Lewis and Clark County (Helena)
December
Weather in Lewis and Clark County, Montana for December 2026
Your guide to Lewis and Clark County weather in December - trends and predictions
With an average of 3 snowy days, Lewis and Clark County usually enjoys a light touch of snow in December.
Precipitation in Lewis and Clark County during December is a rare event, with an average of fewer than 2 rainy days.
Is December a good time to visit Lewis and Clark County? check out the best time to travel to Lewis and Clark County page.
✨ Is December a good time to visit Lewis and Clark County? – Ask the AI Weatherman
Snow Forecast ❄️
Rain 🌧️
More
27
Dry days
1
Rainy days
3
Snow days
3°/-4°
Temperatures
15 km/h
Avg max wind
72 %
Avg humidity
Lewis and Clark County Weather December
Move between months or click on a day
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
| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 |  Cloudy | 1° /-8° | 0 mm | 0 cm | |
| Dec. 2 |  Sunny | 3° /-5° | 0 mm | 0 cm | |
| Dec. 3 |  Partly cloudy | 4° /-7° | 0 mm | 0 cm | |
| Dec. 4 | Sunny | 4° /-5° | 0 mm | 0 cm | |
| Dec. 5 |  Light snow | 4° /-6° | 2.3 mm | 1.7 cm | |
| Dec. 6 | Sunny | 5° /-4° | 0 mm | 0 cm | |
| Dec. 7 |  Overcast | 6° /-2° | 0.3 mm | 0 cm | |
| Dec. 8 |  Light freezing rain | 4° /-2° | 0.1 mm | 0 cm | |
| Dec. 9 | Partly cloudy | 2° /-4° | 0 mm | 0 cm | |
| Dec. 10 | Light snow | 5° /-3° | 4.2 mm | 2.3 cm | |
| Dec. 11 | Overcast | 6° /-1° | 0.1 mm | 0 cm | |
| Dec. 12 | Light snow | 2° /-4° | 1.6 mm | 1.2 cm | |
| Dec. 13 | Overcast | 4° /-5° | 0 mm | 0 cm | |
| Dec. 14 | Overcast | 7° /-2° | 0 mm | 0 cm | |
| Dec. 15 | Light snow | 4° /-4° | 3.6 mm | 2.2 cm | |
| Dec. 16 | Light freezing rain | 3° /-4° | 0.6 mm | 0 cm | |
| Dec. 17 |  Light rain | 2° /-5° | 2.6 mm | 0 cm | |
| Dec. 18 |  Patchy rain possible | 4° /-3° | 0.2 mm | 0 cm | |
| Dec. 19 | Partly cloudy | 2° /-6° | 0 mm | 0 cm | |
| Dec. 20 | Overcast | 3° /-5° | 0 mm | 0 cm | |
| Dec. 21 | Overcast | 3° /-5° | 0 mm | 0 cm | |
| Dec. 22 | Partly cloudy | 4° /-2° | 0.2 mm | 0 cm | |
| Dec. 23 | Overcast | 6° /-3° | 0 mm | 0 cm | |
| Dec. 24 | Overcast | 4° /-2° | 0 mm | 0 cm | |
| Dec. 25 | Light snow | 5° /-2° | 2.3 mm | 1 cm | |
| Dec. 26 | Light freezing rain | 4° /-2° | 0.3 mm | 0 cm | |
| Dec. 27 | Cloudy | 1° /-10° | 0 mm | 0 cm | |
| Dec. 28 | Light freezing rain | 0° /-9° | 0.2 mm | 0 cm | |
| Dec. 29 |  Patchy moderate snow | 2° /-6° | 1.4 mm | 0.3 cm | |
| Dec. 30 | Light freezing rain | 3° /-6° | 0.3 mm | 0 cm | |
| Dec. 31 | 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.
Change Month
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 3° 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?
In December, Lewis and Clark County can expect light to moderate rainfall, totaling 20.2 mm across approximately 1 days. Occasional showers are possible, and planning ahead for them could be helpful.
Will it snow in Lewis and Clark County in December 2026?
Lewis and Clark County experiences an average snowfall of 8.6 cm during December, occurring over 3 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 15 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 3 snowy days during December, with approximately 8.6 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 1 rainy days in December with a total of 20.2 mm of rainfall.
Top locations in Lewis and Clark County
Select a location for an accurate weather forecast
More Locations Quick links
More Lewis and Clark County weather pages
You are here
Found a mistake?
We appreciate your attention to details. Tell us here.