Olean weather in December: Olean, New York: normal highs, lows, rain and records for December
Olean in December has a normal high of 37°F and a normal low of 21°F, a daily mean of 29°F, falling from 42°F on the 1st to 33°F by the 31st. Measurable precipitation falls on 18 days in a normal December, 3.22 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 3°C and low of −6°C, 82 mm of precipitation and 38 cm of snow in December.
- NOAA stationOlean
- Station IDUSC00306196
- Location42.07°N 78.45°W
- Elevation1,420 ft (433 m)
- From the center1 miles
- Population13,614
- Jan 32° 13°
- Feb 34° 15°
- Mar 43° 21°
- Apr 57° 32°
- May 68° 44°
- Jun 76° 53°
- Jul 80° 57°
- Aug 79° 55°
- Sep 73° 49°
- Oct 60° 38°
- Nov 47° 29°
- Dec 37° 21°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Olean in December?
The normal high is 37°F and the normal low 21°F, for a daily mean of 28.9°F. December is 9.0°F cooler than November and 6.5°F warmer than January. December is the 10th warmest month of the year in Olean and the 8th wettest. Across the month the normal high falls 9°F, from 42°F on December 1 to 33°F on December 31. From one year to the next December's mean temperature typically moves about 4.2°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 25°F and 33°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 60%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 42°F | 25°F | 54% | 26% |
| December 8 | 39°F | 23°F | 56% | 26% |
| December 15 | 37°F | 21°F | 58% | 26% |
| December 22 | 35°F | 19°F | 59% | 25% |
| December 31 | 33°F | 16°F | 60% | 24% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 42°F | 25°F | 54% | 26% | 9 h 20 min |
| December 2 | 41°F | 25°F | 55% | 26% | 9 h 20 min |
| December 3 | 41°F | 25°F | 55% | 26% | 9 h 20 min |
| December 4 | 41°F | 24°F | 55% | 26% | 9 h 20 min |
| December 5 | 40°F | 24°F | 56% | 26% | 9 h 20 min |
| December 6 | 40°F | 24°F | 56% | 26% | 9 h 20 min |
| December 7 | 40°F | 24°F | 56% | 26% | 9 h 10 min |
| December 8 | 39°F | 23°F | 56% | 26% | 9 h 10 min |
| December 9 | 39°F | 23°F | 57% | 26% | 9 h 10 min |
| December 10 | 39°F | 23°F | 57% | 26% | 9 h 10 min |
| December 11 | 38°F | 22°F | 57% | 26% | 9 h 10 min |
| December 12 | 38°F | 22°F | 57% | 26% | 9 h 10 min |
| December 13 | 38°F | 22°F | 58% | 26% | 9 h 10 min |
| December 14 | 38°F | 22°F | 58% | 26% | 9 h 10 min |
| December 15 | 37°F | 21°F | 58% | 26% | 9 h 10 min |
| December 16 | 37°F | 21°F | 58% | 26% | 9 h 10 min |
| December 17 | 37°F | 21°F | 58% | 26% | 9 h 10 min |
| December 18 | 36°F | 20°F | 58% | 26% | 9 h 10 min |
| December 19 | 36°F | 20°F | 59% | 26% | 9 h 10 min |
| December 20 | 36°F | 20°F | 59% | 25% | 9 h 10 min |
| December 21 | 36°F | 19°F | 59% | 25% | 9 h 10 min |
| December 22 | 35°F | 19°F | 59% | 25% | 9 h 10 min |
| December 23 | 35°F | 19°F | 59% | 25% | 9 h 10 min |
| December 24 | 35°F | 18°F | 59% | 25% | 9 h 10 min |
| December 25 | 35°F | 18°F | 59% | 25% | 9 h 10 min |
| December 26 | 34°F | 18°F | 60% | 25% | 9 h 10 min |
| December 27 | 34°F | 17°F | 60% | 25% | 9 h 10 min |
| December 28 | 34°F | 17°F | 60% | 25% | 9 h 10 min |
| December 29 | 34°F | 17°F | 60% | 25% | 9 h 10 min |
| December 30 | 33°F | 16°F | 60% | 24% | 9 h 10 min |
| December 31 | 33°F | 16°F | 60% | 24% | 9 h 10 min |
- Normal high
- 37°FDecember average
- Normal low
- 21°FDecember average
- Precipitation
- 3.22 inmonth total
- Days with precipitation
- 180.01 inch or more
- Snowfall
- 14.9 inmonth total
- Nights at 32°F or colder
- 26
- Daylight
- 9 h 20 min to 9 h 10 minDecember 1 to December 31
- Sunshine
- 48%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00306196; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Olean in December?
On a given December day the chance of 0.01 inch or more is 58% on average, highest around December 31 (60%). In all, 3.22 in falls on 18 days of a normal December.
In a normal December in Olean, 26 nights fall to freezing, 9 days stay below freezing all day and snowfall averages 14.9 inches.
Snow falls on 9 days in a normal December, and an inch or more covers the ground on 15 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00306196.
What are the records for December in Olean?
The December mean against the 1991-2020 normal of 28.9°F: 2021 35.2°F (+6.3), 2022 27.9°F (−1.0), 2023 36.3°F (+7.4), 2024 28.7°F (−0.2), 2025 23.9°F (−5.0). 2 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 35.2°F | +6.3°F | 2.45 in |
| 2022 | 27.9°F | −1.0°F | 3.05 in |
| 2023 | 36.3°F | +7.4°F | 2.93 in |
| 2024 | 28.7°F | −0.2°F | 2.92 in |
| 2025 | 23.9°F | −5.0°F | 3.02 in |
Source: recent months: ACIS, station USC00306196. Records and recent months use complete months only.
How does December in Olean compare across New York?
Across the 131 places PlainClimate covers in New York, December normal highs run from 29°F in Lake Placid to 47°F in Wantagh; Olean's is 37°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.