Average Weather in Lowell Massachusetts, United States
In Lowell, 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 18°F to 84°F and is rarely below 3°F or above 92°F.
Based on the tourism score, the best time of year to visit Lowell for warm-weather activities is from mid June to mid September.
The warm season lasts for 3.4 months, from June 2 to September 15, with an average daily high temperature above 74°F. The hottest day of the year is July 21, with an average high of 84°F and low of 64°F.
The cold season lasts for 3.4 months, from December 1 to March 13, with an average daily high temperature below 44°F. The coldest day of the year is January 29, with an average low of 18°F and high of 35°F.
Average High and Low Temperature
Average Hourly Temperature
In Lowell, 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 in Lowell begins around June 26 and lasts for 4.2 months, ending around October 31. 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 October 31 and lasts for 7.9 months, ending around June 26. On February 28, the cloudiest day of the year, the sky is overcast or mostly cloudy 55% of the time, and clear, mostly clear, or partly cloudy 45% 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 Lowell varies throughout the year.
The wetter season lasts 5.0 months, from March 19 to August 17, with a greater than 28% chance of a given day being a wet day. The chance of a wet day peaks at 34% on May 29.
The drier season lasts 7.0 months, from August 17 to March 19. The smallest chance of a wet day is 22% on January 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 Lowell changes throughout the year.
Rain alone is the most common for 12 months, from January 15 to January 8. The highest chance of a day with rain alone is 34% on May 29.
Snow alone is the most common for 1.0 weeks, from January 8 to January 15. The highest chance of a day with snow alone is 9% on January 9.
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. Lowell experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Lowell. The most rain falls during the 31 days centered around October 15, with an average total accumulation of 3.9 inches.
The least rain falls around January 23, with an average total accumulation of 1.6 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. Lowell experiences significant seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.4 months, from November 1 to April 14, 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 24, with an average total liquid-equivalent accumulation of 1.2 inches.
The snowless period of the year lasts for 6.6 months, from April 14 to November 1. 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 Lowell varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 3 minutes of daylight; the longest day is June 21, with 15 hours, 19 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:06 AM on June 15, and the latest sunrise is 2 hours, 15 minutes later at 7:21 AM on November 3. The earliest sunset is at 4:11 PM on December 7, and the latest sunset is 4 hours, 16 minutes later at 8:27 PM on June 27.
Daylight saving time (DST) is observed in Lowell 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
Lowell experiences significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.3 months, from June 9 to September 20, during which time the comfort level is muggy, oppressive, or miserable at least 10% of the time. The muggiest day of the year is July 30, with muggy conditions 39% of the time.
The least muggy day of the year is February 20, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Lowell experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 5.6 months, from November 4 to April 24, with average wind speeds of more than 5.6 miles per hour. The windiest day of the year is February 23, with an average hourly wind speed of 7.3 miles per hour.
The calmer time of year lasts for 6.4 months, from April 24 to November 4. The calmest day of the year is July 31, with an average hourly wind speed of 3.9 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Lowell is from the west throughout the year.
Lowell 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 25, with an average temperature above 60°F. The day of the year with the warmest water is August 7, with an average temperature of 65°F.
The time of year with cooler water lasts for 3.9 months, from December 28 to April 23, with an average temperature below 44°F. The day of the year with the coolest water is March 7, with an average temperature of 38°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Lowell 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 Lowell for general outdoor tourist activities is from mid 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 Lowell for hot-weather activities is from early July to late August, with a peak score in the last week of July.
The growing season in Lowell typically lasts for 5.8 months (175 days), from around April 23 to around October 16, rarely starting before April 7 or after May 11, and rarely ending before September 28 or after November 4.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Lowell should appear around April 21, only rarely appearing before April 6 or after May 1.
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 21, with an average daily incident shortwave energy per square meter above 5.7 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 2 to February 10, 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 Lowell are 42.633 deg latitude, -71.316 deg longitude, and 121 ft elevation.
The topography within 2 miles of Lowell contains only modest variations in elevation, with a maximum elevation change of 253 feet and an average elevation above sea level of 119 feet. Within 10 miles contains only modest variations in elevation (558 feet). Within 50 miles contains significant variations in elevation (3,123 feet).
The area within 2 miles of Lowell is covered by artificial surfaces (100%), within 10 miles by artificial surfaces (61%) and trees (35%), and within 50 miles by trees (55%) and artificial surfaces (23%).
This report illustrates the typical weather in Lowell, 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 Lowell.
For each station, the records are corrected for the elevation difference between that station and Lowell 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 Lowell is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Lowell and a given station.
The stations contributing to this reconstruction are: Lawrence Municipal Airport (33%, 18 kilometers, northeast); Lawrence G Hanscom Field (33%, 18 kilometers, south); Boire Field (23%, 23 kilometers, northwest); and Fitchburg Municipal Airport (11%, 37 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .