Sumner, MO climate
Sumner has chilly winters and warm summers. A typical July afternoon reaches 88°, a January night drops to 19°, and about 14 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Sumner feels like
Winter
Spring
Summer
Fall
Sumner 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 | 36° | 19° | 1.4" | 4.4" | 5 | 21° – 38° |
| February | 42° | 23° | 1.8" | 3.2" | 6 | 21° – 43° |
| March | 54° | 33° | 2.7" | 1.4" | 7 | 36° – 57° |
| April | 65° | 43° | 4.0" | 0.2" | 9 | 45° – 60° |
| May | 75° | 53° | 5.3" | 0 | 10 | 59° – 73° |
| June | 84° | 63° | 5.3" | 0 | 9 | 70° – 78° |
| July | 88° | 67° | 4.6" | 0 | 7 | 73° – 84° |
| August | 86° | 64° | 4.1" | 0 | 7 | 69° – 81° |
| September | 79° | 56° | 4.1" | 0 | 7 | 62° – 73° |
| October | 67° | 44° | 3.2" | 0 | 8 | 49° – 62° |
| November | 53° | 33° | 2.4" | 0.4" | 5 | 35° – 51° |
| December | 41° | 23° | 1.7" | 4.1" | 6 | 18° – 40° |
| Year | 64° | 43° | 40.4" | 13.7" | 86 |
“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 Sumner
Sumner gets 40 inches of rain and melted snow a year. May is the wettest month and January the driest. Rain or snow falls on about 86 days a year.
About 192 frost-free days a year
In half of years the last 32° night comes by April 14 and the first one by October 23. That leaves about 192 frost-free days for gardens, longer than 66% of U.S. towns.
Heating and cooling a home in Sumner
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Sumner, 81% of that work is heating and 19% 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.
How Sumner 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 Sumner averaged 0.5° warmer than the 1900s. The biggest change is in December (+1.7°). The shift is smaller than in 96% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Sumner’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 18° to 40°. June is the most reliable, staying within 8°.
Common questions about Sumner’s climate
What is the coldest month in Sumner?
January, with a typical high of 36° and a low of 19°.
What is the hottest month in Sumner?
July, with a typical high of 88° and a low of 67°. About 28 days a year reach 90°.
How much snow does Sumner get?
About 14 inches in a normal winter, most of it in January.
When is the first frost in Sumner?
In half of years the first 32° night comes by October 23, and the last spring frost by April 14.
What is the rainiest month in Sumner?
May, with 5.3 inches of rain and melted snow. The year totals 40 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Sumner itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Sumner 3 Sw, MO (3 mi, snow) and Brookfield, MO (12 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.