December weather forecast and climate
Harrington, WA

Weather in December

December, the first month of the winter, in Harrington, is still a freezing cold month, with temperature in the range of an average high of 31.5°F (-0.3°C) and an average low of 21.9°F (-5.6°C).

Temperature

The coldest month is December, with an average high-temperature of 31.5°F (-0.3°C) and an average low-temperature of 21.9°F (-5.6°C).

Humidity

In Harrington, the average relative humidity is 86%.

Rainfall

In Harrington, during December, the rain falls for 9.1 days and regularly aggregates up to 1.89" (48mm) of precipitation. Throughout the year, in Harrington, there are 127.9 rainfall days, and 15.71" (399mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. In Harrington, in December, snow falls for 15.9 days, with typically accumulated 9.02" (229mm) of snow. Throughout the year, in Harrington, there are 65.1 snowfall days, and 37.36" (949mm) of snow is accumulated.

Daylight

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

Sunshine

December has the least sunshine of the year, with an average of 4.1h of sunshine.

UV index

Months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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 Harrington?

The coldest month is December, with an average high-temperature of 31.5°F (-0.3°C) and an average low-temperature of 21.9°F (-5.6°C).

What is the average humidity in December in Harrington?

The average relative humidity in December is 86%.

How much does it rain in Harrington in December?

In Harrington, Washington, during December, the rain falls for 9.1 days and regularly aggregates up to 1.89" (48mm) of precipitation.

How much does it snow in Harrington in December?

In December, in Harrington, it is snowing for 15.9 days. Throughout December, 9.02" (229mm) of snow is accumulated.

What is the month with the shortest days in Harrington?

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

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

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

What is the month with the least sunshine in Harrington?

December has the least sunshine of the year, with an average of 4.1h of sunshine.

How long on average sun shines in December in Harrington?

In December, the average sunshine in Harrington is 4.1h.

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

Months with the lowest UV index in Harrington, Washington, are January through March, October through December, with an average maximum UV index of 2.

What is the UV index reading in December in Harrington?

In Harrington, Washington, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to the Sun's UV rays.

Average temperature in December
Harrington, WA

Average temperature in December - Harrington, WA
  • Average high temperature in December: 31.5°F

The warmest months (with the highest average high temperature) are July and August (83.3°F).
The month with the lowest average high temperature is December (31.5°F).

  • Average low temperature in December: 21.9°F

The month with the highest average low temperature is August (60.3°F).
The coldest month (with the lowest average low temperature) is December (21.9°F).

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Average pressure in December
Harrington, WA

Average pressure in December - Harrington, WA
  • Average pressure in December: 30.16"

The month with the highest atmospheric pressure is January (30.19").
The month with the lowest atmospheric pressure is August (29.9").

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Average wind speed in December
Harrington, WA

Average wind speed in December - Harrington, WA
  • Average wind speed in December: 6.6mph

The windiest months (with the highest average wind speed) are March and April (8.1mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

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Average humidity in December
Harrington, WA

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

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (37%).

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Average rainfall in December
Harrington, WA

Average rainfall in December - Harrington, WA
  • Average rainfall in December: 1.89"

The wettest month (with the highest rainfall) is March (1.97").
The driest months (with the least rainfall) are July and August (0.31").

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Average rainfall days in December
Harrington, WA

Average rainfall days in December - Harrington, WA
  • Average rainfall days in December: 9.1 days

The month with the highest number of rainy days is March (16.3 days).
The month with the least rainy days is August (5.2 days).

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Average snowfall in December
Harrington, WA

Average snowfall in December - Harrington, WA
  • Average snowfall in December: 9.02"

The month with the highest snowfall is January (10").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in December
Harrington, WA

Average snowfall days in December - Harrington, WA
  • Average snowfall days in December: 15.9 days

The month with the highest number of snowfall days is December (15.9 days).
Months with the least snowfall days are June, July and August (0 days).

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

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

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in December: 4.1h

The month with the most sunshine is August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 4.1h).

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Average sunshine days in December
Harrington, WA

Average sunshine days in December - Harrington, WA
  • Average sunshine days in December: 12.8 days

The month with the most sunshine days is July (23.7 days).
The month with the least sunshine days is March (10.2 days).

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Average UV index in December
Harrington, WA

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

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are January, February, March, October, November and December (UV index 2).

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Average cloud cover in December
Harrington, WA

Average cloud cover in December - Harrington, WA
  • Average cloud cover in December: 56

The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is July (Cloud cover 12).

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Average visibility in December
Harrington, WA

Average visibility in December - Harrington, WA
  • Average visibility in December: 5mi

Months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).

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