June 2018 Summary – Drier and Cloudier Than Average

Blue Hill Observatory

June 2018 Summary:

June temperature was close to normal while rainfall and sunshine were less than average. The 24-hour adjusted mean temperature for the month of 65.7 deg F was 1.6 degrees warmer than the 120-year average for June and about a half degrees warmer than the 1981-2010 30-year average. The average of the mean maximum and minimum temperatures for June was slightly cooler than the 30-year normal. The highest temperature for the month was 90F on the 30th, and the coldest temperature was 45F on the 3rd and 4th. A total of 2.85 inches of precipitation was measured, which was 0.84 inches less than the long-term 120-year average and about one and a half inches less than the 30-year mean. The greatest precipitation in 24 hours was 1.29 inches on the 27th-28th. There were four thunderstorm days during June, average for the month, which brought the annual total up to six. The mean wind speed for June was 10.8 mph, and the prevailing direction was from the south-southwest. A peak gust of 37 mph from the southwest occurred on the 12th. June was cloudier than average with a total of 223.4 hours of bright sunshine, or 51 percent of possible, which was four percent less than the long-term mean.

Mike Iacono
Chief Scientist
Blue Hill Observatory