Average Weather in Guillestre France
In Guillestre, the summers are comfortable; the winters are long, freezing, and dry; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 20°F to 71°F and is rarely below 10°F or above 78°F.
Based on the tourism score, the best time of year to visit Guillestre for warm-weather activities is from early July to late August.
The warm season lasts for 3.0 months, from June 12 to September 12, with an average daily high temperature above 64°F. The hottest day of the year is August 3, with an average high of 71°F and low of 53°F.
The cold season lasts for 3.9 months, from November 17 to March 13, with an average daily high temperature below 42°F. The coldest day of the year is January 31, with an average low of 20°F and high of 35°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
Terrace, Canada (5,104 miles away); Upper Bear Creek, Colorado, United States (5,255 miles); and Jonesport, Maine, United States (3,521 miles) are the far-away foreign places with temperatures most similar to Guillestre (view comparison).
In Guillestre, 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 Guillestre begins around June 18 and lasts for 2.9 months, ending around September 14. On July 21, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 75% of the time, and overcast or mostly cloudy 25% of the time.
The cloudier part of the year begins around September 14 and lasts for 9.1 months, ending around June 18. On May 8, the cloudiest day of the year, the sky is overcast or mostly cloudy 55% of the time, and clear, mostly clear, or partly cloudy 45% 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 Guillestre varies throughout the year.
The wetter season lasts 7.5 months, from April 4 to November 20, with a greater than 22% chance of a given day being a wet day. The chance of a wet day peaks at 30% on May 8.
The drier season lasts 4.5 months, from November 20 to April 4. The smallest chance of a wet day is 14% on March 5.
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 in Guillestre changes throughout the year.
Rain alone is the most common for 10.0 months, from February 21 to December 21. The highest chance of a day with rain alone is 29% on May 8.
Snow alone is the most common for 1.8 months, from December 21 to February 15. The highest chance of a day with snow alone is 9% on January 15.
Mixed snow and rain is the most common for 6.0 days, from February 15 to February 21. The highest chance of a day with mixed snow and rain is 6% on December 15.
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. Guillestre experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Guillestre. The most rain falls during the 31 days centered around October 20, with an average total accumulation of 2.5 inches.
The least rain falls around January 30, with an average total accumulation of 0.5 inches.
Average Monthly Rainfall
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Guillestre experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.3 months, from November 4 to April 13, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 19, with an average total liquid-equivalent accumulation of 0.7 inches.
The snowless period of the year lasts for 6.7 months, from April 13 to November 4. The least snow falls around July 24, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Guillestre varies significantly over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 48 minutes of daylight; the longest day is June 21, with 15 hours, 34 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:47 AM on June 15, and the latest sunrise is 2 hours, 23 minutes later at 8:10 AM on January 2. The earliest sunset is at 4:52 PM on December 10, and the latest sunset is 4 hours, 30 minutes later at 9:22 PM on June 26.
Daylight saving time (DST) is observed in Guillestre 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 Guillestre, 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 Guillestre experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 4.5 months, from January 7 to May 23, with average wind speeds of more than 4.7 miles per hour. The windiest day of the year is April 1, with an average hourly wind speed of 5.4 miles per hour.
The calmer time of year lasts for 7.5 months, from May 23 to January 7. The calmest day of the year is August 10, with an average hourly wind speed of 4.1 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Guillestre varies throughout the year.
The wind is most often from the east for 2.9 weeks, from April 19 to May 9 and for 2.4 weeks, from October 18 to November 4, with a peak percentage of 30% on October 24. The wind is most often from the west for 5.3 months, from May 9 to October 18 and for 1.3 weeks, from November 4 to November 13, with a peak percentage of 42% on July 6. The wind is most often from the north for 5.2 months, from November 13 to April 19, with a peak percentage of 36% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Guillestre 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 Guillestre for general outdoor tourist activities is from early July to late August, with a peak score in the last week of July.
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 Guillestre for hot-weather activities is from mid 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 Guillestre typically lasts for 5.8 months (176 days), from around April 27 to around October 20, rarely starting before April 8 or after May 21, and rarely ending before October 2 or after November 9.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Guillestre should appear around May 25, only rarely appearing before May 14 or after June 8.
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 3.1 months, from May 13 to August 18, with an average daily incident shortwave energy per square meter above 6.4 kWh. The brightest day of the year is July 6, with an average of 7.6 kWh.
The darker period of the year lasts for 3.4 months, from October 26 to February 8, with an average daily incident shortwave energy per square meter below 2.9 kWh. The darkest day of the year is December 19, with an average of 1.8 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Guillestre are 44.660 deg latitude, 6.649 deg longitude, and 4,469 ft elevation.
The topography within 2 miles of Guillestre contains extreme variations in elevation, with a maximum elevation change of 3,625 feet and an average elevation above sea level of 3,935 feet. Within 10 miles also contains extreme variations in elevation (8,333 feet). Within 50 miles also contains extreme variations in elevation (12,487 feet).
The area within 2 miles of Guillestre is covered by trees (54%) and grassland (31%), within 10 miles by trees (44%) and grassland (24%), and within 50 miles by trees (39%) and grassland (21%).
This report illustrates the typical weather in Guillestre, 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 6 weather stations near enough to contribute to our estimation of the temperature and dew point in Guillestre.
For each station, the records are corrected for the elevation difference between that station and Guillestre 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 Guillestre is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Guillestre and a given station.
The stations contributing to this reconstruction are: Cuneo International Airport (20%, 78 kilometers, east); Château-Arnoux-Saint-Auban Airport (20%, 84 kilometers, southwest); Torino / Bric Della Croce (22%, 95 kilometers, northeast); Nice Côte d'Azur International Airport (11%, 120 kilometers, south); Chambéry Airport (13%, 125 kilometers, northwest); and Grenoble-Isère Airport (13%, 130 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .