Ann Arbor weather in April
In April, Ann Arbor sees average daytime highs of 57°F and overnight lows near 39°F, with 3.6 in of precipitation across 11.8 wet days and about 13.1 hours of daylight. It is the 7th-warmest and 3rd-wettest month of the year here.
Highs climb over the month, from about 52°F in the first days to 62°F by the end. The sky is clear or mostly clear about 21% of the time in April, and the air most often feels dry.
Daylight stretches from about 12 h 24 min at the start of April to 13 h 48 min by month's end. Set against the rest of the year, April is Ann Arbor's 7th-clearest and 2nd-windiest month. For the whole year in context, see Ann Arbor's year-round climate.
- Daytime high
- 57°
- 7th warmest
- Overnight low
- 39°
- 6th coldest
- Precipitation
- 3.6 in
- 11.8 wet days
- Daylight
- 13 h 06 min
- 6:01 AM – 7:10 PM
- Cloud cover
- 68%
- 7th clearest
- Wind
- 9 mph
- 2nd windiest
- Solar energy
- 4.95 kWh/m²
- Travel score
- 3.9
- out of 10
Ann Arbor is county seat of Washtenaw County, Michigan, United States.
- Density
- 1,561/km²
- people per km²
- Founded
- 1824
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in April
Highs climb over the month, from about 52°F in the first days to 62°F by the end.
A typical April day in Ann Arbor reaches about 57°F in the afternoon and slips back to 39°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 44°F and 72°F. Set against its neighbours, April runs about 13°F warmer than March and about 11°F cooler than May.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 52 | 52 | 52 | 53 | 53 | 54 | 54 | 55 | 55 | 55 | 56 | 56 | 57 | 57 | 57 | 58 | 58 | 58 | 59 | 59 | 60 | 60 | 60 | 60 | 61 | 61 | 62 | 62 | 62 | 63 |
| Avg low (°F) | 34 | 34 | 34 | 35 | 35 | 35 | 36 | 36 | 36 | 37 | 37 | 37 | 38 | 38 | 38 | 39 | 39 | 39 | 40 | 40 | 40 | 41 | 41 | 42 | 42 | 42 | 43 | 43 | 43 | 44 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 52 | 34 |
| 2 | 52 | 34 |
| 3 | 52 | 34 |
| 4 | 53 | 35 |
| 5 | 53 | 35 |
| 6 | 54 | 35 |
| 7 | 54 | 36 |
| 8 | 55 | 36 |
| 9 | 55 | 36 |
| 10 | 55 | 37 |
| 11 | 56 | 37 |
| 12 | 56 | 37 |
| 13 | 57 | 38 |
| 14 | 57 | 38 |
| 15 | 57 | 38 |
| 16 | 58 | 39 |
| 17 | 58 | 39 |
| 18 | 58 | 39 |
| 19 | 59 | 40 |
| 20 | 59 | 40 |
| 21 | 60 | 40 |
| 22 | 60 | 41 |
| 23 | 60 | 41 |
| 24 | 60 | 42 |
| 25 | 61 | 42 |
| 26 | 61 | 42 |
| 27 | 62 | 43 |
| 28 | 62 | 43 |
| 29 | 62 | 43 |
| 30 | 63 | 44 |
How April really feels in Ann Arbor
Once humidity and wind are folded in, April averages 0 days that feel above 90°F and 14 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
The story in April is cold — wind chill drags the overnight "feels like" below the raw low.
Ann Arbor weather by month
How April compares with the rest of the year at a glance. April is the 7th-warmest and 3rd-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 31° / 19° | 2.4 | 9.7 | 6.1 | 9.3 | 0.0 |
| Feb | 34° / 20° | 2.1 | 8.2 | 5.6 | 10.3 | 0.0 |
| Mar | 45° / 28° | 2.5 | 9.7 | 3.6 | 11.6 | 1.0 |
| Apr | 57° / 39° | 3.6 | 11.8 | 1.3 | 13.1 | 3.9 |
| May | 68° / 49° | 3.9 | 12.5 | 0 | 14.4 | 5.9 |
| Jun | 78° / 59° | 3.7 | 10.5 | 0 | 15 | 6.6 |
| Jul | 82° / 63° | 3.3 | 10.8 | 0 | 14.8 | 6.3 |
| Aug | 80° / 61° | 3.3 | 10.3 | 0 | 13.7 | 6.6 |
| Sep | 73° / 54° | 2.7 | 8.6 | 0 | 12.3 | 6.9 |
| Oct | 60° / 43° | 2.7 | 9.3 | 0.2 | 10.8 | 4.9 |
| Nov | 47° / 33° | 2.6 | 9 | 1.9 | 9.6 | 1.5 |
| Dec | 36° / 25° | 2.3 | 9 | 4.6 | 9 | 0.0 |
Cloud cover in April
The sky is clear or mostly clear about 21% of the time in April.
