Monroe, Michigan climate: Normal weather by month, frost dates and records
Monroe's normal year runs from 18°F January nights to 85°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.9°C, January lows of −8°C, July highs of 29°C.
- NOAA stationMonroe
- Station IDUSC00205563
- Location41.91°N 83.42°W
- Elevation586 ft (179 m)
- Population20,177
On October 23, the normal high in Monroe is 60°F and the normal low 40°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Monroe.
- Jan 33° 18°
- Feb 35° 19°
- Mar 45° 27°
- Apr 58° 38°
- May 69° 49°
- Jun 80° 59°
- Jul 85° 63°
- Aug 82° 61°
- Sep 75° 54°
- Oct 63° 42°
- Nov 49° 33°
- Dec 38° 24°
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 Monroe each month?
July is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 18°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 33°F | 18°F | 25.4°F | – | <1 | 28 | 9 h 30 min |
| February | 35°F | 19°F | 27.3°F | – | <1 | 26 | 10 h 30 min |
| March | 45°F | 27°F | 35.9°F | – | <1 | 22 | 11 h 50 min |
| April | 58°F | 38°F | 47.8°F | – | <1 | 7 | 13 h 20 min |
| May | 69°F | 49°F | 59.3°F | – | <1 | 1 | 14 h 30 min |
| June | 80°F | 59°F | 69.6°F | – | 3 | <1 | 15 h 10 min |
| July | 85°F | 63°F | 73.5°F | – | 7 | <1 | 15 h |
| August | 82°F | 61°F | 71.3°F | – | 3 | <1 | 14 h |
| September | 75°F | 54°F | 64.4°F | – | 1 | <1 | 12 h 30 min |
| October | 63°F | 42°F | 52.6°F | – | <1 | 3 | 11 h 10 min |
| November | 49°F | 33°F | 40.9°F | – | <1 | 16 | 9 h 50 min |
| December | 38°F | 24°F | 30.7°F | – | <1 | 26 | 9 h 10 min |
| Year (annual) | 59°F | 41°F | 49.9°F | – | 14 | 128 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 0°C | −8°C | −3.7°C |
| February | 2°C | −7°C | −2.6°C |
| March | 7°C | −3°C | 2.2°C |
| April | 14°C | 3°C | 8.8°C |
| May | 21°C | 10°C | 15.2°C |
| June | 27°C | 15°C | 20.9°C |
| July | 29°C | 17°C | 23.1°C |
| August | 28°C | 16°C | 21.8°C |
| September | 24°C | 12°C | 18.0°C |
| October | 17°C | 6°C | 11.4°C |
| November | 10°C | 0°C | 4.9°C |
| December | 3°C | −5°C | −0.7°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Newport (4 mi SSE) (8 miles away), gets 41 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00205563; 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 Monroe?
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 USC00205563.
When is the last frost in Monroe?
In Monroe, the last spring frost (32°F) comes after April 23 in half of years and after May 7 in one year in ten; the first autumn frost comes before October 23 in half of years and before October 9 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
- April 231 year in 10 after May 7; 9 in 10 after April 8
- First autumn frost, half of years before
- October 231 year in 10 before October 9; 9 in 10 before November 5
NOAA puts the median frost-free season at 182 days, and the season without a hard freeze (28°F) at 204 days.
A hard freeze (28°F) comes after April 14 in half of springs and before November 4 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Monroe in zone 6b in ZIP code 48162.
Frost dates for every NOAA station in Michigan · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00205563; 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 Monroe?
In a normal year in Monroe, 14 days a year reach 90°F and 128 nights fall to 32°F or colder.
- Days at 90°F or more
- 14a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 128a normal year
- Days that stay below freezing
- 42high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00205563.
How sunny is Monroe?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Monroe, 3.8 kWh per square metre a day. July is the sunniest month (81%) and December the cloudiest (55%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 56% | 1.6 |
| February | 62% | 2.5 |
| March | 64% | 3.5 |
| April | 69% | 4.7 |
| May | 71% | 5.5 |
| June | 77% | 6.2 |
| July | 81% | 6.2 |
| August | 80% | 5.4 |
| September | 78% | 4.4 |
| October | 69% | 2.9 |
| November | 65% | 1.9 |
| December | 55% | 1.3 |
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 Monroe need?
A normal year in Monroe brings 6,240 heating degree days, 16% more than the median U.S. place (5,373), and 770 cooling degree days, 15% 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 2,979 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,226 | 0 |
| February | 1,056 | 0 |
| March | 904 | 1 |
| April | 518 | 3 |
| May | 215 | 39 |
| June | 30 | 168 |
| July | 4 | 267 |
| August | 11 | 204 |
| September | 97 | 79 |
| October | 393 | 9 |
| November | 723 | 0 |
| December | 1,063 | 0 |
| Year (annual) | 6,240 | 770 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00205563. 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 Monroe's climate compare?
Monroe is warmer than 135 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 49.9°F is warmer than 40%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Monroe share this climate record?
12 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.
- Oregon, OH19,726 people · 17 mi S
- South Monroe, MI6,771 people · 1 mi S
- Northwood, OH5,222 people · 21 mi S
- Walbridge, OH3,058 people · 22 mi S
- West Monroe, MI2,753 people · 1 mi NW
- Curtice, OH1,533 people · 20 mi S
- Luna Pier, MI1,357 people · 7 mi S
- Millbury, OH1,205 people · 24 mi S
- Reno Beach, OH544 people · 19 mi SE
- Williston, OH260 people · 21 mi S
- Clay Center, OH248 people · 23 mi S
- Harbor View, OH89 people · 15 mi S
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 Monroe's climate
What is the coldest month in Monroe?
January, with a normal high of 33°F and a normal low of 18°F. The warmest is July (85°F by day, 63°F at night).
Does it snow in Monroe?
Yes. NOAA publishes no 1991-2020 snowfall normal for Monroe's NOAA station; the nearest record that keeps one, Newport (4 mi SSE) (8 miles away), records 41 inches of snow in a normal year.
What plant hardiness zone is Monroe in?
The USDA's 2023 map puts Monroe in zone 6b in ZIP code 48162.
How late can frost come in Monroe?
In half of years the last 32°F night comes after April 23; in one year in ten it comes after May 7. Waiting until May 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
- Newport (4 mi SSE), MI7 miles from this station, 49.2°F a year
- Carleton, MI11 miles from this station, 49.5°F a year
- Dundee, MI12 miles from this station, 49.4°F a year
- Milan, MI18 miles from this station, 49.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made