South Haven, MI climate
South Haven has chilly, snowy winters and pleasant summers. A typical July afternoon reaches 81°, a January night drops to 20°, and about 109 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in South Haven feels like
Winter
Spring
Summer
Fall
South Haven weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 33° | 20° | 2.3" | 35.9" | 17 | 18° – 36° |
| February | 35° | 22° | 2.0" | 22.9" | 13 | 16° – 37° |
| March | 45° | 29° | 2.1" | 7.9" | 12 | 29° – 51° |
| April | 56° | 38° | 3.5" | 1.7" | 12 | 39° – 53° |
| May | 68° | 48° | 3.8" | 0 | 12 | 51° – 64° |
| June | 77° | 58° | 3.6" | 0 | 10 | 62° – 73° |
| July | 81° | 63° | 3.2" | 0 | 8 | 67° – 78° |
| August | 80° | 62° | 3.6" | 0 | 10 | 65° – 76° |
| September | 74° | 55° | 3.2" | 0 | 9 | 59° – 69° |
| October | 61° | 44° | 3.8" | 0.5" | 12 | 49° – 59° |
| November | 48° | 34° | 2.8" | 7.3" | 13 | 35° – 49° |
| December | 38° | 26° | 2.5" | 32.8" | 15 | 21° – 41° |
| Year | 58° | 42° | 36.3" | 109.0" | 143 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in South Haven
South Haven gets 36 inches of rain and melted snow a year. October is the wettest month and February the driest. Rain or snow falls on about 143 days a year.
About 201 frost-free days a year
In half of years the last 32° night comes by April 17 and the first one by November 5. That leaves about 201 frost-free days for gardens, longer than 73% of U.S. towns.
Heating and cooling a home in South Haven
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In South Haven, 89% of that work is heating and 11% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
South Haven and its neighbors
South Haven borders 2 towns with climate data. January nights across them vary by 0.7°. Casco has both the coldest January nights (19°) and the hottest July afternoons (82°). South Haven’s January low is 20° and its July high 81°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How South Haven compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in South Haven averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.3°). The shift is smaller than in 71% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at South Haven’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. March swings the most: between 1991 and 2020 its average temperature ranged from 29° to 51°. September is the most reliable, staying within 10°.
Common questions about South Haven’s climate
What is the coldest month in South Haven?
January, with a typical high of 33° and a low of 20°.
What is the hottest month in South Haven?
July, with a typical high of 81° and a low of 63°. About 3 days a year reach 90°.
How much snow does South Haven get?
About 109 inches in a normal winter, most of it in January.
When is the first frost in South Haven?
In half of years the first 32° night comes by November 5, and the last spring frost by April 17.
What is the rainiest month in South Haven?
October, with 3.8 inches of rain and melted snow. The year totals 36 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for South Haven itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Bloomingdale, MI (16 mi, snow) and South Haven, MI (1 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.