December weather forecast
Monroe, WA

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The red Washington Water Powerhouse, next to a large bridge over the Spokane River and scenic waterfalls in Monroe, Washington
The red Washington Water Powerhouse, next to a large bridge over the Spokane River and scenic waterfalls in Monroe, Washington

Weather in December

December, the first month of the winter in Monroe, is still a cold month, with an average temperature fluctuating between 31.8°F (-0.1°C) and 41.2°F (5.1°C).

Temperature

The lowest temperatures are recorded in December, with averages reaching a high of 41.2°F (5.1°C) and a low of 31.8°F (-0.1°C).

Humidity

The months with the highest humidity are January, February and December, with an average relative humidity of 86%.

Rainfall

The month with the most rainfall is December, when the rain falls for 12.4 days and typically aggregates up to 1.85" (47mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Monroe, in December, during 1.1 snowfall days, 0.2" (5mm) of snow is typically accumulated. In Monroe, during the entire year, snow falls for 7 days and aggregates up to 2.64" (67mm) of snow.

Daylight

With an average of 8h and 30min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:36 am and sunset at 4:17 pm. On the last day of December, sunrise is at 7:56 am and sunset at 4:25 pm PST.

Sunshine

The month with the least sunshine is December, with an average of 3.8h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index of 2 in December converts into the following recommendations:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.

Frequently asked questions

What is the coldest time of year?

The lowest temperatures are recorded in December, with averages reaching a high of 41.2°F (5.1°C) and a low of 31.8°F (-0.1°C).

How cold does it get in December?

During December, Monroe experiences an average high-temperature of 41.2°F (5.1°C) and a low-temperature of 31.8°F (-0.1°C).

What are the most humid months in Monroe?

The months with the highest humidity are January, February and December, with an average relative humidity of 86%.

What is the average humidity in December?

The average relative humidity in December is 86%.

What is the wettest month in Monroe?

The month with the most rainfall is December, when the rain falls for 12.4 days and typically aggregates up to 1.85" (47mm) of precipitation.

How many days does it rain in December?

In December, the rain falls for 12.4 days. Throughout December, 1.85" (47mm) of precipitation is accumulated.

How many days does it snow in December?

In Monroe, in December, during 1.1 snowfall days, 0.2" (5mm) of snow is typically accumulated.

What is the month with the shortest days?

With an average of 8h and 30min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

In Monroe, the average day length in December is 8h and 28min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:36 am and sunset at 4:17 pm. On the last day of the month, sunrise is at 7:56 am and sunset at 4:25 pm PST.

What is the month with the least sunshine?

With an average of 3.8h of sunshine, December has the least sunshine of the year in Monroe.

How many hours of sunshine does Monroe have in December?

In December, the average sunshine duration is 3.8h.

What is the month with the lowest UV index?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the UV index reading in December?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Monroe, WA

Average temperature in December - Monroe, WA
  • Average high temperature in December: 41.2°F

The warmest month (with the highest average high temperature) is August (75.6°F).
The month with the lowest average high temperature is December (41.2°F).

  • Average low temperature in December: 31.8°F

The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is December (31.8°F).

Average pressure in December
Monroe, WA

Average pressure in December - Monroe, WA
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

Average wind speed in December
Monroe, WA

Average wind speed in December - Monroe, WA
  • Average wind speed in December: 4.5mph

The windiest month (with the highest average wind speed) is January (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.3mph).

Average humidity in December
Monroe, WA

Average humidity in December - Monroe, WA
  • Average humidity in December: 86%

The months with the highest relative humidity are January, February and December (86%).
The month with the lowest relative humidity is July (71%).

Average rainfall in December
Monroe, WA

Average rainfall in December - Monroe, WA
  • Average rainfall in December: 1.85"

The wettest month (with the highest rainfall) is December (1.85").
The driest month (with the least rainfall) is August (0.2").

Average rainfall days in December
Monroe, WA

Average rainfall days in December - Monroe, WA
  • Average rainfall days in December: 12.4 days

The month with the highest number of rainy days is March (13.6 days).
The month with the least rainy days is August (4 days).

Average snowfall in December
Monroe, WA

Average snowfall in December - Monroe, WA
  • Average snowfall in December: 0.2"

The month with the highest snowfall is February (1.02").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Monroe, WA

Average snowfall days in December - Monroe, WA
  • Average snowfall days in December: 1.1 days

The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Monroe, WA

Average daylight in December / Average sunshine in December - Monroe, WA
  • Average daylight in December: 8h and 3min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in December: 3h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 3h and 48min).

Average sunshine days in December
Monroe, WA

Average sunshine days in December - Monroe, WA
  • Average sunshine days in December: 17.1 days

The month with the most sunshine days is August (25.5 days).
The month with the least sunshine days is April (15 days).

Average UV index in December
Monroe, WA

Average UV index in December - Monroe, WA
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Monroe, WA

Average cloud cover in December - Monroe, WA
  • Average cloud cover in December: 60

The month with the most cloud cover is December (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 28).

Average visibility in December
Monroe, WA

Average visibility in December - Monroe, WA
  • Average visibility in December: 4mi

The month with the highest visibility is July (6mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).

Monroe, Washington, USA

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