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 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
January's onset brings an average high-temperature of a still enjoyable 63.1°F (17.3°C), showing a minute difference from December's 60.8°F (16°C). An average low-temperature of 45.3°F (7.4°C) is anticipated throughout the nights during January.Humidity
In January, the average relative humidity is 48%.Rainfall
In Sierra Heights, in January, during 5.6 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. Throughout the year, there are 48.1 rainfall days, and 6.89" (175mm) of precipitation is accumulated.Snowfall
January, March through December are months without snowfall.Daylight
In January, the average length of the day is 10h and 11min.On the first day of the month, sunrise is at 6:55 am and sunset at 4:50 pm. On the last day of January, sunrise is at 6:47 am and sunset at 5:18 pm PST.
Sunshine
In Sierra Heights, the average sunshine in January is 7h.UV index
In Sierra Heights, the average daily maximum UV index in January is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: In January, the maximum UV index of 4 transforms into these recommendations:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are January temperatures?
What is the average humidity in January?
How much does it rain in January?
When it does not snow?
Does it snow in January?
What is the average length of the day in January?
When are sunrise and sunset in January?
How long on average sun shines in January?
How high is the UV index in January?
Average temperature in January
Sierra Heights, CA
- Average high temperature in January: 63.1°F
The warmest month (with the highest average high temperature) is August (92.1°F).
The month with the lowest average high temperature is December (60.8°F).
- Average low temperature in January: 45.3°F
The month with the highest average low temperature is August (67.3°F).
The coldest months (with the lowest average low temperature) are February and December (44.2°F).
Average pressure in January
Sierra Heights, CA
- Average pressure in January: 30.1"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in January
Sierra Heights, CA
- Average wind speed in January: 5.5mph
The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).
Average humidity in January
Sierra Heights, CA
- Average humidity in January: 48%
The months with the highest relative humidity are February, March and May (52%).
The month with the lowest relative humidity is August (39%).
Average rainfall in January
Sierra Heights, CA
- Average rainfall in January: 1.02"
The wettest month (with the highest rainfall) is February (1.57").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in January
Sierra Heights, CA
- Average rainfall days in January: 5.6 days
The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.2 days).
Average snowfall days in January
Sierra Heights, CA
- Average snowfall days in January: 0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in January /
Average sunshine in January
Sierra Heights, CA
- Average daylight in January: 10h and 1min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in January: 7h and 0min
The months with the most sunshine are June, July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in January
Sierra Heights, CA
- Average sunshine days in January: 24 days
The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (21.1 days).
Average UV index in January
Sierra Heights, CA
- Average UV index in January: 4
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in January
Sierra Heights, CA
- Average cloud cover in January: 19
The months with the most cloud cover are February, March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility in January
Sierra Heights, CA
- 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).
Sierra Heights, California, USA
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