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October Weather in Perroy Switzerland

Daily high temperatures decrease by 11°F, from 64°F to 53°F, rarely falling below 45°F or exceeding 72°F.

Daily low temperatures decrease by 8°F, from 50°F to 42°F, rarely falling below 34°F or exceeding 56°F.

For reference, on August 3, the hottest day of the year, temperatures in Perroy typically range from 60°F to 78°F, while on January 15, the coldest day of the year, they range from 30°F to 39°F.

Average High and Low Temperature in October in Perroy

Average High and Low Temperature in October in PerroyOct112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313125°F25°F30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°FSepNovOct 164°FOct 164°F50°F50°FOct 3153°FOct 3153°F42°F42°FOct 1160°FOct 1160°F47°F47°FOct 2157°FOct 2157°F45°F45°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 October. 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 October in Perroy

Average Hourly Temperature in October in PerroyOct112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMSepNovvery 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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Coquitlam, Canada (5,158 miles away) and Boone, North Carolina, United States (4,387 miles) are the far-away foreign places with temperatures most similar to Perroy (view comparison).

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The month of October in Perroy experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 52% to 56%.

The clearest day of the month is October 1, with clear, mostly clear, or partly cloudy conditions 48% of the time.

For reference, on November 23, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on July 22, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.

Cloud Cover Categories in October in Perroy

Cloud Cover Categories in October in PerroyOct11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SepNovOct 148%Oct 148%Oct 3144%Oct 3144%Oct 1146%Oct 1146%Oct 2144%Oct 2144%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 Perroy, the chance of a wet day over the course of October is essentially constant, remaining around 32% throughout.

For reference, the year's highest daily chance of a wet day is 42% on May 24, and its lowest chance is 26% on March 2.

Probability of Precipitation in October in Perroy

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 October in Perroy is essentially constant, remaining about 3.6 inches throughout, and rarely exceeding 6.4 inches or falling below 1.1 inches.

The highest average 31-day accumulation is 3.6 inches on October 7.

Average Monthly Rainfall in October in Perroy

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 October in Perroy, 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, 35 minutes, implying an average daily decrease of 3 minutes, 10 seconds, and weekly decrease of 22 minutes, 7 seconds.

The shortest day of the month is October 31, with 10 hours, 5 minutes of daylight and the longest day is October 1, with 11 hours, 40 minutes of daylight.

Hours of Daylight and Twilight in October in Perroy

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 latest sunrise of the month in Perroy is 8:07 AM on October 26 and the earliest sunrise is 59 minutes earlier at 7:09 AM on October 27.

The latest sunset is 7:13 PM on October 1 and the earliest sunset is 1 hour, 53 minutes earlier at 5:20 PM on October 31.

Daylight saving time (DST) starts at 2:00 AM on October 27, 2024, shifting sunrise and sunset to be an hour later.

For reference, on June 20, the longest day of the year, the Sun rises at 5:41 AM and sets 15 hours, 49 minutes later, at 9:30 PM, while on December 21, the shortest day of the year, it rises at 8:15 AM and sets 8 hours, 35 minutes later, at 4:50 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in October in Perroy

Sunrise & Sunset with Twilight and Daylight Saving Time in October in PerroyOct11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSepNov7:09 AM7:09 AMOct 275:26 PMOct 275:26 PM7:33 AM7:33 AMOct 17:13 PMOct 17:13 PM7:46 AM7:46 AMOct 116:54 PMOct 116:54 PMDSTOct 27DSTOct 27SolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of October. 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 October in Perroy

Solar Elevation and Azimuth in October in PerroyOct112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMSepNov00102020203040500001010203030
northeastsouthwest
Solar elevation and azimuth over the course of October 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 October 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 October in Perroy

