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Average Weather at Northern Aroostook Regional Airport Maine, United States

At Northern Aroostook Regional Airport, the summers are comfortable, wet, and partly cloudy and the winters are frigid, snowy, and mostly cloudy. Over the course of the year, the temperature typically varies from 3°F to 74°F and is rarely below -14°F or above 82°F.

Climate Summary

freezingcoldcoolcomfortablecoolcoldfreezingJanFebMarAprMayJunJulAugSepOctNovDec60%60%27%27%overcastclearprecipitation: 3.8 inprecipitation: 3.8 in1.6 in1.6 inmuggy: 7%muggy: 7%0%0%drydrytourism score: 6.1tourism score: 6.10.00.0
Click on each chart for more information.

Based on the tourism score, the best time of year to visit Northern Aroostook Regional Airport for warm-weather activities is from early July to late August.

Temperature

The warm season lasts for 3.8 months, from May 25 to September 17, with an average daily high temperature above 63°F. The hottest day of the year is July 27, with an average high of 74°F and low of 57°F.

The cold season lasts for 3.3 months, from December 2 to March 11, with an average daily high temperature below 29°F. The coldest day of the year is January 29, with an average low of 3°F and high of 19°F.

Average High and Low Temperature

Average High and Low Temperature at Northern Aroostook Regional AirportwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-20°F-10°F0°F10°F20°F30°F40°F50°F60°F70°F80°F90°F100°FJan 2919°FJan 2919°FJul 2774°FJul 2774°F3°F3°F57°F57°FMay 2563°FMay 2563°FSep 1763°FSep 1763°FDec 229°FDec 229°FMar 1129°FMar 1129°F44°F44°F47°F47°F18°F18°F13°F13°FLowHigh
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

Average Hourly Temperature at Northern Aroostook Regional AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfrigidfreezingfreezingvery coldcoldcoldcoolcomfortablevery coldfrigidfrigid
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Madina, Armenia (5,160 miles away) and Kazan, Russia (4,455 miles) are the far-away foreign places with temperatures most similar to Northern Aroostook Regional Airport (view comparison).

Clouds

At Northern Aroostook Regional Airport, 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 at Northern Aroostook Regional Airport begins around June 5 and lasts for 5.0 months, ending around November 4. On August 21, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 60% of the time, and overcast or mostly cloudy 40% of the time.

The cloudier part of the year begins around November 4 and lasts for 7.0 months, ending around June 5. On January 11, the cloudiest day of the year, the sky is overcast or mostly cloudy 73% of the time, and clear, mostly clear, or partly cloudy 27% of the time.

Cloud Cover Categories

Cloud Cover Categories at Northern Aroostook Regional AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 2160%Aug 2160%Jan 1127%Jan 1127%Jun 543%Jun 543%Nov 444%Nov 444%clearmostly clearpartly cloudymostly cloudyovercast
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Northern Aroostook Regional Airport varies throughout the year.

The wetter season lasts 4.4 months, from May 13 to September 25, with a greater than 33% chance of a given day being a wet day. The chance of a wet day peaks at 46% on July 12.

The drier season lasts 7.6 months, from September 25 to May 13. The smallest chance of a wet day is 20% on February 4.

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 at Northern Aroostook Regional Airport changes throughout the year.

Rain alone is the most common for 8.0 months, from March 25 to November 24. The highest chance of a day with rain alone is 46% on July 12.

Snow alone is the most common for 4.0 months, from November 24 to March 25. The highest chance of a day with snow alone is 19% on December 30.

Daily Chance of Precipitation

Daily Chance of Precipitation at Northern Aroostook Regional AirportsnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 1246%Jul 1246%Feb 420%Feb 420%Mar 2525%Mar 2525%Nov 2429%Nov 2429%May 1333%May 1333%Sep 2533%Sep 2533%snowrainmixed
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

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. Northern Aroostook Regional Airport experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 10 months, from March 9 to January 18, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around July 9, with an average total accumulation of 3.8 inches.

The rainless period of the year lasts for 1.7 months, from January 18 to March 9. The least rain falls around February 16, with an average total accumulation of 0.3 inches.

Average Monthly Rainfall

Average Monthly Rainfall at Northern Aroostook Regional AirportrainJanFebMarAprMayJunJulAugSepOctNovDec0 in1 in2 in3 in4 in5 in6 in7 inJul 93.8 inJul 93.8 inFeb 160.3 inFeb 160.3 inSep 283.1 inSep 283.1 inJan 180.5 inJan 180.5 in
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Snowfall

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. Northern Aroostook Regional Airport experiences significant seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 6.8 months, from October 14 to May 7, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around March 1, with an average total liquid-equivalent accumulation of 1.4 inches.

The snowless period of the year lasts for 5.2 months, from May 7 to October 14. The least snow falls around July 27, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Northern Aroostook Regional AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 in2.5 in3.0 in3.5 in4.0 inMar 11.4 inMar 11.4 inJul 270.0 inJul 270.0 inDec 231.4 inDec 231.4 inJan 251.3 inJan 251.3 inOct 140.1 inOct 140.1 inMay 70.1 inMay 70.1 in
The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Sun

The length of the day at Northern Aroostook Regional Airport varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 28 minutes of daylight; the longest day is June 21, with 15 hours, 56 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Northern Aroostook Regional AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2015 hr, 56 minJun 2115 hr, 56 minJun 2112 hr, 10 minSep 2212 hr, 10 minSep 228 hr, 28 minDec 218 hr, 28 minDec 21nightnightday
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 4:36 AM on June 16, and the latest sunrise is 2 hours, 45 minutes later at 7:21 AM on November 4. The earliest sunset is at 3:42 PM on December 11, and the latest sunset is 4 hours, 51 minutes later at 8:33 PM on June 25.

