Altadena (CA) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Altadena

Altadena average temperature chart (Celsius) Altadena average temperature chart (Fahrenheit)
Average monthly temperatures in Altadena (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 12.8 14.2 14.7 17.4 21.5 26.2 31 30.9 27.5 22.6 16.5 12.7
°F 55.1 57.5 58.5 63.4 70.7 79.2 87.7 87.6 81.5 72.8 61.7 54.9

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Altadena monthly rainfall chart (mm) Altadena monthly rainfall chart (inches)
Average monthly rainfall in Altadena (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 76 63 55 32 10 3 5 7 8 9 49 55
inches 3 2.5 2.2 1.3 0.4 0.1 0.2 0.3 0.3 0.3 1.9 2.2
Rainy days 5 5 6 3 1 1 0 1 2 2 4 4

Average annual rainfall in Altadena: 287.467mm (113.2 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Altadena

Altadena average daily sunshine chart
Average daily sunshine Altadena
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 7.3 8.2 8.7 10.3 10.1 11 12.1 11.6 10.2 9 7.6 7.3

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Altadena average minimum / maximum temperatures (Celsius) Altadena average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Altadena (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 0.5 1.5 2.4 4.1 7.8 11.7 15.5 15.4 12.1 8 3.6 0.4
Max °C 13.2 14.5 15.1 17.8 21.9 26.6 31.4 31.3 27.9 23 16.8 13.1
Min °F 32.8 34.7 36.2 39.3 46 53 59.8 59.6 53.8 46.4 38.5 32.6
Max °F 44.2 46.4 47.7 51.6 58.6 66.4 74.1 73.9 68 59.9 50.4 44.1

Sea temperature

The graph below shows the average sea temperature.

Altadena average sea temperature chart (Celsius) Altadena average sea temperature chart (Fahrenheit)
Average sea temperature around Altadena in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 14.4 14.3 14.3 14.3 15 16.1 17.8 18.6 18.6 17.9 16.6 15.1
°F 57.9 57.7 57.7 57.8 59 61.1 64 65.5 65.5 64.3 61.9 59.1

Wind speed

The graph below shows the average wind speed.

Altadena average winspeed by month (km/h) Altadena average winspeed by month (mph)
Average wind speed in Altadena (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 12 13 14 15 15 14 14 13 13 12 12 11
mph 7 8 9 9 9 9 9 8 8 7 7 7

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Altadena relative humidity averages
Average relative humidity in Altadena
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
64% 64% 62% 59% 59% 60% 61% 63% 63% 62% 64% 65%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Altadena weather stats

Altadena weather statistics
Hottest month: July 31°C 87.8°F
Driest month: June 3mm 0.1ins
Sunniest month: August 11.6hrs
Coldest month: December 12.7°C 54.9°F
Wettest month: January 76mm 3ins
Warmest sea: September 18.6°C 65.5°F
Map showing location of Altadena (34.18973, -118.13118) Altadena map pin © Google

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