London Mills has chilly winters and warm summers
A typical July afternoon reaches 86°, a January night drops to 16°, and about 21 inches of snow falls in a normal winter.
A year in London Mills at a glance
Each month’s typical high and low, and what it brings.
What stands out about London Mills’s climate
Read from where London Mills sits among Illinois’s towns. The page puts what stands out first.
Warmer than it used to be
The last 30 years in London Mills averaged 0.6° warmer than the 1900s. The biggest change is in December (+1.9°).
A smaller shift than in 92% of U.S. towns.
Change by month
What a year in London Mills feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
21 inches of snow, 38 of rain and melt
May is the wettest month and January the driest. Rain or snow falls on about 106 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
About 185 frost-free days a year
In half of years the last 32° night comes by April 17 and the first by October 22.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Living with London Mills’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
185 frost-free days. The last frost comes by Apr 17 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 22.
About 21" a winter over 9 days with an inch or more, most in February. Snow covers the ground about 36 days a year.
Months averaging under 55° run from October through April. Heating is 85% of the year’s heating-and-cooling load.
About 26 days a year reach 90°, and July afternoons average 86°.
The nicest months are May, June, August, September and October. 0.0 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →How London Mills compares
Against every U.S. town on TownTapestry, each counted once, with its place in Illinois.
London Mills 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 | 32° | 16° | 1.8" | 5.7" | 7 | 14 | 16° – 36° |
| February | 37° | 20° | 1.9" | 6.0" | 8 | 10 | 15° – 39° |
| March | 50° | 30° | 2.4" | 2.5" | 9 | 3 | 32° – 54° |
| April | 63° | 40° | 3.8" | 1.0" | 11 | 0 | 43° – 59° |
| May | 74° | 51° | 5.1" | 0 | 12 | 0 | 57° – 70° |
| June | 83° | 61° | 4.6" | 0 | 10 | 0 | 68° – 76° |
| July | 86° | 65° | 4.1" | 0 | 9 | 0 | 70° – 81° |
| August | 84° | 62° | 3.6" | 0 | 8 | 0 | 67° – 78° |
| September | 78° | 54° | 3.6" | 0 | 7 | 0 | 60° – 71° |
| October | 65° | 42° | 3.0" | 0 | 9 | 0 | 48° – 59° |
| November | 50° | 32° | 2.6" | 1.1" | 8 | 1 | 33° – 50° |
| December | 37° | 22° | 2.1" | 5.0" | 8 | 8 | 15° – 39° |
| Year | 61° | 41° | 38.4" | 21.3" | 106 | 36 |
Heating and cooling a home in London Mills
85% 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 15° to 39°. June is the most reliable, staying within 7°.
Common questions about London Mills’s climate
What is the coldest month in London Mills?
January, with a typical high of 32° and a low of 16°.
What is the hottest month in London Mills?
July, with a typical high of 86° and a low of 65°. About 26 days a year reach 90°.
How much snow does London Mills get?
About 21 inches in a normal winter, most of it in February.
When is the first frost in London Mills?
In half of years the first 32° night comes by October 22, and the last spring frost by April 17.
What is the rainiest month in London Mills?
May, with 5.1 inches of rain and melted snow. The year totals 38 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in London Mills.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for London Mills itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Prairie City 2s, IL (13 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.