Diamond Bar, CA Weather - Forecast & Monthly Averages

TEMPERATURE	56
HUMIDITY	91
PRESSURE
WIND COND.	190 6.4

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Weather Quick Facts

The highest monthly average temperature in Diamond Bar for August is 76.6 degrees
The lowest monthly average temperature in Diamond Bar for December is 53.1 degrees
The most monthly precipitation in Diamond Bar occurs in December with 2 inches
The air quality index in Diamond Bar is 111% worse than the national average
The pollution index in Diamond Bar is 69% better than the national average

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Diamond Bar Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	40°F	70°F	54°F	1.6"
February	41°F	71°F	55°F	1.4"
March	44°F	75°F	58°F	0.8"
April	47°F	78°F	61°F	0.4"
May	52°F	82°F	65°F	0.3"
June	57°F	89°F	71°F	0.0"
July	62°F	94°F	76°F	0.1"
August	61°F	96°F	77°F	0.0"
September	59°F	94°F	74°F	0.1"
October	52°F	86°F	67°F	0.3"
November	44°F	78°F	60°F	0.4"
December	39°F	69°F	53°F	2.0"

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Diamond Bar air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
Index	Diamond Bar	California	National
Air quality index	89	55	42
Pollution index	858,652	10,473,190	2,726,193

Diamond Bar air quality information

Measurement	Total
Days measured	365
Days with good air quality	42
Days with moderate air quality	178
Days w/ poor A.Q. for sensitive groups	79
Days with unhealthy air quality	58

Diamond Bar air quality information

Pollutant	Total
Arsenic	0.002%
Benzene	0.010%
Carbon Tetrachloride	0.000%
Lead	0.020%
Mercury	0.001%

Average monthly Diamond Bar temperature with heat index

Diamond Bar monthly precipitation with daily maximum

Diamond Bar monthly snow depth with daily maximum

Diamond Bar monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Azusa, CA	49,584	72	44.0%
Citrus, CA	10,105	72	44.0%
Irwindale, CA	1,365	72	44.0%
Valinda, CA	22,665	72	44.0%
West Puente Valley, CA	23,555	72	44.0%
Diamond Bar, CA	55,870	89	78.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Commerce City, CO	55,891	58	16.0%
Tamiami, FL	55,757	41	18.0%
New Brunswick, NJ	55,992	41	18.0%
Kendale Lakes, FL	55,732	41	18.0%
Pocatello, ID	56,016	27	46.0%
Diamond Bar, CA	55,870	89	78.0%

Source: The Diamond Bar, CA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.