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
The commencement of May introduces an average high-temperature of a still agreeable 73.2°F (22.9°C), closely mirroring the preceding month. During May in Altadena, the average low-temperature is recorded at a cool 53.2°F (11.8°C).Humidity
The months with the highest humidity in Altadena, California, are March, May and June, with an average relative humidity of 56%.Rainfall
In May, in Altadena, the rain falls for 3.5 days. Throughout May, 0.28" (7mm) of precipitation is accumulated. In Altadena, California, during the entire year, the rain falls for 52 days and collects up to 8.82" (224mm) of precipitation.Daylight
In May, the average length of the day is 13h and 58min.On the first day of May, sunrise is at 6:02 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 5:41 am and sunset at 7:58 pm PDT.
Sunshine
The average sunshine in May is 11.7h.UV index
The average daily maximum UV index in May in Altadena is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: In May, an average UV index of 5 transforms into the following instructions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Frequently asked questions
What are the temperatures in Altadena in May?
What are the most humid months in Altadena?
What is the average humidity in May in Altadena?
How many days does it rain in May in Altadena?
What is the average length of the day in May in Altadena?
When is the sunrise / sunset in May in Altadena?
How many hours of sunshine does Altadena have in May?
How high is the UV index in May in Altadena?
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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