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Contents
- The climate of Ann Arbor
- The best time to visit Ann Arbor
- The worst time to visit Ann Arbor
- Spring weather in Ann Arbor
- Summer weather in Ann Arbor
- Autumn weather in Ann Arbor
- Winter weather in Ann Arbor
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The vast University of Michigan Law School Campus in Ann Arbor, Michigan
The climate of Ann Arbor
Ann Arbor, Michigan, USA, is located in a geographical zone characterized by a predominant Dfa Köppen classification, which represents a humid continental climate with hot summers and no dry season. The month-to-month shift in the climate of this region provides a rich tapestry of weather variety throughout the year, greatly contributing to the city's seasonal charm.
Temperatures during the rotational year period vary significantly, with the rise and fall in temperature replicating a wave pattern. The warmest periods typically occur from May, averaging at 67.6°F (19.8°C), and extend through September, when the mean temperature is 72.5°F (22.5°C). Sharp drops in temperature are evident from October, as it decreases to 59.2°F (15.1°C), descending through winter to the coldest month of January averaging at 28.2°F (-2.1°C).
Humidity shows slight variability, peaking in January and February as high as 86%, and remaining relatively high for much of the year, with the lowest average in October being 77%. The monthly disparity in cloud coverage ranges from 68% cloud cover in January to low of 29% in July, correlating to the variation in sunshine hours from as high as 15.2 hours in June to as low as 9.1 hours in December.
Precipitation in Ann Arbor, spanning rainfall and snowfall, presents a noteworthy aspect of its climate. The months from March to July witness higher rainfall scales ranging from 2.24" (57mm) up to 2.4" (61mm), while snowfall is dominant from December to February, with the heaviest in January measuring 2.48" (63mm).
Temperatures during the rotational year period vary significantly, with the rise and fall in temperature replicating a wave pattern. The warmest periods typically occur from May, averaging at 67.6°F (19.8°C), and extend through September, when the mean temperature is 72.5°F (22.5°C). Sharp drops in temperature are evident from October, as it decreases to 59.2°F (15.1°C), descending through winter to the coldest month of January averaging at 28.2°F (-2.1°C).
Humidity shows slight variability, peaking in January and February as high as 86%, and remaining relatively high for much of the year, with the lowest average in October being 77%. The monthly disparity in cloud coverage ranges from 68% cloud cover in January to low of 29% in July, correlating to the variation in sunshine hours from as high as 15.2 hours in June to as low as 9.1 hours in December.
Precipitation in Ann Arbor, spanning rainfall and snowfall, presents a noteworthy aspect of its climate. The months from March to July witness higher rainfall scales ranging from 2.24" (57mm) up to 2.4" (61mm), while snowfall is dominant from December to February, with the heaviest in January measuring 2.48" (63mm).
The best time to visit Ann Arbor
The optimal period for a visit to Ann Arbor is synonymous with the high point of sun hours, lower cloud cover, and moderate rainfall. The calendar pages between May and September offer such conditions. During these months, the temperatures range from 67.6°F (19.8°C) to 72.5°F (22.5°C), with relatively less rain, which positively influences outdoor activities and sightseeing.
The worst time to visit Ann Arbor
The adverse period to plan a visit to Ann Arbor is typically in the winter months — from December through February. Aside from the cold weather with temperatures dipping to as low as 17.8°F (-7.9°C) in January, daylight hours are at their shortest. Heavier cloud cover, higher snowfall and fewer sunshine hours can also limit outdoor activities.
Spring weather in Ann Arbor
March signals the arrival of spring in Ann Arbor. Temperature averages start to climb up from 43°F (6.1°C) in March to 54.3°F (12.4°C) in April and escalate to 67.6°F (19.8°C) by May. Humidity level observes a downward trend from 77% to 78%, while rainfall amount increases progressively, peaking in May at 2.4" (61mm). The city blossoms under the increased daylight hours progressing from 12 hours in March to 14.6 hours in May.
Summer weather in Ann Arbor
Summers in Ann Arbor, from June to August, are warm with temperatures between 75.6°F (24.2°C) and 78.3°F (25.7°C). Daily sunshine peaks at 15.2 hours in June and then starts to slightly diminish. Humidity and cloud cover remain low, enhancing the summer appeal. However, this season also experiences a peak in rainfall, 2.2" (56mm) in July, yet it does not significantly impede outdoor activities and events.
Autumn weather in Ann Arbor
The descent of autumn upon Ann Arbor from September till November brings a change in the overall weather. The temperature begins to drop from 72.5°F (22.5°C) in September to 59.2°F (15.1°C) in October and eventually reaches 45.5°F (7.5°C) by November. Daylight hours also reduce from 12.5 hours to 9.8 hours from the beginning till the end of this season. Rainfall also sees a diminishing trend during these months.
Winter weather in Ann Arbor
Winter sets into Ann Arbor from December and continues through February. During this season, the temperature plummets to average lows of 25.7°F (-3.5°C) to 28.2°F (-2.1°C). These months bear witness to increased snowfall, with January showcasing the heaviest at 2.48" (63mm). The daylight and sunshine hours are also at their leanest, with sunshine ranging from 3.5 hours to 3 hours only, giving the city a stark winter appeal.
Weather in January
The weather in Ann Arbor, Michigan, is characteristic of a typical Midwest winter, as the city enters the new year. January's temperatures often plummet, presenting chilly conditions during the month with frequent snowfalls. As the days remain short and with minimal sunshine hours, residents often experience cold, frosty mornings and evenings. Weather in January »
Weather in February
Atlhough similar to January, February has a slight shift in weather patterns in Ann Arbor. The city remains in winter's grip, bringing snowfalls, frost, and icy roads. However, the increased daylight hours hint at the forthcoming spring season, with an increase in visibility and sunlight. Weather in February »
Weather in March
March represents a pivotal shift in Ann Arbor's weather patterns, as the region transitions from winter's chill to spring's milder conditions. Snowfall periods start to recede, with more sun-soaked hours, indicating the onset of brighter and warmer days. Weather in March »
Weather in April
In April, Ann Arbor witnesses full-fledged spring with a mix of rainy and sunny days. The city's streets and parks come alive with colorful blossoms, reflecting the fresh energy April brings. More rainfall than any other month is no surprise as spring showers contribute to the blossoming greenery. Weather in April »
Weather in May
By the time May arrives, Ann Arbor residents prepare for increasingly warm temperatures and clear skies, a sign of the imminent summer. The weather remains mild and pleasant, making it the perfect time for outdoor activities and events. Weather in May »
Weather in June
June in Ann Arbor is synonymous with the start of summer, with long sunny days and warm nights. The city witnesses increasing outdoor activities, with picnics and walks by the Huron River being favorite pastimes. The humidity also tends to rise during this time, leading to muggy afternoons. Weather in June »
Weather in July
The peak of summer in Ann Arbor is in July, with scorching temperatures throughout the day. Residents and tourists flock to local pools, rivers, and lakes to cool down and enjoy the high summer. Despite the humidity, the evenings are perfect for exploring and enjoying the city's vibrant nightlife. Weather in July »
Weather in August
August maintains the summer heat in Ann Arbor, with a slight dip in temperature compared to July. The warm, sunny days continue to dominate the city's weather, inviting people to enjoy the outdoors, whether it is picnicking, hiking, or water activities. Weather in August »
Weather in September
September in Ann Arbor marks the beginning of fall and triggers a gradual decline in temperature. It is a transitional period, as hot summer afternoons make way for crisp autumn evenings. While the leaves begin to burst into autumn colors, residents prepare for cooler weather. Weather in September »
Weather in October
October is a time when Ann Arbor is fully engulfed in fall, with mild days and cooler nights. With leaves changing into vibrant hues of red, orange, and gold, the city is a visual treat. Cultural events and Halloween festivities dominate the social calendar of October, indicating the city's residents' high spirits despite the dipping temperatures. Weather in October »
Weather in November
November in Ann Arbor ushers in the start of the cold season, with a significant drop in temperature. The trees shed their leaves preparing for winter, while the city gears up for the holiday season. The first snowfall often occurs during this time, officially marking winter's arrival. Weather in November »
Weather in December
In December, Ann Arbor is in the midst of winter with frequent snowfall, freezing temperatures, and short days. The city's cold winter combines with the holiday season to create a festive ambiance. As families gather for holiday celebrations, snow-covered streets and holiday lights make Ann Arbor a winter wonderland. Weather in December »
Updated: Jul 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest?
In Ann Arbor, the average lowest temperatures are observed in January, with a high of 28.2°F (-2.1°C) and a low of 17.8°F (-7.9°C).
What is the most humid month?
The months with the highest humidity are January and February, with an average relative humidity of 86%.
How many days does it rain?
Throughout the year, there are 144.9 rainfall days, and 18.82" (478mm) of precipitation is accumulated.
When does it snow?
January through May, October through December are months with snowfall.
How much does it snow in Ann Arbor?
In Ann Arbor, during the entire year, snow falls for 45 days and aggregates up to 9.69" (246mm) of snow.
What is the month with the least sunshine?
With an average of 3h of sunshine, January has the least sunshine of the year.
When does it snow the most?
