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September Weather in Cusy France

Daily high temperatures decrease by 8°F, from 72°F to 63°F, rarely falling below 55°F or exceeding 81°F.

Daily low temperatures decrease by 5°F, from 52°F to 47°F, rarely falling below 40°F or exceeding 58°F.

For reference, on August 3, the hottest day of the year, temperatures in Cusy typically range from 56°F to 77°F, while on January 15, the coldest day of the year, they range from 27°F to 38°F.

Average High and Low Temperature in September in Cusy

Average High and Low Temperature in September in CusySep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303030°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°FAugOctSep 172°FSep 172°F52°F52°FSep 3063°FSep 3063°F47°F47°FSep 1169°FSep 1169°F50°F50°FSep 2166°FSep 2166°F48°F48°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 in Cusy

Average Hourly Temperature in September in CusySep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOctvery coldcoldcoolcomfortablewarmvery cold
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.

Hope, Canada (5,152 miles away) and Banner Elk, North Carolina, United States (4,404 miles) are the far-away foreign places with temperatures most similar to Cusy (view comparison).

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The month of September in Cusy experiences rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 38% to 51%.

The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 62% of the time.

For reference, on December 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on July 21, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 70%.

Cloud Cover Categories in September in Cusy

Cloud Cover Categories in September in CusySep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctSep 162%Sep 162%Sep 3049%Sep 3049%Sep 1158%Sep 1158%Sep 2153%Sep 2153%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. In Cusy, the chance of a wet day over the course of September is gradually increasing, starting the month at 26% and ending it at 29%.

For reference, the year's highest daily chance of a wet day is 38% on May 24, and its lowest chance is 24% on March 2.

Probability of Precipitation in September in Cusy

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 in Cusy is increasing, starting the month at 2.8 inches, when it rarely exceeds 4.8 inches or falls below 0.9 inches, and ending the month at 3.3 inches, when it rarely exceeds 6.0 inches or falls below 1.1 inches.

Average Monthly Rainfall in September in Cusy

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.

Over the course of September in Cusy, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 32 minutes, implying an average daily decrease of 3 minutes, 10 seconds, and weekly decrease of 22 minutes, 12 seconds.

The shortest day of the month is September 30, with 11 hours, 44 minutes of daylight and the longest day is September 1, with 13 hours, 16 minutes of daylight.

Hours of Daylight and Twilight in September in Cusy

Hours of Daylight and Twilight in September in CusySep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 10 minSep 2212 hr, 10 minnightnightdaydaySep 113 hr, 16 minSep 113 hr, 16 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 in Cusy is 6:57 AM on September 1 and the latest sunrise is 36 minutes later at 7:33 AM on September 30.

The latest sunset is 8:13 PM on September 1 and the earliest sunset is 56 minutes earlier at 7:17 PM on September 30.

Daylight saving time is observed in Cusy 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 5:45 AM and sets 15 hours, 43 minutes later, at 9:29 PM, while on December 21, the shortest day of the year, it rises at 8:14 AM and sets 8 hours, 40 minutes later, at 4:54 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in September in Cusy

Sunrise & Sunset with Twilight and Daylight Saving Time in September in CusySep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMAugOct6:57 AM6:57 AMSep 18:13 PMSep 18:13 PM7:33 AM7:33 AMSep 307:17 PMSep 307:17 PM7:09 AM7:09 AMSep 117:54 PMSep 117:54 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 in Cusy

Solar Elevation and Azimuth in September in CusySep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOct0010102020303040405000101020203030405060
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 in Cusy

Moon Rise, Set & Phases in September in CusySep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctAug 41:14 PMAug 41:14 PMAug 198:26 PMAug 198:26 PMSep 33:56 AMSep 33:56 AMSep 184:35 AMSep 184:35 AMOct 28:50 PMOct 28:50 PMOct 171:27 PMOct 171:27 PM5:53 AM5:53 AM9:28 PM9:28 PM8:50 PM8:50 PM7:13 AM7:13 AM7:07 AM7:07 AM8:28 PM8:28 PM7:35 PM7:35 PM7:30 AM7:30 AM7:07 AM7:07 AM7:05 PM7:05 PM6:37 PM6:37 PM9:12 AM9:12 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
3%4:52 AMENE7:55 PMWNW-12:28 PMS248,766 mi
2
0%6:00 AMENE8:13 PMWNW-1:11 PMS250,249 mi
3
0%7:07 AMENE8:28 PMW-1:51 PMS251,380 mi
4
2%8:11 AME8:43 PMW-2:30 PMS252,118 mi
5
5%9:15 AME8:58 PMW-3:08 PMS252,405 mi
6
11%10:19 AMESE9:13 PMWSW-3:47 PMS252,168 mi
7
17%11:24 AMESE9:31 PMWSW-4:28 PMS251,331 mi
8
25%12:32 PMESE9:52 PMWSW-5:12 PMS249,831 mi
9
35%1:40 PMSE10:19 PMSW-6:00 PMS247,635 mi
10
45%2:49 PMSE10:54 PMSW-6:52 PMS244,761 mi
11
50%3:55 PMSE11:41 PMSW-7:48 PMS241,295 mi
12
66%4:53 PMSE--8:48 PMS237,404 mi
13
76%-12:42 AMSW5:41 PMSE9:48 PMS233,347 mi
14
85%-1:55 AMSW6:19 PMSE10:47 PMS229,449 mi
15
93%-3:16 AMWSW6:49 PMESE11:44 PMS226,077 mi
16
96%-4:40 AMWSW7:13 PMESE--
17
98%-6:05 AMWSW7:35 PME12:38 AMS223,575 mi
18
100%-7:30 AMW7:54 PME1:30 AMS222,213 mi
19
99%-8:54 AMW8:15 PMENE2:21 AMS222,132 mi
20
94%-10:19 AMWNW8:37 PMENE3:12 AMS223,321 mi
21
87%-11:45 AMWNW9:05 PMENE4:05 AMS225,615 mi
22
78%-1:08 PMNW9:39 PMNE5:00 AMS228,740 mi
23
67%-2:26 PMNW10:23 PMNE5:58 AMS232,361 mi
24
50%-3:33 PMNW11:18 PMNE6:57 AMS236,144 mi
25
45%-4:27 PMNW-7:54 AMS239,803 mi
26
35%12:22 AMNE5:07 PMNW-8:49 AMS243,125 mi
27
25%1:32 AMNE5:38 PMWNW-9:40 AMS245,982 mi
28
17%2:42 AMENE6:01 PMWNW-10:27 AMS248,313 mi
29
10%3:51 AMENE6:20 PMWNW-11:10 AMS250,110 mi
30
5%4:58 AMENE6:36 PMW-11:51 AMS251,397 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 in Cusy is essentially constant during September, remaining around 0% throughout.

