![]() ![]() ![]() ![]() Turbulence combined with temperature differences in the atmosphere. Planets might look like they are under a layer of rippling water and show little detail at any magnification, but the view of galaxies is The line, labeled Seeing, forecasts astronomical seeing. So see the separate smoke forecast line on this chart.ĬMC's text page explaining the transparency forecast is So it mayīe possible to observe during a white transparency forecast, but the real transparency is usually yucky. Large globulars and planets can be observed in poorĪ forecast color of white formally means that CMC didn't compute the transparency forecast because the cloud cover was over 30%. ![]() However, open clustersĪnd planetary nebulae are quite observable in below average transparency. It is somewhat independant of the cloud cover forecast in that there can be isolated clouds in a transparent air mass, and poor transparency can occurĪbove average transparency is necessary for good observation of low contrast objects like galaxies and nebulae. It's calculated from the total amount of water vapor in theĪir. The total transparency of the atmosphere from ground to space. Here 'transparency' means just what astronomers mean The line, labeled Transparency, forecasts the transparency of the air. It's always wise to click on a colored block for the hour you want to observe and see if your location is close to a cloud edge.ĬMC's text page explaining this forecast is Is 76% and the mostly-cloudy accuracy is 89%. When the forecast is predicting 36 to 48 hours into the future, the mostly-clear accuracy Mostly-clear forecasts (cloud75%) have been When the forecast is clear, the sky may still be hazy, if the transparency forecast is poor.Īccuracy averaged over North America for a 30 day period: when the forecast is predicting less than 12 hours into the future, This forecast may miss low cloud and afternoon thunderstorms. Lighter shades of blue are increasing cloudiness and white is overcast. The colors are picked from what color the sky is likely to be, with The line, labeled Cloud Cover forecasts total cloud cover. Connected blocks mean one forecast calculation for several hours. (Local time for Bar Harbor is -4.0 hours from GMT.) Single blocks mean separate forecast data for each hour. A digit 1 on top of a 3 means 13:00 or 1pm. The two numbers at the top of a column is the time. The colors of the blocks are the colors from CMC's forecast maps for that hour. Summary: In the rows labeled "Sky", find a column of blue blocks. Summarizes CMC's forecast images just for Bar HarborĪnd the surroundings out to about 10 miles. So, Attilla Danko wrote a script to generate the images like the one above It can be a chore to find the one map that tells you if you can observe tonight. CMC's numerical weather forecasts are unique because they are specifically designed for astronomers.īut they have 1180 forecast maps. The data comes from a forecast model developed by Allan Rahill of theĬanadian Meteorological Centre. It's a prediction of when Bar Harbor, ME, will have good weather for astronomical observing. At a glance, it shows when it will be cloudy or clear for the Of course, winter is the least popular time to come to Mount Desert Island and Bar Harbor, but folks still show up to experience the magical beauty of winter in Maine.ĭecember, January and February have average highs in the 30s and lows in the teens.It's the astronomer's forecast. When you check the Bar Harbor weather forecast in the winter, you’ll find reports of freezing rain and low temperatures. November is the wettest month of the year, with an average rainfall of 6.42 inches. Winds bring quite a chill, so be ready.įall temperatures have highs in the 70s falling to the 30s or 40s at night. It’s a wonderful time to visit to avoid tourists and to witness the incredible fall colors. The fall season brings cooler Bar Harbor, ME weather, and the summer crowds grow thin. There’s a little humidity and rainstorms do come in fairly frequently, so you should be prepared.īar Harbor temperatures range from the mid 70s to low 80s as pleasantly warm highs and 40 to 50 degrees at night. The warm and sunny climate in Bar Harbor in the summertime makes it the ideal time to come to Maine and Mount Desert Island. Temperatures in the spring are in the 60s and 70s by day and down to 30 degrees at night. However, this is when the trees are getting new leaves and the flowers are blooming, making it an exceptional time to visit. Always be prepared, however, for a variety of weather conditions as the climate can be unpredictable.īar Harbor, Maine weather in the spring months often is rainy and cool, with some fog rolling in. When coming to this area, you should become familiar with the weather for the season you plan to arrive so you know how to prepare. Bar Harbor lies along the Atlantic Seacoast on Mount Desert Island, which includes Acadia National Park and a number of historic sites to visit. ![]()
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