Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
As Hillsboro transitions into January, the average high-temperature stands at a still chilly 45.3°F (7.4°C), offering little variation from the preceding month. Throughout the nights in January, Hillsboro experiences an average low-temperature of 34.7°F (1.5°C).Humidity
The months with the highest humidity are January, February, November and December, with an average relative humidity of 85%.Rainfall
The month with the most rainfall is January, when the rain falls for 18.8 days and typically aggregates up to 4.57" (116mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In Hillsboro, in January, during 1.6 snowfall days, 0.79" (20mm) of snow is typically accumulated. In Hillsboro, during the entire year, snow falls for 6.6 days and aggregates up to 4.53" (115mm) of snow.Daylight
In Hillsboro, the average length of the day in January is 9h and 11min.On the first day of the month, sunrise is at 7:52 am and sunset at 4:38 pm. On the last day of January, sunrise is at 7:34 am and sunset at 5:16 pm PST.
Sunshine
The average sunshine in January is 3.8h.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 value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 2 in January interprets into the following recommendations:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in January?
What are the most humid months?
What is the average humidity in January?
What is the rainiest month?
How many days does it rain in January?
How much does it snow in January?
What is the average length of the day in January?
What time are sunrise and sunset in January?
How many hours of sunshine does Hillsboro have in January?
When is the lowest UV index?
What is the UV index reading in January in Hillsboro?
Average temperature in January
Hillsboro, OR
- Average high temperature in January: 45.3°F
The warmest month (with the highest average high temperature) is August (81.5°F).
The month with the lowest average high temperature is December (43.9°F).
- Average low temperature in January: 34.7°F
The month with the highest average low temperature is August (55.4°F).
The coldest month (with the lowest average low temperature) is December (34°F).
Average pressure in January
Hillsboro, OR
- Average pressure in January: 30.11"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in January
Hillsboro, OR
- Average wind speed in January: 4.9mph
The windiest month (with the highest average wind speed) is March (5mph).
The calmest months (with the lowest average wind speed) are June, August and September (4.3mph).
Average humidity in January
Hillsboro, OR
- Average humidity in January: 85%
The months with the highest relative humidity are January, February, November and December (85%).
The month with the lowest relative humidity is August (64%).
Average rainfall in January
Hillsboro, OR
- Average rainfall in January: 4.57"
The wettest month (with the highest rainfall) is January (4.57").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in January
Hillsboro, OR
- Average rainfall days in January: 18.8 days
The month with the highest number of rainy days is March (20.8 days).
The month with the least rainy days is August (4.4 days).
Average snowfall in January
Hillsboro, OR
- Average snowfall in January: 0.79"
The month with the highest snowfall is February (1.81").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in January
Hillsboro, OR
- Average snowfall days in January: 1.6 days
The month with the highest number of snowfall days is February (2.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Hillsboro, OR
- Average daylight in January: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in January: 3h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days in January
Hillsboro, OR
- Average sunshine days in January: 10.8 days
The month with the most sunshine days is July (24.4 days).
The month with the least sunshine days is March (8.5 days).
Average UV index in January
Hillsboro, OR
- 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
Hillsboro, OR
- Average cloud cover in January: 61
The month with the most cloud cover is February (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in January
Hillsboro, OR
- Average visibility in January: 4mi
The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January and February (4mi).
Hillsboro, Oregon, USA
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