Slidell weather in December: Slidell, Louisiana: normal highs, lows, rain and records for December
Slidell in December has a normal high of 64°F and a normal low of 43°F, a daily mean of 54°F, falling from 67°F on the 1st to 62°F by the 31st. Measurable precipitation falls on 9 days in a normal December, 4.49 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 18°C and low of 6°C, 114 mm of precipitation in December.
- NOAA stationSlidell Airport
- Station IDUSW00053865
- Location30.34°N 89.82°W
- Elevation27 ft (8 m)
- Population28,440
- Jan 62° 41°
- Feb 66° 44°
- Mar 72° 50°
- Apr 78° 56°
- May 85° 64°
- Jun 90° 71°
- Jul 91° 73°
- Aug 91° 73°
- Sep 88° 69°
- Oct 81° 57°
- Nov 71° 47°
- Dec 64° 43°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Slidell in December?
The normal high is 64°F and the normal low 43°F, for a daily mean of 53.5°F. December is 5.3°F cooler than November and 2.1°F warmer than January. December is the 11th warmest month of the year in Slidell and the 8th wettest. Across the month the normal high falls 5°F, from 67°F on December 1 to 62°F on December 31. From one year to the next December's mean temperature typically moves about 3.3°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 50°F and 57°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 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 67°F | 44°F | 28% | 18% |
| December 8 | 66°F | 44°F | 29% | 19% |
| December 15 | 64°F | 43°F | 31% | 20% |
| December 22 | 63°F | 42°F | 32% | 21% |
| December 31 | 62°F | 41°F | 33% | 22% |
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 | 67°F | 44°F | 28% | 18% | 10 h 20 min |
| December 2 | 67°F | 44°F | 28% | 18% | 10 h 20 min |
| December 3 | 67°F | 44°F | 29% | 18% | 10 h 20 min |
| December 4 | 66°F | 44°F | 29% | 18% | 10 h 20 min |
| December 5 | 66°F | 44°F | 29% | 18% | 10 h 20 min |
| December 6 | 66°F | 44°F | 29% | 18% | 10 h 20 min |
| December 7 | 66°F | 44°F | 29% | 19% | 10 h 20 min |
| December 8 | 66°F | 44°F | 29% | 19% | 10 h 20 min |
| December 9 | 65°F | 44°F | 30% | 19% | 10 h 10 min |
| December 10 | 65°F | 43°F | 30% | 19% | 10 h 10 min |
| December 11 | 65°F | 43°F | 30% | 19% | 10 h 10 min |
| December 12 | 65°F | 43°F | 30% | 19% | 10 h 10 min |
| December 13 | 65°F | 43°F | 30% | 20% | 10 h 10 min |
| December 14 | 65°F | 43°F | 30% | 20% | 10 h 10 min |
| December 15 | 64°F | 43°F | 31% | 20% | 10 h 10 min |
| December 16 | 64°F | 43°F | 31% | 20% | 10 h 10 min |
| December 17 | 64°F | 43°F | 31% | 20% | 10 h 10 min |
| December 18 | 64°F | 43°F | 31% | 20% | 10 h 10 min |
| December 19 | 64°F | 43°F | 31% | 21% | 10 h 10 min |
| December 20 | 64°F | 42°F | 31% | 21% | 10 h 10 min |
| December 21 | 63°F | 42°F | 32% | 21% | 10 h 10 min |
| December 22 | 63°F | 42°F | 32% | 21% | 10 h 10 min |
| December 23 | 63°F | 42°F | 32% | 21% | 10 h 10 min |
| December 24 | 63°F | 42°F | 32% | 21% | 10 h 10 min |
| December 25 | 63°F | 42°F | 32% | 21% | 10 h 10 min |
| December 26 | 63°F | 42°F | 32% | 21% | 10 h 10 min |
| December 27 | 63°F | 42°F | 32% | 22% | 10 h 10 min |
| December 28 | 62°F | 42°F | 32% | 22% | 10 h 10 min |
| December 29 | 62°F | 41°F | 32% | 22% | 10 h 10 min |
| December 30 | 62°F | 41°F | 33% | 22% | 10 h 10 min |
| December 31 | 62°F | 41°F | 33% | 22% | 10 h 10 min |
- Normal high
- 64°FDecember average
- Normal low
- 43°FDecember average
- Precipitation
- 4.49 inmonth total
- Days with precipitation
- 90.01 inch or more
- Nights at 32°F or colder
- 7
- Daylight
- 10 h 20 min to 10 h 10 minDecember 1 to December 31
- Days at 70°F or more
- 11
- Days at 80°F or more
- 1
- Sunshine
- 72%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00053865; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Slidell in December?
On a given December day the chance of 0.01 inch or more is 31% on average, highest around December 31 (33%). In all, 4.49 in falls on 9 days of a normal December, 2 of them with an inch or more.
In a normal December in Slidell, 7 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00053865.
What are the records for December in Slidell?
The warmest December temperature on this station's record (since 1994) is 84°F, on December 31, 2021; the coldest is 17°F, on December 20, 1996. The wettest December brought 18.16 in (2009).
The December mean against the 1991-2020 normal of 53.5°F: 2021 64.3°F (+10.8), 2022 57.2°F (+3.7), 2023 55.4°F (+1.9), 2024 56.8°F (+3.3), 2025 54.9°F (+1.4). 5 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 64.3°F | +10.8°F | 1.97 in |
| 2022 | 57.2°F | +3.7°F | 5.97 in |
| 2023 | 55.4°F | +1.9°F | 4.35 in |
| 2024 | 56.8°F | +3.3°F | 9.17 in |
| 2025 | 54.9°F | +1.4°F | 6.49 in |
Source: records: ACIS, station USW00053865; recent months: ACIS, station USW00053865. Records and recent months use complete months only.
How does December in Slidell compare across Louisiana?
Across the 65 places PlainClimate covers in Louisiana, December normal highs run from 56°F in Bastrop to 66°F in Houma; Slidell's is 64°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.