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 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
Transitioning into January, Alta Loma records an average high-temperature of a still comfortable 63.9°F (17.7°C), almost identical to December's 61.3°F (16.3°C). During January, the temperature tends to dip to an average of 46°F (7.8°C) at night.Humidity
In January, the average relative humidity is 49%.Rainfall
In January, the rain falls for 5.6 days. Throughout January, 1.02" (26mm) of precipitation is accumulated. Throughout the year, there are 50.5 rainfall days, and 7.56" (192mm) of precipitation is accumulated.Daylight
In January, the average length of the day is 10h and 11min.On the first day of the month, sunrise is at 6:56 am and sunset at 4:51 pm. On the last day of January, 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 estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: In January, the maximum UV index of 4 translates into these guidelines:
Heed the precautions - Suggestions to avoid sunburn are made. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
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 many days does it rain 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 Alta Loma have in January?
How high is the UV index in January?
Average temperature in January
Alta Loma, CA
- Average high temperature in January: 63.9°F
The warmest month (with the highest average high temperature) is August (91.2°F).
The month with the lowest average high temperature is December (61.3°F).
- Average low temperature in January: 46°F
The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is February (45.1°F).
Average pressure in January
Alta Loma, 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
Alta Loma, CA
- Average wind speed in January: 5.3mph
The windiest months (with the highest average wind speed) are April and May (5.9mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).
Average humidity in January
Alta Loma, CA
- Average humidity in January: 49%
The months with the highest relative humidity are February, March and May (53%).
The month with the lowest relative humidity is August (41%).
Average rainfall in January
Alta Loma, CA
- Average rainfall in January: 1.02"
The wettest month (with the highest rainfall) is February (1.73").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in January
Alta Loma, 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 daylight in January /
Average sunshine in January
Alta Loma, 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 month with the least sunshine is February (Average sunshine: 6h and 54min).
Average sunshine days in January
Alta Loma, CA
- Average sunshine days in January: 24.2 days
The month with the most sunshine days is June (27.7 days).
The month with the least sunshine days is February (21.4 days).
Average UV index in January
Alta Loma, 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
Alta Loma, CA
- Average cloud cover in January: 19
The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility in January
Alta Loma, 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).
Alta Loma, California, USA
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