Castle Rock Weather in December

December in Castle Rock sees daytime temperatures around 7°C (45°F) and lows of 1°C (34°F) at night. Being part of the rainy season, heavy rainfall is a regular part of the day, so pack accordingly.

Rainfall in Castle Rock in December

As part of the rainy season, Castle Rock sees around 23 days of rain in December, with an average of 206 mm (8.1 in). Rainy season showers tend to be fairly substantial. A good rain jacket or umbrella is worth having with you most days.

Temperature in Castle Rock in December

Expect highs of 7°C (45°F) in Castle Rock in December, with nights dropping to around 1°C (34°F). Experience the winter season in December. Expect a cold feel throughout the day, not just in the mornings and evenings. Warm layers are essential. With overnight lows of 1°C (34°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets. Expect the coldest temperatures of the year this month. Make sure you have enough winter clothing to stay warm.

Sunshine in Castle Rock in December

The month has fewer sunny days, with around 62 hours of sunshine.

December in Castle Rock can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Castle Rock's climate page.

Castle Rock Temperature in December

Min Temperature 1°C (34°F)  

Max Temperature 7°C (45°F)  

Chance of Rain 75%  

Precipitation 206 mm (8.1 in)  

Rainy days 23 days  

Sunshine 62 hours *  

Percentage Sunshine *  

* Data from: Astoria, the United States of America (71 KM, 44 Miles).

What to Wear in Castle Rock in December

We recommend to layer up for chilly conditions in Castle Rock in December. You could start with thermal underwear or a good base layer to keep your core warm on the cooler days this month. Maybe also add a sweater or fleece, and top it off with a windproof jacket. Also bring a poncho, it will rain a lot! Waterproof everything you can. Sunglasses aren't essential this month, though you might want them for the occasional bright moment.

What To Do in Castle Rock in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

4/10

Cycling

4/10

Walking

4/10

Camping

3/10

Outdoor sports

4/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Castle Rock's climate page.

More climate data for Castle Rock

Temperature Rainfall Sunshine

See the full Castle Rock climate overview or explore weather in the United States of America.