Average Weather in Prilly Switzerland
In Prilly, the summers are comfortable, the winters are very cold, and it is wet and partly cloudy year round. Over the course of the year, the temperature typically varies from 30°F to 78°F and is rarely below 21°F or above 88°F.
Based on the tourism score, the best time of year to visit Prilly for warm-weather activities is from late June to early September.
The warm season lasts for 3.1 months, from June 5 to September 9, with an average daily high temperature above 70°F. The hottest day of the year is August 4, with an average high of 78°F and low of 60°F.
The cold season lasts for 3.5 months, from November 17 to March 2, with an average daily high temperature below 46°F. The coldest day of the year is January 15, with an average low of 30°F and high of 39°F.
Average High and Low Temperature
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
In Prilly, 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 in Prilly begins around June 18 and lasts for 3.0 months, ending around September 17. On July 23, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 66% of the time, and overcast or mostly cloudy 34% of the time.
The cloudier part of the year begins around September 17 and lasts for 9.0 months, ending around June 18. On May 8, the cloudiest day of the year, the sky is overcast or mostly cloudy 58% of the time, and clear, mostly clear, or partly cloudy 41% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Prilly varies throughout the year.
The wetter season lasts 2.1 months, from April 29 to July 2, with a greater than 35% chance of a given day being a wet day. The chance of a wet day peaks at 43% on May 25.
The drier season lasts 9.9 months, from July 2 to April 29. The smallest chance of a wet day is 27% on March 3.
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 throughout the year is rain alone, with a peak probability of 43% on May 25.
Daily Chance of Precipitation
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. Prilly experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Prilly. The most rain falls during the 31 days centered around May 31, with an average total accumulation of 3.9 inches.
The least rain falls around March 9, with an average total accumulation of 2.6 inches.
Average Monthly Rainfall
The sliding 31-day liquid-equivalent quantity of snowfall in Prilly does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Prilly varies significantly over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 34 minutes of daylight; the longest day is June 21, with 15 hours, 50 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:39 AM on June 16, and the latest sunrise is 2 hours, 38 minutes later at 8:17 AM on January 1. The earliest sunset is at 4:46 PM on December 11, and the latest sunset is 4 hours, 45 minutes later at 9:30 PM on June 26.
Daylight saving time (DST) is observed in Prilly during 2018, starting in the spring on March 25, lasting 7.1 months, and ending in the fall on October 28.
Sunrise & Sunset with Twilight and Daylight Saving Time
The perceived humidity level in Prilly, 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, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
The average hourly wind speed in Prilly experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 5.0 months, from November 28 to April 28, with average wind speeds of more than 6.4 miles per hour. The windiest day of the year is April 3, with an average hourly wind speed of 7.1 miles per hour.
The calmer time of year lasts for 7.0 months, from April 28 to November 28. The calmest day of the year is August 10, with an average hourly wind speed of 5.7 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Prilly varies throughout the year.
The wind is most often from the north for 2.7 weeks, from April 8 to April 27, with a peak percentage of 31% on April 20. The wind is most often from the west for 4.6 months, from April 27 to September 16, with a peak percentage of 41% on July 5. The wind is most often from the south for 6.7 months, from September 16 to April 8, with a peak percentage of 51% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Prilly 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 Prilly for general outdoor tourist activities is from late June to early September, with a peak score in the first week of August.
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 Prilly for hot-weather activities is from early July to mid August, with a peak score in the last week of July.
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.
The growing season in Prilly typically lasts for 7.5 months (230 days), from around March 24 to around November 9, rarely starting before March 1 or after April 18, and rarely ending before October 19 or after December 5.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Prilly should appear around April 17, only rarely appearing before April 3 or after May 1.
Growing Degree Days
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 3.2 months, from May 12 to August 18, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is July 6, with an average of 7.0 kWh.
The darker period of the year lasts for 3.5 months, from October 29 to February 13, with an average daily incident shortwave energy per square meter below 2.4 kWh. The darkest day of the year is December 24, with an average of 1.3 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Prilly are 46.537 deg latitude, 6.605 deg longitude, and 1,572 ft elevation.
The topography within 2 miles of Prilly contains very significant variations in elevation, with a maximum elevation change of 1,063 feet and an average elevation above sea level of 1,646 feet. Within 10 miles also contains very significant variations in elevation (1,919 feet). Within 50 miles contains very significant variations in elevation (13,720 feet).
The area within 2 miles of Prilly is covered by artificial surfaces (73%) and cropland (22%), within 10 miles by cropland (42%) and water (31%), and within 50 miles by trees (39%) and cropland (22%).
This report illustrates the typical weather in Prilly, 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 Prilly.
For each station, the records are corrected for the elevation difference between that station and Prilly 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 Prilly is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Prilly and a given station.
The stations contributing to this reconstruction are: Aéroport Genève-Cointrin (40%, 51 kilometers, southwest); Neuchatel (33%, 58 kilometers, northeast); and Sion (27%, 65 kilometers, southeast).
Time zones for aiports and weather stations are provided by AskGeo.com .