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
January
Weather in January
Temperature
Welcoming January, O'Brien notes an average high-temperature of a fresh 50.4°F (10.2°C), nearly consistent with December's 47.8°F (8.8°C). Throughout January nights, O'Brien experiences a consistent temperature average of 35.2°F (1.8°C).Humidity
The average relative humidity in January is 75%.Rainfall
In O'Brien, during January, the rain falls for 11.9 days and regularly aggregates up to 4.13" (105mm) of precipitation. In O'Brien, California, during the entire year, the rain falls for 102.3 days and collects up to 24.21" (615mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In O'Brien, during January, snow falls for 0.4 days and regularly aggregates up to 0.31" (8mm) of snow. Throughout the year, in O'Brien, there are 4.6 snowfall days, and 4.45" (113mm) of snow is accumulated.Daylight
In O'Brien, the average length of the day in January is 9h and 39min.On the first day of January, sunrise is at 7:33 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 5:25 pm PST.
Sunshine
In O'Brien, the average sunshine in January is 5.5h.UV index
In January, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In January, an average UV index of 3 transforms into the following instructions:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Stay sun-safe with clothing that is both closely woven and worn loosely. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in January?
What is the average humidity in January?
How many days does it rain in January?
How many days does it snow in January?
What is the average length of the day in January?
What time are sunrise and sunset in January?
How long on average sun shines in January?
What is the UV index intensity in January?
Average temperature in January
O'Brien, CA
- Average high temperature in January: 50.4°F
The warmest month (with the highest average high temperature) is July (91.6°F).
The month with the lowest average high temperature is December (47.8°F).
- Average low temperature in January: 35.2°F
The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is December (33.6°F).
Average pressure in January
O'Brien, CA
- 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 (29.92"Hg).
Average wind speed in January
O'Brien, CA
- Average wind speed in January: 4.7mph
The windiest months (with the highest average wind speed) are March and October (5.3mph).
The calmest months (with the lowest average wind speed) are August and November (4.5mph).
Average humidity in January
O'Brien, CA
- Average humidity in January: 75%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is August (37%).
Average rainfall in January
O'Brien, CA
- Average rainfall in January: 4.13"
The wettest month (with the highest rainfall) is March (4.8").
The driest month (with the least rainfall) is July (0.12").
Average rainfall days in January
O'Brien, CA
- Average rainfall days in January: 11.9 days
The month with the highest number of rainy days is March (16.8 days).
The month with the least rainy days is August (1.7 days).
Average snowfall in January
O'Brien, CA
- Average snowfall in January: 0.31"
The month with the highest snowfall is November (1.3").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in January
O'Brien, CA
- Average snowfall days in January: 0.4 days
The month with the highest number of snowfall days is February (1.9 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
O'Brien, CA
- Average daylight in January: 9h and 4min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January: 5h and 3min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in January
O'Brien, CA
- Average sunshine days in January: 17.1 days
The month with the most sunshine days is August (27.1 days).
The month with the least sunshine days is March (11.8 days).
Average UV index in January
O'Brien, CA
- Average UV index in January: 3
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are February, November and December (UV index 2).
Average cloud cover in January
O'Brien, CA
- Average cloud cover in January: 39
The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in January
O'Brien, CA
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is December (5mi).