Keystone Weather in December
Average highs run from 73°F on December 1 to 70°F on December 31, and lows from 56°F to 51°F. Normal precipitation for the month is 2.74 in over about 7 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
- 71°F
- Average low
- 54°F
- Precipitation
- 2.74 in
- Record high
- 86°FDec 1, 1991
- Record low
- 18°FDec 13, 1962
- Chance of a freeze
- 16%
- Daylight
- 10 h 29 min to 10 h 23 min
- Cloud cover
- 54%
- Humidity
- 80%
- Dew point
- 56°F
- Wind
- 9.4 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 73°F | 56°F | 86°F 1991 | 32°F 1964 | 20% |
| Dec 2 | 73°F | 56°F | 86°F 1991 | 36°F 1966 | 21% |
| Dec 3 | 73°F | 55°F | 85°F 1994 | 39°F 1944 | 21% |
| Dec 4 | 73°F | 55°F | 86°F 1994 | 33°F 1989 | 21% |
| Dec 5 | 73°F | 55°F | 84°F 1972 | 35°F 1974 | 21% |
| Dec 6 | 73°F | 55°F | 84°F 2013 | 35°F 1963 | 21% |
| Dec 7 | 73°F | 55°F | 86°F 1978 | 35°F 1954 | 21% |
| Dec 8 | 72°F | 55°F | 86°F 1972 | 34°F 1984 | 22% |
| Dec 9 | 72°F | 55°F | 86°F 1972 | 34°F 1984 | 22% |
| Dec 10 | 72°F | 54°F | 85°F 1986 | 35°F 1955 | 22% |
| Dec 11 | 72°F | 54°F | 85°F 1976 | 31°F 1981 | 22% |
| Dec 12 | 72°F | 54°F | 85°F 1972 | 27°F 1957 | 22% |
| Dec 13 | 72°F | 54°F | 86°F 2021 | 18°F 1962 | 23% |
| Dec 14 | 72°F | 54°F | 86°F 1972 | 28°F 1962 | 23% |
| Dec 15 | 72°F | 54°F | 85°F 1961 | 33°F 1944 | 23% |
| Dec 16 | 71°F | 54°F | 86°F 2021 | 29°F 1968 | 23% |
| Dec 17 | 71°F | 53°F | 86°F 2021 | 27°F 1968 | 23% |
| Dec 18 | 71°F | 53°F | 85°F 2021 | 30°F 1973 | 24% |
| Dec 19 | 71°F | 53°F | 84°F 1956 | 30°F 1975 | 24% |
| Dec 20 | 71°F | 53°F | 86°F 1990 | 29°F 1981 | 24% |
| Dec 21 | 71°F | 53°F | 85°F 1990 | 32°F 1981 | 24% |
| Dec 22 | 71°F | 53°F | 85°F 1990 | 31°F 1973 | 24% |
| Dec 23 | 71°F | 52°F | 82°F 1948 | 28°F 1989 | 24% |
| Dec 24 | 70°F | 52°F | 85°F 2016 | 24°F 1989 | 25% |
| Dec 25 | 70°F | 52°F | 86°F 2015 | 20°F 1983 | 25% |
| Dec 26 | 70°F | 52°F | 86°F 2015 | 19°F 1983 | 25% |
| Dec 27 | 70°F | 52°F | 85°F 1990 | 28°F 1985 | 25% |
| Dec 28 | 70°F | 52°F | 84°F 1990 | 32°F 2010 | 25% |
| Dec 29 | 70°F | 52°F | 85°F 1990 | 33°F 2010 | 25% |
| Dec 30 | 70°F | 51°F | 84°F 1990 | 33°F 1961 | 26% |
| Dec 31 | 70°F | 51°F | 83°F 1984 | 30°F 2000 | 26% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EST).
- December 1
- sunrise 7:05 AM, sunset 5:34 PM
- December 31
- sunrise 7:22 AM, sunset 5:45 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00088824 (Tarpon Spgs Sewage Plt), public domain. Records: NOAA GHCN-Daily, station USW00012842, 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.