January weather forecast
Trentwood, WA

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Weather in January

January, the same as December, is another cold winter month in Trentwood, Washington, with an average temperature varying between 33.3°F (0.7°C) and 22.6°F (-5.2°C).

Temperature

Shifting into January, Trentwood records an average high-temperature of a still cold 33.3°F (0.7°C), presenting minor fluctuations compared to the previous month. In Trentwood, an average nighttime temperature of 22.6°F (-5.2°C) is expected during January.

Humidity

With an average relative humidity of 91%, January is the most humid month in Trentwood, Washington.

Rainfall

The month with the most rainfall is January, when the rain falls for 9.7 days and typically aggregates up to 2.28" (58mm) of precipitation.

Snowfall

Months with snowfall in Trentwood are January through May, September through December. The month with the most snowfall is January, when snow falls for 13.3 days and typically aggregates up to 10.51" (267mm) of snow.

Daylight

In January, the average length of the day is 8h and 57min.
On the first day of January, sunrise is at 7:37 am and sunset at 4:07 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:47 pm PST.

Sunshine

The months with the least sunshine in Trentwood are January and December, with an average of 3.8h of sunshine.

UV index

The average daily maximum UV index in January in Trentwood is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: In January, the average maximum UV index of 2 translates into the following recommendations:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Boost your sun resistance with garments that are densely woven yet spacious. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
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Frequently asked questions

How cold is it in Trentwood in January?

In Trentwood, 33.3°F (0.7°C) is the average high-temperature and 22.6°F (-5.2°C) is the average low-temperature during January.

What is the most humid month in Trentwood?

January is the most humid month in Trentwood, with an average relative humidity of 91%.

What is the average humidity in January in Trentwood?

In Trentwood, Washington, the average relative humidity in January is 91%.

What is the rainiest month in Trentwood?

January is the month with the most rainfall in Trentwood. Rain falls for 9.7 days and accumulates 2.28" (58mm) of precipitation.

How much does it rain in Trentwood in January?

In January, in Trentwood, the rain falls for 9.7 days. Throughout January, 2.28" (58mm) of precipitation is accumulated.

What is the snowiest month in Trentwood?

January is the month with the most snowfall in Trentwood. Snow falls for 13.3 days and accumulates 10.51" (267mm) of snow.

How many days does it snow in January in Trentwood?

In Trentwood, in January, snow falls for 13.3 days, with typically accumulated 10.51" (267mm) of snow.

What is the average length of the day in January in Trentwood?

The average day length in January in Trentwood, Washington, is 8h and 57min.

What time are sunrise and sunset in January in Trentwood?

On the first day of January in Trentwood, sunrise is at 7:37 am and sunset at 4:07 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:47 pm PST.

What are the months with the least sunshine in Trentwood?

January and December, with an average of 3.8h of sunshine, are months with the least sunshine in Trentwood, Washington.

How long on average sun shines in January in Trentwood?

In January, the average sunshine duration in Trentwood is 3.8h.

What is the UV index reading in January in Trentwood?

The average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
32°F 0°C
33.3°F 0.7°C
36.5°F 2.5°C
Average low temperature
21.9°F -5.6°C
22.6°F -5.2°C
24.1°F -4.4°C
Average pressure
30.17" 766mmHg
30.19" 767mmHg
30.11" 765mmHg
Average wind speed
4.7mph 7.6km/h
4.8mph 7.7km/h
5.1mph 8.2km/h
Average max. wind speed
5mph 8km/h
5.2mph 8.4km/h
5.6mph 9km/h
Average wind speed gusts
8mph 12.9km/h
8.1mph 13km/h
8.5mph 13.7km/h
Average humidity
88%
91%
86%
Average rainfall
2.2" 56mm
2.28" 58mm
1.61" 41mm
Average rainfall days
8.9
9.7
8.8
Average snowfall
8.9" 226mm
10.51" 267mm
8.23" 209mm
Average snowfall days
13.9
13.3
11.2
Average daylight
8h 3min
8h 5min
10h 2min
Average sunshine
3h 5min
3h 5min
4h 1min
Average sunshine days
13.4
13.2
11.7
Average UV index
1
2
2
Average cloud cover
61%
62%
58%
Average visibility
4mi 6.4km
4mi 6.4km
4mi 6.4km

Average temperature in January
Trentwood, WA

Average temperature in January - Trentwood, WA
  • Average high temperature in January: 33.3°F

The warmest month (with the highest average high temperature) is August (83.3°F).
The month with the lowest average high temperature is December (32°F).

  • Average low temperature in January: 22.6°F

The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is December (21.9°F).

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Average pressure in January
Trentwood, WA

Average pressure in January - Trentwood, WA
  • Average pressure in January: 30.19"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 January
Trentwood, WA

Average wind speed in January - Trentwood, WA
  • Average wind speed in January: 4.8mph

The windiest month (with the highest average wind speed) is April (6.1mph).
The calmest month (with the lowest average wind speed) is December (4.7mph).

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Average humidity in January
Trentwood, WA

Average humidity in January - Trentwood, WA
  • Average humidity in January: 91%

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (43%).

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Average rainfall in January
Trentwood, WA

Average rainfall in January - Trentwood, WA
  • Average rainfall in January: 2.28"

The wettest month (with the highest rainfall) is January (2.28").
The driest months (with the least rainfall) are July and August (0.35").

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Average rainfall days in January
Trentwood, WA

Average rainfall days in January - Trentwood, WA
  • Average rainfall days in January: 9.7 days

The month with the highest number of rainy days is March (16 days).
The month with the least rainy days is July (5.1 days).

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Average snowfall in January
Trentwood, WA

Average snowfall in January - Trentwood, WA
  • Average snowfall in January: 10.51"

The month with the highest snowfall is January (10.51").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in January
Trentwood, WA

Average snowfall days in January - Trentwood, WA
  • Average snowfall days in January: 13.3 days

The month with the highest number of snowfall days is December (13.9 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in January / Average sunshine in January - Trentwood, WA
  • Average daylight in January: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in January: 3h and 5min

The month with the most sunshine is August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 3h and 48min).

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Average sunshine days in January
Trentwood, WA

Average sunshine days in January - Trentwood, WA
  • Average sunshine days in January: 13.2 days

The month with the most sunshine days is July (24.3 days).
The month with the least sunshine days is March (10.3 days).

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Average UV index in January
Trentwood, WA

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

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in January
Trentwood, WA

Average cloud cover in January - Trentwood, WA
  • Average cloud cover in January: 62

The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 13).

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Average visibility in January
Trentwood, WA

Average visibility in January - Trentwood, WA
  • Average visibility in January: 4mi

The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).

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Trentwood, Washington, USA

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