Washington weather in December: Washington, Pennsylvania: normal highs, lows, rain and records for December
Washington in December has a normal high of 41°F and a normal low of 26°F, a daily mean of 34°F, falling from 46°F on the 1st to 38°F by the 31st. Measurable precipitation falls on 15 days in a normal December, 3.32 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 5°C and low of −3°C, 84 mm of precipitation and 15 cm of snow in December.
- NOAA stationWashington (3 mi NE)
- Station IDUSC00369318
- Location40.18°N 80.19°W
- Elevation1,300 ft (396 m)
- From the center3 miles
- Population13,334
- Jan 37° 20°
- Feb 40° 22°
- Mar 49° 29°
- Apr 63° 40°
- May 72° 49°
- Jun 80° 58°
- Jul 83° 62°
- Aug 83° 60°
- Sep 76° 54°
- Oct 64° 43°
- Nov 52° 33°
- Dec 41° 26°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Washington in December?
The normal high is 41°F and the normal low 26°F, for a daily mean of 33.7°F. December is 9.0°F cooler than November and 5.3°F warmer than January. December is the 10th warmest month of the year in Washington and the 7th wettest. Across the month the normal high falls 8°F, from 46°F on December 1 to 38°F on December 31. From one year to the next December's mean temperature typically moves about 4.7°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 29°F and 38°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 50%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 46°F | 29°F | 46% | 26% |
| December 8 | 43°F | 28°F | 47% | 26% |
| December 15 | 41°F | 26°F | 48% | 25% |
| December 22 | 40°F | 25°F | 49% | 24% |
| December 31 | 38°F | 23°F | 50% | 23% |
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 | 46°F | 29°F | 46% | 26% | 9 h 30 min |
| December 2 | 45°F | 29°F | 46% | 26% | 9 h 30 min |
| December 3 | 45°F | 29°F | 46% | 26% | 9 h 30 min |
| December 4 | 45°F | 29°F | 47% | 26% | 9 h 30 min |
| December 5 | 44°F | 28°F | 47% | 26% | 9 h 30 min |
| December 6 | 44°F | 28°F | 47% | 26% | 9 h 30 min |
| December 7 | 44°F | 28°F | 47% | 26% | 9 h 30 min |
| December 8 | 43°F | 28°F | 47% | 26% | 9 h 30 min |
| December 9 | 43°F | 27°F | 47% | 25% | 9 h 20 min |
| December 10 | 43°F | 27°F | 48% | 25% | 9 h 20 min |
| December 11 | 43°F | 27°F | 48% | 25% | 9 h 20 min |
| December 12 | 42°F | 27°F | 48% | 25% | 9 h 20 min |
| December 13 | 42°F | 27°F | 48% | 25% | 9 h 20 min |
| December 14 | 42°F | 26°F | 48% | 25% | 9 h 20 min |
| December 15 | 41°F | 26°F | 48% | 25% | 9 h 20 min |
| December 16 | 41°F | 26°F | 48% | 25% | 9 h 20 min |
| December 17 | 41°F | 26°F | 48% | 24% | 9 h 20 min |
| December 18 | 41°F | 26°F | 49% | 24% | 9 h 20 min |
| December 19 | 40°F | 25°F | 49% | 24% | 9 h 20 min |
| December 20 | 40°F | 25°F | 49% | 24% | 9 h 20 min |
| December 21 | 40°F | 25°F | 49% | 24% | 9 h 20 min |
| December 22 | 40°F | 25°F | 49% | 24% | 9 h 20 min |
| December 23 | 40°F | 24°F | 49% | 24% | 9 h 20 min |
| December 24 | 39°F | 24°F | 49% | 23% | 9 h 20 min |
| December 25 | 39°F | 24°F | 49% | 23% | 9 h 20 min |
| December 26 | 39°F | 24°F | 49% | 23% | 9 h 20 min |
| December 27 | 39°F | 23°F | 49% | 23% | 9 h 20 min |
| December 28 | 39°F | 23°F | 49% | 23% | 9 h 20 min |
| December 29 | 38°F | 23°F | 49% | 23% | 9 h 20 min |
| December 30 | 38°F | 23°F | 50% | 23% | 9 h 20 min |
| December 31 | 38°F | 23°F | 50% | 23% | 9 h 20 min |
- Normal high
- 41°FDecember average
- Normal low
- 26°FDecember average
- Precipitation
- 3.32 inmonth total
- Days with precipitation
- 150.01 inch or more
- Snowfall
- 6.0 inmonth total
- Nights at 32°F or colder
- 25
- Daylight
- 9 h 30 min to 9 h 20 minDecember 1 to December 31
- Sunshine
- 52%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00369318; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Washington in December?
On a given December day the chance of 0.01 inch or more is 48% on average, highest around December 31 (50%). In all, 3.32 in falls on 15 days of a normal December, 1 of them with an inch or more.
In a normal December in Washington, 25 nights fall to freezing, 9 days stay below freezing all day and snowfall averages 6.0 inches.
Snow falls on 6 days in a normal December, and an inch or more covers the ground on 8 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00369318.
How does December in Washington compare across Pennsylvania?
Across the 108 places PlainClimate covers in Pennsylvania, December normal highs run from 34°F in Laporte to 48°F in Marcus Hook; Washington's is 41°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Washington in November52°F by day, 33°F at night
- Washington in January37°F by day, 20°F at night
- Washington through the yearEvery month, frost dates, records and recent years
- Pennsylvania in DecemberThe statewide normal and the warmest and coolest places
- Marcus Hook: Pennsylvania's warmest Decembernormal high 48°F