Beyond those clear spells, partly cloudy skies cover about 13% of April, with mostly cloudy or overcast conditions the remaining 66%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 32 | 31 | 31 | 33 | 33 | 33 | 32 | 32 | 34 | 34 | 34 | 34 | 33 | 33 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 35 | 35 | 35 | 34 | 35 | 35 | 35 | 36 |
| Cloudier (%) | 68 | 69 | 69 | 67 | 67 | 67 | 68 | 68 | 66 | 66 | 66 | 66 | 67 | 67 | 66 | 66 | 66 | 66 | 66 | 66 | 66 | 66 | 65 | 65 | 65 | 66 | 65 | 65 | 65 | 64 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 32 | 68 |
| 2 | 31 | 69 |
| 3 | 31 | 69 |
| 4 | 33 | 67 |
| 5 | 33 | 67 |
| 6 | 33 | 67 |
| 7 | 32 | 68 |
| 8 | 32 | 68 |
| 9 | 34 | 66 |
| 10 | 34 | 66 |
| 11 | 34 | 66 |
| 12 | 34 | 66 |
| 13 | 33 | 67 |
| 14 | 33 | 67 |
| 15 | 34 | 66 |
| 16 | 34 | 66 |
| 17 | 34 | 66 |
| 18 | 34 | 66 |
| 19 | 34 | 66 |
| 20 | 34 | 66 |
| 21 | 34 | 66 |
| 22 | 34 | 66 |
| 23 | 35 | 65 |
| 24 | 35 | 65 |
| 25 | 35 | 65 |
| 26 | 34 | 66 |
| 27 | 35 | 65 |
| 28 | 35 | 65 |
| 29 | 35 | 65 |
| 30 | 36 | 64 |
Chance of precipitation in April
Ann Arbor gets around 3.6 in of rain and snow over 11.8 wet days in April. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 39% and peaks near 40% on the wettest days, and about 1 day brings snow.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 35 | 36 | 37 | 37 | 38 | 38 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 |
| Snow chance (%) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 0 | 0 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 35 | 7 |
| 2 | 36 | 7 |
| 3 | 37 | 7 |
| 4 | 37 | 7 |
| 5 | 38 | 7 |
| 6 | 38 | 7 |
| 7 | 39 | 7 |
| 8 | 39 | 7 |
| 9 | 39 | 6 |
| 10 | 39 | 6 |
| 11 | 39 | 6 |
| 12 | 39 | 6 |
| 13 | 39 | 5 |
| 14 | 39 | 5 |
| 15 | 39 | 5 |
| 16 | 39 | 4 |
| 17 | 39 | 4 |
| 18 | 39 | 3 |
| 19 | 39 | 3 |
| 20 | 39 | 3 |
| 21 | 39 | 2 |
| 22 | 39 | 2 |
| 23 | 40 | 2 |
| 24 | 40 | 1 |
| 25 | 40 | 1 |
| 26 | 40 | 1 |
| 27 | 40 | 1 |
| 28 | 40 | 1 |
| 29 | 40 | 0 |
| 30 | 40 | 0 |
Humidity in April
Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, April lands in the dry band about 97% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 98 | 98 | 98 | 98 | 98 | 97 | 97 | 97 | 97 | 96 | 96 | 96 | 95 | 95 | 95 | 95 | 94 | 94 | 94 | 94 | 94 | 93 | 92 |
| Comfortable (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 6 | 6 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 |
| Dry (%) | Comfortable (%) | Humid (%) | |
|---|---|---|---|
| 1 | 99 | 1 | 0 |
| 2 | 99 | 1 | 0 |
| 3 | 99 | 1 | 0 |
| 4 | 99 | 1 | 0 |
| 5 | 99 | 1 | 0 |
| 6 | 99 | 1 | 0 |
| 7 | 99 | 1 | 0 |
| 8 | 98 | 1 | 1 |
| 9 | 98 | 1 | 1 |
| 10 | 98 | 1 | 1 |
| 11 | 98 | 1 | 1 |
| 12 | 98 | 1 | 1 |
| 13 | 97 | 2 | 1 |
| 14 | 97 | 2 | 1 |
| 15 | 97 | 2 | 1 |
| 16 | 97 | 2 | 1 |
| 17 | 96 | 3 | 1 |
| 18 | 96 | 3 | 1 |
| 19 | 96 | 3 | 1 |
| 20 | 95 | 4 | 1 |
| 21 | 95 | 4 | 1 |
| 22 | 95 | 4 | 1 |
| 23 | 95 | 4 | 1 |
| 24 | 94 | 5 | 1 |
| 25 | 94 | 5 | 1 |
| 26 | 94 | 5 | 1 |
| 27 | 94 | 5 | 1 |
| 28 | 94 | 5 | 1 |
| 29 | 93 | 6 | 1 |
| 30 | 92 | 6 | 2 |
Wind in April
Winds average 9 mph in April.
