Chester County Weather in December
Average highs run from 55°F on December 1 to 48°F on December 31, and lows from 32°F to 27°F. Normal precipitation for the month is 5.66 in over about 11 wet days.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 51°F
- Average low
- 29°F
- Precipitation
- 5.66 in
- Record high
- 77°FDec 7, 1998
- Record low
- -14°FDec 24, 1963
- Chance of a freeze
- 100%
- Daylight
- 9 h 57 min to 9 h 49 min
- Cloud cover
- 63%
- Humidity
- 84%
- Dew point
- 35°F
- Wind
- 7.6 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.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Dec 1 | 55°F | 32°F | 75°F 1970 | 11°F 1965 | 34% | |
| Dec 2 | 54°F | 32°F | 75°F 1970 | 12°F 1960 | 34% | |
| Dec 3 | 54°F | 31°F | 75°F 1970 | 15°F 1960 | 34% | |
| Dec 4 | 54°F | 31°F | 76°F 1970 | 15°F 1969 | 34% | 0% |
| Dec 5 | 53°F | 31°F | 76°F 1970 | 17°F 1969 | 35% | 0% |
| Dec 6 | 53°F | 31°F | 73°F 1998 | 17°F 2005 | 35% | 0% |
| Dec 7 | 53°F | 31°F | 77°F 1998 | 12°F 1977 | 35% | 0% |
| Dec 8 | 53°F | 30°F | 73°F 1966 | 11°F 2006 | 35% | 0% |
| Dec 9 | 52°F | 30°F | 74°F 1966 | 13°F 2006 | 35% | 0% |
| Dec 10 | 52°F | 30°F | 74°F 2007 | 7°F 1995 | 35% | 0% |
| Dec 11 | 52°F | 30°F | 75°F 2021 | 10°F 1962 | 35% | 0% |
| Dec 12 | 52°F | 30°F | 75°F 2007 | 0°F 1962 | 35% | 0% |
| Dec 13 | 51°F | 30°F | 71°F 1973 | -6°F 1962 | 35% | 0% |
| Dec 14 | 51°F | 29°F | 75°F 2015 | 8°F 1958 | 35% | 0% |
| Dec 15 | 51°F | 29°F | 75°F 1984 | 5°F 1958 | 35% | 0% |
| Dec 16 | 51°F | 29°F | 72°F 1984 | 4°F 1989 | 35% | |
| Dec 17 | 50°F | 29°F | 74°F 1984 | 9°F 1989 | 35% | |
| Dec 18 | 50°F | 29°F | 73°F 2016 | 9°F 1964 | 35% | |
| Dec 19 | 50°F | 29°F | 71°F 2006 | 3°F 1963 | 35% | |
| Dec 20 | 50°F | 28°F | 71°F 1967 | 3°F 1963 | 35% | |
| Dec 21 | 50°F | 28°F | 71°F 2013 | 10°F 1963 | 35% | |
| Dec 22 | 50°F | 28°F | 76°F 2013 | -7°F 1989 | 35% | |
| Dec 23 | 49°F | 28°F | 76°F 2013 | -7°F 1989 | 35% | |
| Dec 24 | 49°F | 28°F | 72°F 1970 | -14°F 1963 | 35% | |
| Dec 25 | 49°F | 28°F | 77°F 1964 | -14°F 1963 | 35% | |
| Dec 26 | 49°F | 28°F | 77°F 1964 | -2°F 1983 | 35% | |
| Dec 27 | 49°F | 28°F | 74°F 2016 | 12°F 1983 | 35% | |
| Dec 28 | 49°F | 28°F | 76°F 2015 | 9°F 1977 | 35% | |
| Dec 29 | 48°F | 27°F | 74°F 2021 | 10°F 1961 | 34% | |
| Dec 30 | 48°F | 27°F | 72°F 1984 | 1°F 1983 | 34% | |
| Dec 31 | 48°F | 27°F | 73°F 1984 | 2°F 1983 | 34% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- December 1
- sunrise 6:45 AM, sunset 4:42 PM
- December 31
- sunrise 7:03 AM, sunset 4:52 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00404033 (Henderson 4 W), public domain. Records: NOAA GHCN-Daily, station USC00408160, 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.