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March Weather at Knox County Regional Airport Maine, United States

Daily high temperatures increase by 8°F, from 37°F to 45°F, rarely falling below 25°F or exceeding 55°F.

Daily low temperatures increase by 9°F, from 22°F to 31°F, rarely falling below 7°F or exceeding 39°F.

For reference, on July 25, the hottest day of the year, temperatures at Knox County Regional Airport typically range from 59°F to 74°F, while on January 29, the coldest day of the year, they range from 15°F to 31°F.

Average High and Low Temperature in March at Knox County Regional Airport

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 hourly average temperatures for the quarter of the year centered on March. The horizontal axis is the day, 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 March at Knox County Regional Airport

Average Hourly Temperature in March at Knox County Regional AirportMar112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMFebAprNowNowfreezingvery coldcold
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
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The month of March at Knox County Regional Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 54% throughout the month.

The clearest day of the month is March 12, with clear, mostly clear, or partly cloudy conditions 47% of the time.

For reference, on May 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 57%, while on September 2, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 64%.

Cloud Cover Categories in March at Knox County Regional Airport

Cloud Cover Categories in March at Knox County Regional AirportMar11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FebAprMar 146%Mar 146%Mar 3146%Mar 3146%Mar 1147%Mar 1147%Mar 2145%Mar 2145%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Knox County Regional Airport, the chance of a wet day over the course of March is gradually increasing, starting the month at 25% and ending it at 29%.

For reference, the year's highest daily chance of a wet day is 32% on December 10, and its lowest chance is 21% on August 29.

Over the course of March at Knox County Regional Airport, the chance of a day with only rain increases from 13% to 23%, the chance of a day with mixed snow and rain decreases from 7% to 4%, and the chance of a day with only snow decreases from 5% to 1%.

Probability of Precipitation in March at Knox County Regional Airport

Probability of Precipitation in March at Knox County Regional AirportMar11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%5%5%10%10%15%15%20%20%25%25%30%30%FebAprMar 125%Mar 125%Mar 3129%Mar 3129%Mar 1124%Mar 1124%Mar 2129%Mar 2129%NowNowsnowmixedrain
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 month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during March at Knox County Regional Airport is increasing, starting the month at 2.5 inches, when it rarely exceeds 4.8 inches or falls below 0.6 inches, and ending the month at 3.4 inches, when it rarely exceeds 5.3 inches or falls below 1.5 inches.

Average Monthly Rainfall in March at Knox County Regional Airport

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 snowfall.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during March at Knox County Regional Airport is very rapidly decreasing, starting the month at 9.5 inches, when it rarely exceeds 19.9 inches or falls below 0.5 inches, and ending the month at 4.3 inches, when it rarely exceeds 10.1 inches or falls below -0.0 inches.

Average Monthly Snowfall in March at Knox County Regional Airport

The average 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.

Over the course of March at Knox County Regional Airport, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 31 minutes, implying an average daily increase of 3 minutes, 3 seconds, and weekly increase of 21 minutes, 19 seconds.

The shortest day of the month is March 1, with 11 hours, 13 minutes of daylight and the longest day is March 31, with 12 hours, 44 minutes of daylight.

Hours of Daylight and Twilight in March at Knox County Regional Airport

Hours of Daylight and Twilight in March at Knox County Regional AirportMar11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrFebAprMar 1912 hr, 8 minMar 1912 hr, 8 minnightnightdaydayMar 111 hr, 13 minMar 111 hr, 13 minNowNow
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 of the month at Knox County Regional Airport is 5:58 AM on March 9 and the latest sunrise is 58 minutes later at 6:56 AM on March 10.

The earliest sunset is 5:25 PM on March 1 and the latest sunset is 1 hour, 38 minutes later at 7:02 PM on March 31.

Daylight saving time (DST) ends at 3:00 AM on March 10, 2024, shifting sunrise and sunset to be an hour earlier.

