Average Weather in Boothbay Maine, United States
In Boothbay, the summers are comfortable, the winters are freezing and windy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 15°F to 76°F and is rarely below 0°F or above 84°F.
The warm season lasts for 3.3 months, from June 6 to September 16, with an average daily high temperature above 68°F. The hottest day of the year is July 27, with an average high of 76°F and low of 60°F.
The cold season lasts for 3.3 months, from December 4 to March 14, with an average daily high temperature below 41°F. The coldest day of the year is January 29, with an average low of 15°F and high of 32°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. 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.
Average Hourly Temperature
In Boothbay, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Boothbay begins around June 26 and lasts for 4.1 months, ending around October 31. On September 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 64% of the time, and overcast or mostly cloudy 36% of the time.
The cloudier part of the year begins around October 31 and lasts for 7.9 months, ending around June 26. On May 15, the cloudiest day of the year, the sky is overcast or mostly cloudy 57% of the time, and clear, mostly clear, or partly cloudy 43% of the time.
Cloud Cover Categories
Boothbay does not experience significant seasonal variation in the frequency of wet days (i.e., those with greater than 0.04 inches of liquid or liquid-equivalent precipitation). The frequency ranges from 23% to 33%, with an average value of 28%.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation in Boothbay changes throughout the year.
Rain alone is the most common for 11 months, from February 4 to January 7. The highest chance of a day with rain alone is 33% on June 14.
Snow alone is the most common for 4.0 weeks, from January 7 to February 4. The highest chance of a day with snow alone is 10% on January 17.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Boothbay experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Boothbay. The most rain falls during the 31 days centered around November 4, with an average total accumulation of 4.3 inches.
The least rain falls around January 23, with an average total accumulation of 1.8 inches.
Average Monthly Rainfall
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. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Boothbay experiences significant seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.5 months, from November 2 to April 18, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 19, with an average total liquid-equivalent accumulation of 1.3 inches.
The snowless period of the year lasts for 6.5 months, from April 18 to November 2. The least snow falls around July 23, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Boothbay varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 54 minutes of daylight; the longest day is June 21, with 15 hours, 28 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 4:55 AM on June 14, and the latest sunrise is 2 hours, 23 minutes later at 7:19 AM on November 4. The earliest sunset is at 4:00 PM on December 9, and the latest sunset is 4 hours, 24 minutes later at 8:25 PM on June 26.
Daylight saving time (DST) is observed in Boothbay during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
We 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.
Boothbay experiences some seasonal variation in the perceived humidity.
The muggier period of the year lasts for 2.7 months, from June 22 to September 12, during which time the comfort level is muggy, oppressive, or miserable at least 6% of the time. The muggiest day of the year is August 2, with muggy conditions 23% of the time.
The least muggy day of the year is March 6, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
This 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 Boothbay experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 6.2 months, from October 14 to April 19, with average wind speeds of more than 8.6 miles per hour. The windiest day of the year is January 31, with an average hourly wind speed of 11.3 miles per hour.
The calmer time of year lasts for 5.8 months, from April 19 to October 14. The calmest day of the year is July 31, with an average hourly wind speed of 5.8 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Boothbay varies throughout the year.
The wind is most often from the north for 1.9 months, from February 21 to April 17, with a peak percentage of 37% on February 23. The wind is most often from the south for 5.6 months, from April 17 to October 5, with a peak percentage of 43% on July 2. The wind is most often from the west for 4.6 months, from October 5 to February 21, with a peak percentage of 44% on January 1.
Boothbay 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 water temperature experiences significant seasonal variation over the course of the year.
The time of year with warmer water lasts for 2.9 months, from June 30 to September 26, with an average temperature above 56°F. The day of the year with the warmest water is August 8, with an average temperature of 61°F.
The time of year with cooler water lasts for 3.6 months, from January 8 to April 26, with an average temperature below 42°F. The day of the year with the coolest water is March 10, with an average temperature of 38°F.
Average Water Temperature
This 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 experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.5 months, from May 9 to August 23, with an average daily incident shortwave energy per square meter above 5.7 kWh. The brightest day of the year is July 1, with an average of 6.8 kWh.
The darker period of the year lasts for 3.3 months, from November 1 to February 11, with an average daily incident shortwave energy per square meter below 2.5 kWh. The darkest day of the year is December 24, with an average of 1.5 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Boothbay are 43.876 deg latitude, -69.634 deg longitude, and 56 ft elevation.
The topography within 2 miles of Boothbay contains only modest variations in elevation, with a maximum elevation change of 302 feet and an average elevation above sea level of 92 feet. Within 10 miles also contains only modest variations in elevation (348 feet). Within 50 miles contains only modest variations in elevation (1,719 feet).
The area within 2 miles of Boothbay is covered by trees (78%), within 10 miles by water (52%) and trees (43%), and within 50 miles by water (55%) and trees (38%).
This report illustrates the typical weather in Boothbay, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Boothbay.
For each station, the records are corrected for the elevation difference between that station and Boothbay 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 Boothbay is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Boothbay and a given station.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The 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.