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Cass County Climate

Cass County, Iowa

JanFebMarAprMayJunJulAugSepOctNovDec49.3°AVG °F

Avg Annual Temp

49.3°F

Annual Precip

36.8"

Annual Snowfall

27.3"

Extreme Heat Days

22.4

days >= 90°F/yr

Monthly Temperature

54.4°F avgJFMAMJJASOND

Precipitation Calendar

Dry
Wet❄= snowfall
❄0.8"
❄1.2"
❄2.0"
❄3.7"
5.4"
5.4"
4.3"
4.4"
3.5"
❄2.9"
❄1.7"
❄1.4"
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Seasonal Overview

Comfort ZoneSpring37°61°11.1"Summer71°75°14.1"Fall37°65°8.1"Winter21°26°3.4"20°40°60°80°100°

National Comparison

Warmer than 28% of US counties
Wetter than 37% of US counties
More seasonal variation than 85% of US counties

Climate Profile

About Cass County Weather

Closing the Gap on National Medians

Cass County averages 49.3°F annually, the warmest in this regional group and only 3.7 degrees below the national median. This southern-shifted location brings more intense summer heat to the local landscape.

Warmest of the Selected Counties

Averaging 1.3 degrees above the Iowa state mean of 48.0°F, Cass County represents the warmer side of the state. It also sees 36.8 inches of precipitation, slightly exceeding the state average.

More Heat than Northern Peers

Cass is significantly warmer than Carroll (48.3°F) and Calhoun (47.2°F). It receives less snow than northern counties, averaging 27.3 inches per year.

Significant Summer Highs

July averages 74.8°F, but the standout figure is the 22 days per year where temperatures exceed 90°F. Winters are the mildest in this set, with a January average of 20.6°F.

Prioritize Cooling and Hydration

The 22 days of extreme heat require residents to have reliable air conditioning and heat-safety plans. Lower snowfall of 27.3 inches makes winter travel easier here than in Iowa's northern counties.

Frequently Asked Questions

What is the average temperature in Cass County?
The average annual temperature in Cass County, IA is 49.3°F, based on NOAA 30-year climate normals (1991-2020).
How much rain does Cass County get?
Cass County receives an average of 36.8 inches of precipitation per year, including both rain and meltwater from snow. This is based on NOAA 30-year climate normals.
Does it snow in Cass County?
Yes, Cass County receives an average of 27.3 inches of snowfall per year according to NOAA climate normals.
How hot does Cass County get in summer?
The average summer temperature (June-August) in Cass County is 72.9°F. The county experiences an average of 22.4 days per year above 90°F.
How cold are winters in Cass County?
The average winter temperature (December-February) in Cass County is 23.8°F. January, typically the coldest month, averages 20.6°F.

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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.

Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.

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