Casco, MI climate
Casco has chilly, snowy winters and pleasant summers. A typical July afternoon reaches 82°, a January night drops to 19°, and about 109 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Casco feels like
Winter
Spring
Summer
Fall
Casco 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 | 32° | 19° | 2.4" | 35.9" | 17 | 17° – 36° |
| February | 35° | 20° | 2.1" | 22.9" | 13 | 16° – 36° |
| March | 45° | 28° | 2.1" | 7.9" | 12 | 28° – 51° |
| April | 57° | 37° | 3.5" | 1.7" | 12 | 39° – 53° |
| May | 69° | 47° | 3.9" | 0 | 12 | 51° – 64° |
| June | 78° | 57° | 3.6" | 0 | 10 | 62° – 73° |
| July | 82° | 62° | 3.3" | 0 | 8 | 67° – 78° |
| August | 80° | 60° | 3.6" | 0 | 10 | 65° – 76° |
| September | 74° | 53° | 3.2" | 0 | 9 | 58° – 68° |
| October | 62° | 43° | 3.9" | 0.5" | 12 | 49° – 58° |
| November | 48° | 33° | 2.9" | 7.3" | 13 | 34° – 48° |
| December | 37° | 25° | 2.6" | 32.8" | 15 | 21° – 41° |
| Year | 58° | 40° | 37.0" | 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 Casco
Casco 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 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 Casco
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Casco, 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.
Casco and its neighbors
Casco borders 4 towns with climate data. January nights across them vary by 1.7°. Lee has both the coldest January nights (18°) and the hottest July afternoons (83°). Casco’s January low is 19° and its July high 82°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Casco 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 Casco averaged 1.1° warmer than the 1900s. The biggest change is in December (+2.4°). The shift is smaller than in 58% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Casco’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 28° to 51°. September is the most reliable, staying within 9°.
Common questions about Casco’s climate
What is the coldest month in Casco?
January, with a typical high of 32° and a low of 19°.
What is the hottest month in Casco?
July, with a typical high of 82° and a low of 62°. About 3 days a year reach 90°.
How much snow does Casco get?
About 109 inches in a normal winter, most of it in January.
When is the first frost in Casco?
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 Casco?
October, with 3.9 inches of rain and melted snow. The year totals 37 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Casco itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Bloomingdale, MI (13 mi, snow) and South Haven, MI (6 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.