Allegan, Michigan climate: Normal weather by month, frost dates and records
Allegan's normal year runs from 16°F January nights to 82°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.6°C, January lows of −9°C, July highs of 28°C.
- NOAA stationAllegan (5 mi NE)
- Station IDUSC00200128
- Location42.58°N 85.79°W
- Elevation750 ft (229 m)
- From the center4 miles
- Population5,152
On October 23, the normal high in Allegan is 58°F and the normal low 38°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Allegan.
- Jan 30° 16°
- Feb 33° 16°
- Mar 43° 24°
- Apr 58° 34°
- May 68° 45°
- Jun 78° 55°
- Jul 82° 58°
- Aug 80° 58°
- Sep 73° 50°
- Oct 61° 40°
- Nov 47° 31°
- Dec 35° 22°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Allegan each month?
July is the warmest month, with normal highs of 82°F; January the coldest, with normal lows of 16°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 30°F | 16°F | 22.9°F | – | <1 | 29 | 9 h 20 min |
| February | 33°F | 16°F | 24.4°F | – | <1 | 26 | 10 h 30 min |
| March | 43°F | 24°F | 33.7°F | – | <1 | 25 | 11 h 50 min |
| April | 58°F | 34°F | 45.9°F | – | <1 | 13 | 13 h 20 min |
| May | 68°F | 45°F | 56.8°F | – | <1 | 2 | 14 h 30 min |
| June | 78°F | 55°F | 66.7°F | – | 1 | <1 | 15 h 20 min |
| July | 82°F | 58°F | 69.8°F | – | 2 | <1 | 15 h |
| August | 80°F | 58°F | 68.9°F | – | 1 | <1 | 14 h |
| September | 73°F | 50°F | 61.6°F | – | 1 | <1 | 12 h 30 min |
| October | 61°F | 40°F | 50.5°F | – | <1 | 7 | 11 h 10 min |
| November | 47°F | 31°F | 38.9°F | – | <1 | 18 | 9 h 50 min |
| December | 35°F | 22°F | 28.7°F | – | <1 | 27 | 9 h 10 min |
| Year (annual) | 57°F | 38°F | 47.4°F | – | 5 | 148 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | −1°C | −9°C | −5.1°C |
| February | 0°C | −9°C | −4.2°C |
| March | 6°C | −4°C | 0.9°C |
| April | 14°C | 1°C | 7.7°C |
| May | 20°C | 7°C | 13.8°C |
| June | 26°C | 13°C | 19.3°C |
| July | 28°C | 14°C | 21.0°C |
| August | 27°C | 14°C | 20.5°C |
| September | 23°C | 10°C | 16.4°C |
| October | 16°C | 5°C | 10.3°C |
| November | 8°C | −1°C | 3.8°C |
| December | 2°C | −5°C | −1.8°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Bloomingdale (16 miles away), gets 109 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00200128; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Allegan?
Normal highs sit between 65°F and 85°F in May, June, July, August and September.
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00200128.
When is the last frost in Allegan?
In Allegan, the last spring frost (32°F) comes after May 4 in half of years and after May 22 in one year in ten; the first autumn frost comes before October 15 in half of years and before September 30 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- May 41 year in 10 after May 22; 9 in 10 after April 22
- First autumn frost, half of years before
- October 151 year in 10 before September 30; 9 in 10 before October 29
NOAA puts the median frost-free season at 160 days, and the season without a hard freeze (28°F) at 184 days.
A hard freeze (28°F) comes after April 24 in half of springs and before October 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Allegan in zone 6a in ZIP code 49010, the nearest ZIP area.
Frost dates for every NOAA station in Michigan · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00200128; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Allegan?
In a normal year in Allegan, 5 days a year reach 90°F and 148 nights fall to 32°F or colder.
- Days at 90°F or more
- 5a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 148a normal year
- Days that stay below freezing
- 51high of 32°F or less
The highest temperature in this station's record (since 1890) is 106°F, on July 29, 1916; the lowest is −29°F, on February 10, 1912.
The wettest calendar year on that record is 1914, with 56.65 in; the snowiest season is 1964–65, with 133.2 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00200128; records: ACIS (NOAA Regional Climate Centers), station USC00200128. Records use complete months only; a month missing more than three days is left out.
How sunny is Allegan?
Over a year 70% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Allegan, 3.8 kWh per square metre a day. July is the sunniest month (81%) and December the cloudiest (50%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 52% | 1.4 |
| February | 57% | 2.2 |
| March | 65% | 3.5 |
| April | 68% | 4.7 |
| May | 71% | 5.5 |
| June | 77% | 6.3 |
| July | 81% | 6.3 |
| August | 79% | 5.4 |
| September | 77% | 4.3 |
| October | 65% | 2.7 |
| November | 60% | 1.7 |
| December | 50% | 1.1 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Allegan need?
A normal year in Allegan brings 6,883 heating degree days, 28% more than the median U.S. place (5,373), and 503 cooling degree days, 45% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,506 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,303 | 0 |
| February | 1,136 | 0 |
| March | 969 | 0 |
| April | 577 | 4 |
| May | 285 | 29 |
| June | 62 | 111 |
| July | 19 | 168 |
| August | 21 | 140 |
| September | 148 | 46 |
| October | 455 | 6 |
| November | 783 | 0 |
| December | 1,125 | 0 |
| Year (annual) | 6,883 | 503 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00200128. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Allegan's climate compare?
Allegan is warmer than 82 of the other 139 places with their own NOAA record in Michigan. Across the 7,247 U.S. stations with normals, its annual mean of 47.4°F is warmer than 29%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Allegan share this climate record?
6 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Wayland, MI4,543 people · 10 mi NE
- Otsego, MI4,036 people · 10 mi SE
- Dorr, MI3,952 people · 11 mi N
- Plainwell, MI3,736 people · 12 mi SE
- Hopkins, MI636 people · 3 mi NE
- Martin, MI400 people · 8 mi E
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Allegan's climate
What is the coldest month in Allegan?
January, with a normal high of 30°F and a normal low of 16°F. The warmest is July (82°F by day, 58°F at night).
Does it snow in Allegan?
Yes. NOAA publishes no 1991-2020 snowfall normal for Allegan's NOAA station; the nearest record that keeps one, Bloomingdale (16 miles away), records 109 inches of snow in a normal year.
What plant hardiness zone is Allegan in?
The USDA's 2023 map puts Allegan in zone 6a in ZIP code 49010, the nearest ZIP area.
How late can frost come in Allegan?
In half of years the last 32°F night comes after May 4; in one year in ten it comes after May 22. Waiting until May 22 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Michigan climateThe statewide normals and every place in the state
- Bloomingdale, MI16 miles from this station, 48.6°F a year
- Holland, MI19 miles from this station, 49.3°F a year
- Gull Lake Biological Station, MI24 miles from this station, 50.4°F a year
- Kentwood, MI25 miles from this station, 48.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made