January weather forecast
Pomona, WA

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Weather in January

January, like December, in Pomona, Washington, is another cold winter month, with an average temperature fluctuating between 25.5°F (-3.6°C) and 36.1°F (2.3°C).

Temperature

Pomona records an average high-temperature of a still cold 36.1°F (2.3°C) in January, closely mirroring the climate of the previous month. Pomona records an average temperature drop to a subzero cold 25.5°F (-3.6°C) in January.

Humidity

With an average relative humidity of 83%, January is the most humid month.

Rainfall

In Pomona, in January, during 10.5 rainfall days, 0.83" (21mm) of precipitation is typically accumulated. Throughout the year, in Pomona, there are 87.6 rainfall days, and 5.94" (151mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, September, November and December. In Pomona, Washington, during January, snow falls for 4.4 days and regularly aggregates up to 1.89" (48mm) of snow. Throughout the year, there are 19.9 snowfall days, and 8.62" (219mm) of snow is accumulated.

Daylight

In January, the average length of the day is 9h and 4min.
On the first day of January, sunrise is at 7:46 am and sunset at 4:24 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 5:03 pm PST.

Sunshine

The month with the least sunshine is January, with an average of 5.5h of sunshine.

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 estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.
Note: In January, the maximum UV index of 2 transforms into these recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.

Frequently asked questions

How cold is it in January?

An average high-temperature, in January, in Pomona, is 36.1°F (2.3°C) and the average low-temperature is 25.5°F (-3.6°C).

What is the most humid month in Pomona?

With an average relative humidity of 83%, January is the most humid month.

What is the average humidity in January?

In Pomona, the average relative humidity in January is 83%.

How many days does it rain in January?

In Pomona, in January, during 10.5 rainfall days, 0.83" (21mm) of precipitation is typically accumulated.

How many days does it snow in January?

In Pomona, Washington, during January, snow falls for 4.4 days and regularly aggregates up to 1.89" (48mm) of snow.

What is the average length of the day in January?

In Pomona, the average day length in January is 9h and 4min.

What time are sunrise and sunset in January?

In January, on the first day of the month, sunrise is at 7:46 am and sunset at 4:24 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 5:03 pm PST.

What is the month with the least sunshine?

With an average of 5.5h of sunshine, January has the least sunshine of the year in Pomona, Washington.

How long on average sun shines in January?

The average sunshine duration in January is 5.5h.

What is the month with the lowest UV index?

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

What is the UV index intensity in January?

In January, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health 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 January
Pomona, WA

Average temperature in January - Pomona, WA
  • Average high temperature in January: 36.1°F

The warmest month (with the highest average high temperature) is August (85.1°F).
The month with the lowest average high temperature is December (36°F).

  • Average low temperature in January: 25.5°F

The month with the highest average low temperature is August (58.8°F).
The coldest month (with the lowest average low temperature) is December (23.9°F).

Average pressure in January
Pomona, WA

Average pressure in January - Pomona, WA
  • Average pressure in January: 30.16"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).

Average wind speed in January
Pomona, WA

Average wind speed in January - Pomona, WA
  • Average wind speed in January: 4.3mph

The windiest month (with the highest average wind speed) is June (7.4mph).
The calmest month (with the lowest average wind speed) is December (4.2mph).

Average humidity in January
Pomona, WA

Average humidity in January - Pomona, WA
  • Average humidity in January: 83%

The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (41%).

Average rainfall in January
Pomona, WA

Average rainfall in January - Pomona, WA
  • Average rainfall in January: 0.83"

The wettest month (with the highest rainfall) is December (0.87").
The driest month (with the least rainfall) is July (0.08").

Average rainfall days in January
Pomona, WA

Average rainfall days in January - Pomona, WA
  • Average rainfall days in January: 10.5 days

The month with the highest number of rainy days is March (10.8 days).
The month with the least rainy days is July (2.3 days).

Average snowfall in January
Pomona, WA

Average snowfall in January - Pomona, WA
  • Average snowfall in January: 1.89"

The month with the highest snowfall is December (3.07").
The months with the least snowfall are May, June, July, August and October (0").

Average snowfall days in January
Pomona, WA

Average snowfall days in January - Pomona, WA
  • Average snowfall days in January: 4.4 days

The month with the highest number of snowfall days is December (5.7 days).
The months with the least snowfall days are May, June, July, August and October (0 days).

Average daylight in January /
Average sunshine in January
Pomona, WA

Average daylight in January / Average sunshine in January - Pomona, WA
  • Average daylight in January: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).

  • Average sunshine in January: 5h and 3min

The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).

Average sunshine days in January
Pomona, WA

Average sunshine days in January - Pomona, WA
  • Average sunshine days in January: 16.7 days

The month with the most sunshine days is July (27.6 days).
The month with the least sunshine days is February (15.5 days).

Average UV index in January
Pomona, WA

Average UV index in January - Pomona, WA
  • Average UV index in January: 2

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in January
Pomona, WA

Average cloud cover in January - Pomona, WA
  • Average cloud cover in January: 40

The month with the most cloud cover is January (Cloud cover 40).
The months with the least cloud cover are July and August (Cloud cover 9).

Average visibility in January
Pomona, WA

Average visibility in January - Pomona, WA
  • Average visibility in January: 5mi

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

Pomona, Washington, USA

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