Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
April's transformation into May witnesses an average high-temperature of a still agreeable 73.2°F (22.9°C), noting a minor change from the preceding month. Altadena cools down to an average low-temperature of 53.2°F (11.8°C) throughout the month of May.Humidity
The months with the highest humidity in Altadena are March, May and June, with an average relative humidity of 56%.Rainfall
In Altadena, in May, it is raining for 3.5 days, with typically 0.28" (7mm) of accumulated precipitation. In Altadena, during the entire year, the rain falls for 52 days and collects up to 8.82" (224mm) of precipitation.Daylight
In Altadena, the average length of the day in May is 13h and 58min.On the first day of the month, sunrise is at 6:02 am and sunset at 7:37 pm. On the last day of May, in Altadena, sunrise is at 5:41 am and sunset at 7:58 pm PDT.
Sunshine
The average sunshine in May is 11.7h.UV index
In May, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In May, the UV index of 5 transforms into the following advice:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average May temperature?
What are the most humid months?
What is the average humidity in May?
How many days does it rain in May?
How many hours of daylight does Altadena have in May?
When is the sunrise / sunset in May?
How many hours of sunshine does Altadena have in May?
What is the UV index reading in May?
Average temperature in May
Altadena, CA
- Average high temperature in May: 73.2°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 May: 53.2°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 May
Altadena, CA
- Average pressure in May: 29.92"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 May
Altadena, CA
- Average wind speed in May: 5.7mph
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 May
Altadena, CA
- Average humidity in May: 56%
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 May
Altadena, CA
- Average rainfall in May: 0.28"
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 May
Altadena, CA
- Average rainfall days in May: 3.5 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 May /
Average sunshine in May
Altadena, CA
- Average daylight in May: 14h and 0min
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 May: 11h and 4min
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 May
Altadena, CA
- Average sunshine days in May: 25.4 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 May
Altadena, CA
- Average UV index in May: 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 May
Altadena, CA
- Average cloud cover in May: 12
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 May
Altadena, CA
- Average visibility in May: 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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