Fall Weather in Mäntsälä Finland

Daily high temperatures decrease by 31°F, from 63°F to 32°F, rarely falling below 20°F or exceeding 71°F.

Daily low temperatures decrease by 23°F, from 46°F to 24°F, rarely falling below 6°F or exceeding 54°F.

For reference, on July 21, the hottest day of the year, temperatures in Mäntsälä typically range from 54°F to 72°F, while on February 7, the coldest day of the year, they range from 14°F to 25°F.

The figure below shows you a compact characterization of the hourly average fall temperatures. 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.

Smithers, Canada (4,326 miles away); Laurium, United States (4,124 miles); and Pasadena, Canada (3,166 miles) are the far-away foreign places with temperatures most similar to Mäntsälä (view comparison).

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The fall in Mäntsälä experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 52% to 76%.

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

For reference, on January 28, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 80%, while on July 17, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 58%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Mäntsälä, the chance of a wet day over the course of the fall is essentially constant, remaining around 28% throughout.

For reference, the year's highest daily chance of a wet day is 31% on November 8, and its lowest chance is 16% on February 26.

Over the course of the fall in Mäntsälä, the chance of a day with only rain decreases from 27% to 15%, the chance of a day with mixed snow and rain increases from 0% to 6%, and the chance of a day with only snow increases from 0% to 8%.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the fall in Mäntsälä is decreasing, starting the season at 2.0 inches, when it rarely exceeds 3.7 inches or falls below 0.5 inches, and ending the season at 1.1 inches, when it rarely exceeds 2.2 inches or falls below 0.2 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during the fall in Mäntsälä is very rapidly increasing, starting the season at -0.0 inches, when it rarely exceeds 0.0 inches or falls below -0.0 inches, and ending the season at 5.4 inches, when it rarely exceeds 10.6 inches or falls below 0.4 inches.

Over the course of the fall in Mäntsälä, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 7 hours, 51 minutes, implying an average daily decrease of 5 minutes, 14 seconds, and weekly decrease of 36 minutes, 38 seconds.

The shortest day of the fall is November 30, with 6 hours, 19 minutes of daylight and the longest day is September 1, with 14 hours, 10 minutes of daylight.

The earliest sunrise of the fall in Mäntsälä is 6:12 AM on September 1 and the latest sunrise is 2 hours, 45 minutes later at 8:57 AM on November 30.

The latest sunset is 8:22 PM on September 1 and the earliest sunset is 5 hours, 6 minutes earlier at 3:16 PM on November 30.

Daylight saving time (DST) starts at 3:00 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 3:46 AM and sets 19 hours, 7 minutes later, at 10:54 PM, while on December 21, the shortest day of the year, it rises at 9:27 AM and sets 5 hours, 40 minutes later, at 3:06 PM.

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.

The figure below presents a compact representation of key lunar data for the fall of 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.

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 Mäntsälä is essentially constant during the fall, remaining around 0% throughout.

For reference, on July 27, 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.

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 Mäntsälä is increasing during the fall, increasing from 5.2 miles per hour to 6.3 miles per hour over the course of the season.

For reference, on December 13, the windiest day of the year, the daily average wind speed is 6.5 miles per hour, while on July 20, the calmest day of the year, the daily average wind speed is 4.7 miles per hour.

The hourly average wind direction in Mäntsälä throughout the fall is predominantly from the south, with a peak proportion of 36% on November 10.

Mäntsälä is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Mäntsälä is very rapidly decreasing during the fall, falling by 20°F, from 60°F to 40°F, over the course of the season.

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 Mäntsälä typically lasts for 4.4 months (135 days), from around May 11 to around September 22, rarely starting before April 22 or after May 28, and rarely ending before September 5 or after October 11.

During the fall in Mäntsälä, the chance that a given day is within the growing season is very rapidly decreasing falling from 95% to -0% over the course of the 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 Mäntsälä are gradually increasing during the fall, increasing by 120°F, from 1,210°F to 1,330°F, over the course of the season.

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 Mäntsälä is very rapidly decreasing during the fall, falling by 3.4 kWh, from 3.6 kWh to 0.2 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Mäntsälä are 60.633 deg latitude, 25.317 deg longitude, and 210 ft elevation.

The topography within 2 miles of Mäntsälä contains only modest variations in elevation, with a maximum elevation change of 131 feet and an average elevation above sea level of 258 feet. Within 10 miles also contains only modest variations in elevation (338 feet). Within 50 miles contains only modest variations in elevation (735 feet).

The area within 2 miles of Mäntsälä is covered by trees (37%), artificial surfaces (37%), and cropland (26%), within 10 miles by trees (62%) and cropland (32%), and within 50 miles by trees (51%) and water (23%).