Castleton, MI climate
Castleton has chilly, snowy winters and pleasant summers. A typical July afternoon reaches 83°, a January night drops to 17°, and about 68 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Castleton feels like
Winter
Spring
Summer
Fall
Castleton 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 | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 31° | 17° | 2.4" | 21.5" | 16 | 24 | 15° – 34° |
| February | 34° | 17° | 2.0" | 15.3" | 12 | 20 | 12° – 34° |
| March | 45° | 25° | 2.3" | 7.2" | 12 | 9 | 25° – 49° |
| April | 58° | 35° | 3.5" | 2.1" | 13 | 1 | 39° – 52° |
| May | 70° | 46° | 4.2" | 0 | 13 | 0 | 50° – 64° |
| June | 79° | 56° | 3.8" | 0 | 12 | 0 | 63° – 72° |
| July | 83° | 60° | 3.5" | 0 | 9 | 0 | 65° – 77° |
| August | 81° | 58° | 3.6" | 0 | 11 | 0 | 64° – 75° |
| September | 74° | 51° | 3.1" | 0 | 10 | 0 | 56° – 66° |
| October | 61° | 40° | 3.7" | 0.3" | 13 | 0 | 47° – 56° |
| November | 47° | 31° | 2.8" | 5.4" | 13 | 3 | 31° – 47° |
| December | 36° | 23° | 2.2" | 16.2" | 15 | 15 | 18° – 39° |
| Year | 58° | 38° | 37.1" | 68.0" | 149 | 71 |
“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 Castleton
Castleton gets 37 inches of rain and melted snow a year. May is the wettest month and February the driest. Rain or snow falls on about 149 days a year. Snow covers the ground about 71 days of the year.
About 158 frost-free days a year
In half of years the last 32° night comes by May 3 and the first one by October 12. That leaves about 158 frost-free days for gardens, shorter than 73% of U.S. towns.
Heating and cooling a home in Castleton
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Castleton, 93% of that work is heating and 7% 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.
Castleton and its neighbors
Castleton borders 5 towns with climate data. January nights across them vary by 0.5°. Maple Grove has the coldest January nights (16°) and Nashville the hottest July afternoons (83°). Castleton’s January low is 17° and its July high 83°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Castleton 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 Castleton averaged 1.3° warmer than the 1900s. The biggest change is in December (+2.9°). The shift is larger than in 56% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Castleton’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 25° to 49°. June is the most reliable, staying within 9°.
Common questions about Castleton’s climate
What is the coldest month in Castleton?
January, with a typical high of 31° and a low of 17°.
What is the hottest month in Castleton?
July, with a typical high of 83° and a low of 60°. About 10 days a year reach 90°.
How much snow does Castleton get?
About 68 inches in a normal winter, most of it in January.
When is the first frost in Castleton?
In half of years the first 32° night comes by October 12, and the last spring frost by May 3.
What is the rainiest month in Castleton?
May, with 4.2 inches of rain and melted snow. The year totals 37 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Castleton itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Hastings, MI (8 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.