Lebanon weather in December: Lebanon, Pennsylvania: normal highs, lows, rain and records for December
Lebanon in December has a normal high of 42°F and a normal low of 27°F, a daily mean of 34°F, falling from 46°F on the 1st to 38°F by the 31st. Measurable precipitation falls on 10 days in a normal December, 3.57 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 5°C and low of −3°C, 91 mm of precipitation and 10 cm of snow in December.
- NOAA stationLebanon (2 mi W)
- Station IDUSC00364896
- Location40.33°N 76.47°W
- Elevation450 ft (137 m)
- Population26,456
- Jan 37° 22°
- Feb 40° 23°
- Mar 49° 31°
- Apr 62° 40°
- May 72° 51°
- Jun 80° 60°
- Jul 84° 64°
- Aug 82° 63°
- Sep 76° 55°
- Oct 64° 44°
- Nov 52° 34°
- Dec 42° 27°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Lebanon in December?
The normal high is 42°F and the normal low 27°F, for a daily mean of 34.3°F. December is 8.9°F cooler than November and 4.8°F warmer than January. December is the 10th warmest month of the year in Lebanon and the 9th 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 3.9°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 30°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 34%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 46°F | 30°F | 34% | 22% |
| December 8 | 44°F | 29°F | 34% | 22% |
| December 15 | 42°F | 27°F | 34% | 22% |
| December 22 | 40°F | 26°F | 33% | 22% |
| December 31 | 38°F | 24°F | 33% | 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 | 46°F | 30°F | 34% | 22% | 9 h 30 min |
| December 2 | 46°F | 30°F | 34% | 22% | 9 h 30 min |
| December 3 | 46°F | 30°F | 34% | 22% | 9 h 30 min |
| December 4 | 45°F | 29°F | 34% | 22% | 9 h 30 min |
| December 5 | 45°F | 29°F | 34% | 22% | 9 h 30 min |
| December 6 | 44°F | 29°F | 34% | 22% | 9 h 30 min |
| December 7 | 44°F | 29°F | 34% | 22% | 9 h 30 min |
| December 8 | 44°F | 29°F | 34% | 22% | 9 h 20 min |
| December 9 | 44°F | 28°F | 34% | 22% | 9 h 20 min |
| December 10 | 43°F | 28°F | 34% | 22% | 9 h 20 min |
| December 11 | 43°F | 28°F | 34% | 22% | 9 h 20 min |
| December 12 | 43°F | 28°F | 34% | 22% | 9 h 20 min |
| December 13 | 42°F | 27°F | 34% | 22% | 9 h 20 min |
| December 14 | 42°F | 27°F | 34% | 22% | 9 h 20 min |
| December 15 | 42°F | 27°F | 34% | 22% | 9 h 20 min |
| December 16 | 41°F | 27°F | 34% | 22% | 9 h 20 min |
| December 17 | 41°F | 27°F | 34% | 22% | 9 h 20 min |
| December 18 | 41°F | 27°F | 33% | 22% | 9 h 20 min |
| December 19 | 41°F | 26°F | 33% | 22% | 9 h 20 min |
| December 20 | 40°F | 26°F | 33% | 22% | 9 h 20 min |
| December 21 | 40°F | 26°F | 33% | 22% | 9 h 20 min |
| December 22 | 40°F | 26°F | 33% | 22% | 9 h 20 min |
| December 23 | 40°F | 26°F | 33% | 22% | 9 h 20 min |
| December 24 | 40°F | 25°F | 33% | 22% | 9 h 20 min |
| December 25 | 39°F | 25°F | 33% | 22% | 9 h 20 min |
| December 26 | 39°F | 25°F | 33% | 22% | 9 h 20 min |
| December 27 | 39°F | 25°F | 33% | 22% | 9 h 20 min |
| December 28 | 39°F | 25°F | 33% | 22% | 9 h 20 min |
| December 29 | 39°F | 24°F | 33% | 22% | 9 h 20 min |
| December 30 | 38°F | 24°F | 33% | 21% | 9 h 20 min |
| December 31 | 38°F | 24°F | 33% | 21% | 9 h 20 min |
- Normal high
- 42°FDecember average
- Normal low
- 27°FDecember average
- Precipitation
- 3.57 inmonth total
- Days with precipitation
- 100.01 inch or more
- Snowfall
- 4.0 inmonth total
- Nights at 32°F or colder
- 25
- Daylight
- 9 h 30 min to 9 h 20 minDecember 1 to December 31
- Sunshine
- 60%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00364896; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Lebanon in December?
On a given December day the chance of 0.01 inch or more is 33% on average, highest around December 5 (34%). In all, 3.57 in falls on 10 days of a normal December, 1 of them with an inch or more.
In a normal December in Lebanon, 25 nights fall to freezing, 5 days stay below freezing all day and snowfall averages 4.0 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 USC00364896.
What are the records for December in Lebanon?
The warmest December temperature on this station's record (since 1965) is 75°F, on December 30, 1984; the coldest is −4°F, on December 31, 2017. The wettest December brought 8.66 in (1972); the snowiest, 26.5 inches (1969).
The December mean against the 1991-2020 normal of 34.3°F: 2021 39.4°F (+5.1), 2022 33.4°F (−0.9), 2023 38.7°F (+4.4), 2024 32.7°F (−1.6), 2025 29.8°F (−4.5). 2 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 39.4°F | +5.1°F | 0.65 in |
| 2022 | 33.4°F | −0.9°F | 4.52 in |
| 2023 | 38.7°F | +4.4°F | 6.02 in |
| 2024 | 32.7°F | −1.6°F | 4.15 in |
| 2025 | 29.8°F | −4.5°F | 2.08 in |
Source: records: ACIS, station USC00364896; recent months: ACIS, station USC00364896. Records and recent months use complete months only.
How does December in Lebanon 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; Lebanon's is 42°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Lebanon in November52°F by day, 34°F at night
- Lebanon in January37°F by day, 22°F at night
- Lebanon 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