Walnut, MO climate
Walnut has chilly winters and warm summers. A typical July afternoon reaches 90°, a January night drops to 23°, and about 10 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Walnut feels like
Winter
Spring
Summer
Fall
Walnut 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 | 41° | 23° | 1.5" | 2.6" | 7 | 4 | 26° – 43° |
| February | 47° | 27° | 1.9" | 3.0" | 7 | 4 | 29° – 46° |
| March | 57° | 36° | 2.8" | 1.2" | 9 | 1 | 40° – 59° |
| April | 67° | 45° | 4.5" | 0 | 11 | 0 | 49° – 62° |
| May | 76° | 55° | 5.9" | 0 | 13 | 0 | 60° – 73° |
| June | 85° | 65° | 5.4" | 0 | 10 | 0 | 70° – 79° |
| July | 90° | 69° | 4.5" | 0 | 9 | 0 | 74° – 85° |
| August | 89° | 67° | 3.8" | 0 | 8 | 0 | 71° – 84° |
| September | 81° | 58° | 4.4" | 0 | 8 | 0 | 64° – 76° |
| October | 69° | 46° | 3.6" | 0 | 9 | 0 | 51° – 63° |
| November | 56° | 36° | 2.8" | 0.3" | 8 | 0 | 39° – 54° |
| December | 45° | 26° | 2.0" | 2.4" | 7 | 2 | 22° – 42° |
| Year | 67° | 46° | 43.0" | 9.5" | 105 | 10 |
“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 Walnut
Walnut gets 43 inches of rain and melted snow a year. May is the wettest month and January the driest. Rain or snow falls on about 105 days a year. Snow covers the ground about 10 days of the year.
About 192 frost-free days a year
In half of years the last 32° night comes by April 12 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 Walnut
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Walnut, 77% of that work is heating and 23% is cooling.
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.
Walnut and its neighbors
Walnut borders 5 towns with climate data. January nights across them vary by 1.1°. Homer has the coldest January nights (22°) and Potosi the hottest July afternoons (90°). Walnut’s January low is 23° and its July high 90°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Walnut 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 Walnut averaged 0.6° warmer than the 1900s. The biggest change is in January (+1.8°). The shift is smaller than in 94% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Walnut’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 22° to 42°. June is the most reliable, staying within 8°.
Common questions about Walnut’s climate
What is the coldest month in Walnut?
January, with a typical high of 41° and a low of 23°.
What is the hottest month in Walnut?
July, with a typical high of 90° and a low of 69°. About 47 days a year reach 90°.
How much snow does Walnut get?
About 10 inches in a normal winter, most of it in February.
When is the first frost in Walnut?
In half of years the first 32° night comes by October 23, and the last spring frost by April 12.
What is the rainiest month in Walnut?
May, with 5.9 inches of rain and melted snow. The year totals 43 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Walnut itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Butler 4w, MO (10 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.