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
The shift to January signals an average high-temperature of a still enjoyable 64.6°F (18.1°C), subtly varied from December's 62.1°F (16.7°C). During the month of January, an average low-temperature of 46.8°F (8.2°C) is recorded.Humidity
In January, the average relative humidity in Upland is 49%.Rainfall
In Upland, California, in January, it is raining for 5.4 days, with typically 1.18" (30mm) of accumulated precipitation. Throughout the year, there are 49.6 rainfall days, and 7.8" (198mm) 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 January, sunrise is at 6:56 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 5:19 pm PST.
Sunshine
The average sunshine in January is 7h.UV index
In January, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 4 during January leads to these instructions:
Ensure safety - Imperative it is to shield skin and eyes from damage. When the Sun is at its strongest around midday, find shade and limit exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average January temperature?
What is the average humidity in January?
How much does it rain in January?
When it does not snow?
Does it snow in January?
How many hours of daylight does Upland have in January?
When is the sunrise / sunset in January?
How many hours of sunshine does Upland have in January?
How high is the UV index in January?
Average temperature in January
Upland, CA
- Average high temperature in January: 64.6°F
The warmest month (with the highest average high temperature) is August (91°F).
The month with the lowest average high temperature is December (62.1°F).
- Average low temperature in January: 46.8°F
The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).
Average pressure in January
Upland, 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 (29.86"Hg).
Average wind speed in January
Upland, CA
- Average wind speed in January: 5.3mph
The windiest months (with the highest average wind speed) are April and May (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in January
Upland, CA
- Average humidity in January: 49%
The months with the highest relative humidity are March and May (54%).
The month with the lowest relative humidity is August (42%).
Average rainfall in January
Upland, CA
- Average rainfall in January: 1.18"
The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in January
Upland, CA
- Average rainfall days in January: 5.4 days
The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (1.2 days).
Average snowfall days in January
Upland, 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
Upland, 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 month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 54min).
Average sunshine days in January
Upland, CA
- Average sunshine days in January: 24.6 days
The month with the most sunshine days is June (28.2 days).
The month with the least sunshine days is February (21.5 days).
Average UV index in January
Upland, 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
Upland, CA
- Average cloud cover in January: 19
The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in January
Upland, 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).
Upland, California, USA
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