Global Summary of the Month and Year, Version 1.0. This page pulls together information on when, how much and how often Philadelphia, Pennsylvania has snow. The length of the day in Philadelphia varies significantly over the course of the year. Just over half the days of snowfall in Philadelphia result in a skiff of less than an inch left on the ground. Philadelphia experiences extreme seasonal variation in the perceived humidity. The big snowstorms don't seem to hit until February & March (and occasionally, we'll get … The least snow falls around July 31, with an average total liquid-equivalent accumulation of 0.0 inches. The time of year with warmer water lasts for 3.5 months, from June 19 to October 2, with an average temperature above 67°F. May result in Rain, Snow, or Sleet. Global Summary of the Month and Year, Version 1.0. Copyright © 2020 Current Results Publishing Ltd. This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. Shortwave radiation includes visible light and ultraviolet radiation. MERRA-2 Modern-Era Retrospective Analysis. Today’s and tonight’s Philadelphia, PA weather forecast, weather conditions and Doppler radar from The Weather Channel and Weather.com Contact Us | 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. Rain falls throughout the year in Philadelphia. The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. The time of year with cooler water lasts for 3.6 months, from December 21 to April 7, with an average temperature below 46°F. To characterize how pleasant the weather is in Philadelphia throughout the year, we compute two travel scores. Philadelphia averages 13 inches of snow per year. The predominant average hourly wind direction in Philadelphia varies throughout the year. Get the monthly weather forecast for Philadelphia, PA, including daily high/low, historical averages, to help you plan ahead. The percentage of time spent in various temperature bands. Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter. The thin dotted lines are the corresponding average perceived temperatures. Snowstorms this severe have appeared in the months of December, January and February. 2016. The average water temperature experiences significant seasonal variation over the course of the year. The snowiest periods will occur in mid- and late January and early February. The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database . The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. The clearer part of the year in Philadelphia begins around June 24 and lasts for 4.6 months, ending around November 12. In Philadelphia, the summers are warm and humid, the winters are very cold, and it is wet and partly cloudy year round. Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere). On average, there are 207 sunny days per year in Philadelphia. Yet half the years receive less than 1.3 inches for the month. In Philadelphia, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year. 1981-2010 U.S. The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Chance of Snow Storms for Philadelphia, Pennsylvania covering the 2020-2021 Snow Season. Based on growing degree days alone, the first spring blooms in Philadelphia should appear around March 29, only rarely appearing before March 13 or after April 13. Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC. We used to see our first snow in November, now it's more like December. FTP. 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. Based on this score, the best time of year to visit Philadelphia for hot-weather activities is from late June to late August, with a peak score in the last week of July. The cold season lasts for 3.1 months, from December 1 to March 6, with an average daily high temperature below 49°F. The brighter period of the year lasts for 3.8 months, from April 27 to August 22, with an average daily incident shortwave energy per square meter above 5.9 kWh. We report snowfall in liquid-equivalent terms. The growing season in Philadelphia typically lasts for 7.2 months (222 days), from around April 1 to around November 9, rarely starting before March 15 or after April 17, and rarely ending before October 23 or after November 25. Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. The hottest day of the year is July 20, with an average high of 87°F and low of 70°F. There are data and descriptions here of how many days it snows and the total amount of snowfall that Philadelphia usually gets. We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader. The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. SnowChance calculates the likelihood of a Winter Storm entering a region on a specific day. Philadelphia experiences some seasonal variation in monthly liquid-equivalent snowfall. Climate Normals. Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The last snowfall can happen in February, March or April. In December, for instance, one in four years totals over 5.9 inches of snow. Based on this score, the best times of year to visit Philadelphia for general outdoor tourist activities are from early June to early July and from early August to late September, with a peak score in the first week of September. The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands. The number of hours during which the Sun is visible (black line). The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands. There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Philadelphia. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands. The numbers are for the total amount of snow and for how many days it snows at least 0.1 inches (0.25 centimetres). 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 US average is 28 inches of snow per year. Within 50 miles contains only modest variations in elevation (1,250 feet). Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. We assume no responsibility for any decisions made on the basis of the content presented on this site. Precipitation is rain, snow, sleet, or hail that falls to the ground. support@__remove_this_part__weatherspark.com. The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than. Philadelphia is normally free of snow every year from May to October. The earliest sunset is at 4:35 PM on December 7, and the latest sunset is 3 hours, 58 minutes later at 8:33 PM on June 27. Snowstorms of over five inches a day happen on average about once a year. A team of entrepreneurs in New England managed to make their own snow with a machine. The drier season lasts 7.1 months, from August 26 to March 30. The least rain falls around February 7, with an average total accumulation of 2.1 inches. Orange = Chance of a Winter Storm. © SnowChance 2020. The chance of a wet day peaks at 37% on July 28. The estimated value at Philadelphia is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Philadelphia and a given station. Snow mostly accumulates during January and February. 1950-51, 4.6 inches: It wasn’t all that warm, but for a second-consecutive year (see 1949-50 below) snow stiffed Philly in a decade that featured three seasons with under 10 inches. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end. But December 1950 marked a seminal moment in the history of snow deprivation. For five days a year on average, the amount of new snow totals at least an inch. The darker period of the year lasts for 3.1 months, from November 5 to February 9, with an average daily incident shortwave energy per square meter below 2.8 kWh.

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