Average Weather in Westbrook Maine, United States
In Westbrook, the summers are warm, the winters are freezing, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 14°F to 79°F and is rarely below -1°F or above 87°F.
Based on the tourism score, the best time of year to visit Westbrook for warm-weather activities is from late June to mid September.
The warm season lasts for 3.4 months, from June 4 to September 17, with an average daily high temperature above 69°F. The hottest day of the year is July 27, with an average high of 79°F and low of 61°F.
The cold season lasts for 3.3 months, from December 3 to March 14, with an average daily high temperature below 40°F. The coldest day of the year is January 29, with an average low of 14°F and high of 31°F.
Average High and Low Temperature
Average Hourly Temperature
In Westbrook, 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 Westbrook begins around June 28 and lasts for 4.1 months, ending around October 30. On September 2, 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 30 and lasts for 7.9 months, ending around June 28. On May 17, the cloudiest day of the year, the sky is overcast or mostly cloudy 56% of the time, and clear, mostly clear, or partly cloudy 44% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Westbrook varies throughout the year.
The wetter season lasts 9.1 months, from March 20 to December 23, with a greater than 28% chance of a given day being a wet day. The chance of a wet day peaks at 33% on June 14.
The drier season lasts 2.9 months, from December 23 to March 20. The smallest chance of a wet day is 22% on February 5.
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 Westbrook changes throughout the year.
Rain alone is the most common for 9.9 months, from February 22 to December 20. The highest chance of a day with rain alone is 33% on June 14.
Snow alone is the most common for 2.1 months, from December 20 to February 22. The highest chance of a day with snow alone is 12% on January 10.
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. Westbrook experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Westbrook. The most rain falls during the 31 days centered around October 23, with an average total accumulation of 4.3 inches.
The least rain falls around January 22, with an average total accumulation of 1.3 inches.
Average Monthly Rainfall
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Westbrook experiences significant seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.8 months, from October 28 to April 23, 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 18, with an average total liquid-equivalent accumulation of 1.6 inches.
The snowless period of the year lasts for 6.2 months, from April 23 to October 28. The least snow falls around July 21, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Westbrook varies significantly over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 55 minutes of daylight; the longest day is June 21, with 15 hours, 27 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 4:59 AM on June 15, and the latest sunrise is 2 hours, 21 minutes later at 7:19 AM on November 3. The earliest sunset is at 4:04 PM on December 9, and the latest sunset is 4 hours, 23 minutes later at 8:27 PM on June 27.
Daylight saving time (DST) is observed in Westbrook during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
Westbrook experiences some seasonal variation in the perceived humidity.
The muggier period of the year lasts for 2.9 months, from June 17 to September 15, during which time the comfort level is muggy, oppressive, or miserable at least 7% of the time. The muggiest day of the year is July 30, with muggy conditions 26% of the time.
The least muggy day of the year is February 23, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Westbrook experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 6.0 months, from October 19 to April 21, with average wind speeds of more than 7.1 miles per hour. The windiest day of the year is February 20, with an average hourly wind speed of 9.3 miles per hour.
The calmer time of year lasts for 6.0 months, from April 21 to October 19. The calmest day of the year is July 31, with an average hourly wind speed of 4.9 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Westbrook varies throughout the year.
The wind is most often from the south for 3.9 weeks, from April 28 to May 25, with a peak percentage of 31% on May 19. The wind is most often from the west for 11 months, from May 25 to April 28, with a peak percentage of 48% on January 1.
Westbrook 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 28 to September 24, with an average temperature above 58°F. The day of the year with the warmest water is August 9, with an average temperature of 63°F.
The time of year with cooler water lasts for 3.7 months, from January 3 to April 25, with an average temperature below 43°F. The day of the year with the coolest water is March 10, with an average temperature of 38°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Westbrook throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Westbrook for general outdoor tourist activities is from late June to mid September, with a peak score in the second week of August.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Westbrook for hot-weather activities is from early July to mid August, with a peak score in the last week of July.
The growing season in Westbrook typically lasts for 5.5 months (167 days), from around April 28 to around October 12, rarely starting before April 12 or after May 14, and rarely ending before September 27 or after October 29.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Westbrook should appear around May 8, only rarely appearing before April 28 or after May 18.
Growing Degree Days
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 7 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 6.7 kWh.
The darker period of the year lasts for 3.3 months, from November 1 to February 9, 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 Westbrook are 43.677 deg latitude, -70.371 deg longitude, and 92 ft elevation.
The topography within 2 miles of Westbrook contains only modest variations in elevation, with a maximum elevation change of 226 feet and an average elevation above sea level of 89 feet. Within 10 miles contains only modest variations in elevation (561 feet). Within 50 miles contains significant variations in elevation (3,425 feet).
The area within 2 miles of Westbrook is covered by artificial surfaces (69%), trees (19%), and cropland (12%), within 10 miles by trees (54%) and artificial surfaces (26%), and within 50 miles by trees (53%) and water (39%).
This report illustrates the typical weather in Westbrook, 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 Westbrook.
For each station, the records are corrected for the elevation difference between that station and Westbrook 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 Westbrook is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Westbrook and a given station.
The stations contributing to this reconstruction are: Portland International Jetport (86%, 6 kilometers, southeast); Sanford Seacoast Regional Airport (5%, 42 kilometers, southwest); Auburn/Lewiston Municipal Airport (5%, 42 kilometers, north); and Fryeburg/Eastern Slopes Regional Airport (3.2%, 58 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .