Climate and Average Weather Year Round in Kumlinge Åland Islands

In Kumlinge, the summers are short, cool, and partly cloudy; the winters are long, freezing, snowy, and mostly cloudy; and it is windy year round. Over the course of the year, the temperature typically varies from 22°F to 67°F and is rarely below 5°F or above 75°F.

Based on the tourism score, the best time of year to visit Kumlinge for warm-weather activities is from early July to mid August.

The warm season lasts for 2.8 months, from June 13 to September 6, with an average daily high temperature above 60°F. The hottest month of the year in Kumlinge is July, with an average high of 66°F and low of 55°F.

The cold season lasts for 3.8 months, from December 2 to March 29, with an average daily high temperature below 38°F. The coldest month of the year in Kumlinge is February, with an average low of 23°F and high of 31°F.

In Kumlinge, 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 Kumlinge begins around April 28 and lasts for 5.5 months, ending around October 10.

The clearest month of the year in Kumlinge is July, during which on average the sky is clear, mostly clear, or partly cloudy 58% of the time.

The cloudier part of the year begins around October 10 and lasts for 6.6 months, ending around April 28.

The cloudiest month of the year in Kumlinge is January, during which on average the sky is overcast or mostly cloudy 69% 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 Kumlinge varies throughout the year.

The wetter season lasts 5.2 months, from August 3 to January 9, with a greater than 25% chance of a given day being a wet day. The month with the most wet days in Kumlinge is November, with an average of 9.4 days with at least 0.04 inches of precipitation.

The drier season lasts 6.8 months, from January 9 to August 3. The month with the fewest wet days in Kumlinge is March, with an average of 5.8 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Kumlinge is November, with an average of 8.6 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 30% on November 10.

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. Kumlinge experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Kumlinge. The month with the most rain in Kumlinge is October, with an average rainfall of 2.1 inches.

The month with the least rain in Kumlinge is February, with an average rainfall of 0.7 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Kumlinge experiences some seasonal variation in monthly snowfall.

The snowy period of the year lasts for 4.7 months, from November 14 to April 4, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Kumlinge is January, with an average snowfall of 3.4 inches.

The snowless period of the year lasts for 7.3 months, from April 4 to November 14. The least snow falls around July 27, with an average total accumulation of 0.0 inches.

The length of the day in Kumlinge varies extremely over the course of the year. In 2024, the shortest day is December 21, with 5 hours, 47 minutes of daylight; the longest day is June 20, with 18 hours, 58 minutes of daylight.

The earliest sunrise is at 4:09 AM on June 18, and the latest sunrise is 5 hours, 34 minutes later at 9:42 AM on December 26. The earliest sunset is at 3:27 PM on December 15, and the latest sunset is 7 hours, 41 minutes later at 11:07 PM on June 22.

Daylight saving time (DST) is observed in Kumlinge during 2024, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 27.

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

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 Kumlinge, 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 Kumlinge experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.9 months, from September 13 to March 9, with average wind speeds of more than 14.3 miles per hour. The windiest month of the year in Kumlinge is December, with an average hourly wind speed of 17.6 miles per hour.

The calmer time of year lasts for 6.1 months, from March 9 to September 13. The calmest month of the year in Kumlinge is May, with an average hourly wind speed of 11.0 miles per hour.

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

The wind is most often from the south for 8.3 months, from February 12 to October 20 and for 3.9 weeks, from October 28 to November 24, with a peak percentage of 40% on July 23. The wind is most often from the west for 1.1 weeks, from October 20 to October 28 and for 2.6 months, from November 24 to February 12, with a peak percentage of 32% on October 22.

Kumlinge 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 2.4 months, from July 1 to September 15, with an average temperature above 56°F. The month of the year in Kumlinge with the warmest water is August, with an average temperature of 61°F.

The time of year with cooler water lasts for 4.6 months, from December 16 to May 3, with an average temperature below 39°F. The month of the year in Kumlinge with the coolest water is March, with an average temperature of 33°F.

To characterize how pleasant the weather is in Kumlinge 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 Kumlinge for general outdoor tourist activities is from early July to mid August, with a peak score in the third 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 Kumlinge for hot-weather activities is from mid July to early August, with a peak score in the last week of July.

Methodology

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.

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 Kumlinge typically lasts for 5.5 months (170 days), from around May 5 to around October 22, rarely starting before April 18 or after May 21, and rarely ending before September 28 or after November 15.

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.

Based on growing degree days alone, the first spring blooms in Kumlinge should appear around June 6, only rarely appearing before May 25 or after June 21.

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 3.0 months, from May 7 to August 7, with an average daily incident shortwave energy per square meter above 5.3 kWh. The brightest month of the year in Kumlinge is June, with an average of 6.5 kWh.

The darker period of the year lasts for 4.5 months, from October 14 to February 28, with an average daily incident shortwave energy per square meter below 1.4 kWh. The darkest month of the year in Kumlinge is December, with an average of 0.2 kWh.

For the purposes of this report, the geographical coordinates of Kumlinge are 60.260 deg latitude, 20.779 deg longitude, and 52 ft elevation.

The topography within 2 miles of Kumlinge is essentially flat, with a maximum elevation change of 95 feet and an average elevation above sea level of 36 feet. Within 10 miles is essentially flat (118 feet). Within 50 miles also contains only modest variations in elevation (453 feet).

The area within 2 miles of Kumlinge is covered by trees (69%), within 10 miles by water (86%), and within 50 miles by water (82%) and trees (13%).