Across April, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 9 | light breeze |
| 2 | 9 | light breeze |
| 3 | 9 | light breeze |
| 4 | 9 | light breeze |
| 5 | 9 | light breeze |
| 6 | 9 | light breeze |
| 7 | 9 | light breeze |
| 8 | 9 | light breeze |
| 9 | 9 | light breeze |
| 10 | 9 | light breeze |
| 11 | 9 | light breeze |
| 12 | 9 | light breeze |
| 13 | 9 | light breeze |
| 14 | 9 | light breeze |
| 15 | 9 | light breeze |
| 16 | 9 | light breeze |
| 17 | 9 | light breeze |
| 18 | 9 | light breeze |
| 19 | 9 | light breeze |
| 20 | 9 | light breeze |
| 21 | 9 | light breeze |
| 22 | 9 | light breeze |
| 23 | 9 | light breeze |
| 24 | 9 | light breeze |
| 25 | 9 | light breeze |
| 26 | 8 | light breeze |
| 27 | 8 | light breeze |
| 28 | 8 | light breeze |
| 29 | 8 | light breeze |
| 30 | 8 | light breeze |
Sunrise & sunset in April
Daylight runs from about 12 h 24 min at the start of April to 13 h 48 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 84 minutes over April. Sunrise moves from 6:27 AM to 5:39 AM, and sunset from 6:52 PM to 7:25 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.4 | 12.5 | 12.5 | 12.6 | 12.6 | 12.7 | 12.7 | 12.8 | 12.8 | 12.9 | 12.9 | 13.0 | 13.0 | 13.1 | 13.1 | 13.1 | 13.2 | 13.2 | 13.3 | 13.3 | 13.4 | 13.4 | 13.5 | 13.5 | 13.6 | 13.6 | 13.6 | 13.7 | 13.7 | 13.8 |
| Sunrise (AM) | 6:27 | 6:25 | 6:23 | 6:21 | 6:20 | 6:18 | 6:16 | 6:14 | 6:13 | 6:11 | 6:09 | 6:08 | 6:06 | 6:04 | 6:03 | 6:01 | 5:59 | 5:58 | 5:56 | 5:54 | 5:53 | 5:51 | 5:50 | 5:48 | 5:47 | 5:45 | 5:44 | 5:42 | 5:41 | 5:39 |
| Sunset (PM) | 6:52 | 6:54 | 6:55 | 6:56 | 6:57 | 6:58 | 6:59 | 7:00 | 7:02 | 7:03 | 7:04 | 7:05 | 7:06 | 7:07 | 7:08 | 7:10 | 7:11 | 7:12 | 7:13 | 7:14 | 7:15 | 7:16 | 7:17 | 7:19 | 7:20 | 7:21 | 7:22 | 7:23 | 7:24 | 7:25 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.4 | 6:27 | 6:52 |
| 2 | 12.5 | 6:25 | 6:54 |
| 3 | 12.5 | 6:23 | 6:55 |
| 4 | 12.6 | 6:21 | 6:56 |
| 5 | 12.6 | 6:20 | 6:57 |
| 6 | 12.7 | 6:18 | 6:58 |
| 7 | 12.7 | 6:16 | 6:59 |
| 8 | 12.8 | 6:14 | 7:00 |
| 9 | 12.8 | 6:13 | 7:02 |
| 10 | 12.9 | 6:11 | 7:03 |
| 11 | 12.9 | 6:09 | 7:04 |
| 12 | 13.0 | 6:08 | 7:05 |
| 13 | 13.0 | 6:06 | 7:06 |
| 14 | 13.1 | 6:04 | 7:07 |
| 15 | 13.1 | 6:03 | 7:08 |
| 16 | 13.1 | 6:01 | 7:10 |
| 17 | 13.2 | 5:59 | 7:11 |
| 18 | 13.2 | 5:58 | 7:12 |
| 19 | 13.3 | 5:56 | 7:13 |
| 20 | 13.3 | 5:54 | 7:14 |
| 21 | 13.4 | 5:53 | 7:15 |
| 22 | 13.4 | 5:51 | 7:16 |
| 23 | 13.5 | 5:50 | 7:17 |
| 24 | 13.5 | 5:48 | 7:19 |
| 25 | 13.6 | 5:47 | 7:20 |
| 26 | 13.6 | 5:45 | 7:21 |
| 27 | 13.6 | 5:44 | 7:22 |
| 28 | 13.7 | 5:42 | 7:23 |
| 29 | 13.7 | 5:41 | 7:24 |
| 30 | 13.8 | 5:39 | 7:25 |
Solar energy in April
Average shortwave solar energy reaching the ground each day in April, about 4.95 kWh/m².
