Even in the driest month there is a lot of rain. Newington The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. The windiest day of the year is January 31, with an average hourly wind speed of 10.9 miles per hour. Portsmouth International Airport at Pease, MERRA-2 Modern-Era Retrospective Analysis. The wetter season lasts 11 months, from September 27 to August 12, with a greater than 28% chance of a given day being a wet day. Mean Temp: 49 °F. Average Weather in Portsmouth New Hampshire, United States In Portsmouth, the summers are warm; the winters are freezing, wet, and windy; and it is partly cloudy year round. The time of year with cooler water lasts for 3.9 months, from December 30 to April 26, with an average temperature below 44°F. Rye 18 F Portsmouth International Airport at Pease Station | Report. Based on this categorization, the most common form of precipitation in Portsmouth changes throughout the year. The black line is the percentage chance that a given day is within the growing season. Portsmouth is a city with a significant rainfall. The snowless period of the year lasts for 6.9 months, from April 14 to November 10. The muggiest day of the year is July 30, with muggy conditions 34% of the time. The wind is most often from the west for 11 months, from May 22 to May 6, with a peak percentage of 50% on January 1. Showing: All Year January February March April May June July August September October November December. In 2021, the shortest day is December 21, with 9 hours, 0 minutes of daylight; the longest day is June 20, with 15 hours, 22 minutes of daylight. Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies. The air quality index in Portsmouth is 26% better than the national average. Based on this score, the best time of year to visit Portsmouth for hot-weather activities is from early July to mid August, with a peak score in the last week of July. Weather Statistics for Portsmouth, NH . The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands. July is the hottest month for the 03801 zip code with an average high temperature of 81.9°, which ranks it as warmer than most places in New Hampshire. Get current weather conditions and up-to-date forecasts for Portsmouth, NH, and the surrounding Seacoast region of New Hampshire. Portsmouth experiences significant seasonal variation in the perceived humidity. The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds. Based on weather reports collected during 1985–2015. Portsmouth experiences significant seasonal variation in monthly rainfall. In Portsmouth, the summers are warm; the winters are freezing, wet, and windy; and it is partly cloudy year round. The hottest time of year in Portsmouth is normally July. The climate here is classified as Cfb by the Köppen-Geiger system. Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations. Average annual temperatures for cities, towns, parks and lakes throughout New Hampshire are listed below in degrees Fahrenheit and Celsius. Summer is the time to visit Portsmouth, New Hampshire. Historical Portsmouth weather info such as min/max temperature, precipitation/snow data as well as heating and cooling cost index also included. The length of the day in Portsmouth varies significantly over the course of the year. Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter. The area within 2 miles of Portsmouth is covered by artificial surfaces (61%) and water (33%), within 10 miles by trees (41%) and water (38%), and within 50 miles by water (44%) and trees (41%). As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Portsmouth is located near a large body of water (e.g., ocean, sea, or large lake). Over the course of the year, the temperature typically varies from 19°F to 80°F and is rarely below 5°F or above 89°F . The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The darker period of the year lasts for 3.3 months, from November 2 to February 10, with an average daily incident shortwave energy per square meter below 2.6 kWh. The highest monthly average temperature in Portsmouthfor July is 72 degrees. The amount of rain in November is high with an average of 94mm (3.7in). Please select the information that is incorrect. Portsmouth, New Hampshire - Travel and vacation weather averages, current conditions and forecasts. The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year. The topography within 2 miles of Portsmouth is essentially flat, with a maximum elevation change of 82 feet and an average elevation above sea level of 24 feet. The darkest day of the year is December 24, with an average of 1.5 kWh. The muggier period of the year lasts for 3.2 months, from June 13 to September 19, during which time the comfort level is muggy, oppressive, or miserable at least 9% of the time. Portland, © Climate-Data.org / AM OP / OpenStreetMap contributors, Portsmouth Weather by month // weather averages, Portsmouth Climate graph // Weather by Month. Rain alone is the most common for 12 months, from January 18 to January 5. Boston July is the hottest month for Portsmouth with an average high temperature of 81.9°, which ranks it as warmer than most places in New Hampshire. ): 44.2 [The annual rainfall in inches.Snowfall (in. The links take you to data for normal temperatures, precipitation, snowfall, sunshine and humidity. January is the coldest month, with temperatures averaging -4.7 °C | 23.5 °F. Showers clearing on Thursday night. The brightest day of the year is July 2, with an average of 6.8 kWh. Based on the tourism score, the best time of year to visit Portsmouth for warm-weather activities is from late June to mid September. The hottest months of the year, August and July, are comfortably cool. We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. According to Köppen and Geiger, this climate is classified as Dfb. Shortwave radiation includes visible light and ultraviolet radiation. Portsmouth, NH climate is mild during summer when temperatures tend to be in the 60's and very cold during winter when temperatures tend to be in the 20's. The percentage of time spent in various temperature bands. Based on this score, the best time of year to visit Portsmouth for general outdoor tourist activities is from late June to mid September, with a peak score in the second week of August. Weather data is prone to errors, outages, and other defects. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. Weather.com brings you the most accurate monthly weather forecast for Portsmouth, NH with average/record and high/low temperatures, precipitation and more. Worcester The windier part of the year lasts for 6.1 months, from October 14 to April 19, with average wind speeds of more than 8.2 miles per hour. 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