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
January's average high-temperature is a still moderate 56.3°F (13.5°C), maintaining a close comparison with December's 55.6°F (13.1°C). The nights of January cool down to an average low of 47.5°F (8.6°C), subtly lower than daytime highs.Humidity
The average relative humidity in January in Millbrae, California, is 73%.Rainfall
In Millbrae, in January, during 10.4 rainfall days, 2.05" (52mm) of precipitation is typically accumulated. In Millbrae, during the entire year, the rain falls for 81.5 days and collects up to 12.8" (325mm) of precipitation.Daylight
In January, the average length of the day is 9h and 55min.On the first day of the month, sunrise is at 7:24 am and sunset at 5:01 pm. On the last day of January, sunrise is at 7:13 am and sunset at 5:31 pm PST.
Sunshine
The average sunshine in January is 6.1h.UV index
In January, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In January, a daily UV index of 4 turns into the following recommendations:
Be vigilant - Preventing sunburn is recommended. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Frequently asked questions
What is the usual temperature for Millbrae in January?
What is the average humidity in January in Millbrae?
How much does it rain in Millbrae in January?
What is the average length of the day in January in Millbrae?
When are sunrise and sunset in January in Millbrae?
How many hours of sunshine does Millbrae have in January?
What is the UV index reading in January in Millbrae?
Average temperature in January
Millbrae, CA
- Average high temperature in January: 56.3°F
The warmest month (with the highest average high temperature) is September (70.2°F).
The month with the lowest average high temperature is December (55.6°F).
- Average low temperature in January: 47.5°F
The month with the highest average low temperature is September (56.8°F).
The coldest month (with the lowest average low temperature) is January (47.5°F).
Average pressure in January
Millbrae, 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
Millbrae, CA
- Average wind speed in January: 6.5mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is September (6.1mph).
Average humidity in January
Millbrae, CA
- Average humidity in January: 73%
The month with the highest relative humidity is August (78%).
The month with the lowest relative humidity is October (70%).
Average rainfall in January
Millbrae, CA
- Average rainfall in January: 2.05"
The wettest month (with the highest rainfall) is February (2.44").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in January
Millbrae, CA
- Average rainfall days in January: 10.4 days
The month with the highest number of rainy days is March (12.8 days).
The months with the least rainy days are June and July (2.4 days).
Average daylight in January /
Average sunshine in January
Millbrae, 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: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in January
Millbrae, CA
- Average sunshine days in January: 19.9 days
The month with the most sunshine days is July (24.6 days).
The month with the least sunshine days is March (16.3 days).
Average UV index in January
Millbrae, 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 February and December (UV index 3).
Average cloud cover in January
Millbrae, CA
- Average cloud cover in January: 33
The month with the most cloud cover is March (Cloud cover 36).
The months with the least cloud cover are July and September (Cloud cover 15).
Average visibility in January
Millbrae, 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).
Millbrae, California, USA
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