Herman, Michigan climate: Climate normals at a NOAA weather station
Herman's normal year runs from 7°F January nights to 75°F July afternoons, with 38.3 inches of precipitation and 208 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 4.1°C, January lows of −14°C, July highs of 24°C, 972 mm of precipitation a year.
- NOAA stationHerman
- Station IDUSC00203744
- Location46.67°N 88.38°W
- Elevation1,717 ft (523 m)
On October 23, the normal high in Herman is 47°F and the normal low 32°F, and the chance of measurable rain or snow is 54%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Herman.
- Jan 19° 7°
- Feb 23° 7°
- Mar 34° 14°
- Apr 47° 26°
- May 62° 39°
- Jun 71° 49°
- Jul 75° 54°
- Aug 73° 52°
- Sep 65° 46°
- Oct 50° 35°
- Nov 36° 23°
- Dec 24° 13°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Herman each month?
July is the warmest month, with normal highs of 75°F; January the coldest, with normal lows of 7°F. The most precipitation falls in July (4.58 in), the least in February (1.82 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 19°F | 7°F | 12.9°F | 2.21 | 47.8 | 18 | <1 | 31 | 9 h |
| February | 23°F | 7°F | 15.0°F | 1.82 | 35.0 | 14 | <1 | 28 | 10 h 20 min |
| March | 34°F | 14°F | 24.1°F | 2.28 | 27.8 | 13 | <1 | 29 | 11 h 50 min |
| April | 47°F | 26°F | 36.5°F | 2.87 | 16.4 | 13 | <1 | 24 | 13 h 30 min |
| May | 62°F | 39°F | 50.7°F | 3.40 | 2.2 | 13 | <1 | 10 | 15 h |
| June | 71°F | 49°F | 60.0°F | 3.50 | 0.0 | 12 | <1 | 1 | 15 h 50 min |
| July | 75°F | 54°F | 64.2°F | 4.58 | 0.0 | 13 | <1 | <1 | 15 h 30 min |
| August | 73°F | 52°F | 62.4°F | 3.29 | 0.0 | 12 | <1 | <1 | 14 h 20 min |
| September | 65°F | 46°F | 55.1°F | 4.19 | 0.2 | 14 | <1 | 3 | 12 h 40 min |
| October | 50°F | 35°F | 42.7°F | 4.39 | 8.0 | 16 | <1 | 16 | 11 h |
| November | 36°F | 23°F | 29.3°F | 3.00 | 28.7 | 17 | <1 | 26 | 9 h 30 min |
| December | 24°F | 13°F | 18.6°F | 2.73 | 41.7 | 18 | <1 | 31 | 8 h 40 min |
| Year (annual) | 48°F | 30°F | 39.3°F | 38.26 | 207.8 | 174 | 1 | 199 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −7°C | −14°C | −10.6°C | 56 mm | 121 cm |
| February | −5°C | −14°C | −9.4°C | 46 mm | 89 cm |
| March | 1°C | −10°C | −4.4°C | 58 mm | 71 cm |
| April | 8°C | −3°C | 2.5°C | 73 mm | 42 cm |
| May | 17°C | 4°C | 10.4°C | 86 mm | 6 cm |
| June | 22°C | 10°C | 15.6°C | 89 mm | 0 cm |
| July | 24°C | 12°C | 17.9°C | 116 mm | 0 cm |
| August | 23°C | 11°C | 16.9°C | 84 mm | 0 cm |
| September | 18°C | 8°C | 12.8°C | 106 mm | 1 cm |
| October | 10°C | 2°C | 5.9°C | 112 mm | 20 cm |
| November | 2°C | −5°C | −1.5°C | 76 mm | 73 cm |
| December | −4°C | −11°C | −7.4°C | 69 mm | 106 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00203744; 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.
Which months are mildest at Herman?
Normal highs sit between 65°F and 85°F in June, July and August. Of those, August has the fewest days with rain (12).
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 USC00203744.
When is the last frost at Herman?
In Herman, the last spring frost (32°F) comes after May 31 in half of years and after June 17 in one year in ten; the first autumn frost comes before September 22 in half of years and before September 4 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 311 year in 10 after June 17; 9 in 10 after May 12
- First autumn frost, half of years before
- September 221 year in 10 before September 4; 9 in 10 before October 9
NOAA puts the median frost-free season at 115 days, and the season without a hard freeze (28°F) at 143 days.
