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September Weather at Henderickson Automatic Weather Reporting System Canada

Daily high temperatures decrease by 9°F, from 61°F to 52°F, rarely falling below 39°F or exceeding 73°F.

Daily low temperatures decrease by 7°F, from 34°F to 26°F, rarely falling below 17°F or exceeding 41°F.

For reference, on August 4, the hottest day of the year, temperatures at Henderickson Automatic Weather Reporting System typically range from 39°F to 67°F, while on January 1, the coldest day of the year, they range from 1°F to 22°F.

Average High and Low Temperature in September at Henderickson Automatic Weather Reporting System

Average High and Low Temperature in September at Henderickson Automatic Weather Reporting SystemSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°FAugOctSep 161°FSep 161°F34°F34°FSep 3052°FSep 3052°F26°F26°FSep 1158°FSep 1158°F31°F31°FSep 2155°FSep 2155°F29°F29°F
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 September. 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 September at Henderickson Automatic Weather Reporting System

Average Hourly Temperature in September at Henderickson Automatic Weather Reporting SystemSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOctfreezingfreezingvery coldcoldcoolcold
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.

Kurush, Russia (5,824 miles away) is the far-away foreign place with temperatures most similar to Henderickson Automatic Weather Reporting System (view comparison).

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The month of September at Henderickson Automatic Weather Reporting System experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 53% throughout the month.

The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 49% of the time.

For reference, on February 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 68%, while on August 2, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 56%.

Cloud Cover Categories in September at Henderickson Automatic Weather Reporting System

Cloud Cover Categories in September at Henderickson Automatic Weather Reporting SystemSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctSep 149%Sep 149%Sep 3045%Sep 3045%Sep 1147%Sep 1147%Sep 2147%Sep 2147%clearmostly 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 Henderickson Automatic Weather Reporting System, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 26% and ending it at 18%.

For reference, the year's highest daily chance of a wet day is 43% on June 21, and its lowest chance is 8% on February 15.

Over the course of September at Henderickson Automatic Weather Reporting System, the chance of a day with only rain decreases from 23% to 9%, the chance of a day with mixed snow and rain increases from 2% to 6%, and the chance of a day with only snow increases from 1% to 3%.

Probability of Precipitation in September at Henderickson Automatic Weather Reporting System

Probability of Precipitation in September at Henderickson Automatic Weather Reporting SystemSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%AugOctSep 126%Sep 126%Sep 3018%Sep 3018%Sep 1125%Sep 1125%Sep 2120%Sep 2120%snowmixedrain
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 September at Henderickson Automatic Weather Reporting System is decreasing, starting the month at 1.7 inches, when it rarely exceeds 3.0 inches or falls below 0.6 inches, and ending the month at 0.7 inches, when it rarely exceeds 1.3 inches or falls below 0.3 inches.

Average Monthly Rainfall in September at Henderickson Automatic Weather Reporting System

Average Monthly Rainfall in September at Henderickson Automatic Weather Reporting SystemSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 inAugOctSep 11.7 inSep 11.7 inSep 300.7 inSep 300.7 inSep 111.3 inSep 111.3 inSep 211.0 inSep 211.0 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 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 September at Henderickson Automatic Weather Reporting System is increasing, starting the month at 1.3 inches, when it rarely exceeds 3.7 inches or falls below -0.0 inches, and ending the month at 3.3 inches, when it rarely exceeds 7.2 inches or falls below 0.2 inches.

Average Monthly Snowfall in September at Henderickson Automatic Weather Reporting System

Average Monthly Snowfall in September at Henderickson Automatic Weather Reporting SystemSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 inAugOctSep 11.3 inSep 11.3 inSep 303.3 inSep 303.3 inSep 112.1 inSep 112.1 inSep 212.7 inSep 212.7 in
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 September at Henderickson Automatic Weather Reporting System, the length of the day is very rapidly decreasing. From the start to the end of the month, the length of the day decreases by 2 hours, 3 minutes, implying an average daily decrease of 4 minutes, 14 seconds, and weekly decrease of 29 minutes, 36 seconds.