For reference, on June 20, the longest day of the year, the Sun rises at 4:53 AM and sets 15 hours, 30 minutes later, at 8:23 PM, while on December 21, the shortest day of the year, it rises at 7:08 AM and sets 8 hours, 53 minutes later, at 4:01 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in March at Knox County Regional Airport

Sunrise & Sunset with Twilight and Daylight Saving Time in March at Knox County Regional AirportMar112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMFebApr5:58 AM5:58 AMMar 95:35 PMMar 95:35 PM6:18 AM6:18 AMMar 317:02 PMMar 317:02 PM6:36 AM6:36 AMMar 216:50 PMMar 216:50 PMMar 10DSTMar 10DSTSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of March. 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.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in March at Knox County Regional Airport

Solar Elevation and Azimuth in March at Knox County Regional AirportMar112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMFebApr00101020202030304050000101020203030405060NowNow
northeastsouthwest
Solar elevation and azimuth over the course of March 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for March 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in March at Knox County Regional Airport

Moon Rise, Set & Phases in March at Knox County Regional AirportMar112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMFebAprFeb 96:00 PMFeb 96:00 PMFeb 247:31 AMFeb 247:31 AMMar 105:01 AMMar 105:01 AMMar 253:01 AMMar 253:01 AMApr 82:22 PMApr 82:22 PMApr 237:50 PMApr 237:50 PM6:57 AM6:57 AM4:35 PM4:35 PM4:25 PM4:25 PM6:44 AM6:44 AM7:15 AM7:15 AM7:13 PM7:13 PM6:26 PM6:26 PM6:41 AM6:41 AM5:58 AM5:58 AM7:24 PM7:24 PM7:29 PM7:29 PM5:42 AM5:42 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Mar 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
72%-8:32 AMWSW11:56 PMESE3:40 AMS247,052 mi
2
63%-9:00 AMSW-4:28 AMS244,253 mi
3
50%1:06 AMSE9:36 AMSW-5:21 AMS240,909 mi
4
41%2:14 AMSE10:24 AMSW-6:19 AMS237,151 mi
5
30%3:16 AMSE11:25 AMSW-7:21 AMS233,197 mi
6
20%4:09 AMSE12:39 PMSW-8:24 AMS229,350 mi
7
11%4:51 AMSE2:00 PMWSW-9:25 AMS225,970 mi
8
5%5:24 AMESE3:25 PMWSW-10:24 AMS223,421 mi
9
1%5:51 AMESE4:50 PMWSW-11:19 AMS221,998 mi
10
0%7:15 AME7:13 PMW-4:00 AMENE221,764 mi
11
3%7:37 AME8:35 PMW-2:02 PMS223,064 mi
12
9%7:59 AMENE9:56 PMWNW-2:53 PMS225,421 mi
13
17%8:23 AMENE11:17 PMWNW-3:44 PMS228,675 mi
14
26%8:51 AMENE--4:38 PMS232,482 mi
15
37%-12:36 AMNW9:25 AMNE5:33 PMS236,483 mi
16
48%-1:49 AMNW10:07 AMNE6:29 PMS240,359 mi
17
50%-2:54 AMNW10:59 AMNE7:25 PMS243,860 mi
18
68%-3:48 AMNW11:59 AMNE8:18 PMS246,818 mi
19
77%-4:30 AMNW1:03 PMNE9:08 PMS249,148 mi
20
85%-5:03 AMWNW2:10 PMENE9:55 PMS250,831 mi
21
91%-5:29 AMWNW3:16 PMENE10:38 PMS251,897 mi
22
96%-5:50 AMWNW4:21 PMENE11:18 PMS252,399 mi
23
99%-6:09 AMWNW5:24 PME11:57 PMS252,404 mi
24
100%-6:25 AMW6:26 PME--
25
100%-6:41 AMW7:29 PME12:36 AMS251,965 mi
26
99%-6:58 AMW8:33 PMESE1:15 AMS251,124 mi
27
97%-7:16 AMWSW9:39 PMESE1:55 AMS249,896 mi
28
92%-7:37 AMWSW10:47 PMESE2:38 AMS248,282 mi
29
86%-8:02 AMWSW11:56 PMSE3:25 AMS246,271 mi
30
78%-8:35 AMSW-4:16 AMS243,852 mi
31
68%1:04 AMSE9:18 AMSW-5:11 AMS241,043 mi

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 chance that a given day will be muggy at Knox County Regional Airport is essentially constant during March, remaining around 0% throughout.

