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
Irwindale's weather, upon January's arrival, documents an average high-temperature of a still comfortable 64.9°F (18.3°C), nearly identical to the prior month. Throughout the month of January, Irwindale expects an average low of 48.4°F (9.1°C).Humidity
In Irwindale, the average relative humidity in January is 50%.Rainfall
In January, in Irwindale, the rain falls for 5.7 days. Throughout January, 1.42" (36mm) of precipitation is accumulated. In Irwindale, during the entire year, the rain falls for 49.6 days and collects up to 8.11" (206mm) of precipitation.Snowfall
January through November are months without snowfall in Irwindale, California.Daylight
In January, the average length of the day in Irwindale is 10h and 11min.On the first day of the month, sunrise is at 6:57 am and sunset at 4:53 pm. On the last day of January, in Irwindale, sunrise is at 6:49 am and sunset at 5:20 pm PST.
Sunshine
The months with the least sunshine in Irwindale are January, February and December, with an average of 6.9h of sunshine.UV index
January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Irwindale. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: In January, a regular UV index of 4 translates into these guidelines:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Irwindale in January?
What is the average humidity in January in Irwindale?
How many days does it rain in January in Irwindale?
When it does not snow in Irwindale?
Does it snow in Irwindale in January?
What is the average length of the day in January in Irwindale?
When is the sunrise / sunset in January in Irwindale?
What are the months with the least sunshine in Irwindale?
How many hours of sunshine does Irwindale have in January?
What is the month with the lowest UV index in Irwindale?
How high is the UV index in January in Irwindale?
Average temperature in January
Irwindale, CA
- Average high temperature in January: 64.9°F
The warmest month (with the highest average high temperature) is August (87.1°F).
The month with the lowest average high temperature is December (63.1°F).
- Average low temperature in January: 48.4°F
The month with the highest average low temperature is August (64.9°F).
The coldest months (with the lowest average low temperature) are February and December (47.3°F).
Average pressure in January
Irwindale, 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 (29.88"Hg).
Average wind speed in January
Irwindale, CA
- Average wind speed in January: 5.3mph
The windiest months (with the highest average wind speed) are April and May (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in January
Irwindale, CA
- Average humidity in January: 50%
The months with the highest relative humidity are May and June (57%).
The month with the lowest relative humidity is November (46%).
Average rainfall in January
Irwindale, CA
- Average rainfall in January: 1.42"
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
Irwindale, CA
- Average rainfall days in January: 5.7 days
The month with the highest number of rainy days is March (6.5 days).
The month with the least rainy days is June (1.2 days).
Average snowfall days in January
Irwindale, CA
- Average snowfall days in January: 0 days
The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in January /
Average sunshine in January
Irwindale, 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: 6h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 54min).
Average sunshine days in January
Irwindale, CA
- Average sunshine days in January: 24.8 days
The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (21.5 days).
Average UV index in January
Irwindale, CA
- Average UV index in January: 4
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in January
Irwindale, CA
- Average cloud cover in January: 20
The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in January
Irwindale, 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).
Irwindale, California, USA
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