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Weather in Lewis and Clark County, Montana for December 2026

Your guide to Lewis and Clark County weather in December - trends and predictions

    Snow Forecast ❄️

  • With an average of 2 snowy days, Lewis and Clark County usually enjoys a light touch of snow in December.

    • Temperatures

  • In general, the average temperature in Lewis and Clark County at the beginning of December is 3.9 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 2.6 °F by the end of December.

    • Rain 🌧️

  • Lewis and Clark County experiences moderate rainfall in December, with an average of 7 rainy days and a total precipitation of 14.3 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
22
Dry days
Average rainy days
7
Rainy days
Average snowy days
2
Snow days
Average temperatures
4°/-4°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
71 %
Avg humidity

Lewis and Clark County Weather December

Move between months or click on a day
November
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Cloudy
1°
2
Sunny
3°
3
Partly cloudy
4°
4
Sunny
4°
5
Sunny
4°
6
Sunny
5°
7
Overcast
6°
8
Light freezing rain
4°
9
Partly cloudy
2°
10
Partly cloudy
5°
11
Overcast
6°
12
Partly cloudy
2°
13
Overcast
4°
14
Overcast
7°
15
Moderate or heavy snow showers
4°
16
Light freezing rain
3°
17
Partly cloudy
2°
18
Patchy rain possible
4°
19
Partly cloudy
2°
20
Overcast
3°
21
Overcast
3°
22
Partly cloudy
4°
23
Overcast
6°
24
Overcast
4°
25
Overcast
5°
26
Light freezing rain
4°
27
Cloudy
1°
28
Light freezing rain
0°
29
Patchy moderate snow
2°
30
Light freezing rain
3°
31
Overcast
3°

Temperatures trend during December in Lewis and Clark County

See the weather trend as well as the moving average line

December weather in Lewis and Clark County day by day

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
Dec. 1 Cloudy
Cloudy
 1° /-8° 0 mm 0 cm
Dec. 2 Sunny
Sunny
 3° /-5° 0 mm 0 cm
Dec. 3 Partly cloudy
Partly cloudy
 4° /-7° 0 mm 0 cm
Dec. 4 Sunny
Sunny
 4° /-5° 0 mm 0 cm
Dec. 5 Sunny
Sunny
 4° /-6° 2.3 mm 1.7 cm
Dec. 6 Sunny
Sunny
 5° /-4° 0 mm 0 cm
Dec. 7 Overcast
Overcast
 6° /-2° 0.3 mm 0 cm
Dec. 8 Light freezing rain
Light freezing rain
 4° /-2° 0.1 mm 0 cm
Dec. 9 Partly cloudy
Partly cloudy
 2° /-4° 0 mm 0 cm
Dec. 10 Partly cloudy
Partly cloudy
 5° /-3° 4.2 mm 2.3 cm
Dec. 11 Overcast
Overcast
 6° /-1° 0.1 mm 0 cm
Dec. 12 Partly cloudy
Partly cloudy
 2° /-4° 1.6 mm 1.2 cm
Dec. 13 Overcast
Overcast
 4° /-5° 0 mm 0 cm
Dec. 14 Overcast
Overcast
 7° /-2° 0 mm 0 cm
Dec. 15 Moderate or heavy snow showers
Moderate or heavy snow showers
 4° /-4° 3.6 mm 2.2 cm
Dec. 16 Light freezing rain
Light freezing rain
 3° /-4° 0.6 mm 0 cm
Dec. 17 Partly cloudy
Partly cloudy
 2° /-5° 2.6 mm 0 cm
Dec. 18 Patchy rain possible
Patchy rain possible
 4° /-3° 0.2 mm 0 cm
Dec. 19 Partly cloudy
Partly cloudy
 2° /-6° 0 mm 0 cm
Dec. 20 Overcast
Overcast
 3° /-5° 0 mm 0 cm
Dec. 21 Overcast
Overcast
 3° /-5° 0 mm 0 cm
Dec. 22 Partly cloudy
Partly cloudy
 4° /-2° 0.2 mm 0 cm
Dec. 23 Overcast
Overcast
 6° /-3° 0 mm 0 cm
Dec. 24 Overcast
Overcast
 4° /-2° 0 mm 0 cm
Dec. 25 Overcast
Overcast
 5° /-2° 2.3 mm 1 cm
Dec. 26 Light freezing rain
Light freezing rain
 4° /-2° 0.3 mm 0 cm
Dec. 27 Cloudy
Cloudy
 1° /-10° 0 mm 0 cm
Dec. 28 Light freezing rain
Light freezing rain
 0° /-9° 0.2 mm 0 cm
Dec. 29 Patchy moderate snow
Patchy moderate snow
 2° /-6° 1.4 mm 0.3 cm
Dec. 30 Light freezing rain
Light freezing rain
 3° /-6° 0.3 mm 0 cm
Dec. 31 Overcast
Overcast
 3° /-7° 0 mm 0 cm
Next
Important Notice
Our weather forecast for Lewis and Clark County in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Lewis and Clark County forecast closer to your planned date for the most up-to-date weather information.
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Lewis and Clark County in December - FAQ

What are the expected maximum and minimum temperatures in Lewis and Clark County during December?

Brace for cold days with temperatures not exceeding 4° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.

How much rainfall should be expected in Lewis and Clark County during December?

Expect minimal rainfall in Lewis and Clark County during December, with a total of 14.3 mm over approximately 7 days. This minimal precipitation is unlikely to significantly impact plans.

Will it snow in Lewis and Clark County in December 2026?

Lewis and Clark County experiences an average snowfall of 4.9 cm during December, occurring over 2 days.

What are the typical wind conditions in Lewis and Clark County during December?

The average wind speed in Lewis and Clark County during December is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

Lewis and Clark County snow forecast December 2026

Track daily snowfall levels and discover Lewis and Clark County’s snowy potential this December ❄️
On average, Lewis and Clark County sees 2 snowy days during December, with approximately 4.9 cm of total snowfall.

December rainfall patterns in Lewis and Clark County

Explore the daily rainfall trends and prepare for Lewis and Clark Countys December weather 💧
Typically, Lewis and Clark County has 7 rainy days in December with a total of 14.3 mm of rainfall.
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Helena
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Location coordinates Where is Lewis and Clark County?

Get accurate weather forecasts for Lewis and Clark County, located at latitude 46.593 and longitude -112.036. Stay updated with localized weather information tailored for Lewis and Clark County.

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