What is the hottest month in Hillsdale?

July is the warmest month in Hillsdale, with an average high of 85.7°F.

What is the coldest month in Hillsdale?

January is the coldest month in Hillsdale, with an average low of 14.6°F.

What month does Hillsdale get the most rain?

May is typically the wettest month in Hillsdale, with about 4.87 inches of precipitation.

What plant hardiness zone is Hillsdale in?

Hillsdale is approximately in USDA plant hardiness Zone 6b, based on the average annual extreme minimum temperature.

Has the climate in Hillsdale changed recently?

13.4% of Hillsdale'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.

Hillsdale, IL

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

Dfa Hot-summer humid continental climate 6b USDA hardiness Zone 6b

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Hillsdale has an annual average temperature of 50.9°F with about 39.1 inches of precipitation per year and 28.4 inches of snow. The warmest month is July (average high 85.7°F), and the coldest is January (average low 14.6°F). May is typically the wettest month (4.87 in) and January the driest (1.64 in). Snow typically falls from November through April.

Pleasant months

2 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

52.7°F

warmest to coldest month

Heating need

5,877

HDD/yr

Cooling need

795

CDD/yr

Best time to visit Hillsdale

Full guide →

Climate change signal

All-time records →

49 of 366 (13.4%) of Hillsdale'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		5
1900s		26
1920s		0
1930s		0
1940s		34
1950s		6
1960s		38
1970s		42
1980s		47
1990s		35
2000s		42
2010s		62
2020s		29

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	30.8°F	14.6°F	22.7°F	1.64 in	9.8 in	8
February	35.7°F	18.6°F	27.2°F	1.81 in	6.1 in	7
March	48.9°F	29.3°F	39.1°F	2.70 in	2.8 in	9
April	62.2°F	39.9°F	51.1°F	3.96 in	0.7 in	11
May	73.7°F	51.6°F	62.6°F	4.87 in	—	12
June	82.8°F	61.5°F	72.2°F	4.42 in	—	10
July	85.7°F	65.1°F	75.4°F	4.13 in	—	8
August	83.4°F	62.9°F	73.1°F	4.10 in	—	9
September	77.1°F	54.5°F	65.8°F	3.57 in	—	8
October	64.0°F	42.9°F	53.4°F	3.21 in	0.1 in	9
November	48.8°F	30.7°F	39.8°F	2.56 in	1.6 in	8
December	35.9°F	20.5°F	28.2°F	2.12 in	7.3 in	8