Calvin, KS climate
Calvin has chilly winters and warm summers. A typical July afternoon reaches 90°, a January night drops to 17°, and about 24 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Calvin feels like
Winter
Spring
Summer
Fall
Calvin 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 | 38° | 17° | 0.7" | 6.3" | 4 | 10 | 20° – 39° |
| February | 43° | 20° | 0.8" | 6.8" | 4 | 7 | 23° – 41° |
| March | 55° | 30° | 1.5" | 3.3" | 6 | 2 | 34° – 54° |
| April | 65° | 39° | 2.4" | 1.2" | 8 | 0 | 44° – 57° |
| May | 74° | 50° | 4.1" | 0 | 10 | 0 | 56° – 69° |
| June | 86° | 61° | 3.8" | 0 | 9 | 0 | 68° – 77° |
| July | 90° | 66° | 4.4" | 0 | 9 | 0 | 73° – 84° |
| August | 88° | 64° | 3.5" | 0 | 8 | 0 | 70° – 84° |
| September | 80° | 55° | 2.4" | 0 | 6 | 0 | 61° – 74° |
| October | 67° | 42° | 2.0" | 0.3" | 5 | 0 | 47° – 59° |
| November | 53° | 29° | 1.2" | 2.0" | 4 | 2 | 33° – 48° |
| December | 41° | 20° | 0.9" | 4.4" | 4 | 7 | 20° – 36° |
| Year | 65° | 41° | 27.9" | 24.3" | 77 | 27 |
“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 Calvin
Calvin gets 28 inches of rain and melted snow a year. July is the wettest month and January the driest. Rain or snow falls on about 77 days a year. Snow covers the ground about 27 days of the year.
About 165 frost-free days a year
In half of years the last 32° night comes by April 30 and the first one by October 14. That leaves about 165 frost-free days for gardens, shorter than 65% of U.S. towns.
Heating and cooling a home in Calvin
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Calvin, 84% of that work is heating and 16% 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.
Calvin and its neighbors
Calvin borders 4 towns with climate data. January nights across them vary by 0.8°. Ionia has both the coldest January nights (16°) and the hottest July afternoons (91°). Calvin’s January low is 17° and its July high 90°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Calvin 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 Calvin averaged 0.8° warmer than the 1900s. The biggest change is in January (+2.6°). The shift is smaller than in 86% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Calvin’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 34° to 54°. June is the most reliable, staying within 10°.
Common questions about Calvin’s climate
What is the coldest month in Calvin?
January, with a typical high of 38° and a low of 17°.
What is the hottest month in Calvin?
July, with a typical high of 90° and a low of 66°. About 51 days a year reach 90°.
How much snow does Calvin get?
About 24 inches in a normal winter, most of it in February.
When is the first frost in Calvin?
In half of years the first 32° night comes by October 14, and the last spring frost by April 30.
What is the rainiest month in Calvin?
July, with 4.4 inches of rain and melted snow. The year totals 28 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Calvin itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Jewell, KS (4 mi, snow) and Mankato, KS (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.