West Chester weather in December: West Chester, Pennsylvania: normal highs, lows, rain and records for December
West Chester in December has a normal high of 44°F and a normal low of 25°F, a daily mean of 35°F, falling from 49°F on the 1st to 41°F by the 31st. Measurable precipitation falls on 11 days in a normal December, 4.72 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 7°C and low of −4°C, 120 mm of precipitation and 11 cm of snow in December.
- NOAA stationWest Chester (2 mi NW)
- Station IDUSC00369464
- Location39.97°N 75.64°W
- Elevation375 ft (114 m)
- From the center2 miles
- Population22,758
- Jan 40° 20°
- Feb 43° 21°
- Mar 51° 29°
- Apr 63° 38°
- May 73° 49°
- Jun 82° 59°
- Jul 86° 64°
- Aug 84° 62°
- Sep 78° 54°
- Oct 66° 41°
- Nov 55° 32°
- Dec 44° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is West Chester in December?
The normal high is 44°F and the normal low 25°F, for a daily mean of 34.8°F. December is 8.6°F cooler than November and 5.2°F warmer than January. December is the 10th warmest month of the year in West Chester and the 4th wettest. Across the month the normal high falls 8°F, from 49°F on December 1 to 41°F on December 31. From one year to the next December's mean temperature typically moves about 4.0°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 31°F and 39°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 37%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 49°F | 28°F | 36% | 23% |
| December 8 | 47°F | 27°F | 37% | 24% |
| December 15 | 44°F | 25°F | 37% | 23% |
| December 22 | 43°F | 24°F | 36% | 22% |
| December 31 | 41°F | 22°F | 35% | 21% |
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 | 49°F | 28°F | 36% | 23% | 9 h 30 min |
| December 2 | 49°F | 28°F | 36% | 24% | 9 h 30 min |
| December 3 | 48°F | 28°F | 36% | 24% | 9 h 30 min |
| December 4 | 48°F | 28°F | 36% | 24% | 9 h 30 min |
| December 5 | 48°F | 28°F | 37% | 24% | 9 h 30 min |
| December 6 | 47°F | 27°F | 37% | 24% | 9 h 30 min |
| December 7 | 47°F | 27°F | 37% | 24% | 9 h 30 min |
| December 8 | 47°F | 27°F | 37% | 24% | 9 h 30 min |
| December 9 | 46°F | 27°F | 37% | 24% | 9 h 30 min |
| December 10 | 46°F | 27°F | 37% | 24% | 9 h 20 min |
| December 11 | 46°F | 26°F | 37% | 24% | 9 h 20 min |
| December 12 | 45°F | 26°F | 37% | 23% | 9 h 20 min |
| December 13 | 45°F | 26°F | 37% | 23% | 9 h 20 min |
| December 14 | 45°F | 26°F | 37% | 23% | 9 h 20 min |
| December 15 | 44°F | 25°F | 37% | 23% | 9 h 20 min |
| December 16 | 44°F | 25°F | 37% | 23% | 9 h 20 min |
| December 17 | 44°F | 25°F | 36% | 23% | 9 h 20 min |
| December 18 | 44°F | 25°F | 36% | 23% | 9 h 20 min |
| December 19 | 43°F | 25°F | 36% | 23% | 9 h 20 min |
| December 20 | 43°F | 24°F | 36% | 23% | 9 h 20 min |
| December 21 | 43°F | 24°F | 36% | 22% | 9 h 20 min |
| December 22 | 43°F | 24°F | 36% | 22% | 9 h 20 min |
| December 23 | 42°F | 24°F | 36% | 22% | 9 h 20 min |
| December 24 | 42°F | 24°F | 36% | 22% | 9 h 20 min |
| December 25 | 42°F | 23°F | 36% | 22% | 9 h 20 min |
| December 26 | 42°F | 23°F | 36% | 22% | 9 h 20 min |
| December 27 | 42°F | 23°F | 36% | 22% | 9 h 20 min |
| December 28 | 41°F | 23°F | 35% | 22% | 9 h 20 min |
| December 29 | 41°F | 22°F | 35% | 22% | 9 h 20 min |
| December 30 | 41°F | 22°F | 35% | 21% | 9 h 20 min |
| December 31 | 41°F | 22°F | 35% | 21% | 9 h 20 min |
- Normal high
- 44°FDecember average
- Normal low
- 25°FDecember average
- Precipitation
- 4.72 inmonth total
- Days with precipitation
- 110.01 inch or more
- Snowfall
- 4.4 inmonth total
- Nights at 32°F or colder
- 25
- Daylight
- 9 h 30 min to 9 h 20 minDecember 1 to December 31
- Sunshine
- 68%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00369464; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in West Chester in December?
On a given December day the chance of 0.01 inch or more is 36% on average, highest around December 9 (37%). In all, 4.72 in falls on 11 days of a normal December, 2 of them with an inch or more.
In a normal December in West Chester, 25 nights fall to freezing, 3 days stay below freezing all day and snowfall averages 4.4 inches.
Snow falls on 2 days in a normal December, and an inch or more covers the ground on 4 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00369464.
What are the records for December in West Chester?
The warmest December temperature on this station's record (since 1893) is 78°F, on December 6, 2001; the coldest is −12°F, on December 30, 1917. The wettest December brought 9.05 in (1983); the snowiest, 37.0 inches (1966).
Source: records: ACIS, station USC00369464. Records and recent months use complete months only.
How does December in West Chester 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; West Chester's is 44°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- West Chester in November55°F by day, 32°F at night
- West Chester in January40°F by day, 20°F at night
- West Chester 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