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Climate and Average Weather Year Round in Mosfellsbær Iceland

In Mosfellsbær, the summers are short, cool, and mostly cloudy and the winters are long, freezing, snowy, windy, and overcast. Over the course of the year, the temperature typically varies from 27°F to 57°F and is rarely below 15°F or above 62°F.

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

Climate in Mosfellsbær

very coldcoldcoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDecNowNow43%43%22%22%overcastclearprecipitation: 5.3 inprecipitation: 5.3 in2.1 in2.1 inmuggy: 0%muggy: 0%drydrytourism score: 2.9tourism score: 2.90.00.0
Mosfellsbær weather by month. Click on each chart for more information.

The warm season lasts for 2.9 months, from June 7 to September 4, with an average daily high temperature above 52°F. The hottest month of the year in Mosfellsbær is July, with an average high of 56°F and low of 48°F.

The cold season lasts for 4.9 months, from November 7 to April 2, with an average daily high temperature below 39°F. The coldest month of the year in Mosfellsbær is January, with an average low of 27°F and high of 35°F.

Average High and Low Temperature in Mosfellsbær

Average High and Low Temperature in MosfellsbærwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2535°FJan 2535°FJul 3057°FJul 3057°F27°F27°F48°F48°FJun 752°FJun 752°FSep 452°FSep 452°FNov 739°FNov 739°FApr 239°FApr 239°F43°F43°F44°F44°F31°F31°F30°F30°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 35°F36°F37°F41°F48°F53°F56°F55°F50°F43°F38°F35°F
Temp. 31°F31°F32°F37°F43°F49°F52°F51°F46°F39°F34°F31°F
Low 27°F27°F28°F32°F39°F45°F48°F47°F41°F35°F30°F28°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.

Average Hourly Temperature in Mosfellsbær

Average Hourly Temperature in MosfellsbærJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowfreezingvery coldvery coldcoldcoolfreezing
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

King Cove, Alaska, United States (3,941 miles away) and Kodiak Station, Alaska, United States (3,629 miles) are the far-away foreign places with temperatures most similar to Mosfellsbær (view comparison).

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In Mosfellsbær, 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 Mosfellsbær begins around April 1 and lasts for 7.1 months, ending around November 4.

The clearest month of the year in Mosfellsbær is May, during which on average the sky is clear, mostly clear, or partly cloudy 42% of the time.

The cloudier part of the year begins around November 4 and lasts for 4.9 months, ending around April 1.

The cloudiest month of the year in Mosfellsbær is January, during which on average the sky is overcast or mostly cloudy 77% of the time.

Cloud Cover Categories in Mosfellsbær

Cloud Cover Categories in MosfellsbærclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 2043%May 2043%Jan 2122%Jan 2122%Apr 133%Apr 133%Nov 433%Nov 433%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 77%76%71%63%58%61%62%63%65%65%69%73%
Clearer 23%24%29%37%42%39%38%37%35%35%31%27%

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

The wetter season lasts 7.4 months, from August 26 to April 7, with a greater than 42% chance of a given day being a wet day. The month with the most wet days in Mosfellsbær is February, with an average of 15.6 days with at least 0.04 inches of precipitation.

The drier season lasts 4.6 months, from April 7 to August 26. The month with the fewest wet days in Mosfellsbær is June, with an average of 9.1 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 Mosfellsbær is September, with an average of 13.8 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 47% on September 20.

Daily Chance of Precipitation in Mosfellsbær

Daily Chance of Precipitation in MosfellsbærwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 2655%Feb 2655%Jun 1629%Jun 1629%Aug 2642%Aug 2642%Apr 742%Apr 742%NowNowsnowmixedrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 8.5d8.7d9.0d10.2d9.7d9.0d10.0d12.1d13.8d12.9d10.9d8.6d
Mixed 4.2d4.2d3.6d1.3d0.2d0.0d0.0d0.0d0.0d0.6d2.1d3.9d
Snow 3.1d2.7d2.5d0.7d0.0d0.0d0.0d0.0d0.0d0.1d1.1d2.9d
Any 15.8d15.6d15.1d12.2d10.0d9.1d10.0d12.1d13.9d13.6d14.0d15.5d

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. Mosfellsbær experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Mosfellsbær. The month with the most rain in Mosfellsbær is September, with an average rainfall of 4.5 inches.

