Three Rivers, Michigan climate: Normal weather by month, frost dates and records
Three Rivers's normal year runs from 17°F January nights to 82°F July afternoons, with 39.7 inches of precipitation and 41 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.2°C, January lows of −8°C, July highs of 28°C, 1,007 mm of precipitation a year.
- NOAA stationThree Rivers
- Station IDUSC00208184
- Location41.93°N 85.64°W
- Elevation810 ft (247 m)
- Population7,958
On October 23, the normal high in Three Rivers is 58°F and the normal low 38°F, and the chance of measurable rain or snow is 40%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Three Rivers.
- Jan 31° 17°
- Feb 34° 18°
- Mar 45° 26°
- Apr 58° 36°
- May 69° 48°
- Jun 79° 57°
- Jul 82° 61°
- Aug 80° 59°
- Sep 74° 51°
- Oct 61° 40°
- Nov 47° 31°
- Dec 36° 23°
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 Three Rivers each month?
July is the warmest month, with normal highs of 82°F; January the coldest, with normal lows of 17°F. The most precipitation falls in May (4.40 in), the least in February (2.06 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 31°F | 17°F | 23.9°F | 2.85 | 15.0 | 15 | <1 | 29 | 9 h 30 min |
| February | 34°F | 18°F | 26.1°F | 2.06 | 9.7 | 12 | <1 | 26 | 10 h 30 min |
| March | 45°F | 26°F | 35.4°F | 2.30 | 3.7 | 11 | <1 | 24 | 11 h 50 min |
| April | 58°F | 36°F | 47.0°F | 3.35 | 0.6 | 13 | <1 | 12 | 13 h 20 min |
| May | 69°F | 48°F | 58.5°F | 4.40 | 0.0 | 13 | 1 | 1 | 14 h 30 min |
| June | 79°F | 57°F | 67.9°F | 4.10 | 0.0 | 11 | 3 | <1 | 15 h 10 min |
| July | 82°F | 61°F | 71.4°F | 3.99 | 0.0 | 10 | 5 | <1 | 15 h |
| August | 80°F | 59°F | 69.6°F | 3.95 | 0.0 | 11 | 3 | <1 | 14 h |
| September | 74°F | 51°F | 62.6°F | 3.58 | 0.0 | 10 | 1 | <1 | 12 h 30 min |
| October | 61°F | 40°F | 50.7°F | 3.69 | 0.0 | 12 | <1 | 7 | 11 h 10 min |
| November | 47°F | 31°F | 39.1°F | 3.04 | 2.9 | 13 | <1 | 19 | 9 h 50 min |
| December | 36°F | 23°F | 29.4°F | 2.35 | 9.3 | 14 | <1 | 27 | 9 h 10 min |
| Year (annual) | 58°F | 39°F | 48.5°F | 39.66 | 41.2 | 144 | 13 | 145 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −8°C | −4.5°C | 72 mm | 38 cm |
| February | 1°C | −8°C | −3.3°C | 52 mm | 25 cm |
| March | 7°C | −3°C | 1.9°C | 58 mm | 9 cm |
| April | 14°C | 2°C | 8.3°C | 85 mm | 2 cm |
| May | 21°C | 9°C | 14.7°C | 112 mm | 0 cm |
| June | 26°C | 14°C | 19.9°C | 104 mm | 0 cm |
| July | 28°C | 16°C | 21.9°C | 101 mm | 0 cm |
| August | 27°C | 15°C | 20.9°C | 100 mm | 0 cm |
| September | 23°C | 11°C | 17.0°C | 91 mm | 0 cm |
| October | 16°C | 5°C | 10.4°C | 94 mm | 0 cm |
| November | 9°C | −1°C | 3.9°C | 77 mm | 7 cm |
| December | 2°C | −5°C | −1.4°C | 60 mm | 24 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00208184; 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 Three Rivers?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, July has the fewest days with rain (10).
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 USC00208184.
When is the last frost in Three Rivers?
In Three Rivers, the last spring frost (32°F) comes after April 30 in half of years and after May 15 in one year in ten; the first autumn frost comes before October 17 in half of years and before October 1 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 301 year in 10 after May 15; 9 in 10 after April 16
- First autumn frost, half of years before
- October 171 year in 10 before October 1; 9 in 10 before November 1
NOAA puts the median frost-free season at 170 days, and the season without a hard freeze (28°F) at 194 days.
A hard freeze (28°F) comes after April 19 in half of springs and before October 31 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Three Rivers in zone 6a in ZIP code 49093, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Three Rivers's NOAA station is in zone 6a: the coldest night of a typical year reaches −8°F (25 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 USC00208184; 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 Three Rivers?
