Tremont, IL climate
Tremont has chilly winters and warm summers. A typical July afternoon reaches 86°, a January night drops to 17°, and about 24 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Tremont feels like
Winter
Spring
Summer
Fall
Tremont 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 | 34° | 17° | 2.1" | 7.2" | 8 | 14 | 18° – 37° |
| February | 39° | 21° | 1.9" | 7.0" | 7 | 9 | 17° – 41° |
| March | 51° | 31° | 2.5" | 3.0" | 9 | 3 | 33° – 55° |
| April | 64° | 40° | 3.9" | 0.4" | 11 | 0 | 45° – 58° |
| May | 74° | 52° | 4.6" | 0 | 11 | 0 | 57° – 72° |
| June | 83° | 61° | 4.2" | 0 | 10 | 0 | 67° – 75° |
| July | 86° | 65° | 4.2" | 0 | 8 | 0 | 70° – 81° |
| August | 84° | 62° | 3.7" | 0 | 8 | 0 | 67° – 79° |
| September | 79° | 54° | 3.3" | 0 | 7 | 0 | 61° – 71° |
| October | 66° | 43° | 3.2" | 0 | 9 | 0 | 49° – 60° |
| November | 51° | 32° | 2.8" | 1.2" | 8 | 1 | 34° – 50° |
| December | 38° | 23° | 2.2" | 5.6" | 8 | 7 | 16° – 41° |
| Year | 62° | 42° | 38.4" | 24.4" | 103 | 33 |
“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 Tremont
Tremont gets 38 inches of rain and melted snow a year. May is the wettest month and February the driest. Rain or snow falls on about 103 days a year. Snow covers the ground about 33 days of the year.
About 178 frost-free days a year
In half of years the last 32° night comes by April 21 and the first one by October 17. That leaves about 178 frost-free days for gardens, longer than 50% of U.S. towns.
Heating and cooling a home in Tremont
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Tremont, 84% of that work is heating and 16% 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.
Tremont and its neighbors
Tremont borders 4 towns with climate data. January nights across them vary by 0.5°. Morton has the coldest January nights (17°) and Hopedale the hottest July afternoons (86°). Tremont’s January low is 17° and its July high 86°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Tremont 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 Tremont averaged 1.4° warmer than the 1900s. The biggest change is in December (+2.6°). The shift is larger than in 63% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Tremont’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 16° to 41°. June is the most reliable, staying within 8°.
Common questions about Tremont’s climate
What is the coldest month in Tremont?
January, with a typical high of 34° and a low of 17°.
What is the hottest month in Tremont?
July, with a typical high of 86° and a low of 65°. About 24 days a year reach 90°.
How much snow does Tremont get?
About 24 inches in a normal winter, most of it in January.
When is the first frost in Tremont?
In half of years the first 32° night comes by October 17, and the last spring frost by April 21.
What is the rainiest month in Tremont?
May, with 4.6 inches of rain and melted snow. The year totals 38 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Tremont itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Mackinaw 3wsw, IL (1 mi, snow) and Congerville 2nw, IL (12 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.