The month with the least rain in Mosfellsbær is June, with an average rainfall of 2.2 inches.

Average Monthly Rainfall in Mosfellsbær

Average Monthly Rainfall in MosfellsbærJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 inSep 254.6 inSep 254.6 inJun 62.1 inJun 62.1 inFeb 154.2 inFeb 154.2 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 3.9″4.2″3.6″2.9″2.3″2.2″2.6″3.4″4.5″4.4″4.1″4.0″

Snowfall

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

The snowy period of the year lasts for 6.3 months, from October 18 to April 29, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Mosfellsbær is January, with an average snowfall of 11.7 inches.

The snowless period of the year lasts for 5.7 months, from April 29 to October 18. The least snow falls around August 6, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Mosfellsbær

Average Monthly Snowfall in MosfellsbærsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 inJan 1811.7 inJan 1811.7 inAug 60.0 inAug 60.0 inOct 181.0 inOct 181.0 inApr 291.0 inApr 291.0 in
The average snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Snowfall 11.7″10.9″8.4″2.5″0.1″0.0″0.0″0.0″0.0″0.9″4.3″10.2″

The length of the day in Mosfellsbær varies extremely over the course of the year. In 2024, the shortest day is December 21, with 4 hours, 6 minutes of daylight; the longest day is June 20, with 21 hours, 10 minutes of daylight.

Hours of Daylight and Twilight in Mosfellsbær

Hours of Daylight and Twilight in MosfellsbærJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 11 minMar 2012 hr, 11 minMar 2021 hr, 10 minJun 2021 hr, 10 minJun 2012 hr, 15 minSep 2212 hr, 15 minSep 224 hr, 6 minDec 214 hr, 6 minDec 21nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 5.5h8.6h11.9h15.2h18.6h20.9h19.5h16.3h12.9h9.7h6.4h4.3h

The earliest sunrise is at 2:53 AM on June 20, and the latest sunrise is 8 hours, 29 minutes later at 11:22 AM on December 24. The earliest sunset is at 3:27 PM on December 18, and the latest sunset is 8 hours, 36 minutes later at 12:03 AM on June 21.

Daylight saving time (DST) is not observed in Mosfellsbær during 2024.

Sunrise & Sunset with Twilight in Mosfellsbær

Sunrise & Sunset with Twilight in MosfellsbærJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 202:53 AMJun 202:53 AM12:03 AMJun 2112:03 AMJun 21Dec 183:27 PMDec 183:27 PM11:22 AMDec 2411:22 AMDec 24daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

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.

Solar Elevation and Azimuth in Mosfellsbær

Solar Elevation and Azimuth in MosfellsbærJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM0000101010202020303040000010101020203040249NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

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.

Moon Rise, Set & Phases in Mosfellsbær

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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 Mosfellsbær, 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, remaining a virtually constant 0% throughout.

Humidity Comfort Levels in Mosfellsbær

Humidity Comfort Levels in MosfellsbærJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 20%Jul 20%NowNowdrydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d

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 Mosfellsbær experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.2 months, from October 21 to April 26, with average wind speeds of more than 12.1 miles per hour. The windiest month of the year in Mosfellsbær is January, with an average hourly wind speed of 15.7 miles per hour.

The calmer time of year lasts for 5.8 months, from April 26 to October 21. The calmest month of the year in Mosfellsbær is July, with an average hourly wind speed of 8.3 miles per hour.

Average Wind Speed in Mosfellsbær

Average Wind Speed in MosfellsbærwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mphJan 716.0 mphJan 716.0 mphJul 208.2 mphJul 208.2 mphOct 2112.1 mphOct 2112.1 mphApr 2612.1 mphApr 2612.1 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 15.715.414.212.610.48.88.38.910.811.913.315.1

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

The wind is most often from the south for 6.0 days, from February 26 to March 3; for 6.0 days, from April 16 to April 22; and for 4.4 months, from May 7 to September 18, with a peak percentage of 33% on July 24. The wind is most often from the east for 1.4 months, from March 3 to April 16; for 2.1 weeks, from April 22 to May 7; and for 5.3 months, from September 18 to February 26, with a peak percentage of 32% on March 8.

