Hart, Michigan climate: Normal weather by month, frost dates and records
Hart's normal year runs from 16°F January nights to 80°F July afternoons, with 38.9 inches of precipitation and 79 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.9°C, January lows of −9°C, July highs of 27°C, 988 mm of precipitation a year.
- NOAA stationHart (3 mi WSW)
- Station IDUSC00203632
- Location43.67°N 86.42°W
- Elevation770 ft (235 m)
- Population2,059
On October 23, the normal high in Hart is 56°F and the normal low 37°F, and the chance of measurable rain or snow is 43%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hart.
- Jan 30° 16°
- Feb 32° 16°
- Mar 42° 23°
- Apr 55° 33°
- May 67° 43°
- Jun 76° 54°
- Jul 80° 58°
- Aug 79° 57°
- Sep 72° 50°
- Oct 59° 39°
- Nov 45° 30°
- 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 Hart each month?
July is the warmest month, with normal highs of 80°F; January the coldest, with normal lows of 16°F. The most precipitation falls in May (4.45 in), the least in February (1.96 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 30°F | 16°F | 22.9°F | 2.75 | 26.4 | 16 | <1 | 29 | 9 h 20 min |
| February | 32°F | 16°F | 24.1°F | 1.96 | 20.0 | 13 | <1 | 26 | 10 h 30 min |
| March | 42°F | 23°F | 32.4°F | 2.37 | 5.9 | 9 | <1 | 26 | 11 h 50 min |
| April | 55°F | 33°F | 43.8°F | 3.63 | 1.1 | 12 | <1 | 14 | 13 h 20 min |
| May | 67°F | 43°F | 54.8°F | 4.45 | 0.0 | 11 | <1 | 3 | 14 h 40 min |
| June | 76°F | 54°F | 64.8°F | 3.72 | 0.0 | 10 | <1 | <1 | 15 h 30 min |
| July | 80°F | 58°F | 68.8°F | 3.53 | 0.0 | 9 | 2 | <1 | 15 h 10 min |
| August | 79°F | 57°F | 67.6°F | 3.27 | 0.0 | 8 | 1 | <1 | 14 h |
| September | 72°F | 50°F | 60.8°F | 3.23 | 0.0 | 10 | <1 | 1 | 12 h 30 min |
| October | 59°F | 39°F | 49.0°F | 3.96 | 0.1 | 13 | <1 | 7 | 11 h 10 min |
| November | 45°F | 30°F | 37.7°F | 3.43 | 5.4 | 13 | <1 | 19 | 9 h 40 min |
| December | 35°F | 22°F | 28.4°F | 2.60 | 19.6 | 14 | <1 | 27 | 9 h |
| Year (annual) | 56°F | 37°F | 46.3°F | 38.90 | 78.5 | 137 | 3 | 151 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −1°C | −9°C | −5.1°C | 70 mm | 67 cm |
| February | 0°C | −9°C | −4.4°C | 50 mm | 51 cm |
| March | 6°C | −5°C | 0.2°C | 60 mm | 15 cm |
| April | 13°C | 1°C | 6.6°C | 92 mm | 3 cm |
| May | 19°C | 6°C | 12.7°C | 113 mm | 0 cm |
| June | 24°C | 12°C | 18.2°C | 94 mm | 0 cm |
| July | 27°C | 14°C | 20.4°C | 90 mm | 0 cm |
| August | 26°C | 14°C | 19.8°C | 83 mm | 0 cm |
| September | 22°C | 10°C | 16.0°C | 82 mm | 0 cm |
| October | 15°C | 4°C | 9.4°C | 101 mm | 0 cm |
| November | 7°C | −1°C | 3.2°C | 87 mm | 14 cm |
| December | 1°C | −5°C | −2.0°C | 66 mm | 50 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00203632; 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 Hart?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, August has the fewest days with rain (8).
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 USC00203632.
When is the last frost in Hart?
In Hart, the last spring frost (32°F) comes after May 12 in half of years and after May 28 in one year in ten; the first autumn frost comes before October 10 in half of years and before September 25 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 121 year in 10 after May 28; 9 in 10 after April 25
- First autumn frost, half of years before
- October 101 year in 10 before September 25; 9 in 10 before October 26
NOAA puts the median frost-free season at 151 days, and the season without a hard freeze (28°F) at 174 days.
