Olean Weather in December
Average highs run from 42°F on December 1 to 33°F on December 31, and lows from 25°F to 16°F. Normal precipitation for the month is 3.22 in over about 18 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
- 37°F
- Average low
- 21°F
- Precipitation
- 3.22 in
- Snowfall
- 14.9 in
- Record high
- 71°FDec 4, 1982
- Record low
- -28°FDec 21, 1942
- Chance of a freeze
- 100%
- Daylight
- 9 h 21 min to 9 h 10 min
- Cloud cover
- 81%
- Humidity
- 91%
- Dew point
- 24°F
- Wind
- 6.9 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 | 42°F | 25°F | 65°F 1991 | -25°F 1936 | 54% | 22% |
| Dec 2 | 41°F | 25°F | 59°F 1962 | -6°F 1971 | 55% | 22% |
| Dec 3 | 41°F | 25°F | 63°F 1982 | -14°F 1976 | 55% | 23% |
| Dec 4 | 41°F | 24°F | 71°F 1982 | -16°F 1966 | 55% | 23% |
| Dec 5 | 40°F | 24°F | 64°F 2012 | -8°F 2025 | 56% | 24% |
| Dec 6 | 40°F | 24°F | 69°F 2001 | -8°F 2025 | 56% | 24% |
| Dec 7 | 40°F | 24°F | 67°F 1998 | -12°F 1899 | 56% | 25% |
| Dec 8 | 39°F | 23°F | 61°F 1966 | -9°F 1931 | 56% | 25% |
| Dec 9 | 39°F | 23°F | 61°F 1966 | -17°F 1934 | 57% | 26% |
| Dec 10 | 39°F | 23°F | 59°F 1897 | -22°F 1968 | 57% | 26% |
| Dec 11 | 38°F | 22°F | 59°F 1897 | -16°F 1960 | 57% | 27% |
| Dec 12 | 38°F | 22°F | 61°F 2021 | -24°F 1988 | 57% | 27% |
| Dec 13 | 38°F | 22°F | 57°F 2015 | -23°F 1988 | 58% | 27% |
| Dec 14 | 38°F | 22°F | 62°F 2015 | -12°F 1900 | 58% | 28% |
| Dec 15 | 37°F | 21°F | 65°F 2015 | -22°F 1904 | 58% | 28% |
| Dec 16 | 37°F | 21°F | 57°F 1971 | -17°F 1904 | 58% | 29% |
| Dec 17 | 37°F | 21°F | 59°F 2021 | -16°F 1953 | 58% | 29% |
| Dec 18 | 36°F | 20°F | 54°F 2006 | -9°F 1953 | 58% | 30% |
| Dec 19 | 36°F | 20°F | 55°F 1957 | -9°F 1965 | 59% | 30% |
| Dec 20 | 36°F | 20°F | 60°F 1957 | -17°F 1942 | 59% | 30% |
| Dec 21 | 36°F | 19°F | 58°F 1967 | -28°F 1942 | 59% | 31% |
| Dec 22 | 35°F | 19°F | 64°F 2013 | -23°F 1958 | 59% | 31% |
| Dec 23 | 35°F | 19°F | 62°F 2013 | -18°F 1943 | 59% | 32% |
| Dec 24 | 35°F | 18°F | 62°F 2015 | -17°F 1960 | 59% | 32% |
| Dec 25 | 35°F | 18°F | 62°F 1932 | -28°F 1980 | 59% | 32% |
| Dec 26 | 34°F | 18°F | 60°F 1982 | -27°F 1980 | 60% | 33% |
| Dec 27 | 34°F | 17°F | 59°F 1936 | -22°F 1950 | 60% | 33% |
| Dec 28 | 34°F | 17°F | 60°F 2008 | -23°F 1960 | 60% | 34% |
| Dec 29 | 34°F | 17°F | 63°F 1982 | -27°F 1935 | 60% | 34% |
| Dec 30 | 33°F | 16°F | 58°F 1984 | -18°F 1978 | 60% | 34% |
| Dec 31 | 33°F | 16°F | 56°F 1965 | -12°F 1976 | 60% | 35% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EST).
- December 1
- sunrise 7:22 AM, sunset 4:43 PM
- December 31
- sunrise 7:42 AM, sunset 4:52 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00306196 (Olean), public domain. Records: NOAA GHCN-Daily, station USC00303025, 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.