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Ann Arbor, MI Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Ann Arbor, MI?
Ann Arbor, MI gets 37.9 in of precipitation a year over about 163 rainy days, and about 59.3 in of snow a season. July is the warmest month (average high 84°F) and February the coldest (average low 16°F).
Humid continental climate
Ann Arbor, MI has hot summers and cold winters. Daytime highs range from about 32°F in January to 84°F in July. June is usually the wettest month, and snow falls in winter. The most comfortable time to visit is typically May and September to October, when daytime highs sit near 70°F.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 18° | 34° |
| Spring | Mar–May | 35° | 58° |
| Summer | Jun–Aug | 58° | 82° |
| Autumn | Sep–Nov | 40° | 62° |
How much rain does Ann Arbor get?
Ann Arbor gets 37.9 in of precipitation in an average year, spread over about 163 days with measurable rain. That is more rainy days than 97% of the US.
June is the wettest month, with 4.3 in. February is the driest, with 2.4 in. January has the most rainy days, about 18.
The longest dry spell in the last five years lasted 22 days, to June 11, 2023.
From September 2025 to August 2026 Ann Arbor got 31.3 in of rain, against a normal of 37.9 in for those months. April 2026 had the most, with 5.1 in.
See where Ann Arbor ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in Michigan.
Does it snow in Ann Arbor?
Yes. Ann Arbor gets about 59.3 in of snow in an average season, measured at the reporting station.
The snowiest winter on record is 2013–14, with 95.1 in.
The most recent measurable snow at the station fell on April 6, 2026.
From September 2025 to August 2026 the station measured 39.5 in of snow, against a normal of 59.3 in for those months. January 2026 had the most, with 17.1 in.
See where Ann Arbor ranks: snowiest cities in the US.
Ann Arbor weather by month
Ann Arbor weather in January
In January, Ann Arbor averages a high of 32°F and a low of 17°F. It gets 2.8 in of precipitation over about 18 rainy days. Estimated sunshine is 20% of daylight hours, derived from ERA5 cloud cover. The January record high is 63°F (2008) and the record low is -18°F (2019).
Ann Arbor weather in February
In February, Ann Arbor averages a high of 34°F and a low of 16°F. It gets 2.4 in of precipitation over about 15 rainy days. Estimated sunshine is 34% of daylight hours, derived from ERA5 cloud cover. The February record high is 73°F (2024) and the record low is -18°F (2015).
Ann Arbor weather in March
In March, Ann Arbor averages a high of 46°F and a low of 25°F. It gets 2.8 in of precipitation over about 14 rainy days. Estimated sunshine is 33% of daylight hours, derived from ERA5 cloud cover. The March record high is 87°F (2012) and the record low is -10°F (2014).
Ann Arbor weather in April
In April, Ann Arbor averages a high of 59°F and a low of 35°F. It gets 3.3 in of precipitation over about 14 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The April record high is 85°F (2004) and the record low is 14°F (2016).
Ann Arbor weather in May
In May, Ann Arbor averages a high of 70°F and a low of 46°F. It gets 3.8 in of precipitation over about 15 rainy days. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. The May record high is 95°F (2006) and the record low is 25°F (2005). May is one of the most comfortable months to visit.
Ann Arbor weather in June
In June, Ann Arbor averages a high of 80°F and a low of 56°F. It gets 4.3 in of precipitation over about 12 rainy days. Estimated sunshine is 47% of daylight hours, derived from ERA5 cloud cover. The June record high is 99°F (2012) and the record low is 37°F (2003).
Ann Arbor weather in July
In July, Ann Arbor averages a high of 84°F and a low of 60°F. It gets 3.9 in of precipitation over about 11 rainy days. Estimated sunshine is 48% of daylight hours, derived from ERA5 cloud cover. The July record high is 100°F (2012) and the record low is 43°F (2007).
Ann Arbor weather in August
In August, Ann Arbor averages a high of 82°F and a low of 58°F. It gets 3.3 in of precipitation over about 11 rainy days. Estimated sunshine is 49% of daylight hours, derived from ERA5 cloud cover. The August record high is 98°F (2012) and the record low is 42°F (2025).
Ann Arbor weather in September
In September, Ann Arbor averages a high of 76°F and a low of 51°F. It gets 3.0 in of precipitation over about 11 rainy days. Estimated sunshine is 50% of daylight hours, derived from ERA5 cloud cover. The September record high is 95°F (2011) and the record low is 32°F (2020). September is one of the most comfortable months to visit.
Ann Arbor weather in October
In October, Ann Arbor averages a high of 62°F and a low of 40°F. It gets 2.9 in of precipitation over about 14 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The October record high is 90°F (2007) and the record low is 22°F (2008). October is one of the most comfortable months to visit.
