Average Weather in April in Romanel-sur-Lausanne Switzerland
Daily high temperatures increase by 7°F, from 54°F to 61°F, rarely falling below 43°F or exceeding 72°F.
Daily low temperatures increase by 6°F, from 39°F to 44°F, rarely falling below 32°F or exceeding 51°F.
For reference, on August 4, the hottest day of the year, temperatures in Romanel-sur-Lausanne typically range from 58°F to 76°F, while on January 15, the coldest day of the year, they range from 28°F to 37°F.
Average High and Low Temperature in April
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. 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 April
The month of April in Romanel-sur-Lausanne experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 56% throughout the month.
The clearest day of the month is April 12, with clear, mostly clear, or partly cloudy conditions 46% of the time.
For reference, on November 24, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 59%, while on July 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 66%.
Cloud Cover Categories in April
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Romanel-sur-Lausanne, the chance of a wet day over the course of April is gradually increasing, starting the month at 32% and ending it at 36%.
For reference, the year's highest daily chance of a wet day is 44% on May 26, and its lowest chance is 27% on March 3.
Probability of Precipitation in April
The average sliding 31-day rainfall during April in Romanel-sur-Lausanne is gradually increasing, starting the month at 2.9 inches, when it rarely exceeds 5.4 inches or falls below 0.9 inches, and ending the month at 3.2 inches, when it rarely exceeds 5.3 inches or falls below 1.3 inches.
Average Monthly Rainfall in April
Over the course of April in Romanel-sur-Lausanne, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 31 minutes, implying an average daily increase of 3 minutes, 9 seconds, and weekly increase of 22 minutes, 5 seconds.
The shortest day of the month is April 1, with 12 hours, 49 minutes of daylight and the longest day is April 30, with 14 hours, 20 minutes of daylight.
Hours of Daylight and Twilight in April
The latest sunrise of the month in Romanel-sur-Lausanne is 7:13 AM on April 1 and the earliest sunrise is 52 minutes earlier at 6:21 AM on April 30.
The earliest sunset is 8:02 PM on April 1 and the latest sunset is 39 minutes later at 8:41 PM on April 30.
Daylight saving time is observed in Romanel-sur-Lausanne during 2018, but it neither starts nor ends during April, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:40 AM and sets 15 hours, 50 minutes later, at 9:30 PM, while on December 21, the shortest day of the year, it rises at 8:14 AM and sets 8 hours, 34 minutes later, at 4:48 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in April
The chance that a given day will be muggy in Romanel-sur-Lausanne is essentially constant during April, remaining around 0% throughout.
For reference, on July 25, the muggiest day of the year, there are muggy conditions 0% 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 April
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Romanel-sur-Lausanne is gradually decreasing during April, decreasing from 7.1 miles per hour to 6.4 miles per hour over the course of the month.
For reference, on April 3, the windiest day of the year, the daily average wind speed is 7.1 miles per hour, while on August 10, the calmest day of the year, the daily average wind speed is 5.7 miles per hour.
The highest daily average wind speed during April is 7.1 miles per hour on April 3.
Average Wind Speed in April
Wind Direction in April
The growing season in Romanel-sur-Lausanne typically lasts for 7.1 months (217 days), from around April 2 to around November 5, rarely starting before March 10 or after April 21, and rarely ending before October 17 or after November 30.
During April in Romanel-sur-Lausanne, the chance that a given day is within the growing season is rapidly increasing rising from 48% to 97% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in April
The average accumulated growing degree days in Romanel-sur-Lausanne are gradually increasing during April, increasing by 89°F, from 33°F to 122°F, over the course of the month.
Growing Degree Days in April
The average daily incident shortwave solar energy in Romanel-sur-Lausanne is increasing during April, rising by 1.1 kWh, from 4.4 kWh to 5.5 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in April
For the purposes of this report, the geographical coordinates of Romanel-sur-Lausanne are 46.564 deg latitude, 6.605 deg longitude, and 1,952 ft elevation.
The topography within 2 miles of Romanel-sur-Lausanne contains very significant variations in elevation, with a maximum elevation change of 1,132 feet and an average elevation above sea level of 1,957 feet. Within 10 miles also contains very significant variations in elevation (1,916 feet). Within 50 miles contains very significant variations in elevation (12,641 feet).
The area within 2 miles of Romanel-sur-Lausanne is covered by cropland (45%), artificial surfaces (39%), and trees (16%), within 10 miles by cropland (48%) and water (22%), and within 50 miles by trees (39%) and cropland (23%).
This report illustrates the typical weather in Romanel-sur-Lausanne year round, 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 Romanel-sur-Lausanne.
For each station, the records are corrected for the elevation difference between that station and Romanel-sur-Lausanne 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 Romanel-sur-Lausanne is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Romanel-sur-Lausanne and a given station.
The stations contributing to this reconstruction are: Aéroport Genève-Cointrin (37%, 53 kilometers, southwest); Neuchatel (36%, 55 kilometers, northeast); and Sion (27%, 67 kilometers, southeast).
Time zones for aiports and weather stations are provided by AskGeo.com .