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• The average sea tempeature is 3 °C (37.4 °F).
• The average temperature in Reykjavík in December is slightly cold at -0.2 °C (31.64 °F).
• Afternoons can be very cool with average high temperatures reaching 2 °C (35.6 °F).
• Overnight temperatures are generally slightly cold with an average low of -2 °C (28.4 °F).
• The mean diurnal temperature range/ variation in December is 4 °C (7.2 °F).
• The weather in December is somewhat dry with periodic periods of snow. Just 78.7mm (3.1in) of water is discharged across on average 20 days.
• In December the skies in Reykjavík are almost rayless with on balance a grim 0:17 of intense sunlight daily.
• The shortest day is 4:12 long and the longest day is 5:07 long with an average length of 4:28.
• There are approximately 3:30 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
• It is sunny approximately 7.6% of daylight hours and cloudy 92.4% of daylight hours.

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Weather Trend Graph for December in Reykjavík, Iceland

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