Old Mission, 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 Old Mission's primary NOAA station, OLD MISSION 3SSW.
The climate verdict for Old Mission
Old Mission, Michigan has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 46°F. Its climate comfort score of 64/100 (good) lands mid-pack nationally, exceeding 49% of station-mapped location scores.
- 46°F
- yearly average temperature, NOAA normal
- 64/100
- comfort score, above 49% of station-mapped location scores
- 31.3"
- annual precipitation
- 159 days
- frost-free days per growing season
Old Mission: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00206158 · Old Mission, MI 46°F mean · 31.3" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 46°F
- RANK-COOL #1,647
- PHOTO-FINISH ≈ Birch Hill Dam
- PRCP-MID 31.3"
- SWING-WIDE 46°F
- COMF-MID 64/100
- LOAD-HEAT 7,237 HDD
- STN-1 USC00206158
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Birch Hill Dam, MA (+ 0.1 °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.
- Old Mission (this station) 46°F
- Cold Lenox Dale, MA 46°F
- Hot Vassar, MI 46°F
- Near Birch Hill Dam, MA 46°F
- Near Hopkinton Lake, NH 46°F
Climate Living Index · Old Mission
Old Mission: 44/100 · grade D
Old Mission publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Old Mission, not an official NOAA rating. Rankings still use Comfort Score 64/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 31.3 in · 3.7 from 35 in | 87/100 · A |
| Normal heat + freeze calendar | 154 calendar days | 44/100 · D |
| Frost-free season | 159 days/year | 33/100 · F |
| Annual temperature balance | 46.2°F · 21.3° from 67.5°F | 24/100 · F |
Old Mission · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Old Mission is a continental Köppen climate: Dfb
Coldest-month mean 23.0°F and warmest-month mean 68.8°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
- 68.8°F
- Coldest month
- 23.0°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 Old Mission sits across the climate record
Three NOAA fields for Old Mission's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 76%
- Among 6,861 stations, Old Mission sits in the cooler third of annual means.
- Annual precipitation
- 42nd percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- 63rd percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Old Mission compares across U.S. station-mapped locations
Old Mission'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 | 30°F (-1°C) | 17°F (-9°C) | 23°F (-5°C) | 1.8" | 29.9 | 0.0 |
| February | 31°F (-1°C) | 16°F (-9°C) | 23°F (-5°C) | 1.2" | 27.3 | 0.0 |
| March | 41°F (5°C) | 22°F (-5°C) | 31°F (0°C) | 1.4" | 26.9 | 0.0 |
| April | 52°F (11°C) | 31°F (0°C) | 42°F (5°C) | 2.8" | 18.7 | 0.0 |
| May | 66°F (19°C) | 43°F (6°C) | 54°F (12°C) | 3.0" | 5.2 | 0.2 |
| June | 76°F (24°C) | 52°F (11°C) | 64°F (18°C) | 3.0" | 0.1 | 1.0 |
| July | 80°F (27°C) | 58°F (14°C) | 69°F (20°C) | 2.8" | 0.0 | 2.1 |
| August | 79°F (26°C) | 58°F (15°C) | 68°F (20°C) | 3.3" | 0.0 | 1.2 |
| September | 71°F (22°C) | 51°F (11°C) | 61°F (16°C) | 3.6" | 0.3 | 0.5 |
| October | 58°F (14°C) | 41°F (5°C) | 50°F (10°C) | 4.0" | 4.2 | 0.0 |
| November | 46°F (8°C) | 33°F (0°C) | 39°F (4°C) | 2.4" | 16.7 | 0.0 |
| December | 35°F (2°C) | 25°F (-4°C) | 30°F (-1°C) | 2.0" | 28.1 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 80°F around July 15, short of 90°F on every date, while 154 dates carry a normal low at or below freezing, the coldest 15°F near January 31.
The freezing stretch
The normal low stays at or below 32°F into April 18, then returns to freezing around November 17, covering 154 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.
The widest day
May 22 carries the biggest normal gap between afternoon and dawn, 23°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Old Mission.
Monthly Precipitation
Average monthly rainfall
Old Mission 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 16%, with neither reaching the 35% that would mark a distinct wet season. Old Mission has no dry season to plan around, though it does carry a wide 45.8°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: October averages 4.0" and February 1.2". The three wettest months together take 35% 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.
Frost Dates & Growing Season
First Fall Freeze
October 19
50% probability date
Last Spring Freeze
May 13
50% probability date
Growing Season
159 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
7,237
Higher = more heating needed
Cooling Degree Days
428
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside MI closest to Old Mission 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 (46°F here).
- Cashton, WI 46°F · 0.0°F off
- Clarence, PA 46°F · 0.0°F off
- Eureka, NV 46°F · 0.0°F off
- Malta, ID 46°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (31.3" here), excluding temperature-peer places.
- Rising Star, TX 31.3" · 0.0" off
- Grants Pass, OR 31.3" · 0.0" off
- Beatrice, NE 31.3" · 0.0" off
- Ely, MN 31.3" · 0.0" off
Data-derived climate profile
How Old Mission's climate pattern fits together
heating led · moderate · mid swing
Old Mission's energy balance leans toward cold weather: 7,237 annual heating degree days against 428 for cooling. Its 45.8°F seasonal range still makes the monthly rows more useful than the annual average alone.
Old Mission's frost-free season lasts about 159 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
July and January mark the typical warm and cold ends of the calendar in Old Mission's middle-range seasonal profile. The measured spread is 45.8°F. The annual average is 46°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Old Mission's 31.3 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 Old Mission'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 Old Mission, not an official NOAA class or a year-ahead forecast.
Questions about Old Mission's climate
How much rain does Old Mission get? ▼
How cold does Old Mission get in winter? ▼
How much energy does heating and cooling require in Old Mission? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Old Mission's primary station: OLD MISSION 3SSW (USC00206158). 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 Old Mission; 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 Old Mission 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.