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
As Atherton transitions into January, the average high-temperature stands at a still moderate 56.8°F (13.8°C), offering little variation from the preceding month. Throughout the month of January, Atherton observes an average nighttime temperature of 46.4°F (8°C).Humidity
The average relative humidity in January in Atherton is 73%.Rainfall
In Atherton, during January, the rain falls for 10.1 days and regularly aggregates up to 1.93" (49mm) of precipitation. In Atherton, during the entire year, the rain falls for 73.4 days and collects up to 11.89" (302mm) of precipitation.Daylight
In Atherton, the average length of the day in January is 9h and 56min.On the first day of January, sunrise is at 7:23 am and sunset at 5:01 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 5:31 pm PST.
Sunshine
In Atherton, the average sunshine in January is 6.2h.UV index
In Atherton, the average daily maximum UV index in January is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily high UV index of 4 during January translates into the following recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Frequently asked questions
What is the average January temperature in Atherton?
What is the average humidity in January in Atherton?
How many days does it rain in January in Atherton?
What is the average length of the day in January in Atherton?
When are sunrise and sunset in January in Atherton?
How long on average sun shines in January in Atherton?
What is the UV index intensity in January in Atherton?
Average temperature in January
Atherton, CA
- Average high temperature in January: 56.8°F
The warmest months (with the highest average high temperature) are July and August (73°F).
The month with the lowest average high temperature is December (55.9°F).
- Average low temperature in January: 46.4°F
The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is February (46°F).
Average pressure in January
Atherton, CA
- Average pressure in January: 30.13"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).
Average wind speed in January
Atherton, CA
- Average wind speed in January: 5.8mph
The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest months (with the lowest average wind speed) are August, September and October (5.5mph).
Average humidity in January
Atherton, CA
- Average humidity in January: 73%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (68%).
Average rainfall in January
Atherton, CA
- Average rainfall in January: 1.93"
The wettest month (with the highest rainfall) is February (2.36").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in January
Atherton, CA
- Average rainfall days in January: 10.1 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (0.8 days).
Average daylight in January /
Average sunshine in January
Atherton, CA
- Average daylight in January: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January: 6h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in January
Atherton, CA
- Average sunshine days in January: 19.8 days
The month with the most sunshine days is August (27.6 days).
The month with the least sunshine days is March (17.5 days).
Average UV index in January
Atherton, CA
- Average UV index in January: 4
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are November and December (UV index 3).
Average cloud cover in January
Atherton, CA
- Average cloud cover in January: 32
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in January
Atherton, 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).
Atherton, California, USA
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