The shortest day of the month is September 30, with 11 hours, 36 minutes of daylight and the longest day is September 1, with 13 hours, 39 minutes of daylight.

Hours of Daylight and Twilight in September at Henderickson Automatic Weather Reporting System

Hours of Daylight and Twilight in September at Henderickson Automatic Weather Reporting SystemSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 14 minSep 2212 hr, 14 minnightnightdaydaySep 113 hr, 39 minSep 113 hr, 39 min
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 Henderickson Automatic Weather Reporting System is 7:03 AM on September 1 and the latest sunrise is 51 minutes later at 7:55 AM on September 30.

The latest sunset is 8:42 PM on September 1 and the earliest sunset is 1 hour, 11 minutes earlier at 7:30 PM on September 30.

Daylight saving time is observed at Henderickson Automatic Weather Reporting System during 2024, but it neither starts nor ends during September, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:22 AM and sets 17 hours, 6 minutes later, at 10:28 PM, while on December 21, the shortest day of the year, it rises at 9:09 AM and sets 7 hours, 25 minutes later, at 4:34 PM.

Sunrise & Sunset with Twilight in September at Henderickson Automatic Weather Reporting System

Sunrise & Sunset with Twilight in September at Henderickson Automatic Weather Reporting SystemSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMAugOct7:03 AM7:03 AMSep 18:42 PMSep 18:42 PM7:55 AM7:55 AMSep 307:30 PMSep 307:30 PM7:21 AM7:21 AMSep 118:17 PMSep 118:17 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of September. 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 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 September at Henderickson Automatic Weather Reporting System

Solar Elevation and Azimuth in September at Henderickson Automatic Weather Reporting SystemSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOct00101020202030405000010102020303040
northeastsouthwest
Solar elevation and azimuth over the course of September 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 September 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 September at Henderickson Automatic Weather Reporting System

Moon Rise, Set & Phases in September at Henderickson Automatic Weather Reporting SystemSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctAug 45:14 AMAug 45:14 AMAug 1912:26 PMAug 1912:26 PMSep 27:56 PMSep 27:56 PMSep 178:35 PMSep 178:35 PMOct 212:50 PMOct 212:50 PMOct 175:27 AMOct 175:27 AM6:00 AM6:00 AM10:21 PM10:21 PM9:21 PM9:21 PM6:08 AM6:08 AM6:23 AM6:23 AM8:49 PM8:49 PM8:03 PM8:03 PM8:18 AM8:18 AM7:51 AM7:51 AM7:20 PM7:20 PM6:29 PM6:29 PM8:51 AM8:51 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.
Sep 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
2%5:05 AMENE8:41 PMWNW-1:00 PMS249,316 mi
2
0%6:23 AMENE8:49 PMWNW-1:42 PMS250,680 mi
3
1%7:37 AMENE8:56 PMW-2:21 PMS251,681 mi
4
3%8:50 AME9:03 PMW-3:00 PMS252,272 mi
5
7%10:02 AME9:10 PMWSW-3:38 PMS252,387 mi
6
13%11:15 AMESE9:18 PMWSW-4:18 PMS251,951 mi
7
20%12:30 PMESE9:28 PMWSW-5:00 PMS250,891 mi
8
28%1:48 PMSE9:41 PMSW-5:45 PMS249,152 mi
9
38%3:07 PMSE10:01 PMSW-6:34 PMS246,717 mi
10
48%4:24 PMSE10:32 PMSW-7:28 PMS243,624 mi
11
50%5:33 PMSE11:20 PMSW-8:26 PMS239,987 mi
12
69%6:25 PMSE--9:27 PMS236,004 mi
13
79%-12:28 AMSW7:01 PMSE10:27 PMS231,961 mi
14
88%-1:54 AMSW7:25 PMSE11:26 PMS228,203 mi
15
92%-3:29 AMSW7:41 PMESE--
16
95%-5:06 AMWSW7:53 PMESE12:22 AMS225,095 mi
17
100%-6:43 AMWSW8:03 PME1:16 AMS222,963 mi
18
100%-8:18 AMW8:13 PME2:07 AMS222,037 mi
19
98%-9:54 AMWNW8:23 PMENE2:58 AMS222,406 mi
20
92%-11:31 AMWNW8:36 PMENE3:49 AMS224,003 mi
21
84%-1:09 PMNW8:54 PMNE4:43 AMS226,621 mi
22
74%-2:43 PMNW9:21 PMNE5:39 AMS229,956 mi
23
64%-4:06 PMNW10:01 PMNE6:36 AMS233,668 mi
24
50%-5:10 PMNW10:59 PMNE7:35 AMS237,436 mi
25
41%-5:53 PMNW-8:31 AMS240,997 mi
26
31%12:12 AMNE6:20 PMNW-9:25 AMS244,168 mi
27
22%1:32 AMNE6:38 PMNW-10:14 AMS246,847 mi
28
14%2:53 AMNE6:50 PMWNW-10:59 AMS248,992 mi
29
8%4:11 AMENE6:59 PMWNW-11:41 AMS250,610 mi
30
4%5:26 AMENE7:07 PMW-12:21 PMS251,729 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 Henderickson Automatic Weather Reporting System is essentially constant during September, remaining around 0% throughout.

