What is the hottest month in St. Donatus?

July is the warmest month in St. Donatus, with an average high of 82.0°F.

What is the coldest month in St. Donatus?

January is the coldest month in St. Donatus, with an average low of 10.0°F.

What month does St. Donatus get the most rain?

June is typically the wettest month in St. Donatus, with about 6.02 inches of precipitation.

What plant hardiness zone is St. Donatus in?

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

Has the climate in St. Donatus changed recently?

29.5% of St. Donatus'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.

St. Donatus, IA

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

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

Year-round temperatures (°F)

Avg high Avg low

Climate summary

St. Donatus has an annual average temperature of 47°F with about 39.6 inches of precipitation per year and 37.9 inches of snow. The warmest month is July (average high 82.0°F), and the coldest is January (average low 10.0°F). June is typically the wettest month (6.02 in) and January the driest (1.23 in). Snow typically falls from October through May.

Pleasant months

2 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

53.4°F

warmest to coldest month

Heating need

6,921

HDD/yr

Cooling need

453

CDD/yr

Best time to visit St. Donatus

Full guide →

Climate change signal

All-time records →

108 of 366 (29.5%) of St. Donatus'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		116
1900s		73
1920s		0
1930s		0
1940s		0
1950s		0
1960s		0
1970s		0
1980s		0
1990s		0
2000s		0
2010s		160
2020s		17

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	26.9°F	10.0°F	18.5°F	1.23 in	10.3 in	9
February	31.4°F	13.6°F	22.5°F	1.53 in	9.0 in	8
March	44.5°F	24.4°F	34.5°F	2.25 in	5.1 in	9
April	57.4°F	36.2°F	46.8°F	3.89 in	1.3 in	11
May	68.9°F	47.4°F	58.2°F	4.38 in	0.3 in	13
June	78.2°F	58.3°F	68.3°F	6.02 in	—	12
July	82.0°F	61.7°F	71.9°F	4.93 in	—	9
August	80.3°F	59.5°F	69.9°F	4.19 in	—	10
September	74.1°F	50.5°F	62.3°F	3.86 in	—	9
October	60.9°F	39.3°F	50.1°F	3.02 in	0.4 in	9
November	45.6°F	27.7°F	36.7°F	2.48 in	2.0 in	8
December	32.6°F	16.8°F	24.7°F	1.82 in	9.5 in	9