Average Weather in Kempele Finland

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In Kempele, the summers are comfortable and partly cloudy and the winters are long, freezing, snowy, and overcast. Over the course of the year, the temperature typically varies from 7°F to 69°F and is rarely below -16°F or above 78°F.

The warm season lasts for 3.1 months, from May 31 to September 2, with an average daily high temperature above 59°F. The hottest day of the year is July 23, with an average high of 69°F and low of 54°F.

The cold season lasts for 3.8 months, from November 21 to March 15, with an average daily high temperature below 30°F. The coldest day of the year is February 3, with an average low of 7°F and high of 20°F.

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.

In Kempele, 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 Kempele begins around April 11 and lasts for 5.6 months, ending around September 28. On June 30, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 52% of the time, and overcast or mostly cloudy 48% of the time.

The cloudier part of the year begins around September 28 and lasts for 6.4 months, ending around April 11. On January 28, the cloudiest day of the year, the sky is overcast or mostly cloudy 82% of the time, and clear, mostly clear, or partly cloudy 18% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Kempele varies throughout the year.

The wetter season lasts 7.0 months, from May 10 to December 10, with a greater than 25% chance of a given day being a wet day. The chance of a wet day peaks at 34% on July 22.

The drier season lasts 5.0 months, from December 10 to May 10. The smallest chance of a wet day is 16% on February 23.

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 Kempele changes throughout the year.

Rain alone is the most common for 8.4 months, from March 22 to December 4. The highest chance of a day with rain alone is 34% on July 22.

Snow alone is the most common for 3.5 months, from December 4 to March 22. The highest chance of a day with snow alone is 15% on January 23.

Rainfall

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. Kempele experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.7 months, from March 27 to December 17, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around July 19, with an average total accumulation of 2.6 inches.

The rainless period of the year lasts for 3.3 months, from December 17 to March 27. The least rain falls around February 13, with an average total accumulation of 0.2 inches.

Snowfall

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. Kempele experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 6.7 months, from October 7 to April 28, 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 16, with an average total liquid-equivalent accumulation of 0.8 inches.

The snowless period of the year lasts for 5.3 months, from April 28 to October 7. The least snow falls around July 27, with an average total liquid-equivalent accumulation of 0.0 inches.

The length of the day in Kempele varies extremely over the course of the year. In 2017, the shortest day is December 21, with 3 hours, 38 minutes of daylight; the longest day is June 21, with 21 hours, 56 minutes of daylight.

The earliest sunrise is at 2:21 AM on June 20, and the latest sunrise is 8 hours, 6 minutes later at 10:27 AM on December 24. The earliest sunset is at 2:04 PM on December 18, and the latest sunset is 10 hours, 13 minutes later at 12:17 AM on June 21.

Daylight saving time (DST) is observed in Kempele during 2017, starting in the spring on March 26, lasting 7.1 months, and ending in the fall on October 29.

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 perceived humidity level in Kempele, 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, staying within 1% of 1% throughout.

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 Kempele experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.3 months, from October 1 to April 10, with average wind speeds of more than 3.6 miles per hour. The windiest day of the year is January 25, with an average hourly wind speed of 4.4 miles per hour.

The calmer time of year lasts for 5.7 months, from April 10 to October 1. The calmest day of the year is July 23, with an average hourly wind speed of 2.7 miles per hour.

The predominant average hourly wind direction in Kempele varies throughout the year.

The wind is most often from the west for 2.8 months, from April 26 to July 19, with a peak percentage of 33% on June 1. The wind is most often from the south for 9.2 months, from July 19 to April 26, with a peak percentage of 41% on January 1.

Kempele 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 water temperature experiences significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.3 months, from July 4 to September 14, with an average temperature above 53°F. The day of the year with the warmest water is August 7, with an average temperature of 59°F.

The time of year with cooler water lasts for 5.6 months, from November 30 to May 17, with an average temperature below 37°F. The day of the year with the coolest water is February 28, with an average temperature of 31°F.

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 experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 2.8 months, from May 11 to August 6, with an average daily incident shortwave energy per square meter above 4.7 kWh. The brightest day of the year is June 23, with an average of 5.9 kWh.

The darker period of the year lasts for 4.9 months, from October 6 to March 4, with an average daily incident shortwave energy per square meter below 1.2 kWh. The darkest day of the year is December 21, with an average of 0.0 kWh.

For the purposes of this report, the geographical coordinates of Kempele are 64.913 deg latitude, 25.503 deg longitude, and 23 ft elevation.

The topography within 2 miles of Kempele is essentially flat, with a maximum elevation change of 95 feet and an average elevation above sea level of 28 feet. Within 10 miles is essentially flat (197 feet). Within 50 miles contains only modest variations in elevation (623 feet).

The area within 2 miles of Kempele is covered by cropland (39%), artificial surfaces (33%), and trees (27%), within 10 miles by trees (40%) and cropland (26%), and within 50 miles by trees (53%) and water (28%).

This report illustrates the typical weather in Kempele, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Kempele.

For each station, the records are corrected for the elevation difference between that station and Kempele 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 Kempele is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Kempele and a given station.

The stations contributing to this reconstruction are: Oulu Airport (99%, 7 kilometers, west) and Kajaani Airport (1.4%, 126 kilometers, southeast).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.