Climate and Average Weather Year Round in Öckerö Sweden

In Öckerö, the summers are comfortable; the winters are long, very cold, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 27°F to 69°F and is rarely below 13°F or above 77°F.

Based on the tourism score, the best time of year to visit Öckerö for warm-weather activities is from late June to mid August.

The warm season lasts for 3.2 months, from June 3 to September 9, with an average daily high temperature above 62°F. The hottest month of the year in Öckerö is July, with an average high of 68°F and low of 56°F.

The cold season lasts for 3.9 months, from November 24 to March 21, with an average daily high temperature below 42°F. The coldest month of the year in Öckerö is February, with an average low of 28°F and high of 36°F.

In Öckerö, 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 Öckerö begins around April 20 and lasts for 5.7 months, ending around October 9.

The clearest month of the year in Öckerö is July, during which on average the sky is clear, mostly clear, or partly cloudy 57% of the time.

The cloudier part of the year begins around October 9 and lasts for 6.3 months, ending around April 20.

The cloudiest month of the year in Öckerö is January, during which on average the sky is overcast or mostly cloudy 66% 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 Öckerö varies throughout the year.

The wetter season lasts 7.4 months, from June 17 to January 29, with a greater than 31% chance of a given day being a wet day. The month with the most wet days in Öckerö is October, with an average of 11.6 days with at least 0.04 inches of precipitation.

The drier season lasts 4.6 months, from January 29 to June 17. The month with the fewest wet days in Öckerö is April, with an average of 7.2 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 Öckerö is October, with an average of 11.5 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 39% on October 17.

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. Öckerö experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Öckerö. The month with the most rain in Öckerö is October, with an average rainfall of 3.2 inches.

The month with the least rain in Öckerö is April, with an average rainfall of 1.7 inches.

Snowfall

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

The snowy period of the year lasts for 3.6 months, from November 29 to March 17, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Öckerö is January, with an average snowfall of 2.4 inches.

The snowless period of the year lasts for 8.4 months, from March 17 to November 29. The least snow falls around July 17, with an average total accumulation of 0.0 inches.

The length of the day in Öckerö varies extremely over the course of the year. In 2024, the shortest day is December 21, with 6 hours, 32 minutes of daylight; the longest day is June 20, with 18 hours, 6 minutes of daylight.

The earliest sunrise is at 4:12 AM on June 18, and the latest sunrise is 4 hours, 45 minutes later at 8:57 AM on December 28. The earliest sunset is at 3:25 PM on December 14, and the latest sunset is 6 hours, 52 minutes later at 10:18 PM on June 23.

Daylight saving time (DST) is observed in Öckerö 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 Öckerö, 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 Öckerö experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.1 months, from September 10 to March 15, with average wind speeds of more than 10.8 miles per hour. The windiest month of the year in Öckerö is January, with an average hourly wind speed of 12.6 miles per hour.

The calmer time of year lasts for 5.9 months, from March 15 to September 10. The calmest month of the year in Öckerö is May, with an average hourly wind speed of 8.9 miles per hour.

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

The wind is most often from the west for 1.3 months, from January 12 to February 20; for 7.4 months, from February 26 to October 8; and for 1.7 weeks, from December 18 to December 30, with a peak percentage of 48% on July 18. The wind is most often from the south for 6.0 days, from February 20 to February 26; for 2.3 months, from October 8 to December 18; and for 1.9 weeks, from December 30 to January 12, with a peak percentage of 36% on November 8.

Öckerö 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 3.0 months, from June 16 to September 17, with an average temperature above 59°F. The month of the year in Öckerö with the warmest water is August, with an average temperature of 63°F.

The time of year with cooler water lasts for 3.9 months, from December 13 to April 11, with an average temperature below 42°F. The month of the year in Öckerö with the coolest water is February, with an average temperature of 36°F.

To characterize how pleasant the weather is in Öckerö 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 Öckerö for general outdoor tourist activities is from late June 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 Öckerö for hot-weather activities is from mid July to mid 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 Öckerö typically lasts for 5.9 months (181 days), from around April 22 to around October 20, rarely starting before April 6 or after May 9, and rarely ending before September 27 or after November 19.

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 Öckerö should appear around May 18, only rarely appearing before May 6 or after June 2.

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 3.1 months, from May 4 to August 9, with an average daily incident shortwave energy per square meter above 5.1 kWh. The brightest month of the year in Öckerö is June, with an average of 6.3 kWh.

The darker period of the year lasts for 4.3 months, from October 17 to February 26, with an average daily incident shortwave energy per square meter below 1.5 kWh. The darkest month of the year in Öckerö is December, with an average of 0.3 kWh.

For the purposes of this report, the geographical coordinates of Öckerö are 57.708 deg latitude, 11.656 deg longitude, and 16 ft elevation.

The topography within 2 miles of Öckerö contains only modest variations in elevation, with a maximum elevation change of 105 feet and an average elevation above sea level of 12 feet. Within 10 miles also contains only modest variations in elevation (315 feet). Within 50 miles contains only modest variations in elevation (1,047 feet).

The area within 2 miles of Öckerö is covered by water (49%) and artificial surfaces (33%), within 10 miles by water (75%), and within 50 miles by water (57%) and trees (28%).