The month with the most snowfall is February, when snow falls for 11.3 days and typically aggregates up to 2.72" (69mm) of snow.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
What is the least humid month?
The least humid month is April, with an average relative humidity of 76%.
What is the wettest month?
May is the month with the most rainfall. Rain falls for 18.2 days and accumulates 2.4" (61mm) of precipitation.
When it does not snow?
June through September are months without snowfall.
When are the longest days?
The month with the longest days is June, with an average of 15h and 12min of daylight.
What is the month with the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What time of the year is the hottest?
Ann Arbor reaches its average highest temperatures in July, measuring 79.9°F (26.6°C) at the peak and 62.2°F (16.8°C) at the lowest.
What month has the most sunshine in Ann Arbor?
July has the most sunshine of the year, with an average of 10.5h of sunshine.
What is the driest month?
December is the month with the least rainfall. Rain falls for 7.6 days and accumulates 0.87" (22mm) of precipitation.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 6min of daylight.
When is the lowest UV index?
The month with the lowest UV index is December, with an average maximum UV index of 1.
Average temperature
Ann Arbor, MI
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (28.2°F).
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).
Average pressure
Ann Arbor, MI
- Average pressure in January:
30.08"Hg - Average pressure in February:
30.07"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.04"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.08"Hg
The months with the highest atmospheric pressure are March and November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Ann Arbor, MI
- Average wind speed in January:
10.1mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.4mph - Average wind speed in April:
9.8mph - Average wind speed in May:
8.1mph - Average wind speed in June:
7.4mph
- Average wind speed in July:
6.4mph - Average wind speed in August:
6.5mph - Average wind speed in September:
7.1mph - Average wind speed in October:
8.9mph - Average wind speed in November:
9.4mph - Average wind speed in December:
9.6mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).
Average humidity
Ann Arbor, MI
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is April (76%).
Average rainfall
Ann Arbor, MI
- Average rainfall in January:
0.91" - Average rainfall in February:
0.91" - Average rainfall in March:
1.34" - Average rainfall in April:
2.24" - Average rainfall in May:
2.4" - Average rainfall in June:
2.05"
The wettest month (with the highest rainfall) is May (2.4").
The driest month (with the least rainfall) is December (0.87").
Average rainfall days
Ann Arbor, MI
- Average rainfall days in January:
5.2 days - Average rainfall days in February:
5.4 days - Average rainfall days in March:
10.2 days - Average rainfall days in April:
15.5 days - Average rainfall days in May:
18.2 days - Average rainfall days in June:
15.8 days
- Average rainfall days in July:
16.8 days - Average rainfall days in August:
15.4 days - Average rainfall days in September:
13.4 days - Average rainfall days in October:
12.2 days - Average rainfall days in November:
9.2 days - Average rainfall days in December:
7.6 days
The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is January (5.2 days).
Average snowfall
Ann Arbor, MI
- Average snowfall in January:
2.48" - Average snowfall in February:
2.72" - Average snowfall in March:
0.98" - Average snowfall in April:
0.71" - Average snowfall in May:
0.08" - Average snowfall in June:
0"
The month with the highest snowfall is February (2.72").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Ann Arbor, MI
- Average snowfall days in January:
11.5 days - Average snowfall days in February:
11.3 days - Average snowfall days in March:
6.8 days - Average snowfall days in April:
2 days - Average snowfall days in May:
0.1 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.5 days - Average snowfall days in November:
4.3 days - Average snowfall days in December:
8.5 days
The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Ann Arbor, MI
- Average daylight in January:
9h and 3min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January:
3h and 0min - Average sunshine in February:
4h and 0min - Average sunshine in March:
5h and 5min - Average sunshine in April:
7h and 1min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 5min
- Average sunshine in July:
10h and 3min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 1min - Average sunshine in October:
5h and 4min - Average sunshine in November:
4h and 5min - Average sunshine in December:
3h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days
Ann Arbor, MI
- Average sunshine days in January:
16 days - Average sunshine days in February:
13.6 days - Average sunshine days in March:
16.1 days - Average sunshine days in April:
11.7 days - Average sunshine days in May:
10.4 days - Average sunshine days in June:
11.5 days
- Average sunshine days in July:
10.3 days - Average sunshine days in August:
12 days - Average sunshine days in September:
14.6 days - Average sunshine days in October:
17.5 days - Average sunshine days in November:
16.3 days - Average sunshine days in December:
16.6 days
The month with the most sunshine days is October (17.5 days).
The month with the least sunshine days is July (10.3 days).
Average UV index
Ann Arbor, MI
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Ann Arbor, MI
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility
Ann Arbor, MI
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Ann Arbor, Michigan, USA
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