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 onset sees an average high-temperature of a still refreshing 56.5°F (13.6°C), exhibiting a slight fluctuation from the previous month. Port Costa encounters a steady low-temperature average of 43°F (6.1°C) throughout the month of January.Humidity
The average relative humidity in January is 73%.Rainfall
In Port Costa, California, in January, it is raining for 7.7 days, with typically 0.83" (21mm) of accumulated precipitation. In Port Costa, during the entire year, the rain falls for 56.9 days and collects up to 4.88" (124mm) of precipitation.Daylight
The average length of the day in January is 9h and 53min.On the first day of the month, sunrise is at 7:24 am and sunset at 4:59 pm. On the last day of January, sunrise is at 7:14 am and sunset at 5:30 pm PST.
Sunshine
In Port Costa, the average sunshine in January is 5.9h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: An average maximum UV index of 3 in January leads to these recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. Direct Sun exposure should be minimized especially during midday when radiation is most intense. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Frequently asked questions
What are the temperatures in Port Costa in January?
What is the average humidity in January in Port Costa?
How many days does it rain in January in Port Costa?
How many hours of daylight does Port Costa have in January?
What time are sunrise and sunset in January in Port Costa?
How many hours of sunshine does Port Costa have in January?
What is the month with the lowest UV index in Port Costa?
How high is the UV index in January in Port Costa?
Average temperature in January
Port Costa, CA
- Average high temperature in January: 56.5°F
The warmest months (with the highest average high temperature) are July and September (80.1°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in January: 43°F
The month with the highest average low temperature is August (56.5°F).
The coldest month (with the lowest average low temperature) is January (43°F).
Average pressure in January
Port Costa, CA
- Average pressure in January: 30.14"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in January
Port Costa, CA
- Average wind speed in January: 4.9mph
The windiest month (with the highest average wind speed) is May (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.6mph).
Average humidity in January
Port Costa, CA
- Average humidity in January: 73%
The month with the highest relative humidity is March (75%).
The months with the lowest relative humidity are September and October (60%).
Average rainfall in January
Port Costa, CA
- Average rainfall in January: 0.83"
The wettest month (with the highest rainfall) is February (1.14").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in January
Port Costa, CA
- Average rainfall days in January: 7.7 days
The month with the highest number of rainy days is March (10.2 days).
The month with the least rainy days is August (0.9 days).
Average daylight in January /
Average sunshine in January
Port Costa, CA
- Average daylight in January: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January: 5h and 5min
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 42min).
Average sunshine days in January
Port Costa, CA
- Average sunshine days in January: 21.8 days
The month with the most sunshine days is July (27.2 days).
The month with the least sunshine days is March (18.8 days).
Average UV index in January
Port Costa, CA
- Average UV index in January: 3
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in January
Port Costa, CA
- Average cloud cover in January: 35
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in January
Port Costa, 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).
Port Costa, California, USA
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