Mercer Island weather in December (Washington State, United States of America)

Curious about the climate in Mercer Island this December? Check out this detailed guide to the month’s weather conditions.

Temperatures

The typical weather for December in Mercer Island includes low temperatures and high rainfall. Experience the winter season in December. Expect temperatures to climb to 8°C during the day, with nighttime readings dropping to 2°C. On average, it is the coldest month of the year. So be prepared and make sure to pack winter clothes.

Precipitation

Mercer Island in December usually receives high rainfall, averaging around 154 mm for the month. The climate data from previous years indicates that there are typically about 20 days days of rain.

Average sunshine

The month is characterized by fewer sunny days, with roughly 54 hours hours of sunshine. Ideal for those who prefer a cooler, cloudier climate.

If you're looking for dry conditions and comfortable temperatures, December may not be the ideal month to visit Mercer Island. June, July, August and September generally stand out with the best circumstances. While January, February, March, November and December tend to showcase less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized Mercer Island climate page with graphs.

 

Mercer Island, monthly averages in December

Min Temperature 2°C  

Max Temperature 8°C  

Chance of Rain 67%  

Precipitation 154 mm  

Rainy days 20 days  

Humidity 80% *  

Windspeed 14 km/h *  

Sunshine 54 hours *  

Percentage Sunshine 20% *  

Data from: Seattle, the United States of America (15 KM, 9 Miles).

Where to go in the United States of America in December

Find out more about the weather in the United States of America and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

Map not visible? Whoops sorry! Please refresh the page.

Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

Wear a base layer in cold weather; this is the #1 thing you can do to increase your overall body temperature.

What To Do

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

Interested in more climate information?

This site provides you with all the information you need about the climate in Mercer Island.

Our site offers climate and forecast data for every country in the world. Are you going to the United States of America? On this website you can find historical weather averages for many cities in the United States of America. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.