Mio, Michigan climate: Normal weather by month, frost dates and records
Mio's normal year runs from 12°F January nights to 81°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.2°C, January lows of −11°C, July highs of 27°C.
- NOAA stationMio Hydro Plant
- Station IDUSC00205531
- Location44.66°N 84.13°W
- Elevation960 ft (293 m)
- Population (census place)1,504
On October 14, the normal high in Mio is 59°F and the normal low 38°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Mio.
- Jan 29° 12°
- Feb 32° 11°
- Mar 42° 20°
- Apr 54° 30°
- May 67° 41°
- Jun 77° 52°
- Jul 81° 56°
- Aug 80° 55°
- Sep 72° 47°
- Oct 59° 38°
- Nov 45° 29°
- Dec 34° 19°
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 Mio each month?
July is the warmest month, with normal highs of 81°F; January the coldest, with normal lows of 12°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 29°F | 12°F | 20.1°F | – | <1 | 30 | 9 h 10 min |
| February | 32°F | 11°F | 21.4°F | – | <1 | 27 | 10 h 20 min |
| March | 42°F | 20°F | 30.7°F | – | <1 | 28 | 11 h 50 min |
| April | 54°F | 30°F | 41.8°F | – | <1 | 19 | 13 h 30 min |
| May | 67°F | 41°F | 54.1°F | – | <1 | 6 | 14 h 50 min |
| June | 77°F | 52°F | 64.4°F | – | 2 | <1 | 15 h 30 min |
| July | 81°F | 56°F | 68.7°F | – | 3 | <1 | 15 h 20 min |
| August | 80°F | 55°F | 67.4°F | – | 2 | <1 | 14 h 10 min |
| September | 72°F | 47°F | 59.5°F | – | 1 | 2 | 12 h 40 min |
| October | 59°F | 38°F | 48.0°F | – | <1 | 11 | 11 h |
| November | 45°F | 29°F | 36.6°F | – | <1 | 22 | 9 h 40 min |
| December | 34°F | 19°F | 26.7°F | – | <1 | 28 | 8 h 50 min |
| Year (annual) | 56°F | 34°F | 44.9°F | – | 8 | 174 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | −2°C | −11°C | −6.6°C |
| February | 0°C | −11°C | −5.9°C |
| March | 5°C | −7°C | −0.7°C |
| April | 12°C | −1°C | 5.4°C |
| May | 20°C | 5°C | 12.3°C |
| June | 25°C | 11°C | 18.0°C |
| July | 27°C | 13°C | 20.4°C |
| August | 27°C | 13°C | 19.7°C |
| September | 22°C | 8°C | 15.3°C |
| October | 15°C | 3°C | 8.9°C |
| November | 7°C | −2°C | 2.6°C |
| December | 1°C | −7°C | −2.9°C |
NOAA publishes no 1991-2020 snowfall normal for this station. Mio's own co-op station Mio Wastewater Treatment Plant does: 57 inches of snow in a normal year (see the other stations below).
Source: NOAA NCEI 1991-2020 monthly normals, station USC00205531; 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 Mio?
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 USC00205531.
When is the last frost in Mio?
In Mio, the last spring frost (32°F) comes after May 19 in half of years and after May 31 in one year in ten; the first autumn frost comes before October 2 in half of years and before September 17 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 191 year in 10 after May 31; 9 in 10 after May 1
- First autumn frost, half of years before
- October 21 year in 10 before September 17; 9 in 10 before October 17
NOAA puts the median frost-free season at 136 days, and the season without a hard freeze (28°F) at 162 days.
A hard freeze (28°F) comes after May 5 in half of springs and before October 15 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Mio in zone 5a in ZIP code 48647, 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 USC00205531; 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 Mio?
In a normal year in Mio, 8 days a year reach 90°F and 174 nights fall to 32°F or colder.
- Days at 90°F or more
- 8a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 174a normal year
- Days that stay below freezing
- 56high of 32°F or less
The highest temperature in this station's record (since 1887) is 112°F, on July 13, 1936; the lowest is −47°F, on February 1, 1918.
The wettest calendar year on that record is 1897, with 36.70 in; the snowiest season is 1970–71, with 102.2 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00205531; records: ACIS (NOAA Regional Climate Centers), station USC00205531. Records use complete months only; a month missing more than three days is left out.
How sunny is Mio?
Over a year 70% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Mio, 3.7 kWh per square metre a day. July is the sunniest month (79%) and December the cloudiest (50%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 54% | 1.3 |
| February | 62% | 2.3 |
| March | 67% | 3.5 |
| April | 68% | 4.6 |
| May | 70% | 5.5 |
| June | 75% | 6.2 |
| July | 79% | 6.2 |
| August | 77% | 5.3 |
| September | 75% | 4.1 |
| October | 63% | 2.5 |
| November | 56% | 1.5 |
| December | 50% | 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 Mio need?
A normal year in Mio brings 7,669 heating degree days, 43% more than the median U.S. place (5,373), and 399 cooling degree days, 56% 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 2,146 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,390 | 0 |
| February | 1,221 | 0 |
| March | 1,063 | 0 |
| April | 697 | 1 |
| May | 359 | 22 |
| June | 101 | 81 |
| July | 29 | 142 |
| August | 43 | 117 |
| September | 198 | 33 |
| October | 530 | 3 |
| November | 852 | 0 |
| December | 1,186 | 0 |
| Year (annual) | 7,669 | 399 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00205531. 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 Mio's climate compare?
Mio is warmer than 44 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 44.9°F is warmer than 19%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
What do Mio's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Mio. This page uses Mio Hydro Plant; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Mio Wastewater Treatment Plant USC00205533 | 1 mi SE | 1,037 ft | 44.4°F | 11°F | 81°F | 32.0 | 57 | May 20 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Mio's climate
What is the coldest month in Mio?
January, with a normal high of 29°F and a normal low of 12°F. The warmest is July (81°F by day, 56°F at night).
Does it snow in Mio?
Yes. NOAA publishes no 1991-2020 snowfall normal for Mio's NOAA station; Mio's own co-op station Mio Wastewater Treatment Plant records 57 inches of snow in a normal year.
What plant hardiness zone is Mio in?
The USDA's 2023 map puts Mio in zone 5a in ZIP code 48647, the nearest ZIP area.
How late can frost come in Mio?
In half of years the last 32°F night comes after May 19; in one year in ten it comes after May 31. Waiting until May 31 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Michigan climateThe statewide normals and every place in the state
- Lupton, MI17 miles from this station, 43.7°F a year
- Glennie (2 mi SE), MI23 miles from this station, 42.9°F a year
- Atlanta, MI24 miles from this station, 43.4°F a year
- Hale Loud Dam, MI24 miles from this station, 44.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made