Jefferson County climate

Jefferson County Weather in April

NOAA 1991-2020 normals for Boulder, 9.3 km from Jefferson County

Average highs run from 51°F on April 1 to 58°F on April 30, and lows from 25°F to 30°F. Normal precipitation for the month is 0.78 in over about 7 wet days.

April 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.-20020406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

April at a glance

Average high
55°F
Average low
27°F
Precipitation
0.78 in
Record high
83°FApr 25, 1910
Record low
-16°FApr 8, 1982
Chance of a freeze
100%
Daylight
12 h 49 min to 14 h 20 min
Cloud cover
71%
Humidity
67%
Dew point
26°F
Wind
6.9 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation.

DateNormal highNormal lowRecord highRecord lowChance wet
Apr 151°F25°F67°F 1966-13°F 193623%
Apr 252°F25°F70°F 1992-8°F 193623%
Apr 352°F25°F69°F 19921°F 196823%
Apr 452°F25°F69°F 19143°F 193623%
Apr 552°F25°F70°F 19593°F 202323%
Apr 652°F25°F75°F 1930-1°F 199723%
Apr 753°F26°F71°F 1930-6°F 198224%
Apr 853°F26°F73°F 1996-16°F 198224%
Apr 953°F26°F75°F 19961°F 197524%
Apr 1053°F26°F72°F 1985-1°F 197524%
Apr 1153°F26°F72°F 20123°F 195324%
Apr 1254°F26°F72°F 19082°F 197524%
Apr 1354°F26°F74°F 1908-6°F 202224%
Apr 1454°F27°F75°F 19858°F 202225%
Apr 1554°F27°F74°F 1926-1°F 202225%
Apr 1654°F27°F74°F 19362°F 189625%
Apr 1755°F27°F75°F 193611°F 189625%
Apr 1855°F27°F75°F 19106°F 194125%
Apr 1955°F27°F78°F 1962-3°F 194125%
Apr 2055°F28°F77°F 19801°F 200826%
Apr 2156°F28°F76°F 19063°F 200826%
Apr 2256°F28°F76°F 20127°F 200126%
Apr 2356°F28°F77°F 201210°F 201326%
Apr 2457°F29°F77°F 191013°F 195827%
Apr 2557°F29°F83°F 191012°F 196027%
Apr 2657°F29°F76°F 199218°F 195827%
Apr 2758°F29°F80°F 198715°F 190128%
Apr 2858°F30°F78°F 198712°F 190728%
Apr 2958°F30°F81°F 192612°F 200528%
Apr 3058°F30°F79°F 19269°F 195029%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Jefferson County, in percent.01020301102030
  • Chance of a wet day

Sunrise and sunset

Times for 2026, local time (MDT).

April 1
sunrise 7:08 AM, sunset 7:57 PM
April 30
sunrise 6:16 AM, sunset 8:36 PM

Every day of April: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00241008 (Boulder), public domain. Records: NOAA GHCN-Daily, station USW00024135, 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.