What is the hottest month in St. Olaf?

July is the warmest month in St. Olaf, with an average high of 82.2°F.

What is the coldest month in St. Olaf?

January is the coldest month in St. Olaf, with an average low of 6.3°F.

What month does St. Olaf get the most rain?

June is typically the wettest month in St. Olaf, with about 6.67 inches of precipitation.

What plant hardiness zone is St. Olaf in?

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

Has the climate in St. Olaf changed recently?

9.8% of St. Olaf'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. Olaf, IA

Climate overview — based on NOAA 1991-2020 normals from ELKADER 6 SSW, IA US.

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

Year-round temperatures (°F)

Avg high Avg low

Climate summary

St. Olaf has an annual average temperature of 45.9°F with about 38.8 inches of precipitation per year and 35.6 inches of snow. The warmest month is July (average high 82.2°F), and the coldest is January (average low 6.3°F). June is typically the wettest month (6.67 in) and January the driest (1.25 in). Snow typically falls from October through April.

Pleasant months

1 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

54.8°F

warmest to coldest month

Heating need

7,263

HDD/yr

Cooling need

384

CDD/yr

Best time to visit St. Olaf

Full guide →

Climate change signal

All-time records →

36 of 366 (9.8%) of St. Olaf'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		51
1900s		45
1910s		35
1920s		2
1930s		20
1940s		26
1950s		24
1960s		17
1970s		11
1980s		36
1990s		22
2000s		27
2010s		26
2020s		24

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	26.3°F	6.3°F	16.3°F	1.25 in	10.2 in	8
February	31.0°F	10.1°F	20.6°F	1.28 in	8.0 in	7
March	44.4°F	22.3°F	33.4°F	2.03 in	5.4 in	8
April	58.6°F	34.1°F	46.3°F	4.00 in	1.3 in	11
May	69.7°F	45.7°F	57.7°F	4.65 in	—	12
June	79.3°F	56.0°F	67.7°F	6.67 in	—	12
July	82.2°F	60.0°F	71.1°F	4.60 in	—	10
August	80.5°F	57.6°F	69.0°F	3.92 in	—	10
September	74.1°F	48.5°F	61.3°F	3.63 in	—	10
October	61.5°F	36.6°F	49.1°F	2.92 in	0.3 in	9
November	45.3°F	24.5°F	34.9°F	2.28 in	2.3 in	7
December	32.2°F	14.3°F	23.3°F	1.57 in	8.1 in	9