The climate in Big Spring Township sits close to the middle of U.S. towns
Midwinter brings lows of about 20°. The latest 30-year average runs 1.0° warmer than 1901–2000’s, with December up the most. Seedlings are safe outdoors from about April 16, with the first autumn frost due around October 20.
A year in Big Spring Township at a glance
Each month’s typical high and low, and what it brings.
What stands out about Big Spring Township’s climate
Compared with towns across the U.S., with Big Spring Township’s place in Illinois beside it.
What a year in Big Spring Township feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 185 frost-free days a year
In half of years the last 32° night comes by April 16 and the first by October 20. Frost and day counts come from NOAA’s station at Neoga 4nw, IL, 3 miles from the town’s center, at about the same height.
The 2023 USDA map puts Big Spring Township’s center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −5°. 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 14 inches of snow a winter
Snow, measured at Windsor, IL, falls mostly in January. Precipitation (rain plus melted snow) adds up to 42 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 107 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Big Spring Township
82% of the work is heating. Months averaging under 55° run from November 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 Neoga 4nw, IL.
Living with Big Spring Township’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
185 frost-free days in zone 6b. The last frost comes by Apr 16 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 20.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 1.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Big Spring Township from natural hazards, river flooding is the largest share (37%); heat waves, cold waves, winter storms and ice storms together are 27%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Big Spring Township and its neighbors
Every town next door is within a degree of Big Spring Township in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Big Spring 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 |
|---|---|---|---|---|
| Big Spring Township, IL | 20° | 86° | 42" | 14" |
| Moberly, MO | 19° | 87° | 42" | 15" |
| West Carrollton, OH | 22° | 86° | 42" | 12" |
| Connersville, IN | 20° | 85° | 44" | 16" |
| Moundsville, WV | 22° | 85° | 43" | 16" |
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 Big Spring Township averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.1°).
A smaller shift than in 79% 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 Big Spring Township compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Big Spring Township’s place among Illinois’.
Big Spring Township weather by month
Highs, lows and precipitation from NOAA’s grid at Big Spring Township’s center; snow, wet days and snow on the ground from Windsor, IL. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 36° | 20° | 2.7" | 5.2" | 9 | 10 | 21° – 40° |
| February | 41° | 24° | 2.2" | 3.4" | 7 | 5 | 20° – 42° |
| March | 52° | 33° | 3.1" | 1.4" | 9 | 1 | 35° – 56° |
| April | 65° | 43° | 4.7" | 0.3" | 11 | 0 | 46° – 60° |
| May | 75° | 54° | 4.7" | 0.0" | 13 | 0 | 58° – 72° |
| June | 84° | 63° | 4.9" | 0.0" | 10 | 0 | 68° – 76° |
| July | 86° | 66° | 4.1" | 0.0" | 8 | 0 | 70° – 83° |
| August | 85° | 64° | 3.2" | 0.0" | 8 | 0 | 69° – 80° |
| September | 80° | 56° | 3.0" | 0.0" | 7 | 0 | 63° – 72° |
| October | 67° | 45° | 3.6" | 0.0" | 8 | 0 | 52° – 61° |
| November | 52° | 34° | 3.6" | 0.8" | 9 | 1 | 35° – 50° |
| December | 41° | 26° | 2.6" | 2.6" | 8 | 4 | 19° – 42° |
| Year | 64° | 44° | 42.3" | 13.7" | 107 | 21 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 19° to 42°. June is the most reliable, staying within 8°.
Where Big Spring 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 Big Spring Township’s center.
- Snow: Windsor, IL.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Neoga 4nw, IL, 3 miles from the town’s center, at about the same height; 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 Big Spring Township’s climate
What is the weather like in Big Spring Township?
A typical July afternoon reaches 86°, a January night drops to 20°, and about 14 inches of snow falls in a normal winter. Colder January nights than 57% of U.S. towns; hotter July afternoons than 57% of U.S. towns.
How cold does it get in Big Spring Township in winter?
January nights average 20°. About 122 nights a year reach 32° or below and 5 reach 0° or below. In the coldest January of the last 30 years the month averaged 21°.
How much snow does Big Spring Township get?
About 14 inches in a normal winter at Windsor, IL, most of it in January, with snow on the ground about 21 days a year.
How hot does it get in Big Spring Township?
July, with a typical high of 86° and a low of 66°. About 39 days a year reach 90° and 1 reach 100° (Neoga 4nw, IL).
When is the first and last frost in Big Spring Township?
In half of years the last spring frost (32°) comes by April 16 and the first fall frost by October 20, about 185 frost-free days, at Neoga 4nw, IL.
What growing zone is Big Spring Township in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −5°.
What is the best time of year to visit Big Spring Township?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Big Spring Township getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 79% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Big Spring 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.