In a normal year in Three Rivers, 13 days a year reach 90°F, 145 nights fall to 32°F or colder and 144 days bring measurable precipitation.
- Days at 90°F or more
- 13a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 145a normal year
- Days that stay below freezing
- 42high of 32°F or less
- Days with 0.01 inch of precipitation
- 144a normal year
- Days with 1 inch of snow or more
- 15a normal year
The highest temperature in this station's record (since 1895) is 107°F, on July 25, 1934; the lowest is −23°F, on January 20, 1994.
The wettest calendar year on that record is 2019, with 51.84 in; the snowiest season is 2013–14, with 82.4 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00208184; records: ACIS (NOAA Regional Climate Centers), station USC00208184. Records use complete months only; a month missing more than three days is left out.
How sunny is Three Rivers?
Over a year 71% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Three Rivers, 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 | 55% | 1.5 |
| February | 60% | 2.4 |
| March | 65% | 3.5 |
| April | 69% | 4.7 |
| May | 71% | 5.4 |
| June | 77% | 6.1 |
| July | 81% | 6.2 |
| August | 80% | 5.4 |
| September | 78% | 4.4 |
| October | 69% | 2.9 |
| November | 63% | 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 Three Rivers need?
A normal year in Three Rivers brings 6,602 heating degree days, 23% more than the median U.S. place (5,373), and 615 cooling degree days, 32% 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 2,716 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,272 | 0 |
| February | 1,089 | 0 |
| March | 917 | 0 |
| April | 544 | 4 |
| May | 241 | 40 |
| June | 48 | 135 |
| July | 10 | 209 |
| August | 20 | 161 |
| September | 135 | 61 |
| October | 449 | 5 |
| November | 776 | 0 |
| December | 1,102 | 0 |
| Year (annual) | 6,602 | 615 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00208184. 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 Three Rivers been warmer than normal lately?
2025 averaged 49.7°F, 1.2°F above the 1991-2020 normal of 48.5°F. 4 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 50.6°F | +2.1°F | 44.25 | 23.9 |
| 2022 | 48.9°F | +0.4°F | 36.88 | 38.5 |
| 2023 | 51.5°F | +3.0°F | 37.94 | 19.8 |
| 2025 | 49.7°F | +1.2°F | 35.58 | 39.5 |
Over 86 complete years from 1930 to 2025, the station's annual mean temperature rose at a fitted 2.4°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 USC00208184; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Three Rivers's climate compare?
Three Rivers is warmer than 112 of the other 139 places with their own NOAA record in Michigan, and wetter than 119. Across the 7,247 U.S. stations with normals, its annual mean of 48.5°F is warmer than 34%.
In the Köppen classification computed from these normals, Three Rivers 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 Three Rivers share this climate record?
10 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.
- Middlebury, IN3,721 people · 18 mi S
- Constantine, MI2,000 people · 7 mi S
- Bristol, IN1,805 people · 18 mi SW
- Centreville, MI1,322 people · 6 mi E
- Marcellus, MI1,048 people · 11 mi NW
- Mendon, MI865 people · 11 mi NE
- Shipshewana, IN852 people · 18 mi S
- Shipshewana Lake, IN325 people · 17 mi S
- Scott, IN98 people · 14 mi S
- Vistula, IN45 people · 13 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 Three Rivers's climate
What is the coldest month in Three Rivers?
January, with a normal high of 31°F and a normal low of 17°F. The warmest is July (82°F by day, 61°F at night).
Does it snow in Three Rivers?
Yes: 41 inches in a normal year, falling on 30 days with 0.1 inch or more, the most in January (15.0 inches).
What is the rainiest month in Three Rivers?
May, with 4.40 in of precipitation in a normal year; the driest is February with 2.06 in.
What plant hardiness zone is Three Rivers in?
The USDA's 2023 map puts Three Rivers in zone 6a in ZIP code 49093, the nearest ZIP area. By the same method at Three Rivers's NOAA station, the coldest night of a typical year reaches −8°F (25 years, 1991-2020): zone 6a.
How late can frost come in Three Rivers?
In half of years the last 32°F night comes after April 30; in one year in ten it comes after May 15. Waiting until May 15 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Michigan climateThe statewide normals and every place in the state
- Kalamazoo, MI22 miles from this station, 49.5°F a year
- Lagrange, IN23 miles from this station, 49.3°F a year
- Dowagiac, MI25 miles from this station, 48.1°F a year
- Goshen, IN29 miles from this station, 50.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made