Sullivan Township gets about 87 inches of snow a winter, more than 96% of U.S. towns
On a normal July day the thermometer tops out near 83°. Precipitation peaks in October and eases off in February. Its July afternoons stay fresher than in 76% of U.S. towns. Keep the boiler serviced for the months from November to April, which average under 50°.
A year in Sullivan Township at a glance
Each month’s typical high and low, and what it brings.
What stands out about Sullivan Township’s climate
Compared with towns across the U.S., with Sullivan Township’s place in Michigan beside it.
What a year in Sullivan Township 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 19. Frost and day counts come from NOAA’s station at Muskegon Co Airport, 8 miles from the town’s center, at about the same height.
The 2023 USDA map puts Sullivan Township’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −6°. 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 87 inches of snow a winter
Snow, measured at Muskegon Co Airport, falls mostly in January. Precipitation (rain plus melted snow) adds up to 36 inches a year; October is the wettest month and February the driest. Rain or snow falls on about 143 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Sullivan Township
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 Muskegon Co Airport.
Living with Sullivan Township’s 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 19.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 9.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Sullivan Township from natural hazards, river flooding is the largest share (63%); heat waves, cold waves, winter storms and ice storms together are 7%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Sullivan Township and its neighbors
Every town next door is within a degree of Sullivan Township in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Sullivan Township’s, 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 |
|---|---|---|---|---|
| Sullivan Township, MI | 18° | 83° | 36" | 87" |
| Farmington, NY | 17° | 81° | 35" | 86" |
| Montrose-Ghent, OH | 20° | 83° | 39" | 65" |
| Clearfield, PA | 18° | 83° | 41" | 63" |
| Bennington, VT | 13° | 81° | 42" | 75" |
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 Sullivan Township averaged 1.6° warmer than the 1900s. The biggest change is in February (+2.7°).
A bigger shift than in 66% 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 Sullivan Township compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Sullivan Township’s place among Michigan’s.
Sullivan Township weather by month
Highs, lows and precipitation from NOAA’s grid at Sullivan Township’s center; snow, wet days and snow on the ground from Muskegon Co Airport. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 32° | 18° | 2.3" | 29.1" | 16 | 24 | 16° – 34° |
| February | 34° | 18° | 1.9" | 20.0" | 13 | 20 | 15° – 35° |
| March | 44° | 25° | 2.3" | 7.5" | 11 | 10 | 26° – 49° |
| April | 58° | 35° | 3.6" | 1.8" | 13 | 1 | 38° – 52° |
| May | 69° | 46° | 3.7" | 0.0" | 11 | 0 | 50° – 64° |
| June | 79° | 55° | 3.6" | 0.0" | 10 | 0 | 62° – 73° |
| July | 83° | 60° | 3.1" | 0.0" | 9 | 0 | 66° – 77° |
| August | 81° | 58° | 3.2" | 0.0" | 9 | 0 | 64° – 75° |
| September | 74° | 51° | 3.1" | 0.0" | 9 | 0 | 57° – 66° |
| October | 61° | 40° | 4.0" | 0.0" | 13 | 0 | 47° – 57° |
| November | 47° | 32° | 3.0" | 6.5" | 14 | 4 | 32° – 46° |
| December | 37° | 24° | 2.4" | 22.3" | 15 | 16 | 21° – 39° |
| Year | 58° | 38° | 36.2" | 87.2" | 143 | 74 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 26° to 49°. September is the most reliable, staying within 9°.
Where Sullivan Township’s 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 Sullivan Township’s center.
- Snow: Muskegon Co Airport.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Muskegon Co Airport, 8 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 Sullivan Township’s climate
What is the weather like in Sullivan Township?
A typical July afternoon reaches 83°, a January night drops to 18°, and about 87 inches of snow falls in a normal winter. Colder January nights than 71% of U.S. towns; cooler July afternoons than 76% of U.S. towns.
How cold does it get in Sullivan Township in winter?
January nights average 18°. About 130 nights a year reach 32° or below and 3 reach 0° or below. In the coldest January of the last 30 years the month averaged 16°.
How much snow does Sullivan Township get?
About 87 inches in a normal winter at Muskegon Co Airport, most of it in January, with snow on the ground about 74 days a year.
How hot does it get in Sullivan Township?
July, with a typical high of 83° and a low of 60°. About 3 days a year reach 90° (Muskegon Co Airport).
When is the first and last frost in Sullivan Township?
In half of years the last spring frost (32°) comes by April 30 and the first fall frost by October 19, about 170 frost-free days, at Muskegon Co Airport.
What growing zone is Sullivan Township in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −6°.
What is the best time of year to visit Sullivan Township?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Sullivan Township getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 66% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Sullivan Township.
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.