For reference, on July 24, the muggiest day of the year, there are muggy conditions 2% of the time, while on September 29, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in September in Cusy

Humidity Comfort Levels in September in CusySep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOctSep 11%Sep 11%Sep 300%Sep 300%Sep 110%Sep 110%Sep 210%Sep 210%humidhumidcomfortablecomfortabledrydry
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 in Cusy is essentially constant during September, remaining around 4.5 miles per hour throughout.

For reference, on April 2, the windiest day of the year, the daily average wind speed is 5.1 miles per hour, while on August 11, the calmest day of the year, the daily average wind speed is 4.3 miles per hour.

Average Wind Speed in September in Cusy

Average Wind Speed in September in CusySep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mphAugOctSep 14.5 mphSep 14.5 mphSep 304.5 mphSep 304.5 mphSep 114.5 mphSep 114.5 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction in Cusy during September is predominantly out of the north from September 1 to September 16 and the south from September 16 to September 30.

Wind Direction in September in Cusy

Wind Direction in September in CusyNSSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%AugOctwestsouthnortheast
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).

The growing season in Cusy typically lasts for 6.4 months (197 days), from around April 15 to around October 29, rarely starting before March 29 or after May 6, and rarely ending before October 10 or after November 18.

The month of September in Cusy is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in September in Cusy

Time Spent in Various Temperature Bands and the Growing Season in September in Cusygrowing seasonSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOct100%Sep 16100%Sep 1650%Oct 2950%Oct 2990%Oct 1090%Oct 10Aug 2100%Aug 2100%very coldcoldcoolcomfortablewarmfreezing
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 in Cusy are increasing during September, increasing by 255°F, from 1,677°F to 1,931°F, over the course of the month.

Growing Degree Days in September in Cusy

Growing Degree Days in September in CusySep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930301,400°F1,400°F1,500°F1,500°F1,600°F1,600°F1,700°F1,700°F1,800°F1,800°F1,900°F1,900°F2,000°F2,000°F2,100°F2,100°F2,200°F2,200°FAugOctSep 11,677°FSep 11,677°FSep 301,931°FSep 301,931°FSep 111,784°FSep 111,784°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 in Cusy is rapidly decreasing during September, falling by 1.6 kWh, from 5.4 kWh to 3.8 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in September in Cusy

Average Daily Incident Shortwave Solar Energy in September in CusySep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhAugOctSep 15.4 kWhSep 15.4 kWhSep 303.8 kWhSep 303.8 kWhSep 114.9 kWhSep 114.9 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.

For the purposes of this report, the geographical coordinates of Cusy are 45.766 deg latitude, 6.027 deg longitude, and 1,827 ft elevation.

The topography within 2 miles of Cusy contains large variations in elevation, with a maximum elevation change of 3,025 feet and an average elevation above sea level of 2,105 feet. Within 10 miles contains large variations in elevation (6,335 feet). Within 50 miles also contains extreme variations in elevation (15,154 feet).

The area within 2 miles of Cusy is covered by cropland (50%), trees (36%), and grassland (10%), within 10 miles by trees (44%) and cropland (21%), and within 50 miles by trees (40%) and cropland (20%).

This report illustrates the typical weather in Cusy, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Cusy.

For each station, the records are corrected for the elevation difference between that station and Cusy 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 Cusy is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Cusy and a given station.

The stations contributing to this reconstruction are:

  • Chambéry Airport (LFLB, 27%, 11 mi, southwest, -1,050 ft elevation change)
  • Annecy-Meythet (LFLP, 62%, 12 mi, north, -308 ft elevation change)
  • Ambérieu (LFXA, 11%, 37 mi, northwest, -1,007 ft elevation change)

To get a sense of how much these sources agree with each other, you can view a comparison of Cusy and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

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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