Jefferson County climate

Jefferson County Weather in August

NOAA 1991-2020 normals for Evergreen, 8 km from Jefferson County

Average highs run from 81°F on August 1 to 77°F on August 31, and lows from 50°F to 44°F. Normal precipitation for the month is 2.30 in over about 12 wet days.

August day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Jefferson County, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
79°F
Average low
47°F
Precipitation
2.30 in
Record high
100°FAug 1, 2008
Record low
38°FAug 26, 2014
Chance of a freeze
4%
Days of 90°F or more
0.9
Daylight
14 h 13 min to 13 h 05 min
Cloud cover
50%
Humidity
47%
Dew point
44°F
Wind
7.4 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Aug 181°F50°F100°F 200849°F 200941%0%
Aug 281°F50°F100°F 202650°F 199841%0%
Aug 381°F49°F98°F 202653°F 201741%0%
Aug 481°F49°F97°F 202453°F 200941%0%
Aug 580°F49°F97°F 202251°F 202641%0%
Aug 680°F49°F96°F 202650°F 200041%0%
Aug 780°F49°F96°F 200350°F 199841%0%
Aug 880°F49°F99°F 202654°F 200540%0%
Aug 980°F49°F96°F 200052°F 201340%0%
Aug 1080°F48°F93°F 201652°F 201340%0%
Aug 1180°F48°F95°F 200051°F 202540%0%
Aug 1280°F48°F92°F 200750°F 200439%0%
Aug 1380°F48°F95°F 202046°F 200239%0%
Aug 1479°F48°F95°F 202550°F 200439%0%
Aug 1579°F48°F95°F 201548°F 200839%0%
Aug 1679°F47°F98°F 200249°F 200838%
Aug 1779°F47°F95°F 202046°F 200938%
Aug 1879°F47°F97°F 202049°F 200838%
Aug 1979°F47°F96°F 201948°F 201637%
Aug 2079°F47°F97°F 201945°F 201837%
Aug 2179°F46°F96°F 202650°F 200937%
Aug 2278°F46°F95°F 200950°F 200536%
Aug 2378°F46°F97°F 202047°F 201536%
Aug 2478°F46°F97°F 201150°F 201635%
Aug 2578°F46°F95°F 201945°F 201635%
Aug 2678°F45°F93°F 201538°F 201435%
Aug 2778°F45°F94°F 201145°F 200434%
Aug 2878°F45°F94°F 201242°F 200434%
Aug 2977°F45°F93°F 201346°F 200633%
Aug 3077°F45°F93°F 201250°F 200233%
Aug 3177°F44°F95°F 201145°F 202032%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Jefferson County, in percent, and of at least 0.1 inch of snowfall.010203040501102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

August 1
sunrise 6:01 AM, sunset 8:14 PM
August 31
sunrise 6:28 AM, sunset 7:33 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00052790 (Evergreen), public domain. Records: NOAA GHCN-Daily, station USW00093067, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.