What is the hottest month in Flanagan?

July is the warmest month in Flanagan, with an average high of 86.1°F.

What is the coldest month in Flanagan?

January is the coldest month in Flanagan, with an average low of 15.2°F.

What month does Flanagan get the most rain?

May is typically the wettest month in Flanagan, with about 4.60 inches of precipitation.

What plant hardiness zone is Flanagan in?

Flanagan is approximately in USDA plant hardiness Zone 7a, based on the average annual extreme minimum temperature.

Has the climate in Flanagan changed recently?

10.1% of Flanagan's all-time daily heat records were set in the last decade (since 2015), compared to roughly 5% if records were evenly distributed over time.

Flanagan, IL

Climate overview — based on NOAA 1991-2020 normals from MINONK, IL US.

Dfa Hot-summer humid continental climate 7a USDA hardiness Zone 7a

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Flanagan has an annual average temperature of 51.3°F with about 37.7 inches of precipitation per year and 21.7 inches of snow. The warmest month is July (average high 86.1°F), and the coldest is January (average low 15.2°F). May is typically the wettest month (4.60 in) and February the driest (1.84 in). Snow typically falls from November through April.

Pleasant months

2 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

51°F

warmest to coldest month

Heating need

5,736

HDD/yr

Cooling need

786

CDD/yr

Best time to visit Flanagan

Full guide →

Climate change signal

All-time records →

37 of 366 (10.1%) of Flanagan's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.

1890s		11
1900s		24
1910s		60
1920s		19
1930s		68
1940s		12
1950s		21
1960s		12
1970s		15
1980s		28
1990s		18
2000s		24
2010s		33
2020s		21

Bars: number of all-time daily heat records still standing that were set in each decade.

Monthly averages

Month	Avg High	Avg Low	Avg Temp	Precipitation	Snow	Rainy days
January	32.8°F	15.2°F	24.0°F	1.99 in	5.9 in	9
February	37.5°F	18.8°F	28.1°F	1.84 in	5.2 in	8
March	49.6°F	28.6°F	39.1°F	2.51 in	3.2 in	9
April	62.7°F	38.8°F	50.7°F	3.66 in	0.8 in	12
May	74.2°F	50.8°F	62.5°F	4.60 in	—	13
June	83.1°F	60.6°F	71.8°F	3.98 in	—	10
July	86.1°F	63.9°F	75.0°F	3.82 in	—	9
August	84.3°F	61.7°F	73.0°F	3.48 in	—	9
September	79.0°F	53.7°F	66.4°F	3.87 in	—	8
October	66.0°F	42.0°F	54.0°F	3.08 in	—	10
November	50.6°F	31.0°F	40.8°F	2.61 in	1.1 in	9
December	38.1°F	21.1°F	29.6°F	2.21 in	5.5 in	8