Wind Direction in Mosfellsbær

Wind Direction in MosfellsbærEEESEJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Mosfellsbær 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 some seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.6 months, from June 23 to September 12, with an average temperature above 50°F. The month of the year in Mosfellsbær with the warmest water is August, with an average temperature of 52°F.

The time of year with cooler water lasts for 5.3 months, from November 26 to May 2, with an average temperature below 43°F. The month of the year in Mosfellsbær with the coolest water is March, with an average temperature of 41°F.

Average Water Temperature in Mosfellsbær

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 41°F41°F41°F42°F45°F49°F52°F52°F50°F47°F44°F42°F

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

Tourism Score in Mosfellsbær

Tourism Score in MosfellsbærJanFebMarAprMayJunJulAugSepOctNovDec002244668810102.92.90.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitation
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F.

Beach/Pool Score in Mosfellsbær

Beach/Pool Score in MosfellsbærJanFebMarAprMayJunJulAugSepOctNovDec002244668810100.00.00.00.0NowNowcloudscloudsprecipitationprecipitation
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Mosfellsbær typically lasts for 4.6 months (141 days), from around May 12 to around September 30, rarely starting before April 24 or after May 31, and rarely ending before September 9 or after October 20.

Time Spent in Various Temperature Bands and the Growing Season in Mosfellsbær

Time Spent in Various Temperature Bands and the Growing Season in Mosfellsbærgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 1250%May 1250%Sep 3050%Sep 3050%May 3190%May 3190%Sep 990%Sep 990%Apr 2410%Apr 2410%Oct 2010%Oct 2010%0%Dec 50%Dec 5Jul 21100%Jul 21100%NowNowfreezingvery coldcoldcoolfrigid
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing 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.

Based on growing degree days alone, the first spring blooms in Mosfellsbær should appear around July 14, only rarely appearing before June 29 or after August 6.

Growing Degree Days in Mosfellsbær

Growing Degree Days in MosfellsbærJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F50°F50°F100°F100°F150°F150°F200°F200°F250°F250°F300°F300°F350°F350°FJul 1490°FJul 1490°FDec 31241°FDec 31241°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

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 5 to July 31, with an average daily incident shortwave energy per square meter above 4.2 kWh. The brightest month of the year in Mosfellsbær is June, with an average of 5.2 kWh.

The darker period of the year lasts for 4.8 months, from October 10 to March 4, with an average daily incident shortwave energy per square meter below 1.1 kWh. The darkest month of the year in Mosfellsbær is December, with an average of 0.0 kWh.

Average Daily Incident Shortwave Solar Energy in Mosfellsbær

Average Daily Incident Shortwave Solar Energy in MosfellsbærbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhJun 165.3 kWhJun 165.3 kWhDec 200.0 kWhDec 200.0 kWhMay 54.2 kWhMay 54.2 kWhJul 314.2 kWhJul 314.2 kWhOct 101.1 kWhOct 101.1 kWhMar 41.1 kWhMar 41.1 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 0.10.61.63.14.75.24.73.62.10.90.20.0

For the purposes of this report, the geographical coordinates of Mosfellsbær are 64.167 deg latitude, -21.700 deg longitude, and 164 ft elevation.

The topography within 2 miles of Mosfellsbær contains very significant variations in elevation, with a maximum elevation change of 951 feet and an average elevation above sea level of 205 feet. Within 10 miles contains very significant variations in elevation (2,979 feet). Within 50 miles contains large variations in elevation (4,633 feet).

The area within 2 miles of Mosfellsbær is covered by artificial surfaces (30%), shrubs (29%), grassland (25%), and trees (11%), within 10 miles by shrubs (50%) and water (14%), and within 50 miles by water (46%) and shrubs (27%).

This report illustrates the typical weather in Mosfellsbær, 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 Mosfellsbær.

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

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Mosfellsbær and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.