Ann Arbor U of Mich, MI Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from Ann Arbor U of Mich's primary NOAA station, ANN ARBOR U OF MICH.
The climate verdict for Ann Arbor U of Mich
Ann Arbor U of Mich, Michigan has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 49°F. At 54/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 31% of scores.
- 49°F
- annual average temperature (NOAA normal)
- 54/100
- comfort score, above 31% of station-mapped location scores
- 38.3"
- annual precipitation · 61" snow
- 163 days
- frost-free growing season
Ann Arbor U of Mich: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00200230 · Ann Arbor U of Mich, MI 49°F mean · 38.3" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 49°F
- RANK-COOL #2,401
- PHOTO-FINISH ≈ New Raymer
- PRCP-MID 38.3"
- SWING-WIDE 48°F
- COMF-LOW 54/100
- LOAD-HEAT 6,501 HDD
- STN-1 USC00200230
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: New Raymer, CO (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every MI station list.
- Ann Arbor U of… (this station) 49°F
- Hot Mitchell, NE 49°F
- Near New Raymer, CO 49°F
- Near Saratoga Springs, NY 49°F
- Near Fitchburg, MA 49°F
Climate Living Index · Ann Arbor U of Mich
Ann Arbor U of Mich: 46/100 · grade D
Ann Arbor U of Mich publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Ann Arbor U of Mich, not an official NOAA rating. Rankings still use Comfort Score 54/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 38.3 in · 3.3 from 35 in | 88/100 · A |
| Normal heat + freeze calendar | 148 calendar days | 48/100 · D |
| Frost-free season | 163 days/year | 36/100 · F |
| Annual temperature balance | 48.8°F · 18.7° from 67.5°F | 35/100 · F |
| Snowfall burden | 61.4 inches/year | 15/100 · F |
Ann Arbor U of Mich · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Ann Arbor U of Mich is a continental Köppen climate: Dfa
Coldest-month mean 24.0°F and warmest-month mean 71.9°F place this station in continental, no dry season, hot summer climates (Dfa). Class Dfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, hot summer.
- Köppen code
- Dfa
- Group
- Continental
- Warmest month
- 71.9°F
- Coldest month
- 24.0°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Ann Arbor U of Mich sits across the climate record
Three NOAA fields for Ann Arbor U of Mich's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 35th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 54th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Wider than 72%
- Warmest-to-coldest month gap for Ann Arbor U of Mich is large versus 6,861 complete station-years.
How Ann Arbor U of Mich compares across U.S. station-mapped locations
Ann Arbor U of Mich's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
54 31st percentile score exceeds 31% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). This entry sits in this band.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Ann Arbor U of Mich's measured station temperature trend
MethodologyAcross 113 complete annual observations from 1890 to 2025, ANN ARBOR U OF MICH warmed at a fitted rate of 0.15°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Ann Arbor U of Mich primary station fitted change +0.15 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 32°F (0°C) | 16°F (-9°C) | 24°F (-4°C) | 3.0" | 18.3" | 28.0 | 0.0 |
| February | 35°F (2°C) | 18°F (-8°C) | 27°F (-3°C) | 2.5" | 15.3" | 25.3 | 0.0 |
| March | 46°F (8°C) | 25°F (-4°C) | 36°F (2°C) | 2.8" | 8.3" | 22.1 | 0.0 |
| April | 60°F (15°C) | 36°F (2°C) | 48°F (9°C) | 3.4" | 2.6" | 8.8 | 0.0 |
| May | 71°F (22°C) | 47°F (8°C) | 59°F (15°C) | 3.8" | 0.0" | 0.5 | 0.3 |
| June | 80°F (27°C) | 56°F (13°C) | 68°F (20°C) | 3.9" | 0.0" | 0.0 | 2.8 |
| July | 84°F (29°C) | 60°F (16°C) | 72°F (22°C) | 3.5" | 0.0" | 0.0 | 5.8 |
| August | 82°F (28°C) | 59°F (15°C) | 70°F (21°C) | 3.5" | 0.0" | 0.0 | 2.3 |
| September | 75°F (24°C) | 52°F (11°C) | 63°F (17°C) | 3.2" | 0.0" | 0.1 | 1.1 |
| October | 62°F (17°C) | 41°F (5°C) | 51°F (11°C) | 3.0" | 0.1" | 3.7 | 0.0 |
| November | 48°F (9°C) | 31°F (-1°C) | 39°F (4°C) | 2.8" | 4.1" | 15.7 | 0.0 |
| December | 36°F (2°C) | 22°F (-5°C) | 29°F (-2°C) | 2.8" | 12.7" | 25.9 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 84°F around July 11, short of 90°F on every date, while 148 dates carry a normal low at or below freezing, the coldest 15°F near January 23.
The freezing stretch
The normal low stays at or below 32°F into April 6, then returns to freezing around November 11, covering 148 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is January 5, when 59% of years recorded at least a hundredth of an inch. The driest is September 1 at 35%. Summed across the calendar, that is about 166 wet dates a year.
The widest day
May 4 carries the biggest normal gap between afternoon and dawn, 25°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Ann Arbor U of Mich.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 18.3"
18.3 days with precipitation
Snow: 15.3"
14.4 days with precipitation
Snow: 8.3"
14.3 days with precipitation
Snow: 2.6"
14.4 days with precipitation
14.7 days with precipitation
12.4 days with precipitation
11.7 days with precipitation
11.2 days with precipitation
10.6 days with precipitation
Snow: 0.1"
13.3 days with precipitation
Snow: 4.1"
13.5 days with precipitation
Snow: 12.7"
16.9 days with precipitation
Ann Arbor U of Mich spreads its precipitation across the year
Neither half of the year dominates here: June through August take 29% of the annual total and December through February 21%, with neither reaching the 35% that would mark a distinct wet season. Ann Arbor U of Mich has no dry season to plan around, though it does carry a wide 47.9°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: June averages 3.9" and February 2.5". The three wettest months together take 29% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
How Ann Arbor U of Mich's precipitation splits across the calendar
About 166 days a year record measurable precipitation here, carrying 38.3" between them, or roughly 0.23 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Winter brings real snow to Ann Arbor U of Mich
Ann Arbor U of Mich averages 61.4 inches of snowfall a year, with January the snowiest month on the normals, spread across roughly 54 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 61.4 inches of depth.
- Days recording measurable snow: about 54 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 16% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
October 13
50% probability date
Last Spring Freeze
May 3
50% probability date
Growing Season
163 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,501
Higher = more heating needed
Cooling Degree Days
653
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside MI closest to Ann Arbor U of Mich on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (49°F here).
- Arthur, NE 49°F · 0.0°F off
- Buffalo, NY 49°F · 0.0°F off
- Canandaigua, NY 49°F · 0.0°F off
- Cedaredge, CO 49°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (38.3" here), excluding temperature-peer places.
- Haysville, KS 38.3" · 0.0" off
- Guthrie, OK 38.2" · 0.0" off
- Romney, WV 38.2" · 0.0" off
- Farmingdale, NY 38.3" · 0.0" off
Snow and freeze rhythm
When cold and snow define Ann Arbor U of Mich
heating led · moderate · mid swing
Ann Arbor U of Mich's energy balance leans toward cold weather: 6,501 annual heating degree days against 653 for cooling. Its 47.9°F seasonal range still makes the monthly rows more useful than the annual average alone.
Ann Arbor U of Mich's frost-free season lasts about 163 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Ann Arbor U of Mich coldest normal
January
Averaging 24°F (-4°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Ann Arbor U of Mich typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Ann Arbor U of Mich snow peak
January
Ann Arbor U of Mich averages 61.4 inches of snow a year, with January the snowiest month on the normals.
Questions about Ann Arbor U of Mich's climate
How much snow does Ann Arbor U of Mich get? ▼
How cold does Ann Arbor U of Mich get in winter? ▼
How much energy does heating and cooling require in Ann Arbor U of Mich? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Ann Arbor U of Mich's primary station: ANN ARBOR U OF MICH (USC00200230). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Ann Arbor U of Mich; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Ann Arbor U of Mich comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.