53 | 64 | 70 | 74 |
| Relative humidity (%) | 87 | 85 | 80 | 78 | 78 | 77 | 74 | 73 | 74 | 77 | 81 | 86 |
| Wind speed (mph) | 10.8 | 10.0 | 9.4 | 9.1 | 7.7 | 6.9 | 6.6 | 6.6 | 7.6 | 9.2 | 10.1 | 10.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 70 | 70 | 67 | 65 | 59 |
| Relative humidity (%) | 87 | 85 | 80 | 78 | 78 | 77 |
| Wind speed (mph) | 10.8 | 10.0 | 9.4 | 9.1 | 7.7 | 6.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 53 | 54 | 53 | 64 | 70 | 74 |
| Relative humidity (%) | 74 | 73 | 74 | 77 | 81 | 86 |
| Wind speed (mph) | 6.6 | 6.6 | 7.6 | 9.2 | 10.1 | 10.3 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 25 years of daily observations at Amherstburg, a weather station, about 57 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.