Blue Hill Observatory May 2021 Summary: May was generally warmer and wetter than average. The 24-hour adjusted mean temperature for the month of 57.7 deg F was 2.2 degrees warmer than the 1891-2020 130-year average for May, and it was 1.0 degrees warmer than the 1981-2010 30-year average. The average maximum temperature of 68.1 deg […]
Blue Hill Observatory April 2021 Summary: April was warmer and much sunnier than average. The 24-hour adjusted mean temperature for the month of 47.0 deg F was 2.1 degrees warmer than the 1891-2020 130-year average for April, and it was 0.7 degrees warmer than the 1981-2010 30-year average. The average maximum temperature of 57.2 deg […]
Blue Hill Observatory March 2021 Summary: March was warmer, drier, less snowy, and much sunnier than average. The 24-hour adjusted mean temperature for the month of 39.2 deg F was 4.7 degrees warmer than the 1891-2020 130-year average for March, and it was 3.4 degrees warmer than the 1981-2010 30-year average. The average maximum temperature […]
Blue Hill ObservatoryWinter 2020-2021 Summary: The winter (December-February) season was generally warm with a few cold periods and with above average precipitation and snowfall. The 24-hour mean temperature for the winter of 30.5 deg F was 3.0 degrees warmer than the 130-year winter average and 1.5 degrees warmer than the 1981-2010 30-year average. The average […]
Blue Hill Observatory February 2021 Summary: February was warmer, wetter and much snowier than average. The 24-hour adjusted mean temperature for the month of 28.8 deg F was 2.2 degrees warmer than the 1891-2020 130-year average for February, but it was 0.3 degrees cooler than the 1981-2010 30-year average. The average maximum temperature of 35.2 […]
Blue Hill Observatory January 2021 Summary: January was generally warmer, drier and less snowy than average. The 24-hour adjusted mean temperature for the month of 28.8 deg F was 2.9 degrees warmer than the 1891-2020 130-year average for January, and it was 2.6 degrees warmer than the 1981-2010 30-year average. The average maximum temperature of […]
This report is an updated summary of the extensive annual and seasonal climate records of the Blue Hill Observatory that also documents the changes that have occurred in several key parameters over the entire period of record. This document is also available as a downloadable PDF file.
The year 2020 ended as the second warmest on record with a 24-hour adjusted mean temperature of 51.3F, which was 3.7F warmer than the 120-year (1891-2010) long-term mean and 2.4F above the 30-year (1981-2010) normal. The only warmer year was 2012 with a mean of 51.7F. The annual average maximum temperature of 60.4F was 3.5F […]
Blue Hill Observatory December 2020 Summary: December was warmer, wetter, cloudier and snowier than average. The 24-hour adjusted mean temperature for the month of 34.0 deg F was 4.2 degrees warmer than the 120-year average for December, and it was 2.4 degrees warmer than the 1981-2010 30-year average. The average maximum temperature of 41.1 deg […]
Blue Hill Observatory November 2020 Summary: November was unseasonably warm and both wetter and sunnier than average. The 24-hour adjusted mean temperature for the month of 46.9 deg F was 6.3 degrees warmer than the 120-year average for November, and it was 4.8 degrees warmer than the 1981-2010 30-year average. November was the fourth warmest […]
Blue Hill Observatory October 2020 Summary: October was warm and wet with one very snowy day. The 24-hour adjusted mean temperature for the month of 52.7 deg F was 1.6 degrees warmer than the 120-year average for October, and it was 1.3 degrees warmer than the 1981-2010 30-year average. The average maximum temperature of 61.2 […]
Blue Hill Observatory September 2020 Summary: September was warm and generally dry with above average sunshine. The 24-hour adjusted mean temperature for the month of 63.6 deg F was 2.4 degrees warmer than the 120-year average for September, and it was 1.5 degrees warmer than the 1981-2010 30-year average. The average maximum temperature of 73.2 […]
Blue Hill Observatory August 2020 Summary: August was unusually warm and generally dry with above average sunshine. The 24-hour adjusted mean temperature for the month of 72.3 deg F was 4.2 degrees warmer than the 120-year average for August, and it was 2.9 degrees warmer than the 1981-2010 30-year average. The month tied with 2005 […]
Blue Hill Observatory July 2020 Summary: July was unusually warm and generally dry with near average sunshine. The 24-hour adjusted mean temperature for the month of 73.6 deg F was 3.9 degrees warmer than the 120-year average for July, and it was 2.8 degrees warmer than the 1981-2010 30-year average. The month tied for the […]
Blue Hill Observatory June 2020 Summary: June was unusually warm and wet with more sunshine than average. The 24-hour adjusted mean temperature for the month of 67.5 deg F was 3.4 degrees warmer than the 120-year average for June, but it was just 2.2 degrees warmer than the 1981-2010 30-year average. The month was the […]
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