December weather forecast
Monroe, WA

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 also a wintry month, with temperature in the range of an average high of 41.2°F (5.1°C) and an average low of 31.8°F (-0.1°C).

Temperature

With an average high-temperature of 41.2°F (5.1°C) and an average low-temperature of 31.8°F (-0.1°C), December is the coldest month.

Humidity

Months with the highest humidity in Monroe are January, February and December, with an average relative humidity of 86%.

Rainfall

December is the month with the most rainfall in Monroe. Rain falls for 12.4 days and accumulates 1.85" (47mm) of precipitation.

Snowfall

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

Daylight

The month with the shortest days in Monroe, Washington, is December, with an average of 8.5h of daylight.

Sunshine

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

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 health risk from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 2 in December transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Monroe?

The coldest month in Monroe, Washington, is December, with an average high-temperature of 41.2°F (5.1°C) and an average low-temperature of 31.8°F (-0.1°C).

What is the most humid month in Monroe?

Months with the highest humidity in Monroe, Washington, are January, February and December, with an average relative humidity of 86%.

What is the average humidity in December in Monroe?

In Monroe, the average relative humidity in December is 86%.

What is the rainiest month in Monroe?

December is the month with the most rainfall in Monroe, Washington. Rain falls for 12.4 days and accumulates 1.85" (47mm) of precipitation.

How much does it rain in Monroe in December?

In Monroe, Washington, during December, the rain falls for 12.4 days and regularly aggregates up to 1.85" (47mm) of precipitation.

How many days does it snow in December in Monroe?

In Monroe, during December, snow falls for 1.1 days and regularly aggregates up to 0.2" (5mm) of snow.

What is the month with the shortest days in Monroe?

The month with the shortest days in Monroe is December, with an average of 8.5h of daylight.

What is the average length of the day in December in Monroe?

In December, the average length of the day is 8.5h.

What is the month with the least sunshine in Monroe?

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

How long on average sun shines in December in Monroe?

The average sunshine in December in Monroe is 3.8h.

What is the month with the lowest UV index in Monroe?

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

How high is the UV index in December in Monroe?

In Monroe, Washington, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to the Sun's UV rays.

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).

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Average pressure in December
Monroe, WA

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

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

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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).

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Average humidity in December
Monroe, WA

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

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

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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").

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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).

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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").
Months with the least snowfall are May, June, July, August, September and October (0").

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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).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Monroe, WA
  • Average daylight in December: 8.5h

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in December: 3.8h

The month with the most sunshine is August (Average sunshine: 10.6h).
The month with the least sunshine is December (Average sunshine: 3.8h).

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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).

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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).
Months with the lowest UV index are January, February, November and December (UV index 2).

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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).

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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).
Months with the lowest visibility are January, February, March, April, November and December (4mi).

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