Lewiston weather in December: Lewiston, Idaho: normal highs, lows, rain and records for December
Lewiston in December has a normal high of 41°F and a normal low of 30°F, a daily mean of 35°F, falling from 43°F on the 1st to 40°F by the 31st. Measurable precipitation falls on 11 days in a normal December, 1.13 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 5°C and low of −1°C, 29 mm of precipitation and 10 cm of snow in December.
- NOAA stationLewiston Airport
- Station IDUSW00024149
- Location46.37°N 117.02°W
- Elevation1,436 ft (438 m)
- Population34,693
- Jan 42° 30°
- Feb 47° 32°
- Mar 55° 36°
- Apr 62° 41°
- May 72° 48°
- Jun 79° 54°
- Jul 91° 61°
- Aug 90° 60°
- Sep 80° 52°
- Oct 63° 42°
- Nov 49° 35°
- Dec 41° 30°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Lewiston in December?
The normal high is 41°F and the normal low 30°F, for a daily mean of 35.2°F. December is 6.4°F cooler than November and 1.0°F cooler than January. December is the 12th warmest month of the year in Lewiston and the 6th wettest, and the snowiest. Across the month the normal high falls 3°F, from 43°F on December 1 to 40°F on December 31. From one year to the next December's mean temperature typically moves about 2.9°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 32°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 37%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 43°F | 31°F | 37% | 14% |
| December 8 | 42°F | 30°F | 37% | 14% |
| December 15 | 40°F | 29°F | 37% | 13% |
| December 22 | 40°F | 29°F | 37% | 13% |
| December 31 | 40°F | 29°F | 37% | 12% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 23)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 43°F | 31°F | 37% | 14% | 8 h 50 min |
| December 2 | 43°F | 31°F | 37% | 14% | 8 h 50 min |
| December 3 | 43°F | 31°F | 37% | 14% | 8 h 50 min |
| December 4 | 43°F | 31°F | 37% | 14% | 8 h 50 min |
| December 5 | 42°F | 31°F | 37% | 14% | 8 h 50 min |
| December 6 | 42°F | 31°F | 37% | 14% | 8 h 50 min |
| December 7 | 42°F | 30°F | 37% | 14% | 8 h 50 min |
| December 8 | 42°F | 30°F | 37% | 14% | 8 h 40 min |
| December 9 | 41°F | 30°F | 37% | 14% | 8 h 40 min |
| December 10 | 41°F | 30°F | 37% | 14% | 8 h 40 min |
| December 11 | 41°F | 30°F | 37% | 13% | 8 h 40 min |
| December 12 | 41°F | 30°F | 37% | 13% | 8 h 40 min |
| December 13 | 41°F | 29°F | 37% | 13% | 8 h 40 min |
| December 14 | 41°F | 29°F | 37% | 13% | 8 h 40 min |
| December 15 | 40°F | 29°F | 37% | 13% | 8 h 40 min |
| December 16 | 40°F | 29°F | 36% | 13% | 8 h 40 min |
| December 17 | 40°F | 29°F | 36% | 13% | 8 h 40 min |
| December 18 | 40°F | 29°F | 36% | 13% | 8 h 40 min |
| December 19 | 40°F | 29°F | 36% | 13% | 8 h 40 min |
| December 20 | 40°F | 29°F | 36% | 13% | 8 h 40 min |
| December 21 | 40°F | 29°F | 36% | 13% | 8 h 40 min |
| December 22 | 40°F | 29°F | 37% | 13% | 8 h 40 min |
| December 23 | 40°F | 29°F | 37% | 13% | 8 h 40 min |
| December 24 | 40°F | 29°F | 37% | 13% | 8 h 40 min |
| December 25 | 40°F | 29°F | 37% | 13% | 8 h 40 min |
| December 26 | 40°F | 29°F | 37% | 13% | 8 h 40 min |
| December 27 | 40°F | 29°F | 37% | 12% | 8 h 40 min |
| December 28 | 40°F | 29°F | 37% | 12% | 8 h 40 min |
| December 29 | 40°F | 29°F | 37% | 12% | 8 h 40 min |
| December 30 | 40°F | 29°F | 37% | 12% | 8 h 40 min |
| December 31 | 40°F | 29°F | 37% | 12% | 8 h 40 min |
- Normal high
- 41°FDecember average
- Normal low
- 30°FDecember average
- Precipitation
- 1.13 inmonth total
- Days with precipitation
- 110.01 inch or more
- Snowfall
- 4.1 inmonth total
- Nights at 32°F or colder
- 20
- Daylight
- 8 h 50 min to 8 h 40 minDecember 1 to December 31
- Sunshine
- 55%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024149; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Lewiston in December?
On a given December day the chance of 0.01 inch or more is 37% on average, highest around December 31 (37%). In all, 1.13 in falls on 11 days of a normal December.
In a normal December in Lewiston, 20 nights fall to freezing, 5 days stay below freezing all day and snowfall averages 4.1 inches.
Snow falls on 4 days in a normal December, and an inch or more covers the ground on 3 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024149.
How humid and windy is Lewiston in December?
At 3 p.m. the normal temperature is 37°F with 67% relative humidity and a dew point of 28°F; at 6 a.m. it is 32°F with 78% humidity. The wind averages 6.1 mph, most often from the south in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 32°F | 26°F | 78% | 5.7 mph | – |
| 9 a.m. | 33°F | 26°F | 76% | 6.1 mph | – |
| noon | 37°F | 27°F | 68% | 6.9 mph | – |
| 3 p.m. | 37°F | 28°F | 67% | 7.2 mph | – |
| 6 p.m. | 35°F | 27°F | 74% | 6.0 mph | – |
| 9 p.m. | 34°F | 27°F | 76% | 5.7 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024149. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for December in Lewiston?
The warmest December temperature on Lewiston's official record (since 1881) is 67°F, on December 12, 1921; the coldest is −23°F, on December 13, 1919. The wettest December brought 4.88 in (1882); the snowiest, 19.7 inches (2016).
The December mean against the 1991-2020 normal of 35.2°F: 2021 34.9°F (−0.3), 2022 32.0°F (−3.2), 2023 40.7°F (+5.5), 2024 39.3°F (+4.1), 2025 42.6°F (+7.4). 3 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 34.9°F | −0.3°F | 1.77 in |
| 2022 | 32.0°F | −3.2°F | 1.19 in |
| 2023 | 40.7°F | +5.5°F | 1.22 in |
| 2024 | 39.3°F | +4.1°F | 1.43 in |
| 2025 | 42.6°F | +7.4°F | 1.57 in |
Source: records: ACIS, NWS threaded record LWSthr; recent months: ACIS, station USW00024149. Records and recent months use complete months only.
How does December in Lewiston compare across Idaho?
Across the 85 places PlainClimate covers in Idaho, December normal highs run from 26°F in Island Park to 44°F in Glenns Ferry; Lewiston's is 41°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.