Annapolis, MO climate
Annapolis has chilly winters and warm summers, with plenty of rain. A typical July afternoon reaches 89°, a January night drops to 23°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Annapolis feels like
Winter
Spring
Summer
Fall
Annapolis weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 44° | 23° | 3.1" | 27° – 42° |
| February | 49° | 26° | 3.1" | 27° – 47° |
| March | 59° | 34° | 4.2" | 39° – 59° |
| April | 70° | 43° | 5.3" | 49° – 62° |
| May | 77° | 53° | 5.6" | 60° – 72° |
| June | 85° | 62° | 3.9" | 68° – 78° |
| July | 89° | 65° | 4.1" | 71° – 83° |
| August | 88° | 63° | 3.8" | 70° – 82° |
| September | 81° | 56° | 3.6" | 64° – 75° |
| October | 71° | 44° | 3.5" | 53° – 63° |
| November | 57° | 34° | 4.5" | 38° – 51° |
| December | 46° | 26° | 3.3" | 23° – 44° |
| Year | 68° | 44° | 48.0" |
“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 Annapolis
Annapolis gets 48 inches of rain and melted snow a year. May is the wettest month and February the driest.
About 199 frost-free days a year
In half of years the last 32° night comes by April 9 and the first one by October 26. That leaves about 199 frost-free days for gardens, longer than 72% of U.S. towns.
Heating and cooling a home in Annapolis
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Annapolis, 76% of that work is heating and 24% 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 Annapolis 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 Annapolis averaged 0.5° warmer than the 1900s. The biggest change is in February (+1.4°). The shift is smaller than in 96% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Annapolis’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 23° to 44°. October is the most reliable, staying within 9°.
Common questions about Annapolis’s climate
What is the coldest month in Annapolis?
January, with a typical high of 44° and a low of 23°.
What is the hottest month in Annapolis?
July, with a typical high of 89° and a low of 65°. About 50 days a year reach 90°.
When is the first frost in Annapolis?
In half of years the first 32° night comes by October 26, and the last spring frost by April 9.
What is the rainiest month in Annapolis?
May, with 5.6 inches of rain and melted snow. The year totals 48 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Annapolis itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Clearwater Dam, MO (17 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.