A hard freeze (28°F) comes after April 30 in half of springs and before October 25 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hart in zone 6a in ZIP code 49420, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Hart's NOAA station is in zone 6a: the coldest night of a typical year reaches −6°F (22 complete years).
Frost dates for every NOAA station in Michigan · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00203632; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. 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 Hart?
In a normal year in Hart, 3 days a year reach 90°F, 151 nights fall to 32°F or colder and 137 days bring measurable precipitation.
- Days at 90°F or more
- 3a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 151a normal year
- Days that stay below freezing
- 55high of 32°F or less
- Days with 0.01 inch of precipitation
- 137a normal year
- Days with 1 inch of snow or more
- 29a normal year
The highest temperature in this station's record (since 1893) is 104°F, on July 13, 1936; the lowest is −35°F, on February 11, 1899.
The wettest calendar year on that record is 1975, with 48.17 in; the snowiest season is 2008–09, with 171.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00203632; records: ACIS (NOAA Regional Climate Centers), station USC00203632. Records use complete months only; a month missing more than three days is left out.
How sunny is Hart?
Over a year 70% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Hart, 3.7 kWh per square metre a day. July is the sunniest month (81%) and December the cloudiest (46%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 47% | 1.2 |
| February | 55% | 2.1 |
| March | 66% | 3.5 |
| April | 69% | 4.7 |
| May | 72% | 5.6 |
| June | 76% | 6.2 |
| July | 81% | 6.3 |
| August | 80% | 5.4 |
| September | 77% | 4.2 |
| October | 65% | 2.6 |
| November | 57% | 1.6 |
| December | 46% | 1.0 |
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 Hart need?
A normal year in Hart brings 7,210 heating degree days, 34% more than the median U.S. place (5,373), and 415 cooling degree days, 54% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,267 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,307 | 0 |
| February | 1,145 | 0 |
| March | 1,011 | 1 |
| April | 636 | 0 |
| May | 333 | 19 |
| June | 84 | 80 |
| July | 30 | 147 |
| August | 39 | 119 |
| September | 173 | 46 |
| October | 501 | 3 |
| November | 818 | 0 |
| December | 1,135 | 0 |
| Year (annual) | 7,210 | 415 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00203632. 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.
Has Hart been warmer than normal lately?
2025 averaged 47.4°F, 1.1°F above the 1991-2020 normal of 46.3°F. 3 of the 3 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2022 | 47.0°F | +0.7°F | 41.13 | 97.3 |
| 2024 | 49.9°F | +3.6°F | – | 65.2 |
| 2025 | 47.4°F | +1.1°F | 31.93 | 120.7 |
Over 97 complete years from 1888 to 2025, the station's annual mean temperature rose at a fitted 2.3°F per century (+0.13°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00203632; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Hart's climate compare?
Hart is warmer than 59 of the other 139 places with their own NOAA record in Michigan, and wetter than 112. Across the 7,247 U.S. stations with normals, its annual mean of 46.3°F is warmer than 25%.
In the Köppen classification computed from these normals, Hart is Dfb: continental, no dry season, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Hart share this climate record?
3 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.
- Shelby, MI2,176 people · 5 mi SE
- Pentwater, MI899 people · 7 mi N
- Mears, MI189 people · 1 mi N
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 Hart's climate
What is the coldest month in Hart?
January, with a normal high of 30°F and a normal low of 16°F. The warmest is July (80°F by day, 58°F at night).
Does it snow in Hart?
Yes: 79 inches in a normal year, falling on 40 days with 0.1 inch or more, the most in January (26.4 inches).
What is the rainiest month in Hart?
May, with 4.45 in of precipitation in a normal year; the driest is February with 1.96 in.
What plant hardiness zone is Hart in?
The USDA's 2023 map puts Hart in zone 6a in ZIP code 49420, the nearest ZIP area. By the same method at Hart's NOAA station, the coldest night of a typical year reaches −6°F (22 years, 1991-2020): zone 6a.
How late can frost come in Hart?
In half of years the last 32°F night comes after May 12; in one year in ten it comes after May 28. Waiting until May 28 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Michigan climateThe statewide normals and every place in the state
- Montague, MI15 miles from this station, 47.0°F a year
- Ludington, MI16 miles from this station, 46.0°F a year
- Hesperia, MI17 miles from this station, 46.1°F a year
- Fremont, MI25 miles from this station, 46.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made