St. Charles, AR climate
St. Charles has mild winters and warm summers, with plenty of rain. A typical July afternoon reaches 91°, a January night drops to 34°, and about 1 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in St. Charles feels like
Winter
Spring
Summer
Fall
St. Charles 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 | 50° | 34° | 4.1" | 0.6" | 7 | 0 | 36° – 49° |
| February | 55° | 37° | 4.3" | 0.2" | 7 | 0 | 37° – 55° |
| March | 64° | 44° | 5.3" | 0.4" | 7 | 0 | 48° – 64° |
| April | 73° | 53° | 5.6" | 0 | 7 | 0 | 57° – 68° |
| May | 81° | 62° | 4.5" | 0 | 7 | 0 | 68° – 78° |
| June | 89° | 70° | 3.5" | 0 | 5 | 0 | 75° – 84° |
| July | 91° | 72° | 3.3" | 0 | 6 | 0 | 76° – 85° |
| August | 91° | 71° | 2.9" | 0 | 5 | 0 | 76° – 85° |
| September | 86° | 64° | 2.9" | 0 | 4 | 0 | 72° – 82° |
| October | 75° | 52° | 3.9" | 0 | 5 | 0 | 59° – 69° |
| November | 62° | 43° | 4.3" | 0 | 6 | 0 | 47° – 58° |
| December | 53° | 36° | 5.1" | 0 | 6 | 0 | 34° – 53° |
| Year | 72° | 53° | 49.6" | 1.2" | 72 | 0 |
“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 St. Charles
St. Charles gets 50 inches of rain and melted snow a year. April is the wettest month and September the driest. Rain or snow falls on about 72 days a year.
About 238 frost-free days a year
In half of years the last 32° night comes by March 17 and the first one by November 10. That leaves about 238 frost-free days for gardens, longer than 88% of U.S. towns.
Heating and cooling a home in St. Charles
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In St. Charles, 61% of that work is heating and 39% 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 St. Charles 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 St. Charles averaged 0.8° warmer than the 1900s. The biggest change is in February (+1.5°). The shift is smaller than in 85% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at St. Charles’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 34° to 53°. June is the most reliable, staying within 8°.
Common questions about St. Charles’s climate
What is the coldest month in St. Charles?
January, with a typical high of 50° and a low of 34°.
What is the hottest month in St. Charles?
July, with a typical high of 91° and a low of 72°. About 68 days a year reach 90°.
How much snow does St. Charles get?
About 1 inches in a normal winter, most of it in January.
When is the first frost in St. Charles?
In half of years the first 32° night comes by November 10, and the last spring frost by March 17.
What is the rainiest month in St. Charles?
April, with 5.6 inches of rain and melted snow. The year totals 50 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for St. Charles itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Saint Charles, AR (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.