Arthur, IL climate
Arthur has chilly winters and warm summers. A typical July afternoon reaches 86°, a January night drops to 19°, and about 15 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Arthur feels like
Winter
Spring
Summer
Fall
Arthur 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 | 30-yr range |
|---|---|---|---|---|---|---|
| January | 35° | 19° | 2.3" | 4.0" | 8 | 20° – 39° |
| February | 40° | 23° | 2.0" | 4.3" | 9 | 20° – 42° |
| March | 51° | 32° | 2.7" | 1.3" | 10 | 35° – 55° |
| April | 64° | 42° | 4.3" | 0.3" | 10 | 45° – 59° |
| May | 74° | 53° | 4.5" | 0 | 13 | 58° – 72° |
| June | 83° | 62° | 4.5" | 0 | 11 | 68° – 76° |
| July | 86° | 65° | 4.1" | 0 | 9 | 70° – 82° |
| August | 84° | 63° | 3.2" | 0 | 8 | 69° – 79° |
| September | 79° | 55° | 3.0" | 0 | 7 | 62° – 72° |
| October | 67° | 44° | 3.3" | 0 | 10 | 51° – 60° |
| November | 52° | 33° | 3.3" | 0.5" | 9 | 35° – 50° |
| December | 40° | 25° | 2.4" | 4.7" | 10 | 18° – 41° |
| Year | 63° | 43° | 39.5" | 15.1" | 112 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Arthur
Arthur gets 40 inches of rain and melted snow a year. June is the wettest month and February the driest. Rain or snow falls on about 112 days a year.
About 188 frost-free days a year
In half of years the last 32° night comes by April 15 and the first one by October 20. That leaves about 188 frost-free days for gardens, longer than 62% of U.S. towns.
Heating and cooling a home in Arthur
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Arthur, 84% of that work is heating and 16% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Arthur compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Arthur averaged 1.3° warmer than the 1900s. The biggest change is in December (+2.3°). The shift is larger than in 53% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Arthur’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 18° to 41°. June is the most reliable, staying within 8°.
Common questions about Arthur’s climate
What is the coldest month in Arthur?
January, with a typical high of 35° and a low of 19°.
What is the hottest month in Arthur?
July, with a typical high of 86° and a low of 65°. About 27 days a year reach 90°.
How much snow does Arthur get?
About 15 inches in a normal winter, most of it in December.
When is the first frost in Arthur?
In half of years the first 32° night comes by October 20, and the last spring frost by April 15.
What is the rainiest month in Arthur?
June, with 4.5 inches of rain and melted snow. The year totals 40 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Arthur itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Lovington, IL (9 mi, snow) and Tuscola, IL (11 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.