Aetna, MI climate
Aetna has cold, snowy winters and pleasant summers. A typical July afternoon reaches 82°, a January night drops to 14°, and about 64 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Aetna feels like
Winter
Spring
Summer
Fall
Aetna 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 | 29° | 14° | 2.4" | 17.6" | 13 | 11° – 31° |
| February | 32° | 14° | 1.9" | 12.7" | 9 | 10° – 32° |
| March | 43° | 22° | 2.4" | 6.9" | 8 | 22° – 47° |
| April | 56° | 33° | 3.8" | 2.8" | 11 | 36° – 50° |
| May | 69° | 43° | 3.7" | 0 | 10 | 48° – 62° |
| June | 78° | 53° | 3.5" | 0 | 8 | 61° – 71° |
| July | 82° | 57° | 3.2" | 0 | 8 | 63° – 75° |
| August | 80° | 55° | 3.6" | 0 | 9 | 62° – 72° |
| September | 73° | 48° | 3.0" | 0 | 8 | 54° – 65° |
| October | 59° | 38° | 3.8" | 0.6" | 9 | 45° – 55° |
| November | 45° | 29° | 3.0" | 6.4" | 10 | 29° – 44° |
| December | 34° | 21° | 2.4" | 16.8" | 13 | 18° – 37° |
| Year | 57° | 36° | 36.7" | 63.8" | 117 |
“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 Aetna
Aetna gets 37 inches of rain and melted snow a year. October is the wettest month and February the driest. Rain or snow falls on about 117 days a year.
About 142 frost-free days a year
In half of years the last 32° night comes by May 13 and the first one by October 2. That leaves about 142 frost-free days for gardens, shorter than 88% of U.S. towns.
Heating and cooling a home in Aetna
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Aetna, 95% of that work is heating and 5% 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.
Aetna and its neighbors
Aetna borders 4 towns with climate data. January nights across them vary by 0.6°. Deerfield has the coldest January nights (14°) and Big Prairie the hottest July afternoons (82°). Aetna’s January low is 14° and its July high 82°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Aetna 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 Aetna averaged 1.4° warmer than the 1900s. The biggest change is in December (+2.9°). The shift is larger than in 63% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Aetna’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 22° to 47°. June is the most reliable, staying within 10°.
Common questions about Aetna’s climate
What is the coldest month in Aetna?
February, with a typical high of 32° and a low of 14°.
What is the hottest month in Aetna?
July, with a typical high of 82° and a low of 57°. About 8 days a year reach 90°.
How much snow does Aetna get?
About 64 inches in a normal winter, most of it in January.
When is the first frost in Aetna?
In half of years the first 32° night comes by October 2, and the last spring frost by May 13.
What is the rainiest month in Aetna?
October, with 3.8 inches of rain and melted snow. The year totals 37 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Aetna itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at White Cloud 9e, MI (4 mi, snow) and Big Rapids Wtp, MI (13 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.