Mount Vernon, IN climate
Mount Vernon has chilly winters and warm summers. A typical July afternoon reaches 88°, a January night drops to 25°, and about 8 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decade17° warmer than normal today. The forecast high is 92°, and a typical Oct 1 in Mount Vernon peaks around 75°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in Mount Vernon feels like
Winter
Spring
Summer
Fall
Mount Vernon 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 | 42° | 25° | 3.3" | 2.4" | 9 | 27° – 43° |
| February | 46° | 28° | 3.1" | 3.1" | 8 | 26° – 45° |
| March | 57° | 37° | 4.4" | 1.5" | 10 | 40° – 59° |
| April | 68° | 46° | 5.0" | 0 | 11 | 50° – 62° |
| May | 77° | 57° | 4.9" | 0 | 11 | 61° – 73° |
| June | 85° | 65° | 4.3" | 0 | 9 | 70° – 80° |
| July | 88° | 69° | 4.4" | 0 | 8 | 73° – 84° |
| August | 87° | 67° | 3.3" | 0 | 6 | 72° – 83° |
| September | 81° | 59° | 3.3" | 0 | 7 | 66° – 75° |
| October | 70° | 47° | 3.3" | 0.2" | 7 | 55° – 64° |
| November | 56° | 37° | 3.9" | 0.1" | 9 | 39° – 53° |
| December | 45° | 29° | 3.8" | 1.1" | 10 | 24° – 46° |
| Year | 67° | 47° | 46.8" | 8.4" | 104 |
“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 Mount Vernon
Mount Vernon gets 47 inches of rain and melted snow a year. April is the wettest month and February the driest. Rain or snow falls on about 104 days a year.
About 202 frost-free days a year
In half of years the last 32° night comes by April 7 and the first one by October 28. That leaves about 202 frost-free days for gardens, longer than 73% of U.S. towns.
Heating and cooling a home in Mount Vernon
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Mount Vernon, 77% of that work is heating and 23% 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.
Mount Vernon and its neighbors
Mount Vernon borders 1 town with climate data. January nights across them vary by 0.0°. Black has both the coldest January nights (25°) and the hottest July afternoons (88°). Mount Vernon’s January low is 25° and its July high 88°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Mount Vernon 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 Mount Vernon averaged 0.6° warmer than the 1900s. The biggest change is in February (+1.6°). The shift is smaller than in 93% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Mount Vernon’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 24° to 46°. September is the most reliable, staying within 9°.
Common questions about Mount Vernon’s climate
What is the coldest month in Mount Vernon?
January, with a typical high of 42° and a low of 25°.
What is the hottest month in Mount Vernon?
July, with a typical high of 88° and a low of 69°. About 34 days a year reach 90°.
How much snow does Mount Vernon get?
About 8 inches in a normal winter, most of it in February.
When is the first frost in Mount Vernon?
In half of years the first 32° night comes by October 28, and the last spring frost by April 7.
What is the rainiest month in Mount Vernon?
April, with 5.0 inches of rain and melted snow. The year totals 47 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Mount Vernon itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Mt Vernon, IN (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.