Nights turn raw in Thompson Township each January, colder than in 92% of U.S. towns
In July the day’s top temperature is typically 83°. Winter and summer sit 71° apart. Summers stay cool: July afternoons here are cooler than in 75% of U.S. towns. Picnics, hikes and garden evenings come into their own from May to September, with highs of 70–83°.
A year in Thompson Township at a glance
Each month’s typical high and low, and what it brings.
What stands out about Thompson Township’s climate
Compared with towns across the U.S., with Thompson Township’s place in Illinois beside it.
What a year in Thompson Township feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 160 frost-free days a year
In half of years the last 32° night comes by May 1 and the first by October 9. Frost and day counts come from NOAA’s station at Elizabeth, IL, 8 miles from the town’s center, 190 ft lower.
The 2023 USDA map puts Thompson Township’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −17°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 32 inches of snow a winter
Snow, measured at Apple Rvr Canyon St Park, IL, falls mostly in January. Precipitation (rain plus melted snow) adds up to 39 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 78 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Thompson Township
91% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Elizabeth, IL.
Living with Thompson Township’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
160 frost-free days in zone 5a. The last frost comes by May 1 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 9.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 101 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Thompson Township from natural hazards, river flooding is the largest share (55%); heat waves, cold waves, winter storms and ice storms together are 15%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Thompson Township and its neighbors
Every town next door is within a degree of Thompson Township in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Thompson Township’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Thompson Township, IL | 11° | 83° | 39" | 32" |
| Iowa Falls, IA | 9° | 83° | 37" | 28" |
| Westville, IN | 16° | 83° | 39" | 34" |
| Ghent, NY | 16° | 84° | 42" | 31" |
| Charlotte, MI | 17° | 82° | 36" | 38" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Thompson Township averaged 1.3° warmer than the 1900s. The biggest change is in December (+2.6°).
A smaller shift than in 51% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Thompson Township compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Thompson Township’s place among Illinois’.
Thompson Township weather by month
Highs, lows and precipitation from NOAA’s grid at Thompson Township’s center; snow, wet days and snow on the ground from Apple Rvr Canyon St Park, IL. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 28° | 11° | 1.4" | 10.5" | 5 | 10° – 32° |
| February | 33° | 15° | 1.6" | 7.7" | 5 | 11° – 36° |
| March | 45° | 26° | 2.3" | 3.9" | 6 | 27° – 51° |
| April | 59° | 36° | 3.8" | 0.8" | 8 | 38° – 54° |
| May | 70° | 48° | 4.4" | 0.0" | 9 | 53° – 66° |
| June | 80° | 58° | 5.7" | 0.0" | 9 | 65° – 73° |
| July | 83° | 62° | 4.8" | 0.0" | 7 | 66° – 79° |
| August | 81° | 59° | 4.0" | 0.0" | 7 | 65° – 76° |
| September | 74° | 51° | 3.9" | 0.0" | 6 | 57° – 68° |
| October | 61° | 40° | 3.1" | 0.2" | 6 | 46° – 56° |
| November | 46° | 29° | 2.4" | 1.1" | 5 | 29° – 47° |
| December | 33° | 18° | 1.8" | 7.9" | 6 | 11° – 36° |
| Year | 58° | 38° | 39.2" | 32.1" | 78 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 11° to 36°. June is the most reliable, staying within 8°.
Where Thompson Township’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Thompson Township’s center.
- Snow: Apple Rvr Canyon St Park, IL.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Elizabeth, IL, 8 miles from the town’s center, 190 ft lower; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Thompson Township’s climate
What is the weather like in Thompson Township?
A typical July afternoon reaches 83°, a January night drops to 11°, and about 32 inches of snow falls in a normal winter. Colder January nights than 92% of U.S. towns; cooler July afternoons than 75% of U.S. towns.
How cold does it get in Thompson Township in winter?
January nights average 11°. About 156 nights a year reach 32° or below and 19 reach 0° or below. In the coldest January of the last 30 years the month averaged 10°.
How much snow does Thompson Township get?
About 32 inches in a normal winter at Apple Rvr Canyon St Park, IL, most of it in January.
How hot does it get in Thompson Township?
July, with a typical high of 83° and a low of 62°. About 11 days a year reach 90° (Elizabeth, IL).
When is the first and last frost in Thompson Township?
In half of years the last spring frost (32°) comes by May 1 and the first fall frost by October 9, about 160 frost-free days, at Elizabeth, IL.
What growing zone is Thompson Township in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −17°.
What is the best time of year to visit Thompson Township?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Thompson Township getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 51% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Thompson Township.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.