Photo: Aaron Smith · CC BY-SA 3.0Three Rivers’ winters are colder and snowier than most of the U.S.
A typical July afternoon reaches 83°, a January night drops to 17°, and about 41 inches of snow falls in a normal winter.
A year in Three Rivers at a glance
Each month’s typical high and low, and what it brings.
What stands out about Three Rivers’ climate
Compared with towns across the U.S., with Three Rivers’ place in Michigan beside it.
What a year in Three Rivers feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 170 frost-free days a year
In half of years the last 32° night comes by April 30 and the first by October 17. Frost and day counts come from NOAA’s station at Three Rivers, MI, 1.2 miles from the town’s center, at about the same height.
The 2023 USDA map puts Three Rivers’ center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −8°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 41 inches of snow a winter
Snow, measured at Three Rivers, MI, falls mostly in January. Precipitation (rain plus melted snow) adds up to 38 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 144 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Three Rivers
91% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Three Rivers, MI.
Living with Three Rivers’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
170 frost-free days in zone 6a. The last frost comes by Apr 30 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 17.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October. 1.7 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Three Rivers from natural hazards, river flooding is the largest share (67%); heat waves, cold waves, winter storms and ice storms together are 9%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Three Rivers and its neighbors
Every town next door is within a degree of Three Rivers in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Three Rivers’, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Three Rivers, MI | 17° | 83° | 38" | 41" |
| Sayre, PA | 17° | 84° | 37" | 35" |
| Southport, NY | 16° | 83° | 36" | 42" |
| Ashland, OH | 19° | 83° | 39" | 49" |
| Genoa, IL | 14° | 83° | 37" | 39" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Three Rivers averaged 1.3° warmer than the 1900s. The biggest change is in December (+2.9°).
A smaller shift than in 52% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Three Rivers compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Three Rivers’ place among Michigan’s.
Three Rivers weather by month
Highs, lows and precipitation from NOAA’s grid at Three Rivers’ center; snow, wet days and snow on the ground from Three Rivers, MI. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 32° | 17° | 2.3" | 15.0" | 15 | 21 | 15° – 35° |
| February | 35° | 19° | 2.0" | 9.7" | 12 | 17 | 14° – 36° |
| March | 46° | 27° | 2.2" | 3.7" | 11 | 6 | 27° – 51° |
| April | 59° | 37° | 3.4" | 0.6" | 13 | 1 | 40° – 53° |
| May | 71° | 48° | 4.2" | 0.0" | 13 | 0 | 52° – 66° |
| June | 80° | 57° | 4.2" | 0.0" | 11 | 0 | 63° – 73° |
| July | 83° | 61° | 3.6" | 0.0" | 10 | 0 | 66° – 78° |
| August | 81° | 60° | 3.8" | 0.0" | 11 | 0 | 65° – 76° |
| September | 75° | 52° | 3.5" | 0.0" | 10 | 0 | 58° – 68° |
| October | 62° | 42° | 3.6" | 0.0" | 12 | 0 | 48° – 57° |
| November | 48° | 32° | 2.8" | 2.9" | 13 | 3 | 33° – 47° |
| December | 37° | 23° | 2.2" | 9.3" | 14 | 13 | 17° – 40° |
| Year | 59° | 40° | 37.8" | 41.2" | 144 | 60 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 27° to 51°. October is the most reliable, staying within 9°.
Where Three Rivers’ numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Three Rivers’ center.
- Snow: Three Rivers, MI (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Three Rivers, MI, 1.2 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Three Rivers’ climate
What is the weather like in Three Rivers?
A typical July afternoon reaches 83°, a January night drops to 17°, and about 41 inches of snow falls in a normal winter. Colder January nights than 73% of U.S. towns; cooler July afternoons than 68% of U.S. towns.
How cold does it get in Three Rivers in winter?
January nights average 17°. About 145 nights a year reach 32° or below and 7 reach 0° or below. In the coldest January of the last 30 years the month averaged 15°.
How much snow does Three Rivers get?
About 41 inches in a normal winter at Three Rivers, MI, most of it in January, with snow on the ground about 60 days a year.
How hot does it get in Three Rivers?
July, with a typical high of 83° and a low of 61°. About 13 days a year reach 90° (Three Rivers, MI).
When is the first and last frost in Three Rivers?
In half of years the last spring frost (32°) comes by April 30 and the first fall frost by October 17, about 170 frost-free days, at Three Rivers, MI.
What growing zone is Three Rivers in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −8°.
What is the best time of year to visit Three Rivers?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Three Rivers getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 52% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Three Rivers.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.