Photo: Boscophotos · CC BY-SA 3.0Midwinter lows in Fulton sink below those of 89% of U.S. towns
On a normal July day the thermometer tops out near 84°. The wettest month is June; the driest is January. By precipitation alone, it ranks drier than 68% of U.S. towns. Plan time outside from May to June and August to October, when highs sit at 63–82°.
A year in Fulton at a glance
Each month’s typical high and low, and what it brings.
What stands out about Fulton’s climate
Compared with towns across the U.S., with Fulton’s place in Illinois beside it.
What a year in Fulton feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 195 frost-free days a year
In half of years the last 32° night comes by April 13 and the first by October 26. Frost and day counts come from NOAA’s station at Fulton L&d #13, IL, 2.2 miles from the town’s center, at about the same height.
The 2023 USDA map puts Fulton’s center in zone 5b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −14°. 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 Clinton #1, IA, falls mostly in January. Precipitation (rain plus melted snow) adds up to 38 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 118 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Fulton
87% 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 Fulton L&d #13, IL.
Living with Fulton’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
195 frost-free days in zone 5b. The last frost comes by Apr 13 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 26.
Months with highs of 62–84° and lows of 40° or more: May, June, August, September and October. 1.6 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Fulton from natural hazards, river flooding is the largest share (51%); heat waves, cold waves, winter storms and ice storms together are 16%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Fulton and its neighbors
Every town next door is within a degree of Fulton in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Fulton’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 |
|---|---|---|---|---|
| Fulton, IL | 13° | 84° | 38" | 32" |
| Knoxville, IA | 14° | 85° | 37" | 30" |
| Auburn, IN | 17° | 84° | 38" | 30" |
| Sayre, PA | 17° | 84° | 37" | 35" |
| Claverack, NY | 16° | 84° | 42" | 31" |
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 Fulton averaged 1.1° warmer than the 1900s. The biggest change is in December (+2.3°).
A smaller shift than in 69% 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 Fulton compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Fulton’s place among Illinois’.
Fulton weather by month
Highs, lows and precipitation from NOAA’s grid at Fulton’s center; snow, wet days and snow on the ground from Clinton #1, IA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 30° | 13° | 1.5" | 9.2" | 10 | 20 | 13° – 34° |
| February | 35° | 18° | 1.8" | 7.5" | 8 | 14 | 13° – 37° |
| March | 48° | 28° | 2.5" | 3.9" | 10 | 4 | 30° – 53° |
| April | 61° | 39° | 3.8" | 0.8" | 11 | 0 | 41° – 57° |
| May | 72° | 50° | 4.5" | 0.0" | 13 | 0 | 56° – 67° |
| June | 81° | 60° | 5.0" | 0.0" | 12 | 0 | 68° – 74° |
| July | 84° | 64° | 4.1" | 0.0" | 9 | 0 | 68° – 80° |
| August | 82° | 62° | 3.9" | 0.0" | 10 | 0 | 66° – 78° |
| September | 76° | 53° | 4.0" | 0.0" | 8 | 0 | 59° – 69° |
| October | 63° | 42° | 2.8" | 0.3" | 9 | 0 | 48° – 58° |
| November | 48° | 30° | 2.4" | 2.3" | 9 | 2 | 31° – 48° |
| December | 35° | 19° | 2.0" | 7.9" | 10 | 11 | 13° – 37° |
| Year | 60° | 40° | 38.0" | 31.9" | 118 | 51 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 13° to 37°. June is the most reliable, staying within 7°.
Where Fulton’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 Fulton’s center.
- Snow: Clinton #1, IA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Fulton L&d #13, IL, 2.2 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 Fulton’s climate
What is the weather like in Fulton?
A typical July afternoon reaches 84°, a January night drops to 13°, and about 32 inches of snow falls in a normal winter. Colder January nights than 89% of U.S. towns; cooler July afternoons than 58% of U.S. towns.
How cold does it get in Fulton in winter?
January nights average 13°. About 132 nights a year reach 32° or below and 14 reach 0° or below. In the coldest January of the last 30 years the month averaged 13°.
How much snow does Fulton get?
About 32 inches in a normal winter at Clinton #1, IA, most of it in January, with snow on the ground about 51 days a year.
How hot does it get in Fulton?
July, with a typical high of 84° and a low of 64°. About 13 days a year reach 90° (Fulton L&d #13, IL).
When is the first and last frost in Fulton?
In half of years the last spring frost (32°) comes by April 13 and the first fall frost by October 26, about 195 frost-free days, at Fulton L&d #13, IL.
What growing zone is Fulton in?
Zone 5b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −14°.
What is the best time of year to visit Fulton?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Fulton getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 69% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Fulton.
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.