Guymon, OK climate
Guymon has chilly winters and hot summers, with very little rain. A typical July afternoon reaches 94°, a January night drops to 22°, and about 3 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decade8° cooler than normal today. The forecast high is 70°, and a typical Oct 1 in Guymon peaks around 78°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in Guymon feels like
Winter
Spring
Summer
Fall
Guymon 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 | 49° | 22° | 0.4" | 0.9" | 3 | 0 | 30° – 43° |
| February | 53° | 25° | 0.4" | 0.1" | 3 | 0 | 32° – 47° |
| March | 63° | 32° | 1.2" | 0.9" | 4 | 0 | 41° – 55° |
| April | 71° | 40° | 1.3" | 0 | 5 | 0 | 48° – 62° |
| May | 80° | 51° | 2.2" | 0 | 6 | 0 | 59° – 72° |
| June | 90° | 61° | 2.5" | 0 | 7 | 0 | 70° – 80° |
| July | 94° | 66° | 2.8" | 0 | 7 | 0 | 77° – 85° |
| August | 92° | 64° | 2.8" | 0 | 7 | 0 | 73° – 84° |
| September | 85° | 56° | 1.3" | 0 | 4 | 0 | 65° – 77° |
| October | 73° | 43° | 1.7" | 0 | 4 | 0 | 51° – 63° |
| November | 60° | 31° | 0.5" | 0 | 2 | 0 | 39° – 51° |
| December | 49° | 23° | 0.8" | 0.8" | 3 | 0 | 30° – 41° |
| Year | 72° | 43° | 17.8" | 2.7" | 54 | 1 |
“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 Guymon
Guymon gets 18 inches of rain and melted snow a year. August is the wettest month and February the driest. Rain or snow falls on about 54 days a year.
About 188 frost-free days a year
In half of years the last 32° night comes by April 18 and the first one by October 23. That leaves about 188 frost-free days for gardens, longer than 62% of U.S. towns.
Heating and cooling a home in Guymon
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Guymon, 72% of that work is heating and 28% 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.
How Guymon 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 Guymon averaged 0.9° warmer than the 1900s. The biggest change is in March (+2.5°). The shift is smaller than in 80% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Guymon’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 32° to 47°. July is the most reliable, staying within 9°.
Common questions about Guymon’s climate
What is the coldest month in Guymon?
January, with a typical high of 49° and a low of 22°.
What is the hottest month in Guymon?
July, with a typical high of 94° and a low of 66°. About 89 days a year reach 90°.
How much snow does Guymon get?
About 3 inches in a normal winter, most of it in January.
When is the first frost in Guymon?
In half of years the first 32° night comes by October 23, and the last spring frost by April 18.
What is the rainiest month in Guymon?
August, with 2.8 inches of rain and melted snow. The year totals 18 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Guymon itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Goodwell Rsch Stn, OK (10 mi, snow) and Guymon Municipal Airport, OK (2 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.