January weather forecast
Olalla, WA

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Weather in January

January, the same as December, in Olalla, Washington, is a frosty winter month, with an average temperature fluctuating between 36.1°F (2.3°C) and 45°F (7.2°C).

Temperature

The transition into January shows a subtle variation to a still chilly 45°F (7.2°C) from December's 43.2°F (6.2°C) in the average high-temperature. Recording a slight decline in temperature during the nights, Olalla's January temperatures average at an icy 36.1°F (2.3°C).

Humidity

In January, the average relative humidity in Olalla is 86%.

Rainfall

The wettest months are January and December, with an average 2.05" (52mm) of rainfall.

Snowfall

January through March, November and December are months with snowfall in Olalla. In Olalla, in January, during 1.7 snowfall days, 0.63" (16mm) of snow is typically accumulated. Throughout the year, there are 7 snowfall days, and 2.36" (60mm) of snow is accumulated.

Ocean temperature

In January, the average ocean temperature in Olalla is 46°F (7.8°C).
Note: Swimming in 46°F (7.8°C) at temperatures under 50°F (10°C) requires thermal swimsuits; otherwise, one can face cold shock and breathing difficulty. Even brief immersion at 55.4°F (13°C) feels frosty.

Daylight

In January, the average length of the day in Olalla is 8h and 59min.
On the first day of the month, sunrise is at 7:57 am and sunset at 4:29 pm. On the last day of January, sunrise is at 7:37 am and sunset at 5:09 pm PST.

Sunshine

In Olalla, Washington, the average sunshine in January is 4.2h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Olalla. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: In January, the UV index of 2 transforms into the following advice:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
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Frequently asked questions

What is the average January temperature in Olalla?

January temperatures vary between a high-temperature of 45°F (7.2°C) and a low-temperature of 36.1°F (2.3°C).

What is the average humidity in January in Olalla?

In January, the average relative humidity in Olalla is 86%.

What is the wettest month in Olalla?

The wettest months in Olalla are January and December, with an average 2.05" (52mm) of rainfall.

How much does it rain in Olalla in January?

In Olalla, in January, it is raining for 13.4 days, with typically 2.05" (52mm) of accumulated precipitation.

How many days does it snow in January in Olalla?

In Olalla, during January, snow falls for 1.7 days and regularly aggregates up to 0.63" (16mm) of snow.

What is the ocean temperature in January in Olalla?

In Olalla, in January, the average water temperature is 46°F (7.8°C). Swimming in 46°F (7.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

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

In January, the average day length in Olalla, Washington, is 8h and 59min.

When is the sunrise / sunset in January in Olalla?

On the first day of January in Olalla, Washington, sunrise is at 7:57 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 5:09 pm PST.

How long on average sun shines in January in Olalla?

In January, the average sunshine duration in Olalla is 4.2h.

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

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

What is the UV index reading in January in Olalla?

The average daily maximum UV index in January in Olalla, Washington, is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
43.2°F 6.2°C
45°F 7.2°C
46°F 7.8°C
Average low temperature
34.9°F 1.6°C
36.1°F 2.3°C
35.2°F 1.8°C
Average pressure
30.07" 764mmHg
30.09" 764mmHg
30.06" 764mmHg
Average wind speed
4.7mph 7.6km/h
5.1mph 8.2km/h
5mph 8km/h
Average max. wind speed
5.2mph 8.4km/h
5.7mph 9.2km/h
5.6mph 9km/h
Average wind speed gusts
8mph 12.9km/h
8.6mph 13.8km/h
8.4mph 13.5km/h
Average humidity
87%
86%
85%
Average rainfall
2.05" 52mm
2.05" 52mm
1.14" 29mm
Average rainfall days
14.3
13.4
12.8
Average snowfall
0.12" 3mm
0.63" 16mm
1.22" 31mm
Average snowfall days
1
1.7
2.8
Average sea temperature
46.9°F 8.3°C
46°F 7.8°C
45.8°F 7.7°C
Average daylight
8h 3min
9h 0min
10h 2min
Average sunshine
4h 1min
4h 1min
4h 3min
Average sunshine days
13.8
14.9
11.8
Average UV index
2
2
2
Average cloud cover
58%
57%
55%
Average visibility
5mi 8km
5mi 8km
5mi 8km

Average temperature in January
Olalla, WA

Average temperature in January - Olalla, WA
  • Average high temperature in January: 45°F

The warmest month (with the highest average high temperature) is August (77.2°F).
The month with the lowest average high temperature is December (43.2°F).

  • Average low temperature in January: 36.1°F

The month with the highest average low temperature is August (53.6°F).
The coldest month (with the lowest average low temperature) is December (34.9°F).

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Average pressure in January
Olalla, WA

Average pressure in January - Olalla, WA
  • Average pressure in January: 30.09"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).

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Average wind speed in January
Olalla, WA

Average wind speed in January - Olalla, WA
  • Average wind speed in January: 5.1mph

The windiest month (with the highest average wind speed) is March (5.5mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).

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Average humidity in January
Olalla, WA

Average humidity in January - Olalla, WA
  • Average humidity in January: 86%

The month with the highest relative humidity is December (87%).
The month with the lowest relative humidity is July (69%).

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Average rainfall in January
Olalla, WA

Average rainfall in January - Olalla, WA
  • Average rainfall in January: 2.05"

The wettest months (with the highest rainfall) are January and December (2.05").
The driest month (with the least rainfall) is July (0.28").

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Average rainfall days in January
Olalla, WA

Average rainfall days in January - Olalla, WA
  • Average rainfall days in January: 13.4 days

The month with the highest number of rainy days is March (15.3 days).
The month with the least rainy days is August (5.4 days).

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Average snowfall in January
Olalla, WA

Average snowfall in January - Olalla, WA
  • Average snowfall in January: 0.63"

The month with the highest snowfall is February (1.22").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in January
Olalla, WA

Average snowfall days in January - Olalla, WA
  • Average snowfall days in January: 1.7 days

The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in January
Olalla, WA

Average sea temperature in January - Olalla, WA
  • Average sea temperature in January: 46°F

The best month for swimming (with the highest average sea temperature) is August (53.3°F).
The coldest month (with the lowest average sea temperature) is February (45.8°F).

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

Average daylight in January / Average sunshine in January - Olalla, WA
  • Average daylight in January: 9h and 0min

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: 4h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).

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Average sunshine days in January
Olalla, WA

Average sunshine days in January - Olalla, WA
  • Average sunshine days in January: 14.9 days

The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (11.8 days).

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Average UV index in January
Olalla, WA

Average UV index in January - Olalla, 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).

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Average cloud cover in January
Olalla, WA

Average cloud cover in January - Olalla, WA
  • Average cloud cover in January: 57

The month with the most cloud cover is December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 25).

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Average visibility in January
Olalla, WA

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

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

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Olalla, Washington, USA

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