Average Weather at Logan International Airport Massachusetts, United States
At Logan International Airport, the summers are warm, the winters are very cold and wet, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 23°F to 82°F and is rarely below 10°F or above 91°F.
Based on the tourism score, the best time of year to visit Logan International Airport for warm-weather activities is from late June to mid September.
The warm season lasts for 3.3 months, from June 6 to September 15, with an average daily high temperature above 73°F. The hottest day of the year is July 20, with an average high of 82°F and low of 67°F.
The cold season lasts for 3.4 months, from December 4 to March 15, with an average daily high temperature below 45°F. The coldest day of the year is January 29, with an average low of 23°F and high of 36°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
At Logan International Airport, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.
The clearer part of the year at Logan International Airport begins around June 26 and lasts for 4.4 months, ending around November 6. On September 6, 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 November 6 and lasts for 7.6 months, ending around June 26. On May 24, the cloudiest day of the year, the sky is overcast or mostly cloudy 54% of the time, and clear, mostly clear, or partly cloudy 46% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
Logan International Airport 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 throughout the year is rain alone, with a peak probability of 33% on May 24.
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. Logan International Airport experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year at Logan International Airport. The most rain falls during the 31 days centered around October 23, with an average total accumulation of 3.9 inches.
The least rain falls around January 24, with an average total accumulation of 2.3 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. Logan International Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.0 months, from November 13 to April 11, 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 26, with an average total liquid-equivalent accumulation of 0.8 inches.
The snowless period of the year lasts for 7.0 months, from April 11 to November 13. The least snow falls around August 4, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day at Logan International Airport varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 5 minutes of daylight; the longest day is June 21, with 15 hours, 17 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:06 AM on June 14, and the latest sunrise is 2 hours, 13 minutes later at 7:19 AM on November 3. The earliest sunset is at 4:11 PM on December 7, and the latest sunset is 4 hours, 14 minutes later at 8:25 PM on June 26.
Daylight saving time (DST) is observed at Logan International Airport 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
Logan International Airport experiences significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.3 months, from June 12 to September 22, during which time the comfort level is muggy, oppressive, or miserable at least 9% of the time. The muggiest day of the year is August 2, with muggy conditions 38% of the time.
The least muggy day of the year is December 12, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed at Logan International Airport experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 5.9 months, from October 23 to April 21, with average wind speeds of more than 7.2 miles per hour. The windiest day of the year is February 20, with an average hourly wind speed of 9.5 miles per hour.
The calmer time of year lasts for 6.1 months, from April 21 to October 23. The calmest day of the year is July 31, with an average hourly wind speed of 5.0 miles per hour.
Average Wind Speed
The predominant average hourly wind direction at Logan International Airport is from the west throughout the year.
Logan International Airport 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 3.0 months, from June 25 to September 26, with an average temperature above 60°F. The day of the year with the warmest water is August 7, with an average temperature of 66°F.
The time of year with cooler water lasts for 3.8 months, from December 28 to April 22, with an average temperature below 44°F. The day of the year with the coolest water is March 2, with an average temperature of 38°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is at Logan International Airport 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 Logan International Airport for general outdoor tourist activities is from late June to mid September, with a peak score in the last 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 Logan International Airport for hot-weather activities is from early July to mid August, with a peak score in the last week of July.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
The growing season at Logan International Airport typically lasts for 7.3 months (222 days), from around April 4 to around November 12, rarely starting before March 17 or after April 24, and rarely ending before October 28 or after November 29.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms at Logan International Airport should appear around April 24, only rarely appearing before April 8 or after May 6.
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 6 to August 20, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest day of the year is June 30, with an average of 6.8 kWh.
The darker period of the year lasts for 3.3 months, from November 3 to February 11, with an average daily incident shortwave energy per square meter below 2.6 kWh. The darkest day of the year is December 24, with an average of 1.6 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Logan International Airport are 42.365 deg latitude, -71.018 deg longitude, and 3 ft elevation.
The topography within 2 miles of Logan International Airport contains only modest variations in elevation, with a maximum elevation change of 148 feet and an average elevation above sea level of 8 feet. Within 10 miles also contains only modest variations in elevation (463 feet). Within 50 miles contains only modest variations in elevation (2,037 feet).
The area within 2 miles of Logan International Airport is covered by artificial surfaces (58%) and water (39%), within 10 miles by artificial surfaces (56%) and water (39%), and within 50 miles by trees (37%) and water (35%).
This report illustrates the typical weather at Logan International Airport, 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
Logan International Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.
In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.
The stations on which we may fall back include but are not limited to East Milton, Cranland Airport, Norwood Memorial Airport, Beverly Municipal Airport, Lawrence G Hanscom Field, Lawrence Municipal Airport, Marshfield Airport, and Taunton Municipal Airport.
Time zones for aiports and weather stations are provided by AskGeo.com .