For context, solar energy here swings from a low near 1.45 kWh/m² to a high of 6.3 kWh/m² in June across the year — April's 4.95 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.5 | 4.5 | 4.5 | 4.5 | 4.6 | 4.6 | 4.6 | 4.7 | 4.7 | 4.8 | 4.8 | 4.8 | 4.9 | 4.9 | 4.9 | 5.0 | 5.0 | 5.0 | 5.1 | 5.1 | 5.1 | 5.2 | 5.2 | 5.2 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.4 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.5 | Bright |
| 2 | 4.5 | Bright |
| 3 | 4.5 | Bright |
| 4 | 4.5 | Bright |
| 5 | 4.6 | Bright |
| 6 | 4.6 | Bright |
| 7 | 4.6 | Bright |
| 8 | 4.7 | Bright |
| 9 | 4.7 | Bright |
| 10 | 4.8 | Bright |
| 11 | 4.8 | Bright |
| 12 | 4.8 | Bright |
| 13 | 4.9 | Bright |
| 14 | 4.9 | Bright |
| 15 | 4.9 | Bright |
| 16 | 5.0 | Bright |
| 17 | 5.0 | Bright |
| 18 | 5.0 | Bright |
| 19 | 5.1 | Bright |
| 20 | 5.1 | Bright |
| 21 | 5.1 | Bright |
| 22 | 5.2 | Bright |
| 23 | 5.2 | Bright |
| 24 | 5.2 | Bright |
| 25 | 5.3 | Bright |
| 26 | 5.3 | Bright |
| 27 | 5.3 | Bright |
| 28 | 5.3 | Bright |
| 29 | 5.3 | Bright |
| 30 | 5.4 | Bright |
Is April a good time to visit Ann Arbor?
Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
April is a weaker month for outdoor sightseeing in Ann Arbor.
What to pack for Ann Arbor in April
From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In April, Ann Arbor sees daytime highs around 57°F and nights near 39°F. Worth packing: a warm layer, rain gear and sun protection. About 12 days see rain.
Sea temperature near Ann Arbor in April
The nearest coast averages about 44°F in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 34 mi away) is warmest in August at about 75°F and coldest in February near 33°F.
It's comfortable for a long swim from Jun 20 to Sep 20 — about 3.1 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 34 | 33 | 36 | 44 | 56 | 67 | 75 | 75 | 70 | 58 | 46 | 38 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Warm | Refreshing | Bracing | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 34 | Bracing |
| Feb | 33 | Bracing |
| Mar | 36 | Bracing |
| Apr | 44 | Bracing |
| May | 56 | Bracing |
| Jun | 67 | Cool |
| Jul | 75 | Refreshing |
| Aug | 75 | Warm |
| Sep | 70 | Refreshing |
| Oct | 58 | Bracing |
| Nov | 46 | Bracing |
| Dec | 38 | Bracing |
UV index in Ann Arbor in April
Clear-sky midday UV in April peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Ann Arbor peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 2 | 4 | 6 | 7 | 9 | 9 | 7 | 6 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | High | Very high | Very high | High | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 2 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 7 | High |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 7 | High |
| Sep | 6 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Moderate |
| Dec | 1 | Low |
Air quality in Ann Arbor in April
Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.
Air quality in Ann Arbor is worst in July — around 16 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 8 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 10 | 13 | 14 | 13 | 15 | 16 | 16 | 15 | 12 | 8 | 9 | 9 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 13 | Moderate |
| Mar | 14 | Moderate |
| Apr | 13 | Moderate |
| May | 15 | Moderate |
| Jun | 16 | Moderate |
| Jul | 16 | Moderate |
| Aug | 15 | Moderate |
| Sep | 12 | Good |
| Oct | 8 | Good |
| Nov | 9 | Good |
| Dec | 9 | Good |
Where is Ann Arbor?
Ann Arbor sits at 42.3°N, 83.7°W, 883 ft above sea level, in United States. The nearest listed city is Ypsilanti, 6.8 mi away.
Topography around Ann Arbor
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Ann Arbor.
Within 2 miles, the terrain around Ann Arbor has only modest variations in elevation — a maximum elevation change of 295 ft around an average of 883 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 436 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 945 ft.
The land around Ann Arbor is covered by trees (60%) and artificial surfaces (30%) within 2 miles, trees (49%) and grassland (24%) within 10 miles, and trees (40%) and cropland (29%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Ann Arbor (42.2776°, -83.7409°, elevation 883 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).