30-year climate normals

Washington County Climate and Weather Averages

Hottest month — July

88.7°

average daily high. The coldest month is January, averaging a low of 17.2°F.

Washington County gets 15.39" of precipitation a year, and 50% of it falls in May, Jun, Jul.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

Month	Avg high	Avg low	Precip
January	41.1°	17.2°	0.17"
February	43.5°	19.0°	0.20"
March	54.1°	26.8°	0.71"
April	60.9°	33.5°	1.43"
May	70.5°	43.4°	2.65"
June	82.5°	53.8°	2.24"
July	88.7°	60.3°	2.78"
August	86.5°	58.5°	2.36"
September	78.3°	49.9°	1.24"
October	63.8°	36.6°	0.99"
November	50.9°	25.8°	0.42"
December	41.1°	17.5°	0.20"

Rainfall by month

Washington County has a distinct wet season. 50% of the year's precipitation arrives in May, Jun, Jul.

January 0.17"

February 0.20"

March 0.71"

April 1.43"

May 2.65"

June 2.24"

July 2.78"

August 2.36"

September 1.24"

October 0.99"

November 0.42"

December 0.20"

Annual total 15.39"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 817

Heating degree days How much heating the climate demands 6,189

Approximate annual cooling cost At 16.16¢/kWh, Colorado average $132

Approximate annual electric heating cost Lower where heating is gas rather than electric $350

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Washington County, where electricity is one line of eight.

Common questions

What is the weather like in Washington County?

Washington County averages a high of 88.7°F in July and a low of 17.2°F in January. Annual precipitation is 15.39 inches, with essentially no snow.

When is the rainy season in Washington County?

The wettest stretch is May, Jun, Jul, which accounts for 50% of the year's precipitation. That is a pronounced wet season rather than rain spread evenly through the year.

How hot does it get in Washington County?

The average daily high in July, the hottest month, is 88.7°F. That drives 817 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Washington County?

Effectively no. Measurable snowfall is rare in Washington County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station AKRON WASHINGTON CO AP, CO US (USW00024015), 13.9 miles from the county centroid.
Heating and cooling degree days — NOAA, same station and period.
Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Colorado residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.