January weather forecastHermiston, OR

January

Weather in January

The start of the year in Hermiston, Oregon, witnesses a generally cold and wet weather pattern. Despite the chill, January presents an interesting mix of winter conditions with the high relative humidity of 79%. One unique aspect of January is the presence of snowfall, amounting to 1.06" (27mm) over an average of 2.5 days. This month competes with February for the title of the chilliest period of the year, though February edges it out slightly in that regard. It introduces the winter period, setting the tone for the following month.

Temperature

January's arrival brings an average high-temperature of a still icy 39.9°F (4.4°C), demonstrating subtle variation from the preceding month. Hermiston's nights in January cool down to an average low-temperature of 29.7°F (-1.3°C).

Humidity

With an average relative humidity of 79%, January is the most humid month.

Rainfall

In Hermiston, in January, during 11.1 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. In Hermiston, during the entire year, the rain falls for 109.3 days and collects up to 8.11" (206mm) of precipitation.

Snowfall

January through March, September, November and December are months with snowfall. In January, it is snowing for 2.5 days. Throughout January, 1.06" (27mm) of snow is accumulated. Throughout the year, there are 12 snowfall days, and 6.06" (154mm) of snow is accumulated.

Daylight

In January, the average length of the day is 9h and 9min.
On the first day of January, sunrise is at 7:38 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 5:00 pm PST.

Sunshine

January and December, with an average of 5.5h of sunshine, are months with the least sunshine.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The UV index of 2 during January leads to these advisories:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.

Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

An average high-temperature, in January, in Hermiston, is 39.9°F (4.4°C) and the average low-temperature is 29.7°F (-1.3°C).

The most humid month is January, with an average relative humidity of 79%.

The average relative humidity in January is 79%.

In Hermiston, in January, during 11.1 rainfall days, 0.98" (25mm) of precipitation is typically accumulated.

In Hermiston, in January, snow falls for 2.5 days, with typically accumulated 1.06" (27mm) of snow.

In Hermiston, Oregon, the average day length in January is 9h and 9min.

In January, on the first day of the month, sunrise is at 7:38 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 5:00 pm PST.

The months with the least sunshine are January and December, with an average of 5.5h of sunshine.

In January, the average sunshine duration is 5.5h.

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

In Hermiston, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a low health threat from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

38.8°F

39.9°F

45°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

6.8mph

7.1mph

8mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

16.3

13.3

Average UV index

Average cloud cover

43%

42%

Average visibility

6mi

Average temperature in January
Hermiston, OR

Average high temperature in January: 39.9°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is December (38.8°F).

Average low temperature in January: 29.7°F

The month with the highest average low temperature is August (64°F).
The coldest month (with the lowest average low temperature) is December (28.6°F).

Average pressure in January
Hermiston, OR

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).

Average wind speed in January
Hermiston, OR

Average wind speed in January: 6.3mph

The windiest month (with the highest average wind speed) is April (9.2mph).
The calmest month (with the lowest average wind speed) is December (6.1mph).

Average humidity in January
Hermiston, OR

Average humidity in January: 79%

The month with the highest relative humidity is January (79%).
The months with the lowest relative humidity are July and August (36%).

Average rainfall in January
Hermiston, OR

Average rainfall in January: 0.98"

The wettest months (with the highest rainfall) are March and December (1.06").
The driest month (with the least rainfall) is July (0.16").

Average rainfall days in January
Hermiston, OR

Average rainfall days in January: 11.1 days

The month with the highest number of rainy days is March (14.5 days).
The month with the least rainy days is August (3.3 days).

Average snowfall in January
Hermiston, OR

Average snowfall in January: 1.06"

The month with the highest snowfall is February (2.72").
The months with the least snowfall are April, May, June, July, August and October (0").

Average snowfall days in January
Hermiston, OR

Average snowfall days in January: 2.5 days

The month with the highest number of snowfall days is December (3.7 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).

Average daylight in January /
Average sunshine in January
Hermiston, OR

Average daylight in January: 9h and 12min

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 January: 5h and 30min

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

Average sunshine days in January
Hermiston, OR

Average sunshine days in January: 16.3 days

The month with the most sunshine days is July (25.5 days).
The month with the least sunshine days is February (13.3 days).

Average UV index in January
Hermiston, OR

Average UV index in January: 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).

Average cloud cover in January
Hermiston, OR

Average cloud cover in January: 43

The months with the most cloud cover are January and December (Cloud cover 43).
The months with the least cloud cover are July and August (Cloud cover 9).

Average visibility in January
Hermiston, OR

Average visibility in January: 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).