December weather forecast
Pasco, WA

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The pink sunrise sky over the iconic Pasco Bridge across the glassy calm waters near Pasco, Washington
The pink sunrise sky over the iconic Pasco Bridge across the glassy calm waters near Pasco, Washington

Weather in December

December sees the return of winter, plummeting temperatures, and an increase in indoor activities. Cloud cover increases, further lowering temperatures, and bringing an unmistakable wintry chill. Snowfall enters the scene again at 0.91" (23mm), adding to the seasonal charm, rendering the city into a winter wonderland. As the year comes to a close, shorter days and longer nights become the norm, perfect for cozy indoor gatherings. Amidst its freezing temperatures, Pasco’s December can be summarized as a festive and lively month, leaving an indelible impression as the year concludes.

Temperature

December brings the lowest temperatures, with an average high of 37.8°F (3.2°C) and an average low of 27.7°F (-2.4°C).

Humidity

In December, the average relative humidity is 78%.

Rainfall

In December, in Pasco, the rain falls for 10.8 days. Throughout December, 0.91" (23mm) of precipitation is accumulated. Throughout the year, there are 101.7 rainfall days, and 7.36" (187mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Pasco are January through March, November and December. In December, in Pasco, it is snowing for 3.2 days. Throughout December, 0.91" (23mm) of snow is accumulated. Throughout the year, there are 11 snowfall days, and 4.53" (115mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 8h and 42min of daylight.
On the first day of December in Pasco, Washington, sunrise is at 7:19 am and sunset at 4:11 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 4:20 pm PST.

Sunshine

In December, the average sunshine is 5.5h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: A maximum high UV index of 2 in December translates into the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
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Frequently asked questions

What month is the coldest in Pasco?

Pasco's December weather, marked by an average high temperature of 37.8°F (3.2°C) and an average low temperature of 27.7°F (-2.4°C), is the coldest in the year.

How cold is it in Pasco in December?

December temperatures in Pasco vary between a high-temperature of 37.8°F (3.2°C) and a low-temperature of 27.7°F (-2.4°C).

What is the average humidity in December in Pasco?

In Pasco, Washington, the average relative humidity in December is 78%.

How much does it rain in Pasco in December?

In Pasco, during December, the rain falls for 10.8 days and regularly aggregates up to 0.91" (23mm) of precipitation.

How much does it snow in Pasco in December?

In Pasco, in December, during 3.2 snowfall days, 0.91" (23mm) of snow is typically accumulated.

What is the month with the shortest days in Pasco?

December has the shortest days of the year, with an average of 8h and 42min of daylight.

How many hours of daylight does Pasco have in December?

The average day length in December in Pasco, Washington, is 8h and 41min.

When are sunrise and sunset in December in Pasco?

On the first day of December in Pasco, Washington, sunrise is at 7:19 am and sunset at 4:11 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 4:20 pm PST.

How long on average sun shines in December in Pasco?

In December, the average sunshine duration in Pasco is 5.5h.

When is the lowest UV index in Pasco?

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

How high is the UV index in December in Pasco?

The average daily maximum UV index in December in Pasco is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe 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
Pasco, WA

Average temperature in December - Pasco, WA
  • Average high temperature in December: 37.8°F

The warmest month (with the highest average high temperature) is July (90°F).
The month with the lowest average high temperature is December (37.8°F).

  • Average low temperature in December: 27.7°F

The month with the highest average low temperature is August (64°F).
The coldest month (with the lowest average low temperature) is December (27.7°F).

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Average pressure in December
Pasco, WA

Average pressure in December - Pasco, WA
  • Average pressure in December: 30.16"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).

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Average wind speed in December
Pasco, WA

Average wind speed in December - Pasco, WA
  • Average wind speed in December: 5.8mph

The windiest month (with the highest average wind speed) is April (8.4mph).
The calmest month (with the lowest average wind speed) is December (5.8mph).

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Average humidity in December
Pasco, WA

Average humidity in December - Pasco, WA
  • Average humidity in December: 78%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is July (35%).

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Average rainfall in December
Pasco, WA

Average rainfall in December - Pasco, WA
  • Average rainfall in December: 0.91"

The wettest month (with the highest rainfall) is January (0.94").
The driest month (with the least rainfall) is July (0.2").

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Average rainfall days in December
Pasco, WA

Average rainfall days in December - Pasco, WA
  • Average rainfall days in December: 10.8 days

The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (3.5 days).

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Average snowfall in December
Pasco, WA

Average snowfall in December - Pasco, WA
  • Average snowfall in December: 0.91"

The month with the highest snowfall is February (2.09").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Pasco, WA

Average snowfall days in December - Pasco, WA
  • Average snowfall days in December: 3.2 days

The month with the highest number of snowfall days is February (3.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Pasco, WA
  • Average daylight in December: 8h and 4min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in December: 5h and 3min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).

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Average sunshine days in December
Pasco, WA

Average sunshine days in December - Pasco, WA
  • Average sunshine days in December: 17.2 days

The month with the most sunshine days is July (25.3 days).
The month with the least sunshine days is February (14.7 days).

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Average UV index in December
Pasco, WA

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

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

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Average cloud cover in December
Pasco, WA

Average cloud cover in December - Pasco, WA
  • Average cloud cover in December: 43

The month with the most cloud cover is January (Cloud cover 44).
The months with the least cloud cover are July and August (Cloud cover 10).

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Average visibility in December
Pasco, WA

Average visibility in December - Pasco, WA
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Pasco, Washington, USA

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