Amasa, Michigan climate: Normal weather by month, frost dates and records
Amasa's normal year runs from 0°F January nights to 79°F July afternoons, with 31.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 3.8°C, January lows of −18°C, July highs of 26°C, 796 mm of precipitation a year.
- NOAA stationAmasa (1 mi W)
- Station IDUSC00200197
- Location46.23°N 88.45°W
- Elevation1,470 ft (448 m)
- Population (census place)262
On October 23, the normal high in Amasa is 50°F and the normal low 28°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Amasa.
- Jan 22° 0°
- Feb 26° 0°
- Mar 37° 10°
- Apr 50° 24°
- May 65° 37°
- Jun 74° 46°
- Jul 79° 51°
- Aug 76° 49°
- Sep 68° 42°
- Oct 54° 31°
- Nov 39° 21°
- Dec 27° 8°
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 Amasa each month?
July is the warmest month, with normal highs of 79°F; January the coldest, with normal lows of 0°F. The most precipitation falls in July (3.89 in), the least in February (1.11 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 22°F | 0°F | 10.9°F | 1.32 | – | <1 | 31 | 9 h |
| February | 26°F | 0°F | 13.1°F | 1.11 | – | <1 | 28 | 10 h 20 min |
| March | 37°F | 10°F | 23.6°F | 1.73 | – | <1 | 29 | 11 h 50 min |
| April | 50°F | 24°F | 36.9°F | 2.78 | – | <1 | 25 | 13 h 30 min |
| May | 65°F | 37°F | 50.8°F | 3.07 | – | <1 | 10 | 15 h |
| June | 74°F | 46°F | 60.1°F | 3.57 | – | 1 | 1 | 15 h 50 min |
| July | 79°F | 51°F | 64.6°F | 3.89 | – | 2 | <1 | 15 h 30 min |
| August | 76°F | 49°F | 62.4°F | 3.20 | – | 1 | <1 | 14 h 10 min |
| September | 68°F | 42°F | 55.0°F | 3.63 | – | <1 | 4 | 12 h 40 min |
| October | 54°F | 31°F | 42.2°F | 3.27 | – | <1 | 18 | 11 h |
| November | 39°F | 21°F | 29.5°F | 2.14 | – | <1 | 26 | 9 h 30 min |
| December | 27°F | 8°F | 17.5°F | 1.64 | – | <1 | 31 | 8 h 40 min |
| Year (annual) | 51°F | 27°F | 38.9°F | 31.35 | – | 4 | 203 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −6°C | −18°C | −11.7°C | 34 mm |
| February | −3°C | −18°C | −10.5°C | 28 mm |
| March | 3°C | −12°C | −4.7°C | 44 mm |
| April | 10°C | −4°C | 2.7°C | 71 mm |
| May | 18°C | 3°C | 10.4°C | 78 mm |
| June | 23°C | 8°C | 15.6°C | 91 mm |
| July | 26°C | 10°C | 18.1°C | 99 mm |
| August | 25°C | 9°C | 16.9°C | 81 mm |
| September | 20°C | 5°C | 12.8°C | 92 mm |
| October | 12°C | −1°C | 5.7°C | 83 mm |
| November | 4°C | −6°C | −1.4°C | 54 mm |
| December | −3°C | −13°C | −8.1°C | 42 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Stambaugh (2 mi SSE) (15 miles away), gets 67 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00200197; 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 Amasa?
Normal highs sit between 65°F and 85°F in 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 USC00200197.
When is the last frost in Amasa?
In Amasa, the last spring frost (32°F) comes after June 6 in half of years and after July 7 in one year in ten; the first autumn frost comes before September 9 in half of years and before August 20 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
- June 61 year in 10 after July 7; 9 in 10 after May 23
- First autumn frost, half of years before
- September 91 year in 10 before August 20; 9 in 10 before September 27
NOAA puts the median frost-free season at 94 days, and the season without a hard freeze (28°F) at 124 days.
A hard freeze (28°F) comes after May 24 in half of springs and before September 25 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Amasa in zone 4a in ZIP code 49903, 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 USC00200197; 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 Amasa?
In a normal year in Amasa, 4 days a year reach 90°F and 203 nights fall to 32°F or colder.
- Days at 90°F or more
- 4a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 203a normal year
- Days that stay below freezing
- 93high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00200197.
How sunny is Amasa?
Over a year 69% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Amasa, 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 much heating and cooling does Amasa need?
A normal year in Amasa brings 9,658 heating degree days, 80% more than the median U.S. place (5,373), and 175 cooling degree days, 81% 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 1,526 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,679 | 0 |
| February | 1,452 | 0 |
| March | 1,285 | 0 |
| April | 845 | 0 |
| May | 447 | 7 |
| June | 181 | 32 |
| July | 88 | 77 |
| August | 126 | 45 |
| September | 313 | 13 |
| October | 707 | 1 |
| November | 1,064 | 0 |
| December | 1,472 | 0 |
| Year (annual) | 9,658 | 175 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00200197. 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 Amasa been warmer than normal lately?
2025 averaged 41.1°F, 2.2°F above the 1991-2020 normal of 38.9°F. 4 of the 4 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2022 | 39.5°F | +0.6°F | 32.11 |
| 2023 | 42.1°F | +3.2°F | 27.59 |
| 2024 | 44.2°F | +5.3°F | 29.12 |
| 2025 | 41.1°F | +2.2°F | 40.24 |
Source: observed years: ACIS, station USC00200197. A year counts only with all twelve months complete.
How does Amasa's climate compare?
Amasa is warmer than 0 of the other 139 places with their own NOAA record in Michigan, and wetter than 18. Across the 7,247 U.S. stations with normals, its annual mean of 38.9°F is warmer than 4%.
In the Köppen classification computed from these normals, Amasa 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.
Questions about Amasa's climate
What is the coldest month in Amasa?
January, with a normal high of 22°F and a normal low of 0°F. The warmest is July (79°F by day, 51°F at night).
Does it snow in Amasa?
Yes. NOAA publishes no 1991-2020 snowfall normal for Amasa's NOAA station; the nearest record that keeps one, Stambaugh (2 mi SSE) (15 miles away), records 67 inches of snow in a normal year.
What is the rainiest month in Amasa?
July, with 3.89 in of precipitation in a normal year; the driest is February with 1.11 in.
What plant hardiness zone is Amasa in?
The USDA's 2023 map puts Amasa in zone 4a in ZIP code 49903, the nearest ZIP area.
How late can frost come in Amasa?
In half of years the last 32°F night comes after June 6; in one year in ten it comes after July 7. Waiting until July 7 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Michigan climateThe statewide normals and every place in the state
- Stambaugh (2 mi SSE), MI15 miles from this station, 38.5°F a year
- Watton (2 mi WSW), MI22 miles from this station, 40.4°F a year
- Covington, MI23 miles from this station, 40.4°F a year
- Florence, WI23 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