What is the hottest month in South Beloit?

July is the warmest month in South Beloit, with an average high of 79.6°F.

What is the coldest month in South Beloit?

January is the coldest month in South Beloit, with an average low of 10.7°F.

What month does South Beloit get the most rain?

June is typically the wettest month in South Beloit, with about 5.64 inches of precipitation.

What plant hardiness zone is South Beloit in?

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

Has the climate in South Beloit changed recently?

9% of South Beloit'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.

South Beloit, IL

Climate overview — based on NOAA 1991-2020 normals from BELOIT, WI US.

Dfb Warm-summer humid continental climate 6b USDA hardiness Zone 6b

Year-round temperatures (°F)

Avg high Avg low

Climate summary

South Beloit has an annual average temperature of 45.4°F with about 37.4 inches of precipitation per year and 35.6 inches of snow. The warmest month is July (average high 79.6°F), and the coldest is January (average low 10.7°F). June is typically the wettest month (5.64 in) and February the driest (1.52 in). Snow typically falls from October through April.

Pleasant months

4 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

51.8°F

warmest to coldest month

Heating need

7,311

HDD/yr

Cooling need

261

CDD/yr

Best time to visit South Beloit

Full guide →

Climate change signal

All-time records →

33 of 366 (9%) of South Beloit'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		13
1900s		10
1910s		35
1920s		29
1930s		72
1940s		23
1950s		33
1960s		12
1970s		17
1980s		33
1990s		20
2000s		20
2010s		26
2020s		23

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	25.1°F	10.7°F	17.9°F	1.60 in	9.8 in	9
February	29.4°F	13.9°F	21.6°F	1.52 in	7.3 in	7
March	41.5°F	23.8°F	32.7°F	2.13 in	4.3 in	8
April	54.8°F	34.4°F	44.6°F	3.72 in	1.1 in	10
May	66.5°F	45.7°F	56.1°F	4.34 in	—	12
June	76.1°F	55.8°F	65.9°F	5.64 in	—	11
July	79.6°F	59.8°F	69.7°F	3.36 in	—	9
August	78.0°F	58.1°F	68.1°F	4.14 in	—	9
September	71.3°F	50.3°F	60.8°F	3.83 in	—	8
October	58.3°F	38.7°F	48.5°F	2.77 in	0.2 in	9
November	43.2°F	27.4°F	35.3°F	2.40 in	2.7 in	8
December	30.5°F	17.0°F	23.8°F	1.96 in	10.2 in	9