![]() The NAO results from the interaction between a semi-permanent low pressure system over Iceland (the Icelandic Low) and a semi-permanent high pressure system over Bermuda (the Bermuda High). Long-term weather trends in Acadia National Park are also influenced by a weather system known as the North Atlantic Oscillation (NAO). In January, February and March, when inland Maine often suffers sub-zero temperatures, the ocean’s relative warmth boosts temperatures along the coast. In June, July and August, when inland Maine is hot and humid, the Gulf of Maine’s cold water keeps Acadia’s temperatures mild. Temperatures in Maine can vary dramatically throughout the year, but temperatures along the coast are moderated by the ocean. Any report over 36 hours is pretty much useless.Īcadia weather – even when it's bad, it's good #Acadia #AcadiaNationalPark #Maine #DowneastĪ post shared by James Kaiser on at 1:11pm PDT In my highly non-scientific study of local forecasts, I’ve found that 24-hour reports are right about 70% of the time, 48-hour reports are right about 50% of the time, and 36-hour reports are right about 30% of the time. ![]() Most are based on regional forecasts, and there’s tremendous variability within the region. But in my experience, even their forecasts are only partially reliable. My favorite source of forecasts and weather info is the National Weather Service. See also: Best Times to Visit Acadia National Park Acadia Weather Forecasts I don’t know who makes that, but I think it must be some raw apprentices in the weather-clerk’s factory.” As Mark Twain once wrote, “I reverently believe that the Maker who made us all makes everything in New England but the weather. Weather patterns in Maine - and all of New England for that matter - are more variable and extreme than almost any other place the United States. What started out as a sunny day in Bar Harbor can end in rain, fog or (in rare cases) hail. Although summers on Mount Desert Island are generally sunny and divine, conditions can change in an instant. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.Weather in Acadia National Park is - in a word - unpredictable. On bright days sunglasses that block both UVA and UVB rays should be worn. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Light skin individuals may get burned in less than 30 minutes. Note: In August, the average maximum UV index of 5 translate into the following recommendations: A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person. UV indexJune through August, with an average maximum UV index of 5, are months with the highest UV index. SunshineThe month with the most sunshine is August, with an average of 10.1h of sunshine. On the last day of the month, sunrise is at 5:54 am and sunset at 7:11 pm EDT. On the first day of August in Bar Harbor, sunrise is at 5:19 am and sunset at 7:58 pm. Daylight In August, the average length of the day is 13h and 59min. Unprotected immersion in temperatures below 50☏ (10☌) causes quickly maximum intensity cold shock with hyperventilation. Note: Swimming in 56.8☏ (13.8☌) is considered dangerous. Ocean temperatureThe month with the warmest seawater in Bar Harbor is August, with an average ocean temperature of 56.8☏ (13.8☌). Snowfall June through September are months without snowfall. In Bar Harbor, during the entire year, the rain falls for 142.1 days and collects up to 32.28" (820mm) of precipitation. Rainfall In Bar Harbor, during August, the rain falls for 10.4 days and regularly aggregates up to 1.73" (44mm) of precipitation. HumidityIn Bar Harbor, the average relative humidity in August is 80%. TemperatureWith an average high-temperature of 73.4☏ (23☌) and an average low-temperature of 57.7☏ (14.3☌), August is the warmest month. The last month of the summer, August, is a moderately hot month in Bar Harbor, Maine, with an average temperature fluctuating between 73.4☏ (23☌) and 57.7☏ (14.3☌).
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