Flat Branch, IL climate
Flat Branch has chilly winters and warm summers. A typical July afternoon reaches 86°, a January night drops to 20°, and about 15 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decade13° warmer than normal today. The forecast high is 86°, and a typical Oct 1 in Flat Branch peaks around 73°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in Flat Branch feels like
Winter
Spring
Summer
Fall
Flat Branch 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 | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 35° | 20° | 2.4" | 5.1" | 9 | 9 | 20° – 39° |
| February | 41° | 24° | 2.0" | 2.6" | 8 | 6 | 20° – 42° |
| March | 52° | 33° | 2.8" | 2.6" | 11 | 2 | 35° – 56° |
| April | 65° | 42° | 4.2" | 0.5" | 12 | 0 | 46° – 60° |
| May | 75° | 53° | 4.8" | 0 | 13 | 0 | 58° – 72° |
| June | 84° | 62° | 4.8" | 0 | 11 | 0 | 68° – 76° |
| July | 86° | 65° | 3.9" | 0 | 9 | 0 | 70° – 83° |
| August | 85° | 63° | 3.4" | 0 | 8 | 0 | 69° – 80° |
| September | 79° | 56° | 3.1" | 0 | 8 | 0 | 62° – 72° |
| October | 67° | 44° | 3.4" | 0.1" | 9 | 0 | 51° – 61° |
| November | 52° | 34° | 3.3" | 0.9" | 10 | 1 | 35° – 50° |
| December | 40° | 25° | 2.5" | 2.7" | 9 | 4 | 18° – 41° |
| Year | 63° | 43° | 40.4" | 14.5" | 116 | 22 |
“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 Flat Branch
Flat Branch 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 116 days a year. Snow covers the ground about 22 days of the year.
About 188 frost-free days a year
In half of years the last 32° night comes by April 17 and the first one by October 23. That leaves about 188 frost-free days for gardens, longer than 62% of U.S. towns.
Heating and cooling a home in Flat Branch
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Flat Branch, 82% of that work is heating and 18% 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.
Flat Branch and its neighbors
Flat Branch borders 5 towns with climate data. January nights across them vary by 0.6°. Moweaqua has the coldest January nights (20°) and Prairieton the hottest July afternoons (86°). Flat Branch’s January low is 20° and its July high 86°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Flat Branch 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 Flat Branch averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.1°). The shift is smaller than in 72% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Flat Branch’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 Flat Branch’s climate
What is the coldest month in Flat Branch?
January, with a typical high of 35° and a low of 20°.
What is the hottest month in Flat Branch?
July, with a typical high of 86° and a low of 65°. About 34 days a year reach 90°.
How much snow does Flat Branch get?
About 15 inches in a normal winter, most of it in January.
When is the first frost in Flat Branch?
In half of years the first 32° night comes by October 23, and the last spring frost by April 17.
What is the rainiest month in Flat Branch?
June, with 4.8 inches of rain and melted snow. The year totals 40 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Flat Branch itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Pana, IL (15 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.