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Climate
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United States of America

ALTADENA, CALIFORNIA


Home > North America > United States > California
Elevation: 347 meters     Latitude: 34 11N     Longitude: 118 08W

WEATHER
 
CURRENT CONDITIONS

Sunrise/Set
09:03 am
10:36 pm
Local Time
5:03 pm EDT
30 April, 2024
 
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MONTHLY - ALL WEATHER AVERAGES   [ Show Summary ]
[ °F ]   °C
TEMPERATURE 
Average Temperature
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
C16.711.812.313.213.51718.922.122.821.917.915.912.9

Average High Temperature
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
C23.417.91819.219.423.926.229.930.429.224.922.718.8

Average Low Temperature
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
C105.76.67.17.710.111.614.315.114.7119.27

Highest Recorded Temperature
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
C41.13029.431.733.338.338.341.140.641.137.833.330

Lowest Recorded Temperature
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
C-3.3-2.8-3.3-0.6---2.858.9107.22.82.2-1.1

Average Number of Days Above 90F/32C
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Days38.2---------0.623.8810.29.830.7---

Average Number of Days Below 32F/0C
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Days3.30.810.40.2---------------------0.9



PRECIPITATION 
Average Precipitation
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
mm55911712290461141211215183

Average Number of Days With Precipitation
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Days40666532---11235

Most Reported Precipitation in a Month
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
mm620620463358327152442658161232448311

Most Precipitation Reported in a Day
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
mm229.1229.1152.4211.6128.857.9338.957.7112.8103.6172.2138.4

Avg. No. of Days w/Precip. Above 0.1in/2.5mm
Years on Record: 30  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Days25.74.84.94.22.10.90.40.10.20.71.82.23.4

Avg. No. of Days w/Precip. Above 0.2in/5mm
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Days27554311------1124

Avg. # of Days w/Precip. Above 0.4in/10mm
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Days122321---------------112

Avg. No. of Days w/Precip. Above 0.5in/13mm
Years on Record: 30  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Days14.32.83.32.21.10.30.1------0.40.81.32

Avg. No. of Days w/Precip. Above 1in/25mm
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Days82211------------------11



DEGREE DAYS 
Heating Degree Days
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Days235.661.749.436.7301.7------------2.28.945

Cooling Degree Days
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Days520.61.74.44.47.222.253.3116.1138.3117.241.112.81.7

Growing Degree Days
Years on Record: 89  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Days2523.556.865.998.2105217266.7373.7396.1358.3246.3178.389.6



SKY CONDITIONS 
Average Length of Day
Years on Record: 30  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Hours12.610.611.412.413.514.414.914.613.812.811.710.810.4



SOLAR RADIATION 
Average Daily Solar Radiation - Global
Years on Record: 22  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Mj/m219.310.913.919.223.926.627.726.123.920.415.912.310.2

Average Daily Solar Radiation - Diffuse
Years on Record: 22  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Mj/m24.933.94.75.76.56.876.25.1432.7

Average Daily Solar Radiation - Reflected
Years on Record: 22  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Mj/m221.216.718.822.624.224.123.923.123.122.520.818.316.3

Average Daily Solar Radiation - Direct
Years on Record: 22  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Mj/m224.919.220.425.428.730.130.928.527.225.52321.418.9

Maximum Daily Solar Radiation - Global
Years on Record: 22  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Mj/m219.310.913.919.223.926.627.726.123.920.415.912.310.2

Maximum Daily Solar Radiation - Diffuse
Years on Record: 22  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Mj/m25.83.64.65.96.77.88.28.275.94.73.53.1

Maximum Daily Solar Radiation - Reflected
Years on Record: 22  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Mj/m224.218.923.525.726.426.126.426.226.525.425.721.118.9

Maximum Daily Solar Radiation - Direct
Years on Record: 22  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Mj/m230.922.727.830.933.33537.936.434.73131.425.923

Minimum Daily Solar Radiation - Global
Years on Record: 22  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Mj/m216.98.911.415.921.223.324.322.821.918.314.210.98.8

Minimum Daily Solar Radiation - Diffuse
Years on Record: 22  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Mj/m23.82.62.93.74.75.45.35.34.74.12.72.42.2

Minimum Daily Solar Radiation - Reflected
Years on Record: 22  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Mj/m218.112.614.71821.421.221.220.421.119.81815.513.5

Minimum Daily Solar Radiation - Direct
Years on Record: 22  Chart This
 ANNUAL  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC  
Mj/m219.112.91417.522.823.323.921.822.820.618.416.914.5




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