Sunpath:
At the Fall and Spring Solstice, the sun rises just before 6:00 AM and sets just after 6:00 PM and rises to an ultimate height of 47 degrees above the horizon. At the Winter Solstice, the sun rises at approximately 7:30 AM and sets at approximately 4:30 PM, rising to 24 degrees above the horizon. At the Summer Solstice, the sun rises at approximately 4:30 AM and sets at approximately 7:30 PM, rising to 72 degrees above the horizon.
Wind Rose:
Boston seems on average to have wind consistently from all directions over the year. In the winter months (January through March), most wind comes from the East and West, with the majority coming from the northwest. In the spring (March through June), the wind is mostly from the west. In summer, June through September, the wind comes from all directions, with strong winds from the northeast. In fall, September through December, the wind is very strong from all directions except the southeast.
The wind temperature year-round is between 35 and 70 degrees. Monthly, the wind temperature is between 35 and 70 from the east except for July, when it raises to 70 to 75 degress. The temperature from the west varies throughout the year, from below 32 degrees in January to 75 to 100 degrees in June, July, and August. Most humidity comes from the east winds, due to the Atlantic Ocean.
Temperature and Relative Humidity Range:
The January design temperature low is 5 degrees, and in July the design temperature high is 92. The monthly means of relative humidity hovers around 67% for all but 3 months of the year, February, March and May, when it is around 60%.
Wind Speed and Direction:
Wind speeds are fairly consistent year round, monthly means staying between 10 and 15 mph, with the stronger winds in the winter months. Mean wind direction is from the south west.
Sunshine:
Annually, Boston sees an average 58% sunshine, although the average low percentage of sun is approximately 22% and the average high percentage of sun is 92%.
Psychrometric Chart:
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