Average Weather in April in Swanville Maine, United States
Daily high temperatures increase by 12°F, from 46°F to 58°F, rarely falling below 36°F or exceeding 69°F.
Daily low temperatures increase by 10°F, from 29°F to 39°F, rarely falling below 19°F or exceeding 47°F.
For reference, on July 27, the hottest day of the year, temperatures in Swanville typically range from 60°F to 79°F, while on January 29, the coldest day of the year, they range from 10°F to 28°F.
Average High and Low Temperature in April
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.
Average Hourly Temperature in April
The month of April in Swanville experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 56% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 55% on April 7.
The clearest day of the month is April 7, with clear, mostly clear, or partly cloudy conditions 45% of the time.
For reference, on May 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on September 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 63%.
Cloud Cover Categories in April
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Swanville, the chance of a wet day over the course of April is essentially constant, remaining around 29% throughout.
For reference, the year's highest daily chance of a wet day is 33% on June 14, and its lowest chance is 23% on February 21.
Over the course of April in Swanville, the chance of a day with only rain increases from 20% to 28%, the chance of a day with mixed snow and rain decreases from 5% to 1%, and the chance of a day with only snow decreases from 2% to 0%.
Probability of Precipitation in April
The average sliding 31-day rainfall during April in Swanville is gradually increasing, starting the month at 2.9 inches, when it rarely exceeds 4.6 inches or falls below 1.1 inches, and ending the month at 3.3 inches, when it rarely exceeds 5.2 inches or falls below 1.0 inches.
Average Monthly Rainfall in April
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during April in Swanville is decreasing, starting the month at 0.6 inches, when it rarely exceeds 1.4 inches, and ending the month at 0.1 inches, when it rarely exceeds 0.3 inches.
Average Monthly Liquid-Equivalent Snowfall in April
Over the course of April in Swanville, 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, 25 minutes, implying an average daily increase of 2 minutes, 56 seconds, and weekly increase of 20 minutes, 29 seconds.
The shortest day of the month is April 1, with 12 hours, 47 minutes of daylight and the longest day is April 30, with 14 hours, 12 minutes of daylight.
Hours of Daylight and Twilight in April
The latest sunrise of the month in Swanville is 6:16 AM on April 1 and the earliest sunrise is 49 minutes earlier at 5:27 AM on April 30.
The earliest sunset is 7:03 PM on April 1 and the latest sunset is 36 minutes later at 7:39 PM on April 30.
Daylight saving time is observed in Swanville during 2021, but it neither starts nor ends during April, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 4:51 AM and sets 15 hours, 33 minutes later, at 8:24 PM, while on December 21, the shortest day of the year, it rises at 7:09 AM and sets 8 hours, 50 minutes later, at 3:59 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in April
The figure below presents a compact representation of key lunar data for April 2021. 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.
Moon Rise, Set & Phases in April
The chance that a given day will be muggy in Swanville is essentially constant during April, remaining around 0% throughout.
For reference, on August 1, the muggiest day of the year, there are muggy conditions 17% of the time, while on November 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in April
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Swanville is decreasing during April, decreasing from 6.7 miles per hour to 5.7 miles per hour over the course of the month.
For reference, on March 8, the windiest day of the year, the daily average wind speed is 7.2 miles per hour, while on August 1, the calmest day of the year, the daily average wind speed is 4.2 miles per hour.
Average Wind Speed in April
The wind direction in Swanville during April is predominantly out of the north from April 1 to April 29 and the south from April 29 to April 30.
Wind Direction in April
Swanville 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 Swanville is increasing during April, rising by 4°F, from 37°F to 42°F, over the course of the month.
Average Water Temperature in April
The growing season in Swanville typically lasts for 5.2 months (160 days), from around May 2 to around October 8, rarely starting before April 15 or after May 18, and rarely ending before September 23 or after October 24.
The month of April in Swanville is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season rapidly increasing from 0% to 45% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in April
The average accumulated growing degree days in Swanville are gradually increasing during April, increasing by 41°F, from 7°F to 47°F, over the course of the month.
Growing Degree Days in April
The average daily incident shortwave solar energy in Swanville is increasing during April, rising by 1.1 kWh, from 4.3 kWh to 5.4 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in April
For the purposes of this report, the geographical coordinates of Swanville are 44.521 deg latitude, -68.998 deg longitude, and 203 ft elevation.
The topography within 2 miles of Swanville contains only modest variations in elevation, with a maximum elevation change of 433 feet and an average elevation above sea level of 310 feet. Within 10 miles contains only modest variations in elevation (1,043 feet). Within 50 miles also contains very significant variations in elevation (1,529 feet).
The area within 2 miles of Swanville is covered by trees (91%), within 10 miles by trees (82%) and water (13%), and within 50 miles by trees (66%) and water (26%).
This report illustrates the typical weather in Swanville, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Swanville.
For each station, the records are corrected for the elevation difference between that station and Swanville 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 Swanville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Swanville and a given station.
The stations contributing to this reconstruction are: Bangor International Airport (39%, 34 kilometers, northeast); Hancock County-Bar Harbor Airport (21%, 51 kilometers, east); Knox County Regional Airport (21%, 51 kilometers, south); and Waterville Robert Lafleur Airport (20%, 53 kilometers, west).
Time zones for airports and weather stations are provided by AskGeo.com .