Grayson, MO climate
Grayson has chilly winters and warm summers. A typical July afternoon reaches 87°, a January night drops to 19°, and about 18 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Grayson feels like
Winter
Spring
Summer
Fall
Grayson 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 | 37° | 19° | 1.0" | 4.9" | 7 | 8 | 22° – 40° |
| February | 43° | 23° | 1.4" | 5.9" | 7 | 5 | 24° – 43° |
| March | 54° | 33° | 2.2" | 1.7" | 10 | 2 | 36° – 57° |
| April | 65° | 43° | 4.0" | 0.3" | 11 | 0 | 46° – 59° |
| May | 75° | 53° | 5.3" | 0 | 12 | 0 | 58° – 73° |
| June | 84° | 63° | 4.8" | 0 | 10 | 0 | 69° – 77° |
| July | 87° | 67° | 4.8" | 0 | 9 | 0 | 72° – 84° |
| August | 86° | 65° | 4.6" | 0 | 8 | 0 | 70° – 81° |
| September | 79° | 57° | 3.8" | 0 | 8 | 0 | 62° – 74° |
| October | 67° | 44° | 3.1" | 0.3" | 8 | 0 | 49° – 60° |
| November | 53° | 33° | 2.0" | 1.1" | 7 | 1 | 35° – 51° |
| December | 41° | 23° | 1.6" | 4.0" | 7 | 5 | 18° – 39° |
| Year | 64° | 44° | 38.6" | 18.2" | 104 | 21 |
“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 Grayson
Grayson gets 39 inches of rain and melted snow a year. May is the wettest month and January the driest. Rain or snow falls on about 104 days a year. Snow covers the ground about 21 days of the year.
About 183 frost-free days a year
In half of years the last 32° night comes by April 18 and the first one by October 20. That leaves about 183 frost-free days for gardens, longer than 56% of U.S. towns.
Heating and cooling a home in Grayson
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Grayson, 82% of that work is heating and 18% 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 Grayson 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 Grayson averaged 1.2° warmer than the 1900s. The biggest change is in March (+2.5°). The shift is smaller than in 54% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Grayson’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 39°. June is the most reliable, staying within 8°.
Common questions about Grayson’s climate
What is the coldest month in Grayson?
January, with a typical high of 37° and a low of 19°.
What is the hottest month in Grayson?
July, with a typical high of 87° and a low of 67°. About 30 days a year reach 90°.
How much snow does Grayson get?
About 18 inches in a normal winter, most of it in February.
When is the first frost in Grayson?
In half of years the first 32° night comes by October 20, and the last spring frost by April 18.
What is the rainiest month in Grayson?
May, with 5.3 inches of rain and melted snow. The year totals 39 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Grayson itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Kansas City Intl Airport, MO (19 mi, snow) and Smithville Lake, MO (10 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.