For reference, on August 1, the muggiest day of the year, there are muggy conditions 13% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in March at Knox County Regional Airport

Humidity Comfort Levels in March at Knox County Regional AirportMar11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%FebAprMar 10%Mar 10%Mar 310%Mar 310%Mar 110%Mar 110%Mar 210%Mar 210%drydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 Knox County Regional Airport is decreasing during March, decreasing from 12.1 miles per hour to 10.5 miles per hour over the course of the month.

For reference, on January 31, the windiest day of the year, the daily average wind speed is 12.5 miles per hour, while on August 7, the calmest day of the year, the daily average wind speed is 6.3 miles per hour.

Average Wind Speed in March at Knox County Regional Airport

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction at Knox County Regional Airport throughout March is predominantly from the north, with a peak proportion of 38% on March 3.

Wind Direction in March at Knox County Regional Airport

Wind Direction in March at Knox County Regional AirportWNSMar11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%FebAprNowNowwestsouthnortheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Knox County Regional 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 surface water temperature at Knox County Regional Airport is essentially constant during March, remaining around 38°F throughout.

The lowest average surface water temperature during March is 37°F on March 11.

Average Water Temperature in March at Knox County Regional Airport

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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 Knox County Regional Airport typically lasts for 5.5 months (167 days), from around April 30 to around October 14, rarely starting before April 15 or after May 15, and rarely ending before September 28 or after October 30.

The month of March at Knox County Regional Airport is reliably fully outside of the growing season.

Time Spent in Various Temperature Bands and the Growing Season in March at Knox County Regional Airport

Time Spent in Various Temperature Bands and the Growing Season in March at Knox County Regional AirportMar11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FebApr0%Mar 160%Mar 16Apr 1510%Apr 1510%NowNowfrigidfreezingvery coldcoldcool
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 percentage of time spent in various temperature bands. 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.

The average accumulated growing degree days at Knox County Regional Airport are essentially constant during March, remaining within 2°F of 3°F throughout.

Growing Degree Days in March at Knox County Regional Airport

Growing Degree Days in March at Knox County Regional AirportMar11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310°F0°F2°F2°F4°F4°F6°F6°F8°F8°F10°F10°F12°F12°F14°F14°FFebAprMar 11°FMar 11°FMar 315°FMar 315°FMar 111°FMar 111°FMar 213°FMar 213°FNowNow
The average growing degree days accumulated over the course of March, with 25th to 75th and 10th to 90th percentile bands.

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 at Knox County Regional Airport is increasing during March, rising by 1.2 kWh, from 3.1 kWh to 4.4 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in March at Knox County Regional Airport

Average Daily Incident Shortwave Solar Energy in March at Knox County Regional AirportMar11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhFebAprMar 13.1 kWhMar 13.1 kWhMar 314.4 kWhMar 314.4 kWhMar 113.6 kWhMar 113.6 kWhMar 213.9 kWhMar 213.9 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Knox County Regional Airport are 44.061 deg latitude, -69.096 deg longitude, and 52 ft elevation.

The topography within 2 miles of Knox County Regional Airport contains only modest variations in elevation, with a maximum elevation change of 197 feet and an average elevation above sea level of 40 feet. Within 10 miles contains only modest variations in elevation (1,033 feet). Within 50 miles also contains very significant variations in elevation (1,532 feet).

The area within 2 miles of Knox County Regional Airport is covered by trees (49%), water (24%), and artificial surfaces (16%), within 10 miles by water (59%) and trees (34%), and within 50 miles by water (57%) and trees (39%).

This report illustrates the typical weather at Knox County 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

Knox County 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 Wiscasset Airport, Waterville Robert Lafleur Airport, Augusta State Airport, Bangor International Airport, Hancock County-Bar Harbor Airport, Naval Air Station Brunswick, Auburn/Lewiston Municipal Airport, and Portland International Jetport.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

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.

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