Dumbarton climate

Dumbarton Weather in August

NOAA 1991-2020 normals for Ashland Hanover CO Muni AP, 12.6 km from Dumbarton

Average highs run from 88°F on August 1 to 85°F on August 31, and lows from 68°F to 64°F. Normal precipitation for the month is 4.93 in over about 13 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 Dumbarton, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
87°F
Average low
66°F
Precipitation
4.93 in
Record high
103°FAug 9, 2007
Record low
50°FAug 20, 1998
Chance of a freeze
0%
Days of 90°F or more
11.6
Daylight
14 h 04 min to 13 h 01 min
Cloud cover
55%
Humidity
70%
Dew point
65°F
Wind
4.3 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 188°F68°F100°F 199955°F 199743%0%
Aug 288°F68°F101°F 200656°F 199842%0%
Aug 388°F68°F102°F 200652°F 199842%0%
Aug 488°F68°F98°F 200254°F 199842%0%
Aug 588°F67°F100°F 200255°F 199842%0%
Aug 688°F67°F95°F 200754°F 200442%0%
Aug 788°F67°F98°F 200653°F 200442%0%
Aug 888°F67°F102°F 200754°F 200242%0%
Aug 988°F67°F103°F 200754°F 200242%0%
Aug 1088°F67°F100°F 201055°F 199942%0%
Aug 1188°F67°F98°F 200257°F 199642%0%
Aug 1287°F67°F101°F 200258°F 200842%0%
Aug 1387°F67°F101°F 200255°F 200642%0%
Aug 1487°F67°F99°F 200256°F 201342%0%
Aug 1587°F66°F98°F 200254°F 201342%0%
Aug 1687°F66°F99°F 199753°F 201342%0%
Aug 1787°F66°F100°F 199758°F 200842%0%
Aug 1887°F66°F98°F 200257°F 200742%0%
Aug 1987°F66°F99°F 200252°F 199842%0%
Aug 2087°F66°F97°F 200950°F 199842%0%
Aug 2187°F66°F95°F 200552°F 200041%0%
Aug 2286°F66°F96°F 200253°F 202441%0%
Aug 2386°F65°F102°F 200252°F 199741%0%
Aug 2486°F65°F100°F 199853°F 199741%0%
Aug 2586°F65°F100°F 199856°F 199741%0%
Aug 2686°F65°F97°F 200655°F 201341%0%
Aug 2786°F65°F95°F 200357°F 201440%0%
Aug 2886°F65°F98°F 200656°F 201540%0%
Aug 2985°F64°F97°F 199857°F 202540%0%
Aug 3085°F64°F97°F 201058°F 199740%0%
Aug 3185°F64°F96°F 199857°F 201140%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Dumbarton, 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 (EDT).

August 1
sunrise 6:14 AM, sunset 8:18 PM
August 31
sunrise 6:39 AM, sunset 7:40 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00093775 (Ashland Hanover CO Muni AP), public domain. Records: NOAA GHCN-Daily, station USW00093775, 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.