Palmyra, MO climate
Palmyra has chilly winters and warm summers. A typical July afternoon reaches 87°, a January night drops to 19°, and about 13 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Palmyra feels like
Winter
Spring
Summer
Fall
Palmyra 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 | 35° | 19° | 1.8" | 3.4" | 6 | 21° – 39° |
| February | 41° | 23° | 1.9" | 3.1" | 6 | 19° – 42° |
| March | 52° | 32° | 2.7" | 1.6" | 8 | 35° – 56° |
| April | 65° | 43° | 4.1" | 0.6" | 10 | 46° – 60° |
| May | 74° | 54° | 5.1" | 0 | 11 | 59° – 73° |
| June | 83° | 63° | 4.7" | 0 | 9 | 69° – 77° |
| July | 87° | 67° | 4.1" | 0 | 8 | 71° – 84° |
| August | 85° | 65° | 3.8" | 0 | 8 | 69° – 80° |
| September | 79° | 56° | 3.6" | 0 | 7 | 62° – 74° |
| October | 66° | 45° | 3.2" | 0 | 8 | 49° – 61° |
| November | 52° | 34° | 2.6" | 0.7" | 7 | 35° – 51° |
| December | 40° | 24° | 2.0" | 3.1" | 7 | 17° – 41° |
| Year | 63° | 44° | 39.5" | 12.5" | 93 |
“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 Palmyra
Palmyra gets 40 inches of rain and melted snow a year. May is the wettest month and January the driest. Rain or snow falls on about 93 days a year.
About 204 frost-free days a year
In half of years the last 32° night comes by April 8 and the first one by October 30. That leaves about 204 frost-free days for gardens, longer than 75% of U.S. towns.
Heating and cooling a home in Palmyra
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Palmyra, 81% of that work is heating and 19% 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 Palmyra 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 Palmyra averaged 0.5° warmer than the 1900s. The biggest change is in December (+1.8°). The shift is smaller than in 97% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Palmyra’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 17° to 41°. June is the most reliable, staying within 8°.
Common questions about Palmyra’s climate
What is the coldest month in Palmyra?
January, with a typical high of 35° and a low of 19°.
What is the hottest month in Palmyra?
July, with a typical high of 87° and a low of 67°. About 31 days a year reach 90°.
How much snow does Palmyra get?
About 13 inches in a normal winter, most of it in January.
When is the first frost in Palmyra?
In half of years the first 32° night comes by October 30, and the last spring frost by April 8.
What is the rainiest month in Palmyra?
May, with 5.1 inches of rain and melted snow. The year totals 40 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Palmyra itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Palmyra, MO (2 mi, snow) and Quincy Dam 21, IL (9 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.