Rensselaer, MO climate
Rensselaer has chilly winters and warm summers. A typical July afternoon reaches 86°, 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 Rensselaer feels like
Winter
Spring
Summer
Fall
Rensselaer 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° | 1.9" | 3.4" | 6 | 21° – 39° |
| February | 41° | 23° | 1.9" | 3.1" | 6 | 20° – 42° |
| March | 52° | 32° | 2.8" | 1.6" | 8 | 34° – 56° |
| April | 64° | 43° | 4.1" | 0.6" | 10 | 46° – 60° |
| May | 74° | 53° | 5.1" | 0 | 11 | 59° – 72° |
| June | 83° | 63° | 4.7" | 0 | 9 | 69° – 77° |
| July | 86° | 67° | 4.1" | 0 | 8 | 71° – 83° |
| August | 85° | 64° | 3.7" | 0 | 8 | 69° – 80° |
| September | 78° | 57° | 3.6" | 0 | 7 | 62° – 74° |
| October | 66° | 45° | 3.1" | 0 | 8 | 49° – 61° |
| November | 52° | 34° | 2.7" | 0.7" | 7 | 36° – 52° |
| December | 40° | 24° | 2.0" | 3.1" | 7 | 17° – 41° |
| Year | 63° | 44° | 39.7" | 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 Rensselaer
Rensselaer 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 199 frost-free days a year
In half of years the last 32° night comes by April 10 and the first one by October 27. That leaves about 199 frost-free days for gardens, longer than 72% of U.S. towns.
Heating and cooling a home in Rensselaer
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Rensselaer, 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 Rensselaer 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 Rensselaer averaged 0.6° warmer than the 1900s. The biggest change is in December (+1.9°). The shift is smaller than in 95% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Rensselaer’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 Rensselaer’s climate
What is the coldest month in Rensselaer?
January, with a typical high of 35° and a low of 19°.
What is the hottest month in Rensselaer?
July, with a typical high of 86° and a low of 67°. About 25 days a year reach 90°.
How much snow does Rensselaer get?
About 13 inches in a normal winter, most of it in January.
When is the first frost in Rensselaer?
In half of years the first 32° night comes by October 27, and the last spring frost by April 10.
What is the rainiest month in Rensselaer?
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 Rensselaer itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Palmyra, MO (7 mi, snow) and Hannibal Wtr Wks, 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.