A hard freeze (28°F) comes after May 14 in half of springs and before October 6 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Herman in zone 5a in ZIP code 49946, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 4b: the coldest night of a typical year reaches −23°F (25 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Michigan · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00203744; 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 at Herman?
In a normal year in Herman, 1 day a year reaches 90°F, 199 nights fall to 32°F or colder and 174 days bring measurable precipitation.
- Days at 90°F or more
- 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 199a normal year
- Days that stay below freezing
- 104high of 32°F or less
- Days with 0.01 inch of precipitation
- 174a normal year
- Days with 1 inch of snow or more
- 63a normal year
The highest temperature in this station's record (since 1968) is 96°F, on June 27, 1971; the lowest is −40°F, on February 17, 1979.
The wettest calendar year on that record is 2017, with 57.77 in; the snowiest season is 1996–97, with 384.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00203744; records: ACIS (NOAA Regional Climate Centers), station USC00203744. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Herman?
Over a year 69% of the sunlight that would reach the ground under clear skies gets through the clouds at Herman, 3.6 kWh per square metre a day. July is the sunniest month (78%) and December the cloudiest (50%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 56% | 1.3 |
| February | 63% | 2.2 |
| March | 68% | 3.5 |
| April | 67% | 4.5 |
| May | 69% | 5.4 |
| June | 73% | 6.0 |
| July | 78% | 6.2 |
| August | 75% | 5.1 |
| September | 71% | 3.8 |
| October | 61% | 2.3 |
| November | 54% | 1.3 |
| December | 50% | 0.9 |
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 many heating and cooling degree days does Herman record?
A normal year at Herman brings 9,518 heating degree days, 77% more than the median U.S. place (5,373), and 187 cooling degree days, 79% fewer than the median (908). Nine months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,543 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,615 | 0 |
| February | 1,400 | 0 |
| March | 1,268 | 0 |
| April | 854 | 0 |
| May | 454 | 12 |
| June | 187 | 37 |
| July | 97 | 71 |
| August | 130 | 49 |
| September | 311 | 16 |
| October | 693 | 1 |
| November | 1,071 | 0 |
| December | 1,438 | 0 |
| Year (annual) | 9,518 | 187 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00203744. 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.
Have recent years at Herman been warmer than normal?
2025 averaged 39.5°F, 0.2°F above the 1991-2020 normal of 39.3°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 41.6°F | +2.3°F | 36.14 | 162.0 |
| 2022 | 38.1°F | −1.2°F | 48.87 | 265.5 |
| 2023 | 41.2°F | +1.9°F | 44.19 | 227.5 |
| 2024 | 42.5°F | +3.2°F | 44.49 | 212.6 |
| 2025 | 39.5°F | +0.2°F | 49.56 | 291.5 |
Over 34 complete years from 1969 to 2025, the station's annual mean temperature rose at a fitted 4.9°F per century (+0.27°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00203744; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Herman's climate compare?
Herman is warmer than 1 of the 140 places with their own NOAA record in Michigan, and wetter than 110. Across the 7,247 U.S. stations with normals, its annual mean of 39.3°F is warmer than 5%.
In the Köppen classification computed from these normals, Herman 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 Herman share this climate record?
2 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.
- L'Anse, MI1,916 people · 7 mi NW
- Zeba, MI353 people · 9 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 Herman's climate
What is the coldest month at Herman?
January, with a normal high of 19°F and a normal low of 7°F. The warmest is July (75°F by day, 54°F at night).
Does it snow at Herman?
Yes: 208 inches in a normal year, falling on 86 days with 0.1 inch or more, the most in January (47.8 inches).
What is the rainiest month at Herman?
July, with 4.58 in of precipitation in a normal year; the driest is February with 1.82 in.
What plant hardiness zone is Herman in?
The USDA's 2023 map puts Herman in zone 5a in ZIP code 49946, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −23°F (25 years, 1991-2020): zone 4b.
How late can frost come at Herman?
In half of years the last 32°F night comes after May 31; in one year in ten it comes after June 17. Waiting until June 17 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Michigan climateThe statewide normals and every place in the state
- Alberta Ford Forestry Center, MI5 miles from this station, 40.9°F a year
- Covington, MI11 miles from this station, 40.4°F a year
- Baraga, MI16 miles from this station, 41.0°F a year
- Watton (2 mi WSW), MI16 miles from this station, 40.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made