Old Monroe, MO climate
Old Monroe has chilly winters and warm summers. A typical July afternoon reaches 89°, a January night drops to 21°, and about 9 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Old Monroe feels like
Winter
Spring
Summer
Fall
Old Monroe 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 | 39° | 21° | 2.3" | 4.3" | 8 | 25° – 42° |
| February | 45° | 25° | 2.1" | 2.6" | 7 | 24° – 44° |
| March | 56° | 34° | 3.3" | 0.5" | 10 | 37° – 58° |
| April | 67° | 44° | 4.5" | 0 | 10 | 48° – 61° |
| May | 76° | 54° | 4.9" | 0 | 11 | 60° – 73° |
| June | 85° | 64° | 4.5" | 0 | 9 | 69° – 78° |
| July | 89° | 68° | 3.9" | 0 | 8 | 73° – 85° |
| August | 87° | 65° | 3.6" | 0 | 7 | 70° – 82° |
| September | 80° | 57° | 3.3" | 0 | 7 | 64° – 75° |
| October | 69° | 45° | 3.1" | 0 | 8 | 52° – 63° |
| November | 55° | 35° | 3.3" | 0.1" | 8 | 37° – 52° |
| December | 44° | 26° | 2.4" | 1.5" | 7 | 21° – 43° |
| Year | 66° | 45° | 41.3" | 9.0" | 101 |
“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 Old Monroe
Old Monroe gets 41 inches of rain and melted snow a year. May is the wettest month and February the driest. Rain or snow falls on about 101 days a year.
About 203 frost-free days a year
In half of years the last 32° night comes by April 8 and the first one by October 29. That leaves about 203 frost-free days for gardens, longer than 74% of U.S. towns.
Heating and cooling a home in Old Monroe
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Old Monroe, 78% of that work is heating and 22% 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 Old Monroe 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 Old Monroe averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.3°). The shift is smaller than in 68% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Old Monroe’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 21° to 43°. June is the most reliable, staying within 9°.
Common questions about Old Monroe’s climate
What is the coldest month in Old Monroe?
January, with a typical high of 39° and a low of 21°.
What is the hottest month in Old Monroe?
July, with a typical high of 89° and a low of 68°. About 34 days a year reach 90°.
How much snow does Old Monroe get?
About 9 inches in a normal winter, most of it in January.
When is the first frost in Old Monroe?
In half of years the first 32° night comes by October 29, and the last spring frost by April 8.
What is the rainiest month in Old Monroe?
May, with 4.9 inches of rain and melted snow. The year totals 41 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Old Monroe itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at St Charles Elm Pt, MO (15 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.