Ann Arbor Muni, MI Climate: Temperature & Rain by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from Ann Arbor Muni's primary NOAA station, ANN ARBOR MUNI AP.
The climate verdict for Ann Arbor Muni
Ann Arbor Muni, Michigan has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 48°F. Its climate comfort score of 64/100 (good) lands mid-pack nationally, exceeding 49% of station-mapped location scores.
- 48°F
- yearly average temperature, NOAA normal
- 64/100
- comfort score, above 49% of station-mapped location scores
- 29.8"
- precipitation, annual total
- 149 days
- frost-free growing season
Ann Arbor Muni: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00094889 · Ann Arbor Muni, MI 48°F mean · 29.8" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 48°F
- RANK-COOL #2,127
- PHOTO-FINISH ≈ W Hampstead
- PRCP-MID 29.8"
- SWING-WIDE 47°F
- COMF-MID 64/100
- LOAD-HEAT 6,742 HDD
- STN-1 USW00094889
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: W Hampstead, NH (+ 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 (this station) 48°F
- Hot Avon, NY 48°F
- Near W Hampstead, NH 48°F
- Near Elko Rgnl, NV 48°F
- Near Chugwater, WY 48°F
Climate Living Index · Ann Arbor Muni
Ann Arbor Muni: 45/100 · grade D
Ann Arbor Muni publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Ann Arbor Muni, not an official NOAA rating. Rankings still use Comfort Score 64/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 29.8 in · 5.2 from 35 in | 81/100 · B |
| Normal heat + freeze calendar | 151 calendar days | 46/100 · D |
| Annual temperature balance | 47.8°F · 19.7° from 67.5°F | 31/100 · F |
| Frost-free season | 149 days/year | 24/100 · F |
Ann Arbor Muni · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Ann Arbor Muni is a continental Köppen climate: Dfb
Coldest-month mean 23.5°F and warmest-month mean 70.5°F place this station in continental, no dry season, warm summer climates (Dfb). Class Dfb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, warm summer.
- Köppen code
- Dfb
- Group
- Continental
- Warmest month
- 70.5°F
- Coldest month
- 23.5°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 Muni sits across the climate record
Three NOAA fields for Ann Arbor Muni's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 31st percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 40th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- 68th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Ann Arbor Muni compares across U.S. station-mapped locations
Ann Arbor Muni's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
64 49th percentile score exceeds 49% 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%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). This entry sits in this band.
- 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
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 32°F (0°C) | 15°F (-9°C) | 24°F (-5°C) | 1.7" | 28.5 | 0.0 |
| February | 35°F (1°C) | 16°F (-9°C) | 25°F (-4°C) | 1.5" | 26.3 | 0.0 |
| March | 45°F (7°C) | 25°F (-4°C) | 35°F (2°C) | 1.9" | 24.2 | 0.0 |
| April | 59°F (15°C) | 35°F (2°C) | 47°F (8°C) | 3.0" | 11.7 | 0.0 |
| May | 70°F (21°C) | 46°F (8°C) | 58°F (14°C) | 3.4" | 2.5 | 0.2 |
| June | 79°F (26°C) | 54°F (12°C) | 66°F (19°C) | 3.6" | 0.0 | 2.2 |
| July | 84°F (29°C) | 57°F (14°C) | 71°F (21°C) | 3.2" | 0.0 | 5.3 |
| August | 81°F (27°C) | 57°F (14°C) | 69°F (21°C) | 2.7" | 0.0 | 2.1 |
| September | 74°F (23°C) | 48°F (9°C) | 61°F (16°C) | 2.8" | 0.7 | 1.1 |
| October | 62°F (16°C) | 38°F (3°C) | 50°F (10°C) | 2.2" | 9.5 | 0.0 |
| November | 48°F (9°C) | 30°F (-1°C) | 39°F (4°C) | 2.1" | 19.6 | 0.0 |
| December | 36°F (2°C) | 22°F (-6°C) | 29°F (-2°C) | 1.7" | 26.5 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 84°F around July 15, short of 90°F on every date, while 151 dates carry a normal low at or below freezing, the coldest 14°F near January 28.
The freezing stretch
The normal low stays at or below 32°F into April 5, then returns to freezing around November 7, covering 151 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 May 10, when 44% of years recorded at least a hundredth of an inch. The driest is February 13 at 31%. Summed across the calendar, that is about 135 wet dates a year.
The widest day
July 5 carries the biggest normal gap between afternoon and dawn, 27°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Ann Arbor Muni.
Monthly Precipitation
Average monthly rainfall
10.4 days with precipitation
8.9 days with precipitation
10.1 days with precipitation
12.3 days with precipitation
13.9 days with precipitation
11.1 days with precipitation
10.7 days with precipitation
12.0 days with precipitation
11.6 days with precipitation
12.0 days with precipitation
10.0 days with precipitation
11.4 days with precipitation
Ann Arbor Muni spreads its precipitation across the year
Neither half of the year dominates here: June through August take 32% of the annual total and December through February 16%, with neither reaching the 35% that would mark a distinct wet season. Ann Arbor Muni has no dry season to plan around, though it does carry a wide 47°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: June averages 3.6" and February 1.5". The three wettest months together take 34% 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 Muni's precipitation splits across the calendar
About 134 days a year record measurable precipitation here, carrying 29.8" between them, or roughly 0.22 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.
Frost Dates & Growing Season
First Fall Freeze
October 4
50% probability date
Last Spring Freeze
May 8
50% probability date
Growing Season
149 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,742
Higher = more heating needed
Cooling Degree Days
520
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside MI closest to Ann Arbor Muni 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 (48°F here).
- Alliance, NE 48°F · 0.0°F off
- Broadwater, NE 48°F · 0.0°F off
- Chugwater, WY 48°F · 0.0°F off
- Colo, IA 48°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (29.8" here), excluding temperature-peer places.
- Litchfield, MN 29.8" · 0.0" off
- Hutchinson, MN 29.8" · 0.0" off
- Glenwood, WA 29.8" · 0.0" off
- Walthill, NE 29.8" · 0.0" off
Data-derived climate profile
How Ann Arbor Muni's climate pattern fits together
heating led · moderate · mid swing
Ann Arbor Muni's energy balance leans toward cold weather: 6,742 annual heating degree days against 520 for cooling. Its 47.0°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 149 days are frost-free in a normal year. That short interval is consistent with the cold-season signal, but the measure does not predict the exact first or last freeze in any one year.
July and January mark the typical warm and cold ends of the calendar in Ann Arbor Muni's middle-range seasonal profile. The measured spread is 47.0°F. The annual average is 48°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Ann Arbor Muni's 29.8 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Snowfall is not added to the interpretation because its annual value is missing. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from Ann Arbor Muni's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Ann Arbor Muni, not an official NOAA class or a year-ahead forecast.
Questions about Ann Arbor Muni's climate
How much rain does Ann Arbor Muni get? ▼
How cold does Ann Arbor Muni get in winter? ▼
How much energy does heating and cooling require in Ann Arbor Muni? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Ann Arbor Muni's primary station: ANN ARBOR MUNI AP (USW00094889). 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 Muni; 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 Muni 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.