Ann Arbor weather in November
In November, Ann Arbor averages a high of 49°F and a low of 30°F. It gets 2.7 in of precipitation over about 12 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The November record high is 78°F (2015) and the record low is 3°F (2019).
Ann Arbor weather in December
In December, Ann Arbor averages a high of 37°F and a low of 23°F. It gets 2.6 in of precipitation over about 17 rainy days. Estimated sunshine is 19% of daylight hours, derived from ERA5 cloud cover. The December record high is 63°F (2023) and the record low is -10°F (2017).
Sunshine, humidity and wind in Ann Arbor
September is the sunniest month in Ann Arbor, with estimated sunshine of 50% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 19%. The annual cloud-cover estimate is 38% of daylight hours; it is not a measurement of sunshine duration. Ann Arbor is cloudier than 92% of the US.
Humidity peaks in January at 76% and is lowest in May at 59%.
Ann Arbor has about 12 days a year above 90°F. Ann Arbor is cooler than 74% of the US.
Thunderstorms occur on about 39 days a year.
See where Ann Arbor ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
First and last freeze in Ann Arbor
The first fall freeze in Ann Arbor typically comes around October 15, and the last spring freeze around May 6. That leaves a frost-free growing season of about 162 days.
Ann Arbor weather records
These records cover ANN ARBOR SE during 2003–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Ann Arbor station is 100°F, on July 5, 2012. The coldest is -18°F, on February 20, 2015.
The wettest day in the available station history brought 5.3 in of precipitation, on June 26, 2021.
The best time to visit Ann Arbor
The most comfortable time to visit is typically May and September to October, when daytime highs sit near 70°F.
Winter (December–February) is cold, with average highs around 34°F and lows near 18°F. Snow is possible.
Spring (March–May) is mild, with average highs around 58°F and lows near 35°F.
Summer (June–August) is hot, with average highs around 82°F and lows near 58°F.
Autumn (September–November) is mild, with average highs around 62°F and lows near 40°F.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 17° | 32° | 2.8 in | 18 | 76% | 20% | 63° | -18° |
| February | 16° | 34° | 2.4 in | 15 | 69% | 34% | 73° | -18° |
| March | 25° | 46° | 2.8 in | 14 | 63% | 33% | 87° | -10° |
| April | 35° | 59° | 3.3 in | 14 | 60% | 36% | 85° | 14° |
| May | 46° | 70° | 3.8 in | 15 | 59% | 38% | 95° | 25° |
| June | 56° | 80° | 4.3 in | 12 | 60% | 47% | 99° | 37° |
| July | 60° | 84° | 3.9 in | 11 | 69% | 48% | 100° | 43° |
| August | 58° | 82° | 3.3 in | 11 | 70% | 49% | 98° | 42° |
| September | 51° | 76° | 3.0 in | 11 | 71% | 50% | 95° | 32° |
| October | 40° | 62° | 2.9 in | 14 | 69% | 42% | 90° | 22° |
| November | 30° | 49° | 2.7 in | 12 | 68% | 40% | 78° | 3° |
| December | 23° | 37° | 2.6 in | 17 | 74% | 19% | 63° | -10° |
Station: ANN ARBOR SE, 6 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 2003–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Ann Arbor climate questions
How much rain does Ann Arbor get?
Ann Arbor gets 37.9 in of precipitation in an average year, over about 163 rainy days.
What is the wettest month in Ann Arbor?
June is the wettest month in Ann Arbor, with 4.3 in. February is the driest, with 2.4 in.
How many rainy days does Ann Arbor have a year?
Ann Arbor has about 163 days with measurable rain in an average year. January has the most, about 18.
Does it snow in Ann Arbor?
Yes. Ann Arbor gets about 59.3 in of snow in an average season. The snowiest winter on record is 2013–14, with 95.1 in.
What is the hottest month in Ann Arbor?
July is the warmest month in Ann Arbor, with an average high of 84°F.
What is the coldest month in Ann Arbor?
February is the coldest month in Ann Arbor, with an average low of 16°F.
What is the record high temperature in Ann Arbor?
Within the available 2003–2026 station history, the record high at the Ann Arbor station is 100°F, set on July 5, 2012. The record low is -18°F, on February 20, 2015.
What is the sunniest month in Ann Arbor?
September is the sunniest month in Ann Arbor, with estimated sunshine of 50% of daylight hours from ERA5 cloud cover. December is the cloudiest.
When is the first frost in Ann Arbor?
The first fall freeze in Ann Arbor typically comes around October 15. The last spring freeze is around May 6.
What is the best time to visit Ann Arbor?
The most comfortable time to visit is typically May and September to October, when daytime highs sit near 70°F.