What is the hottest month in Morrison?

July is the warmest month in Morrison, with an average high of 83.1°F.

What is the coldest month in Morrison?

January is the coldest month in Morrison, with an average low of 12.0°F.

What month does Morrison get the most rain?

June is typically the wettest month in Morrison, with about 4.93 inches of precipitation.

What plant hardiness zone is Morrison in?

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

Morrison, IL

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

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

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Morrison has an annual average temperature of 48.3°F with about 38.3 inches of precipitation per year and 31.5 inches of snow. The warmest month is July (average high 83.1°F), and the coldest is January (average low 12.0°F). June is typically the wettest month (4.93 in) and January the driest (1.51 in). Snow typically falls from November through April.

Pleasant months

2 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

52.1°F

warmest to coldest month

Heating need

6,525

HDD/yr

Cooling need

513

CDD/yr

Best time to visit Morrison

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Climate change signal

All-time records →

29 of 366 (7.9%) of Morrison'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		23
1900s		9
1910s		46
1920s		46
1930s		67
1940s		26
1950s		24
1960s		13
1970s		7
1980s		25
1990s		24
2000s		17
2010s		23
2020s		16

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	28.9°F	12.0°F	20.4°F	1.51 in	10.4 in	8
February	33.6°F	15.7°F	24.6°F	1.65 in	7.6 in	6
March	46.2°F	26.7°F	36.4°F	2.53 in	3.6 in	7
April	59.5°F	36.9°F	48.2°F	3.84 in	0.8 in	10
May	70.8°F	48.8°F	59.8°F	4.73 in	—	11
June	79.9°F	58.6°F	69.2°F	4.93 in	—	10
July	83.1°F	62.0°F	72.5°F	4.16 in	—	7
August	81.1°F	59.7°F	70.4°F	4.32 in	—	8
September	75.0°F	51.2°F	63.1°F	3.35 in	—	7
October	62.2°F	39.4°F	50.8°F	2.77 in	0.1 in	7
November	47.2°F	28.4°F	37.8°F	2.47 in	2.7 in	7
December	34.5°F	18.3°F	26.4°F	2.02 in	6.3 in	8