Daylight saving time (DST) is observed at Northern Aroostook Regional Airport 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

Sunrise & Sunset with Twilight and Daylight Saving Time at Northern Aroostook Regional AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 164:36 AMJun 164:36 AM8:33 PMJun 258:33 PMJun 25Dec 113:42 PMDec 113:42 PM7:21 AMNov 47:21 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Humidity

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.

The perceived humidity level at Northern Aroostook Regional Airport, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 4% of 4% throughout.

Humidity Comfort Levels

Humidity Comfort Levels at Northern Aroostook Regional AirportJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Mar 60%Mar 60%Jul 177%Jul 177%humidhumiddrydrycomfortablecomfortablemuggymuggy
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 at Northern Aroostook Regional Airport experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.8 months, from November 11 to May 3, with average wind speeds of more than 6.1 miles per hour. The windiest day of the year is February 26, with an average hourly wind speed of 7.7 miles per hour.

The calmer time of year lasts for 6.2 months, from May 3 to November 11. The calmest day of the year is August 1, with an average hourly wind speed of 4.4 miles per hour.

Average Wind Speed

Average Wind Speed at Northern Aroostook Regional AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mph11 mph12 mphFeb 267.7 mphFeb 267.7 mphAug 14.4 mphAug 14.4 mphNov 116.1 mphNov 116.1 mphMay 36.1 mphMay 36.1 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Northern Aroostook Regional Airport varies throughout the year.

The wind is most often from the north for 1.1 months, from April 7 to May 11, with a peak percentage of 33% on April 13. The wind is most often from the south for 1.7 weeks, from May 11 to May 23, with a peak percentage of 29% on May 17. The wind is most often from the west for 10 months, from May 23 to April 7, with a peak percentage of 48% on January 1.

Wind Direction

Wind Direction at Northern Aroostook Regional AirportWNSWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsouthnortheast
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is at Northern Aroostook Regional 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 Northern Aroostook Regional Airport for general outdoor tourist activities is from early July to late August, with a peak score in the last week of July.

Tourism Score

Tourism Score at Northern Aroostook Regional Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.16.10.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Northern Aroostook Regional Airport for hot-weather activities is from mid July to mid August, with a peak score in the last week of July.

Beach/Pool Score

Beach/Pool Score at Northern Aroostook Regional AirportJanFebMarAprMayJunJulAugSepOctNovDec02468103.03.00.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

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.

Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season at Northern Aroostook Regional Airport typically lasts for 4.8 months (146 days), from around May 10 to around October 3, rarely starting before April 24 or after May 26, and rarely ending before September 16 or after October 22.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Northern Aroostook Regional Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 1050%May 1050%Oct 350%Oct 350%May 2690%May 2690%Sep 1690%Sep 1690%Apr 2410%Apr 2410%Oct 2210%Oct 2210%0%Dec 80%Dec 8Jul 22100%Jul 22100%frigidfreezingcoolcomfortablecoldwarmvery cold
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms at Northern Aroostook Regional Airport should appear around May 19, only rarely appearing before May 9 or after May 30.

Growing Degree Days

Growing Degree Days at Northern Aroostook Regional AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F200°F400°F600°F800°F1,000°F1,200°F1,400°F1,600°F1,800°FMay 1990°FMay 1990°FJul 29900°FJul 29900°FDec 311,609°FDec 311,609°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 3.6 months, from May 5 to August 24, with an average daily incident shortwave energy per square meter above 5.2 kWh. The brightest day of the year is July 4, with an average of 6.3 kWh.

The darker period of the year lasts for 3.5 months, from October 27 to February 12, with an average daily incident shortwave energy per square meter below 2.1 kWh. The darkest day of the year is December 17, with an average of 1.1 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Northern Aroostook Regional AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJul 46.3 kWhJul 46.3 kWhDec 171.1 kWhDec 171.1 kWhMay 55.2 kWhMay 55.2 kWhAug 245.2 kWhAug 245.2 kWhOct 272.1 kWhOct 272.1 kWhFeb 122.1 kWhFeb 122.1 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Northern Aroostook Regional Airport are 47.285 deg latitude, -68.312 deg longitude, and 797 ft elevation.

The topography within 2 miles of Northern Aroostook Regional Airport contains significant variations in elevation, with a maximum elevation change of 594 feet and an average elevation above sea level of 817 feet. Within 10 miles contains significant variations in elevation (1,073 feet). Within 50 miles also contains very significant variations in elevation (1,900 feet).

The area within 2 miles of Northern Aroostook Regional Airport is covered by trees (70%) and cropland (24%), within 10 miles by trees (66%) and cropland (22%), and within 50 miles by trees (87%).

Data Sources

This report illustrates the typical weather at Northern Aroostook Regional 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

Northern Aroostook Regional 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 Edmundston Airport; Saint-Léonard Airport; Caribou Municipal Airport; St Leonard Automatic Weather Reporting System; Loring Air Force Base / Limeston; Northern Maine Regional Airport at Presque Isle; Ile Bicquette, Que.; and Houlton International Airport.

Other Data

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.

Disclaimer

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.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.