May Weather in Jersey JerseyDaily high temperatures increase by 5°F, from 57°F to 62°F, rarely falling below 51°F or exceeding 70°F. Daily low temperatures increase by 4°F, from 47°F to 52°F, rarely falling below 42°F or exceeding 55°F. For reference, on August 2, the hottest day of the year, temperatures in Jersey typically range from 58°F to 69°F, while on February 9, the coldest day of the year, they range from 40°F to 47°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. CloudsThe month of May in Jersey experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 52% to 48%. The highest chance of overcast or mostly cloudy conditions is 52% on May 5. The clearest day of the month is May 30, with clear, mostly clear, or partly cloudy conditions 52% of the time. For reference, on December 29, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 64%, while on July 17, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 61%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Jersey, the chance of a wet day over the course of May is essentially constant, remaining around 22% throughout. For reference, the year's highest daily chance of a wet day is 38% on December 11, and its lowest chance is 16% on August 1. RainfallTo show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day rainfall during May in Jersey is essentially constant, remaining about 1.4 inches throughout, and rarely exceeding 2.7 inches or falling below 0.3 inches. SunOver the course of May in Jersey, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 17 minutes, implying an average daily increase of 2 minutes, 34 seconds, and weekly increase of 18 minutes, 0 seconds. The shortest day of the month is May 1, with 14 hours, 39 minutes of daylight and the longest day is May 31, with 15 hours, 56 minutes of daylight. The latest sunrise of the month in Jersey is 5:46 AM on May 1 and the earliest sunrise is 38 minutes earlier at 5:08 AM on May 31. The earliest sunset is 8:25 PM on May 1 and the latest sunset is 39 minutes later at 9:04 PM on May 31. Daylight saving time is observed in Jersey during 2024, but it neither starts nor ends during May, so the entire month is in standard time. For reference, on June 20, the longest day of the year, the Sun rises at 5:02 AM and sets 16 hours, 14 minutes later, at 9:17 PM, while on December 21, the shortest day of the year, it rises at 8:01 AM and sets 8 hours, 12 minutes later, at 4:12 PM. The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation. MoonThe figure below presents a compact representation of key lunar data for May 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
HumidityWe base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night. The chance that a given day will be muggy in Jersey is essentially constant during May, remaining around 0% throughout. For reference, on August 18, the muggiest day of the year, there are muggy conditions 1% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time. WindThis section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages. The average hourly wind speed in Jersey is decreasing during May, decreasing from 13.5 miles per hour to 12.2 miles per hour over the course of the month. For reference, on January 1, the windiest day of the year, the daily average wind speed is 19.0 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 11.3 miles per hour. The hourly average wind direction in Jersey throughout May is predominantly from the west, with a peak proportion of 38% on May 31. Water TemperatureJersey is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water. The average surface water temperature in Jersey is increasing during May, rising by 4°F, from 51°F to 55°F, over the course of the month. Growing SeasonDefinitions 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). The growing season in Jersey typically lasts for 10 months (314 days), from around February 12 to around December 23, rarely starting after March 18, or ending before November 20. The month of May in Jersey is reliably fully within the growing season. 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. In this report, we use a base of 50°F and a cap of 86°F. The average accumulated growing degree days in Jersey are gradually increasing during May, increasing by 145°F, from 83°F to 228°F, over the course of the month. Solar EnergyThis section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation. The average daily incident shortwave solar energy in Jersey is increasing during May, rising by 1.0 kWh, from 5.5 kWh to 6.5 kWh, over the course of the month. TopographyFor the purposes of this report, the geographical coordinates of Jersey are 49.217 deg latitude, -2.117 deg longitude, and 0 ft elevation. The topography within 2 miles of Jersey is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet). The area within 2 miles of Jersey is covered by grassland (47%) and trees (39%), within 10 miles by water (92%), and within 50 miles by water (73%) and cropland (11%). Data SourcesThis report illustrates the typical weather in Jersey, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. The details of the data sources used for this report can be found on the Jersey Airport page. DisclaimerThe information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site. We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. 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. 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. 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