Moon Rise, Set & Phases in October in PerroyOct112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSepNovSep 33:56 AMSep 33:56 AMSep 184:35 AMSep 184:35 AMOct 28:50 PMOct 28:50 PMOct 171:27 PMOct 171:27 PMNov 11:48 PMNov 11:48 PMNov 1510:29 PMNov 1510:29 PM7:05 AM7:05 AM8:28 PM8:28 PM7:34 PM7:34 PM7:28 AM7:28 AM7:05 AM7:05 AM7:04 PM7:04 PM6:34 PM6:34 PM9:12 AM9:12 AM7:13 AM7:13 AM4:59 PM4:59 PM4:23 PM4:23 PM8:32 AM8:32 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.
Oct 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
2%6:01 AME6:50 PMW-12:28 PMS252,207 mi
2
0%7:05 AME7:04 PMW-1:06 PMS252,572 mi
3
0%8:10 AME7:18 PMWSW-1:45 PMS252,506 mi
4
3%9:15 AMESE7:34 PMWSW-2:26 PMS252,005 mi
5
7%10:23 AMESE7:53 PMWSW-3:08 PMS251,044 mi
6
13%11:32 AMESE8:17 PMSW-3:55 PMS249,586 mi
7
20%12:41 PMSE8:49 PMSW-4:45 PMS247,597 mi
8
29%1:48 PMSE9:30 PMSW-5:39 PMS245,062 mi
9
39%2:48 PMSE10:24 PMSW-6:36 PMS242,008 mi
10
50%3:38 PMSE11:31 PMSW-7:34 PMS238,523 mi
11
61%4:18 PMSE--8:32 PMS234,772 mi
12
72%-12:47 AMSW4:49 PMESE9:28 PMS230,996 mi
13
82%-2:08 AMWSW5:14 PMESE10:22 PMS227,502 mi
14
90%-3:31 AMWSW5:35 PMESE11:13 PMS224,627 mi
15
94%-4:55 AMW5:54 PME--
16
96%-6:19 AMW6:13 PME12:04 AMS222,691 mi
17
100%-7:45 AMWNW6:34 PMENE12:55 AMS221,941 mi
18
100%-9:12 AMWNW6:58 PMENE1:47 AMS222,494 mi
19
96%-10:41 AMWNW7:29 PMNE2:43 AMS224,311 mi
20
90%-12:06 PMNW8:09 PMNE3:41 AMS227,198 mi
21
82%-1:21 PMNW9:01 PMNE4:42 AMS230,840 mi
22
72%-2:22 PMNW10:04 PMNE5:42 AMS234,865 mi
23
62%-3:08 PMNW11:15 PMNE6:40 AMS238,907 mi
24
50%-3:42 PMNW-7:34 AMS242,662 mi
25
41%12:27 AMENE4:07 PMWNW-8:23 AMS245,913 mi
26
31%1:38 AMENE4:27 PMWNW-9:07 AMS248,528 mi
27
22%2:46 AME3:43 PMWNW-8:49 AMS250,453 mi
28
15%2:52 AME3:58 PMW-9:28 AMS251,692 mi
29
9%3:57 AME4:11 PMW-10:06 AMS252,293 mi
30
4%5:01 AME4:26 PMW-10:45 AMS252,328 mi
31
1%6:06 AMESE4:41 PMWSW-11:25 AMS251,874 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 Perroy is essentially constant during October, remaining around 0% throughout.

For reference, on August 9, the muggiest day of the year, there are muggy conditions 1% 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 October in Perroy

Humidity Comfort Levels in October in PerroyOct11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SepNovOct 10%Oct 10%Oct 310%Oct 310%Oct 110%Oct 110%Oct 210%Oct 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 Perroy is essentially constant during October, remaining within 0.2 miles per hour of 6.5 miles per hour throughout.

For reference, on April 2, the windiest day of the year, the daily average wind speed is 7.6 miles per hour, while on August 9, the calmest day of the year, the daily average wind speed is 6.1 miles per hour.

The lowest daily average wind speed during October is 6.3 miles per hour on October 2.

Average Wind Speed in October in Perroy

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 in Perroy throughout October is predominantly from the south, with a peak proportion of 43% on October 28.

Wind Direction in October in Perroy

Wind Direction in October in PerroyWSOct11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%SepNovwestsouthnortheast
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 Perroy typically lasts for 7.6 months (232 days), from around March 23 to around November 10, rarely starting before February 28 or after April 15, and rarely ending before October 19 or after December 7.

The month of October in Perroy is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly decreasing from 100% to 70% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in October in Perroy

Time Spent in Various Temperature Bands and the Growing Season in October in Perroygrowing seasonOct11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SepNov100%Oct 1100%Oct 170%Oct 3170%Oct 3196%Oct 1196%Oct 1187%Oct 2187%Oct 2150%Nov 1050%Nov 10freezingvery coldcoldcoolcomfortablewarm
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 Perroy are gradually increasing during October, increasing by 122°F, from 2,304°F to 2,426°F, over the course of the month.

Growing Degree Days in October in Perroy

Growing Degree Days in October in PerroyOct11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312,000°F2,000°F2,100°F2,100°F2,200°F2,200°F2,300°F2,300°F2,400°F2,400°F2,500°F2,500°F2,600°F2,600°F2,700°F2,700°F2,800°F2,800°FSepNovOct 12,304°FOct 12,304°FOct 312,426°FOct 312,426°FOct 112,363°FOct 112,363°FOct 212,403°FOct 212,403°F
The average growing degree days accumulated over the course of October, 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 Perroy is decreasing during October, falling by 1.4 kWh, from 3.6 kWh to 2.3 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in October in Perroy

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 Perroy are 46.467 deg latitude, 6.353 deg longitude, and 1,355 ft elevation.

The topography within 2 miles of Perroy contains very significant variations in elevation, with a maximum elevation change of 1,299 feet and an average elevation above sea level of 1,527 feet. Within 10 miles contains very significant variations in elevation (4,268 feet). Within 50 miles also contains extreme variations in elevation (14,160 feet).

The area within 2 miles of Perroy is covered by cropland (41%), water (35%), and artificial surfaces (19%), within 10 miles by water (32%) and cropland (29%), and within 50 miles by trees (41%) and cropland (22%).

This report illustrates the typical weather in Perroy, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Perroy.

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

The stations contributing to this reconstruction are:

Sources mapLSGG, 52%20 mi, 56 ftLSGN, 14%46 mi, 243 ftLSMS, 13%49 mi, 226 ftLFSA, 11%57 mi, -341 ftLFGJ, 10%59 mi, -712 ft© OpenStreetMap contributors

To get a sense of how much these sources agree with each other, you can view a comparison of Perroy 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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