Herndon, PA Climate


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United States / Pennsylvania / Sunbury Metro Area / Northumberland County / Herndon / Zip Codes
Herndon, PA has a fairly temperate climate with hot and humid summers and cold and wet winters. The average summer temperature is usually between 70-85°F, while the average winter temperature is between 30-45°F. Rainfall in Herndon is spread out throughout the year with an average of 44 inches per year. Snowfall usually averages around 20 inches per season. Despite the colder winter temperatures, Herndon rarely sees any snow or ice storms during this time of year.

Herndon, Pennsylvania gets 42 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Herndon averages 31 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 182 sunny days per year in Herndon. The US average is 205 sunny days.

Herndon gets some kind of precipitation, on average, 124 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 85 degrees
Winter Low: the January low is 19
Rain: averages 42 inches of rain a year
Snow: averages 31 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Herndon is 7.0 (10=best), which means it is more comfortable than most places in Pennsylvania.

8.9 Summer - 5.1 Winter
June, September and August are the most pleasant months in Herndon, while January and February are the least comfortable months.

  ClimateHerndon, PennsylvaniaUnited States
  41.8 in.38.1 in.
  30.9 in.27.8 in.
  123.6 days106.2 days
  182 days205 days
  84.5°85.8°
  18.9°21.7°
  77
  3.84.3
  453 ft.2443 ft.
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Herndon with an average high temperature of 84.5°, which ranks it as warmer than most places in Pennsylvania. In Herndon, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Herndon are June, September and August.
In Herndon, there are 11.9 days annually when the high temperature is over 90°, which is hotter than most places in Pennsylvania.
January has the coldest nighttime temperatures for Herndon with an average of 18.9°. This is about average compared to other places in Pennsylvania.
In Herndon, there are 127.4 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Pennsylvania.
In Herndon, there are 1.7 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Pennsylvania.
The humidity is usually comfortable in Herndon but some summer months can be sticky or muggy. July is the most humid month, though humidity is low for most of the year. The most humid months are July, August and June.
June is the wettest month in Herndon with 4.3 inches of rain, and the driest month is February with 2.3 inches. The wettest season is Autumn with 29% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 41.8 inches in Herndon means that it is drier than most places in Pennsylvania.
May is the rainiest month in Herndon with 12.6 days of rain, and February is the driest month with only 8.3 rainy days. There are 123.6 rainy days annually in Herndon, which is less rainy than most places in Pennsylvania. The rainiest season is Summer when it rains 28% of the time and the driest is Spring with only a 22% chance of a rainy day.
An annual snowfall of 30.9 inches in Herndon means that it is about average compared to other places in Pennsylvania. January is the snowiest month in Herndon with 10.8 inches of snow, and 6 months of the year have significant snowfall.
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