Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
Altadena observes a minor difference in average high-temperatures between March's 66°F (18.9°C) and April's 70°F (21.1°C). In Altadena, an average nighttime temperature of 49.8°F (9.9°C) is expected during April.Humidity
The average relative humidity in April is 54%.Rainfall
In April, in Altadena, the rain falls for 5.8 days. Throughout April, 0.63" (16mm) of precipitation is accumulated. In Altadena, during the entire year, the rain falls for 52 days and collects up to 8.82" (224mm) of precipitation.Daylight
In April, the average length of the day is 13h and 4min.On the first day of the month, sunrise is at 6:38 am and sunset at 7:13 pm. On the last day of April, sunrise is at 6:03 am and sunset at 7:36 pm PDT.
Sunshine
In Altadena, the average sunshine in April is 11.4h.UV index
In April, the average daily maximum UV index in Altadena, California, is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 5 in April converts into the following recommendations:
Put precautions into practice - Guidance to elude sunburn is provided. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Frequently asked questions
What is the average April temperature in Altadena?
What is the average humidity in April in Altadena?
How much does it rain in Altadena in April?
How many hours of daylight does Altadena have in April?
When are sunrise and sunset in April in Altadena?
How many hours of sunshine does Altadena have in April?
What is the UV index reading in April in Altadena?
Average temperature in April
Altadena, CA
- Average high temperature in April: 70°F
The warmest month (with the highest average high temperature) is August (86.2°F).
The month with the lowest average high temperature is December (61°F).
- Average low temperature in April: 49.8°F
The month with the highest average low temperature is August (64.4°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).
Average pressure in April
Altadena, CA
- Average pressure in April: 29.96"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in April
Altadena, CA
- Average wind speed in April: 5.8mph
The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in April
Altadena, CA
- Average humidity in April: 54%
The months with the highest relative humidity are March, May and June (56%).
The month with the lowest relative humidity is November (46%).
Average rainfall in April
Altadena, CA
- Average rainfall in April: 0.63"
The wettest month (with the highest rainfall) is February (1.81").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in April
Altadena, CA
- Average rainfall days in April: 5.8 days
The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.3 days).
Average daylight in April /
Average sunshine in April
Altadena, CA
- Average daylight in April: 13h 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 April: 11h and 2min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 54min).
Average sunshine days in April
Altadena, CA
- Average sunshine days in April: 23.1 days
The month with the most sunshine days is June (27.2 days).
The month with the least sunshine days is February (21.3 days).
Average UV index in April
Altadena, CA
- Average UV index in April: 5
The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in April
Altadena, CA
- Average cloud cover in April: 16
The month with the most cloud cover is March (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in April
Altadena, CA
- Average visibility in April: 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).
Altadena, California, USA
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