Weather without surprises: Adams keeps close to the norm for U.S. towns
Midsummer highs settle at about 86°. Temperatures cover 68° across the year, low to high. By January nights alone, it runs colder than 66% of U.S. towns. Radiators earn their keep from November to March, the months that average under 50°.
A year in Adams at a glance
Each month’s typical high and low, and what it brings.
What stands out about Adams’ climate
Compared with towns across the U.S., with Adams’ place in Illinois beside it.
What a year in Adams feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 191 frost-free days a year
In half of years the last 32° night comes by April 14 and the first by October 23. Frost and day counts come from NOAA’s station at Quincy Rgnl Airport, 5 miles from the town’s center, at about the same height.
The 2023 USDA map puts Adams’ center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −6°. 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 17 inches of snow a winter
Snow, measured at Payson, IL, falls mostly in January and December. Precipitation (rain plus melted snow) adds up to 39 inches a year; May is the wettest month and January the driest. Rain or snow falls on about 105 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Adams
83% 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 Quincy Rgnl Airport.
Living with Adams’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
191 frost-free days in zone 6a. The last frost comes by Apr 14 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 23.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October.
Parks & trails →Of the yearly building losses FEMA expects in Adams from natural hazards, river flooding is the largest share (25%); heat waves, cold waves, winter storms and ice storms together are 35%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Adams and similar climates
TownRatings has no climate map of the towns around Adams yet.
Climates most like Adams’, 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 |
|---|---|---|---|---|
| Adams, IL | 19° | 86° | 39" | 17" |
| Excelsior Springs, MO | 19° | 87° | 40" | 19" |
| Terre Haute, IN | 21° | 87° | 43" | 15" |
| Van Wert, OH | 19° | 84° | 39" | 17" |
| Spring Hill, KS | 21° | 88° | 40" | 14" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Adams averaged 0.6° warmer than the 1900s. The biggest change is in December (+1.8°).
A smaller shift than in 97% 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 Adams compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Adams’ place among Illinois’.
Adams weather by month
Highs, lows and precipitation from NOAA’s grid at Adams’ center; snow, wet days and snow on the ground from Payson, IL. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 35° | 19° | 1.8" | 5.3" | 7 | 15 | 21° – 39° |
| February | 40° | 23° | 1.9" | 4.5" | 6 | 10 | 20° – 43° |
| March | 52° | 32° | 2.6" | 1.4" | 8 | 2 | 34° – 56° |
| April | 64° | 42° | 4.1" | 0.0" | 11 | 0 | 46° – 60° |
| May | 74° | 53° | 5.0" | 0.0" | 12 | 0 | 58° – 73° |
| June | 83° | 63° | 4.9" | 0.0" | 10 | 0 | 69° – 77° |
| July | 86° | 66° | 3.9" | 0.0" | 10 | 0 | 71° – 83° |
| August | 85° | 64° | 3.9" | 0.0" | 8 | 0 | 69° – 80° |
| September | 78° | 56° | 3.4" | 0.0" | 9 | 0 | 62° – 73° |
| October | 66° | 45° | 3.1" | 0.0" | 9 | 0 | 49° – 61° |
| November | 52° | 34° | 2.6" | 0.7" | 8 | 1 | 35° – 51° |
| December | 40° | 24° | 2.0" | 5.1" | 7 | 8 | 17° – 41° |
| Year | 63° | 43° | 39.2" | 17.0" | 105 | 36 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 17° to 41°. June is the most reliable, staying within 9°.
Where Adams’ 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 Adams’ center.
- Snow: Payson, IL.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Quincy Rgnl Airport, 5 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 Adams’ climate
What is the weather like in Adams?
A typical July afternoon reaches 86°, a January night drops to 19°, and about 17 inches of snow falls in a normal winter. Colder January nights than 66% of U.S. towns; hotter July afternoons than 58% of U.S. towns.
How cold does it get in Adams in winter?
January nights average 19°. About 112 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 Adams get?
About 17 inches in a normal winter at Payson, IL, most of it in January and December, with snow on the ground about 36 days a year.
How hot does it get in Adams?
July, with a typical high of 86° and a low of 66°. About 24 days a year reach 90° and 1 reach 100° (Quincy Rgnl Airport).
When is the first and last frost in Adams?
In half of years the last spring frost (32°) comes by April 14 and the first fall frost by October 23, about 191 frost-free days, at Quincy Rgnl Airport.
What growing zone is Adams in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −6°.
What is the best time of year to visit Adams?
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 Adams getting warmer?
Yes: 1991–2020 averaged 0.6° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 97% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Adams.
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.