Washington, MO County has a humid subtropical climate, with hot and humid summers and mild winters. During the summer months, temperatures can reach up to the mid-80s Fahrenheit and nighttime lows in the upper 60s. Winters are generally cool, with average highs in the low 40s and overnight lows usually ranging from the high 20s to low 30s. Precipitation throughout the year is quite consistent, averaging around 39 inches annually with most of it falling during the spring and summer months. On average, Washington County receives about 16 days of snowfall each year.
Washington County, Missouri gets 45 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Washington County averages 13 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 202 sunny days per year in Washington County. The US average is 205 sunny days.
Washington County gets some kind of precipitation, on average, 100 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 87 degrees
Winter Low: the January low is 22
Rain: averages 45 inches of rain a year
Snow: averages 13 inches of snow a year