Humidity Comfort Levels in September at Henderickson Automatic Weather Reporting System

Humidity Comfort Levels in September at Henderickson Automatic Weather Reporting SystemSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOctSep 160%Sep 160%Sep 10%Sep 10%Sep 300%Sep 300%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 Henderickson Automatic Weather Reporting System is gradually increasing during September, increasing from 4.3 miles per hour to 4.9 miles per hour over the course of the month.

For reference, on December 10, the windiest day of the year, the daily average wind speed is 6.2 miles per hour, while on August 2, the calmest day of the year, the daily average wind speed is 4.0 miles per hour.

Average Wind Speed in September at Henderickson Automatic Weather Reporting System

Average Wind Speed in September at Henderickson Automatic Weather Reporting SystemSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mphAugOctSep 14.3 mphSep 14.3 mphSep 304.9 mphSep 304.9 mphSep 114.6 mphSep 114.6 mph
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 Henderickson Automatic Weather Reporting System throughout September is predominantly from the west, with a peak proportion of 60% on September 1.

Wind Direction in September at Henderickson Automatic Weather Reporting System

Wind Direction in September at Henderickson Automatic Weather Reporting SystemSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%AugOctwestsoutheastnorth
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).

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).

Temperatures at Henderickson Automatic Weather Reporting System are sufficiently cold year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in September at Henderickson Automatic Weather Reporting System

Time Spent in Various Temperature Bands and the Growing Season in September at Henderickson Automatic Weather Reporting SystemSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctSep 17%Sep 17%Sep 30-0%Sep 30-0%Sep 111%Sep 111%Sep 210%Sep 210%frigidfreezingvery coldcoldcoolcomfortable
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 Henderickson Automatic Weather Reporting System are gradually increasing during September, increasing by 63°F, from 500°F to 563°F, over the course of the month.

Growing Degree Days in September at Henderickson Automatic Weather Reporting System

Growing Degree Days in September at Henderickson Automatic Weather Reporting SystemSep112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030400°F400°F450°F450°F500°F500°F550°F550°F600°F600°F650°F650°FAugOctSep 1500°FSep 1500°FSep 30563°FSep 30563°FSep 11529°FSep 11529°FSep 21549°FSep 21549°F
The average growing degree days accumulated over the course of September, 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 Henderickson Automatic Weather Reporting System is decreasing during September, falling by 1.5 kWh, from 4.5 kWh to 3.0 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in September at Henderickson Automatic Weather Reporting System

Average Daily Incident Shortwave Solar Energy in September at Henderickson Automatic Weather Reporting SystemSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhAugOctSep 14.5 kWhSep 14.5 kWhSep 303.0 kWhSep 303.0 kWhSep 114.0 kWhSep 114.0 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.

This report illustrates the typical weather at Henderickson Automatic Weather Reporting System, 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

Henderickson Automatic Weather Reporting System 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 are Willow Creek, Jasper Warden Automated Reporting Station, Blue River Marine Aviation Reporting Station, Blue River Airport, Edson Climate, and Edson 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 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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