What is the hottest month in Franklin?

July is the warmest month in Franklin, with an average high of 86.5°F.

What is the coldest month in Franklin?

January is the coldest month in Franklin, with an average low of 18.1°F.

What month does Franklin get the most rain?

June is typically the wettest month in Franklin, with about 4.89 inches of precipitation.

What plant hardiness zone is Franklin in?

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

Franklin, IL

Climate overview — based on NOAA 1991-2020 normals from JACKSONVILLE 2E, IL US.

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

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Franklin has an annual average temperature of 52.7°F with about 39.3 inches of precipitation per year and 16.2 inches of snow. The warmest month is July (average high 86.5°F), and the coldest is January (average low 18.1°F). June is typically the wettest month (4.89 in) and February the driest (1.72 in). Snow typically falls from November through April.

Pleasant months

2 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

48.2°F

warmest to coldest month

Heating need

5,247

HDD/yr

Cooling need

825

CDD/yr

Best time to visit Franklin

Full guide →

Climate change signal

All-time records →

29 of 366 (7.9%) of Franklin'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		28
1900s		15
1910s		27
1920s		36
1930s		97
1940s		27
1950s		38
1960s		8
1970s		4
1980s		14
1990s		12
2000s		20
2010s		26
2020s		14

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	36.0°F	18.1°F	27.1°F	1.93 in	5.1 in	8
February	41.1°F	21.4°F	31.2°F	1.72 in	4.3 in	7
March	52.4°F	30.1°F	41.2°F	2.81 in	2.0 in	11
April	64.9°F	40.3°F	52.6°F	4.27 in	0.3 in	12
May	74.8°F	51.7°F	63.3°F	4.82 in	—	13
June	83.3°F	60.8°F	72.1°F	4.89 in	—	11
July	86.5°F	64.0°F	75.3°F	3.96 in	—	9
August	85.2°F	61.7°F	73.4°F	3.39 in	—	9
September	80.0°F	53.5°F	66.7°F	3.50 in	—	8
October	67.7°F	42.3°F	55.0°F	2.97 in	—	10
November	53.0°F	31.9°F	42.5°F	3.01 in	1.0 in	10
December	41.2°F	23.3°F	32.2°F	1.98 in	3.5 in	8