April Weather in Deerfield New Hampshire, United StatesDaily high temperatures increase by 14°F, from 43°F to 57°F, rarely falling below 32°F or exceeding 71°F. Daily low temperatures increase by 10°F, from 24°F to 35°F, rarely falling below 13°F or exceeding 45°F. For reference, on July 19, the hottest day of the year, temperatures in Deerfield typically range from 54°F to 75°F, while on January 30, the coldest day of the year, they range from 4°F to 24°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. 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 April in Deerfield experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 57% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 57% on April 28. The clearest day of the month is April 28, with clear, mostly clear, or partly cloudy conditions 43% of the time. For reference, on January 4, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 68%, while on September 1, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 62%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Deerfield, the chance of a wet day over the course of April is essentially constant, remaining around 30% throughout. For reference, the year's highest daily chance of a wet day is 42% on July 7, and its lowest chance is 21% on February 4. Over the course of April in Deerfield, the chance of a day with only rain increases from 16% to 27%, the chance of a day with mixed snow and rain decreases from 7% to 3%, and the chance of a day with only snow decreases from 6% to 0%. 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 April in Deerfield is increasing, starting the month at 1.9 inches, when it rarely exceeds 3.2 inches or falls below 0.6 inches, and ending the month at 2.9 inches, when it rarely exceeds 4.7 inches or falls below 1.1 inches. SnowfallAs with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day snowfall during April in Deerfield is very rapidly decreasing, starting the month at 9.3 inches, when it rarely exceeds 19.6 inches or falls below 1.1 inches, and ending the month at 1.9 inches, when it rarely exceeds 6.7 inches or falls below -0.0 inches. SunOver the course of April in Deerfield, 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, 24 minutes, implying an average daily increase of 2 minutes, 53 seconds, and weekly increase of 20 minutes, 14 seconds. The shortest day of the month is April 1, with 12 hours, 48 minutes of daylight and the longest day is April 30, with 14 hours, 12 minutes of daylight. The latest sunrise of the month in Deerfield is 6:26 AM on April 1 and the earliest sunrise is 48 minutes earlier at 5:38 AM on April 30. The earliest sunset is 7:14 PM on April 1 and the latest sunset is 35 minutes later at 7:49 PM on April 30. Daylight saving time is observed in Deerfield during 2024, but it neither starts nor ends during April, 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 15 hours, 31 minutes later, at 8:33 PM, while on December 21, the shortest day of the year, it rises at 7:19 AM and sets 8 hours, 52 minutes later, at 4:10 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 April 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 Deerfield is essentially constant during April, remaining around 0% throughout. For reference, on July 28, the muggiest day of the year, there are muggy conditions 9% 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 Deerfield is decreasing during April, decreasing from 6.2 miles per hour to 5.1 miles per hour over the course of the month. For reference, on February 20, the windiest day of the year, the daily average wind speed is 6.9 miles per hour, while on August 7, the calmest day of the year, the daily average wind speed is 3.5 miles per hour. The hourly average wind direction in Deerfield throughout April is predominantly from the west, with a peak proportion of 38% on April 2. 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 Deerfield typically lasts for 3.6 months (110 days), from around May 26 to around September 13, rarely starting before May 8 or after June 13, and rarely ending before August 27 or after September 30. The month of April in Deerfield is very likely fully outside of the growing season, with the chance that a given day is in the growing season gradually increasing from 0% to 3% over the course of the month. 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 Deerfield are gradually increasing during April, increasing by 44°F, from 6°F to 50°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 Deerfield is increasing during April, rising by 1.1 kWh, from 4.4 kWh to 5.4 kWh, over the course of the month. TopographyFor the purposes of this report, the geographical coordinates of Deerfield are 44.231 deg latitude, -71.617 deg longitude, and 1,572 ft elevation. The topography within 2 miles of Deerfield contains very significant variations in elevation, with a maximum elevation change of 1,867 feet and an average elevation above sea level of 1,773 feet. Within 10 miles contains very significant variations in elevation (4,531 feet). Within 50 miles also contains extreme variations in elevation (5,994 feet). The area within 2 miles of Deerfield is covered by trees (94%), within 10 miles by trees (93%), and within 50 miles by trees (91%). Data SourcesThis report illustrates the typical weather in Deerfield, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointThere are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Deerfield. For each station, the records are corrected for the elevation difference between that station and Deerfield according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. The estimated value at Deerfield is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Deerfield and a given station. The stations contributing to this reconstruction are:
To get a sense of how much these sources agree with each other, you can view a comparison of Deerfield and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data. Other DataAll data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus. All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid. Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations. Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory. Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database . Time zones for airports and weather stations are provided by AskGeo.com . Maps are © OpenStreetMap contributors. 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. Please review our full terms contained on our Terms of Service page. |