St
Catharine has chilly winters and warm summers. A typical July afternoon reaches 87°, a January night drops to 18°, and about 19 inches of snow falls in a normal winter.
A year in St. Catharine at a glance
Each month’s typical high and low, and what it brings.
What stands out about St. Catharine’s climate
Read from where St. Catharine sits among Missouri’s towns. The page puts what stands out first.
19 inches of snow, 40 of rain and melt
May is the wettest month and January the driest. Rain or snow falls on about 110 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Warmer than it used to be
The last 30 years in St. Catharine averaged 0.5° warmer than the 1900s. The biggest change is in December (+1.9°).
A smaller shift than in 97% of U.S. towns.
Change by month
What a year in St. Catharine feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 192 frost-free days a year
In half of years the last 32° night comes by April 14 and the first by October 23.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Living with St. Catharine’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
192 frost-free days. The last frost comes by Apr 14 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 23.
About 19" a winter over 8 days with an inch or more, most in February. Snow covers the ground about 30 days a year.
Months averaging under 55° run from October through April. Heating is 81% of the year’s heating-and-cooling load.
About 28 days a year reach 90°, and July afternoons average 87°.
The nicest months are April, May, June, September and October.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →How St. Catharine compares
Against every U.S. town on TownTapestry, each counted once, with its place in Missouri.
St. Catharine 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 | 36° | 18° | 1.4" | 4.8" | 7 | 12 | 20° – 37° |
| February | 41° | 22° | 1.8" | 5.9" | 8 | 8 | 20° – 43° |
| March | 53° | 32° | 2.7" | 2.5" | 10 | 2 | 35° – 57° |
| April | 64° | 43° | 4.0" | 0.2" | 12 | 0 | 45° – 59° |
| May | 74° | 53° | 5.3" | 0 | 13 | 0 | 58° – 72° |
| June | 83° | 63° | 5.3" | 0 | 11 | 0 | 69° – 77° |
| July | 87° | 67° | 4.6" | 0 | 10 | 0 | 72° – 83° |
| August | 86° | 64° | 4.0" | 0 | 9 | 0 | 69° – 80° |
| September | 78° | 56° | 4.0" | 0 | 8 | 0 | 61° – 73° |
| October | 66° | 44° | 3.3" | 0.1" | 9 | 0 | 49° – 62° |
| November | 52° | 33° | 2.4" | 1.2" | 8 | 1 | 34° – 51° |
| December | 40° | 23° | 1.7" | 4.2" | 7 | 8 | 17° – 40° |
| Year | 63° | 43° | 40.4" | 18.9" | 110 | 30 |
Heating and cooling a home in St. Catharine
81% of the work is heating, so the furnace matters far more than the air conditioner.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 17° to 40°. June is the most reliable, staying within 8°.
Common questions about St. Catharine’s climate
What is the coldest month in St. Catharine?
January, with a typical high of 36° and a low of 18°.
What is the hottest month in St. Catharine?
July, with a typical high of 87° and a low of 67°. About 28 days a year reach 90°.
How much snow does St. Catharine get?
About 19 inches in a normal winter, most of it in February.
When is the first frost in St. Catharine?
In half of years the first 32° night comes by October 23, and the last spring frost by April 14.
What is the rainiest month in St. Catharine?
May, with 5.3 inches of rain and melted snow. The year totals 40 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in St. Catharine.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for St. Catharine itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Brookfield, MO (4 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Today’s forecast: National Weather Service.