Portsmouth, NH Weather - Forecast & Monthly Averages

TEMPERATURE	28
HUMIDITY	62
PRESSURE	102740
WIND COND.

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Weather Quick Facts

The highest monthly average temperature in Portsmouth for July is 71.8 degrees
The lowest monthly average temperature in Portsmouth for January is 27 degrees
The most monthly precipitation in Portsmouth occurs in September with 8.5 inches
The air quality index in Portsmouth is 12% better than the national average
The pollution index in Portsmouth is 97% better than the national average

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Portsmouth 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	19°F	36°F	27°F	5.3"
February	19°F	37°F	27°F	6.2"
March	27°F	45°F	35°F	7.3"
April	37°F	58°F	47°F	7.5"
May	47°F	68°F	57°F	7.1"
June	56°F	76°F	65°F	8.3"
July	63°F	83°F	72°F	7.9"
August	60°F	81°F	70°F	8.4"
September	54°F	74°F	63°F	8.5"
October	43°F	63°F	52°F	8.2"
November	33°F	52°F	42°F	6.9"
December	24°F	41°F	32°F	6.3"

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Portsmouth 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	Portsmouth	New Hampshire	National
Air quality index	37	34	42
Pollution index	91,790	3,959,618	2,726,193

Portsmouth air quality

Measurement	Total
Days measured	365
Days with good air quality	353
Days with moderate air quality	12
Days w/ poor A.Q. for sensitive groups	0
Days with unhealthy air quality	0

Air quality details

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

Average monthly Portsmouth temperature with heat index

Portsmouth monthly precipitation with daily maximum

Portsmouth monthly snow depth with daily maximum

Portsmouth monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Berwick, ME	1,985	27	46.0%
Hampton Beach, NH	2,485	37	26.0%
Kittery, ME	5,297	37	26.0%
Durham, NH	12,016	37	26.0%
South Eliot, ME	3,047	37	26.0%
Portsmouth, NH	21,418	37	26.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Mukilteo, WA	21,414	45	10.0%
North Bellmore, NY	21,422	51	2.0%
Duarte, CA	21,399	72	44.0%
Bear, DE	21,397	42	16.0%
Ensley, FL	21,397	41	18.0%
Portsmouth, NH	21,418	37	26.0%

Source: The Portsmouth, NH 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.