Dallas County Climate

Dallas County, Missouri

JanFebMarAprMayJunJulAugSepOctNovDec55.0°AVG °F

Avg Annual Temp

55.0°F

Annual Precip

45.3"

Annual Snowfall

9.0"

Extreme Heat Days

33.7

days >= 90°F/yr

Monthly Temperature

54.4°F avgJFMAMJJASOND

Precipitation Calendar

Dry
Wet= snowfall
2.4"
2.2"
3.5"
4.9"
5.8"
4.4"
3.9"
4.2"
4.1"
3.5"
3.8"
2.5"
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Seasonal Overview

Comfort ZoneSpring45°64°14.2"Summer73°77°12.6"Fall45°68°11.4"Winter31°36°7.1"20°40°60°80°100°

National Comparison

Warmer than 51% of US counties
Wetter than 57% of US counties
More seasonal variation than 59% of US counties

Climate Profile

About Dallas County Weather

A typical American climate profile

Dallas County’s 55.0°F annual average temperature aligns closely with the national median. The region experiences a standard four-season continental climate with moderate variations.

Matching the Missouri baseline

The county’s average temperature of 55.0°F almost perfectly matches the state average of 54.9°F. Its 45.3 inches of annual rainfall is also near the state’s typical 43.8-inch mark.

Milder summers than western neighbors

Dallas County sees 34 extreme heat days per year, fewer than the 42 recorded in nearby Dade County. It also receives about 3.8 inches less snow than Dade annually.

Moderate snow and warm July peaks

Winter snowfall averages 9.0 inches, which is relatively light for the Midwest. July highs push the monthly average to 77.3°F, creating 34 days of 90°F temperatures.

Balance your home’s seasonal needs

A standard HVAC system is sufficient for the 34 days of extreme heat and mild 31.3°F January lows. Residents should keep a basic snow shovel ready for the occasional 9-inch annual accumulation.

Frequently Asked Questions

What is the average temperature in Dallas County?
The average annual temperature in Dallas County, MO is 55.0°F, based on NOAA 30-year climate normals (1991-2020).
How much rain does Dallas County get?
Dallas County receives an average of 45.3 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 Dallas County?
Yes, Dallas County receives an average of 9.0 inches of snowfall per year according to NOAA climate normals.
How hot does Dallas County get in summer?
The average summer temperature (June-August) in Dallas County is 75.2°F. The county experiences an average of 33.7 days per year above 90°F.
How cold are winters in Dallas County?
The average winter temperature (December-February) in Dallas County is 34.1°F. January, typically the coldest month, averages 31.3°F.

Track your own weather in Dallas County

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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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