Average Weather in Monthey Switzerland
In Monthey, the summers are warm, the winters are very cold and wet, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 27°F to 78°F and is rarely below 18°F or above 88°F.
Based on the tourism score, the best time of year to visit Monthey for warm-weather activities is from late June to early September.
The warm season lasts for 3.4 months, from May 30 to September 11, with an average daily high temperature above 70°F. The hottest day of the year is July 27, with an average high of 78°F and low of 59°F.
The cold season lasts for 3.4 months, from November 19 to March 1, with an average daily high temperature below 47°F. The coldest day of the year is January 19, with an average low of 27°F and high of 40°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 Monthey, 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 Monthey begins around June 20 and lasts for 3.0 months, ending around September 18. On July 23, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 62% of the time, and overcast or mostly cloudy 38% of the time.
The cloudier part of the year begins around September 18 and lasts for 9.0 months, ending around June 20. On May 8, the cloudiest day of the year, the sky is overcast or mostly cloudy 62% of the time, and clear, mostly clear, or partly cloudy 38% 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 Monthey varies throughout the year.
The wetter season lasts 3.3 months, from May 3 to August 13, with a greater than 34% chance of a given day being a wet day. The chance of a wet day peaks at 42% on May 25.
The drier season lasts 8.7 months, from August 13 to May 3. The smallest chance of a wet day is 26% 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 42% 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. Monthey experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Monthey. The most rain falls during the 31 days centered around June 3, with an average total accumulation of 3.6 inches.
The least rain falls around March 9, with an average total accumulation of 2.5 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. Monthey experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 3.1 months, from November 20 to February 24, 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 15, with an average total liquid-equivalent accumulation of 0.3 inches.
The snowless period of the year lasts for 8.9 months, from February 24 to November 20. 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 Monthey varies significantly over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 36 minutes of daylight; the longest day is June 21, with 15 hours, 47 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, 35 minutes later at 8:15 AM on January 1. The earliest sunset is at 4:45 PM on December 11, and the latest sunset is 4 hours, 42 minutes later at 9:28 PM on June 26.
Daylight saving time (DST) is observed in Monthey 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 Monthey, 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
Average Wind Speed
The predominant average hourly wind direction in Monthey varies throughout the year.
The wind is most often from the north for 1.7 weeks, from April 18 to April 30, with a peak percentage of 29% on April 20. The wind is most often from the west for 4.4 months, from April 30 to September 11, with a peak percentage of 42% on July 6. The wind is most often from the south for 7.2 months, from September 11 to April 18, with a peak percentage of 52% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Monthey 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 Monthey 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 Monthey 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 Monthey typically lasts for 7.3 months (224 days), from around March 29 to around November 7, rarely starting before March 8 or after April 19, and rarely ending before October 19 or after December 1.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Monthey should appear around April 15, only rarely appearing before April 2 or after April 29.
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 3.3 months, from May 9 to August 18, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest day of the year is July 5, with an average of 7.1 kWh.
The darker period of the year lasts for 3.4 months, from October 29 to February 10, with an average daily incident shortwave energy per square meter below 2.6 kWh. The darkest day of the year is December 21, with an average of 1.4 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Monthey are 46.255 deg latitude, 6.954 deg longitude, and 1,634 ft elevation.
The topography within 2 miles of Monthey contains large variations in elevation, with a maximum elevation change of 3,182 feet and an average elevation above sea level of 1,881 feet. Within 10 miles contains large variations in elevation (9,337 feet). Within 50 miles also contains extreme variations in elevation (14,633 feet).
The area within 2 miles of Monthey is covered by artificial surfaces (37%), trees (32%), and cropland (31%), within 10 miles by trees (41%) and grassland (25%), and within 50 miles by trees (32%) and grassland (20%).
This report illustrates the typical weather in Monthey, 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 Monthey.
For each station, the records are corrected for the elevation difference between that station and Monthey 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 Monthey is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Monthey and a given station.
The stations contributing to this reconstruction are: Sion (67%, 28 kilometers, east); Aéroport Genève-Cointrin (19%, 65 kilometers, west); and Neuchatel (14%, 83 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .