MEAN MONTHLY TEMPERATURES IN PETERBOROUGH (Station A) SINCE JAN. 2010
Scroll down to see temperatures
(source: See Environment Canada:Canadian Climate Normals 1971-2000 http://tinyurl.com/3cvh8jrt and Daily Data Report for Peterborough Station A http://tinyurl.com/23yzzt37 Note that records for Station A are only available as of October, 2010. Prior to that, I have had to use the data from the Trent University Station on the edge of Peterborough )
From January 2010 through December 2023 116 of the 168 months (about 70%) have been warmer than the 1971 – 2000 Normal for each month. This is more than a 2:1 ratio for warmer versus cooler months. If the climate wasn’t warming, this ratio would be close to 1:1 over such a long period.
According to Environment Canada, the mean annual temperature in Peterborough for the 30 year period from 1971 to 2000 was 5.9 C. The mean annual temperatures for the past 14 years are as follows: 2010 (7.38 C), 2011 (7.24 C), 2012 (8.15 C), 2013 (6.4 C), 2014 (5.93 C), 2015 (6.35 C), 2016 (7.08 C), 2017 (6.8 C), 2018 (7.06 C), 2019 (5.79), 2020 (7.5 C), 2021 (7.6), 2022 (6.35) and 2023 (7.7). When added together and divided by 14, the mean annual temperature in Peterborough for the period from 2010 through 2023 was 6.95 C. In other words, Peterborough’s mean annual temperature for 2010-2020 was about 1 C warmer than the 1971 to 2000 mean.
The IPCC reported in October 2018 (summary here) that global warming must be limited to no more than 1.5 C. If warming exceeds this threshold, there is a strong likelihood that run-away, non-stoppable warming will result, fed by positive feedback loops like melting Arctic ice and permafrost. The bottom line is that Peterborough has already warmed to two-thirds of this maximum warming.
Temperature extremes
December 2015 showed the biggest departure (7.9 C ) from Normal (-5.3 C) for all months of December since at least 1968. In the summer of 2018, 28 days were above 30 C, according to data from Peterborough Trent U weather station. In 2020, this increased to 35 days above 30 C. The average for Peterborough in the 1990s was only 10 days above 30 C. In a climate projection report done for the City of Peterborough, 23 days above 30 C will be the norm by the 2030s.
Looking to the future
According to “Climate Change Research Report CCRR-44” by the Ontario Ministry of Natural Resources and Forestry (2015), winter temperatures in the Great Lakes Basin region, which includes the Kawarthas, are projected to increase, on average, by 2.5 to 2.8 C in the 2020s, 3.5 to 5.3 C by the 2050s, and 3.5 to 8.6 C by the 2080s. Summer temperatures are projected to increase, on average by 2.0 to 2.1 C in the 2020s, 2.6 to 4.4 C by the 2050s, and 2.7 to 7.5 C by the 2080s. Winter warming is likely to exceed summer warming.
Month | Normal (1971-2000) | Recorded | Difference | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 2024 | -5.3 C | ||||||||||
Nov. 2024 | 1.7 C | 4.1 C | 2.4C warmer | ||||||||
Oct. 2024 | 7.3 C | 8.7 C | 1.4C warmer | ||||||||
Sept. 2024 | 13.5 C | 16.0 C | 2.5C warmer | ||||||||
August 2024 | 18.2 C | 18.6 C | 0.4C warmer | ||||||||
July 2024 | 19.4 C | 20.8 C | 1.4C warmer | ||||||||
June 2024 | 16.8 C | 17.8 C | 1.0C warmer | ||||||||
May 2024 | 12.4 C | 14.3 C | 1.9C warmer | ||||||||
April 2024 | 5.7 C | 7.1 C | 1.4C warmer | ||||||||
March 2024 | -2.0 C | 2.3 C | 4.3C warmer | ||||||||
Feb. 2024 | -7.7 C | -2.4 C | 5.3C warmer | ||||||||
Jan. 2024 | -8.9 C | -3.7 C | 5.2C warmer | ||||||||
Dec. 2023 | -5.3 C | 0.4 C | 5.7 C warmer | ||||||||
Nov. 2023 | 1.7 C | 1.5 C | 0.2C cooler | ||||||||
Oct. 2023 | 7.3 C | 10.6 C | 3.3C warmer | ||||||||
Sept. 2023 | 13.5 C | 15.5 C | 2.0 C warmer | ||||||||
August 2023 | 18.2 C | 17.9 C | 0.3 C cooler | ||||||||
July 2023 | 19.4 C | 19.9 C | 0.5 C warmer | ||||||||
June 2023 | 16.8 C | 17.2 C | 0.4 C warmer | ||||||||
May 2023 | 12.4 C | 11.7 C | 0.7 C cooler | ||||||||
April 2023 | 5.7 C | 7.7 C | 2.0 C warmer | ||||||||
March 2023 | -2.0 C | -1.2 C | 0.8 C cooler | ||||||||
Feb. 2023 | -7.7 C | -4.8 C | 2.9 C warmer | ||||||||
Jan. 2023 | -8.9 C | -3.8 C | 5.1 C warmer | ||||||||
Dec. 2022 | -5.3 C | -2.8 C | 2.5 C warmer | ||||||||
Nov. 2022 | 1.7 C | 2.8 C | 1.1 C warmer | ||||||||
Oct. 2022 | 7.3 C | 7.6 C | 0.3 C warmer | ||||||||
Sept. 2022 | 13.5 C | 14.8 C | 1.3 C warmer | ||||||||
August 2022 | 18.2 C | 19.2 C | 1.0 C warmer | ||||||||
July 2022 | 19.4 C | 20.1 C (Trent U. station. Missing data at Ptbo A) | 0.7 C warmer | ||||||||
June 2022 | 16.8 C | 16.9 C | 0.1 C warmer | ||||||||
May 2022 | 12.4 C | 13.7 C | 1.3 C warmer | ||||||||
April 2022 | 5.7 C | 5.6 C | 0.1 C cooler | ||||||||
March 2022 | -2.0 C | -1.3 C | 0.7 C warmer | ||||||||
Feb. 2022 | -7.7 C | -7.9 C | 0.2C cooler | ||||||||
Jan. 2022 | -8.9 C | -12.5 C | 3.6C cooler | ||||||||
Dec. 2021 | -5.3 C | -1.3 C | 4.0C warmer | ||||||||
Nov. 2021 | 1.7 C | 1.5 C | 0.2C cooler | ||||||||
Oct. 2021 | 7.3 C | 12.3 C | 5.0C warmer | ||||||||
Sept. 2021 | 13.5 C | 14.8 C | 1.3C warmer | ||||||||
August 2021 | 18.2 C | 21.0 C | 2.8C warmer | ||||||||
July 2021 | 19.4 C | 19.0 C | 0.4 C cooler | ||||||||
June 2021 | 16.8 C | 18. 8 C | 2.0C warmer | ||||||||
May 2021 | 12.4 C | 11.6 C | 0.8 C cooler | ||||||||
April 2021 | 5.7 C | 6.6 C | 1.3C warmer | ||||||||
March 2021 | -2.0 C | 0.6 C | 2.6C warmer | ||||||||
Feb. 2021 | -7.7 C | -8.1 C | 0.4C cooler | ||||||||
Jan. 2021 | -8.9 C | -5.6 | 3.3C warmer | ||||||||
Dec. 2020 | -5.3 C | -2.4 | 2.9C cooler | ||||||||
Nov. 2020 | 1.7 C | 4.8 C | 3.1C warmer | ||||||||
Oct. 2020 | 7.3 C | 6.9 C | 0.4C cooler | ||||||||
Sept. 2020 | 13.5 C | 13.8 C | 0.3C warmer | ||||||||
August 2020 | 18.2 C | 19.2 C | 1.0C warmer | ||||||||
July 2020 | 19.4 C | 22.6 C | 3.2C warmer | ||||||||
June 2020 | 16.8 C | 18 C | 1.2C warmer | ||||||||
May 2020 | 12.4 C | 11.2 C | 1.2C cooler | ||||||||
April 2020 | 5.7 C | 4.2 C | 1.5 C cooler | ||||||||
March 2020 | -2.0 | 1.5 C | 3.5C warmer | ||||||||
February 2020 | -7.7 C | -5.2 C | 2.5C warmer | ||||||||
January 2020 | -8.9 C | -4.3 | 4.6C warmer | ||||||||
December 2019 | -5.3 C | -4.3 | 1.0C warmer | ||||||||
November 2019 | 1.7 C | -1.7 C | 3.4C cooler | ||||||||
October 2019 | 7.3 C | 8.1 C | 0.8C warmer | ||||||||
September 2019 | 13.5 C | 14.2 C | 0.7C warmer | ||||||||
August 2019 | 18.2 C | 17.9 C | 0.3 C cooler | ||||||||
July 2019 | 19.4 C | 20.9 C | 1.5C warmer | ||||||||
June 2019 | 16.8 C | 16.3 C | 0.5 C cooler | ||||||||
May 2019 | 12.4 C | 11.1 C | 1.3 C cooler | ||||||||
April 2019 | 5.7 C | 5.0 C | 0.7 C cooler | ||||||||
March 2019 | -2.0 C | -2.2 C | 0.2 C cooler | ||||||||
February 2019 | -7.7 C | -6.1 C | 1.6 C warmer | ||||||||
January 2019 | -8.9 C | -9.7 C | 0.8 C cooler | ||||||||
December 2018 | -5.3 C | -2.8 | 2.5 C warmer | ||||||||
November 2018 | 1.7 C | -0.9 | 2.6 C cooler | ||||||||
October 2018 | 7.3 C | 7.1 C | 0.2 C cooler | ||||||||
September 2018 | 13.5 C | 15.9 C | 2.4 C warmer | ||||||||
August 2018 | 18.2 C | 21.5 C (Trent U. station) | 3.3 C warmer | ||||||||
July 2018 | 19.4 C | 21.8 C (Trent U. station) | 2.4 C warmer | ||||||||
June 2018 | 16.8 C | 17.3 C | 0.5 C warmer | ||||||||
May 2018 | 12.4 C | 15.3 C | 2.9 C warmer | ||||||||
April 2018 | 5.7 C | 2.0 C | 3.7 C cooler | ||||||||
March 2018 | -2.0 C | -1.2 C | 0.8 C warmer | ||||||||
February 2018 | -7.7 C | -2.9 C | 4.8 C warmer | ||||||||
January 2018 | -8.9 C | -8.4 | 0.5 C warmer | ||||||||
December 2017 | -5.3 C | -9.1 C | 3.8 C cooler | ||||||||
November 2017 | 1.7 C | 1.4 C | 0.3 C cooler | ||||||||
October 2017 | 7.3 C | 10.5 C | 3.2 C warmer | ||||||||
September 2017 | 13.5 C | 16.1 C | 2.6 C warmer | ||||||||
August 2017 | 18.2 C | 16.7 C | 1.5 C cooler | ||||||||
July 2017 | 19.4 C | 19.3 C | 0.1 C cooler | ||||||||
June 2017 | 16.8 C | 16.9 C (Note: 129.9 mm of precipitation vs. 79.9 mm normal (1981 – 2010) | 0.1 C warmer | ||||||||
May 2017 | 12. 4 C | 12.1 C (Note: 187 mm of precipitation vs. 81.5 mm normal (1981 – 2010) | 0.3 C cooler | ||||||||
April 2017 | 5.7 C | 7.7 C (Note: 111.9 mm of precipitation vs. 68.6 mm normal (1981 – 2010) | 2.0 C warmer | ||||||||
March 2017 | -2.0 C | -2.9 C | 0.9 C cooler | ||||||||
February 2017 | -7.7 C | -3.0 C ( Trent University Station, since Ptbo Stn A data was incomplete) | 4.7 C warmer | ||||||||
January 2017 | -8.9 C | -4.1 C | 4.8 C warmer | ||||||||
December 2016 | -5.3 C | -5.2 C | 0.1 C warmer | ||||||||
November 2016 | 1.7 C | 3.6 C | 1.9 C warmer | ||||||||
October 2016 | 7.3 C | 8.4 C | 1.1 C warmer | ||||||||
September 2016 | 13.5 C | 15.3 C | 1.8 C warmer | ||||||||
August 2016 | 18.2 C | 21.9 C | 3.7 C warmer | ||||||||
July 2016 | 19.4 C | 20.8 C | 1.4 C warmer | ||||||||
June 2016 | 16.8 C | 17.1 C | 0.3 C warmer | ||||||||
May 2016 | 12. 4 C | 12.5 C | 0.1 C warmer | ||||||||
April 2016 | 5.7 C | 3.6 C | 2.1 C cooler | ||||||||
March 2016 | -2.0 C | -0.5 C | 1.5 C warmer | ||||||||
February 2016 | -7.7 C | -5.8 C | 1.9 C warmer | ||||||||
January 2016 | -8.9 C | -6.8 C | 2.1 C warmer | ||||||||
December 2015 | -5.3 C | 2.6 C | 7.9 C warmer | ||||||||
November 2015 | 1.7 C | 4.7 C | 3.0 C warmer | ||||||||
October 2015 | 7.3 C | 7.8 C | 0.5 C warmer | ||||||||
September 2015 | 13.5 C | 16.9 C | 3.4 C warmer | ||||||||
August 2015 | 18.2 C | 18.4 C | 0.2 C warmer | ||||||||
July 2015 | 19.4 C | 19.3 C | 0.1 C cooler | ||||||||
June 2015 | 16.8 C | 16.3 C | 0.5 C cooler | ||||||||
May 2015 | 12.4 C | 14.3 C | 1.9 C warmer | ||||||||
April 2015 | 5.7 C | 6.0 C | 0.3 C warmer | ||||||||
March 2015 | -2.0 C | -4.4 C | 2.2 C cooler | ||||||||
February 2015 | -7.7 C | -15.8 C | 8.1 C cooler | ||||||||
January 2015 | -8.9 C | -9.9 C | 1.0 C cooler | ||||||||
December 2014 | -5.3 C | -2.4 C | 2.9 C warmer | ||||||||
November 2014 | 1.7 C | 0.8 C | 0.9 C cooler | ||||||||
October 2014 | 7.3 C | 9.2 C | 1.9 C warmer | ||||||||
September 2014 | 13.5 C | 14.1 C | 0.6 C warmer | ||||||||
August 2014 | 18.2 C | 17.6 C | 0.6 C cooler | ||||||||
July 2014 | 19.4 C | 18.2 C | 1.2 C cooler | ||||||||
June 2014 | 16.8 C | 17.7 C | 0.9 C warmer | ||||||||
May 2014 | 12.4 C | 13.6 C | 1.2 C warmer | ||||||||
April 2014 | 5.7 C | 5.3 C | 0.4 C cooler | ||||||||
March 2014 | -2.0 C | – 7.3 C | 5.3 C cooler | ||||||||
February 2014 | -7.7 C | -11.5 C | 3.8 C cooler | ||||||||
January 2014 | -8.9 C | -9.9 C | 1.0 C cooler | ||||||||
December 2013 | -5.3 C | -7.4 C | 2.1 C cooler | ||||||||
November 2013 | 1.7 C | 0.1 C | 1.6 C cooler | ||||||||
October 2013 | 7.3 C | 9.1 C | 1.8 C warmer | ||||||||
September 2013 | 13.5 C | 13.8 C | 0.3 C warmer | ||||||||
August 2013 | 18.2 C | 18.2 C | 0 | ||||||||
July 2013 | 19.4 C | 20.4 C | 1.0 C warmer | ||||||||
June 2013 | 16.8 C | 17.0 C | 0.2 C warmer | ||||||||
May 2013 | 12.4 C | 13.7 C | 1.3 C warmer | ||||||||
April 2013 | 5.7 C | 5.0 C | 0.7 C cooler | ||||||||
March 2013 | -2.0 C | -1.2 C | 0.8 C warmer | ||||||||
February 2013 | -7.7 C | – 7.0 C | 0.7 C warmer | ||||||||
January 2013 | -8.9 C | -4.7 C | 4.2 C warmer | ||||||||
December 2012 | -5.3 C | -1.6 C | 3.7 C warmer | ||||||||
November 2012 | 1.7 C | 1.7 C | 0 | ||||||||
October 2012 | 7.3 C | 8.6 C | 1.3 C warmer | ||||||||
September 2012 | 13.5 C | 13.2 C | 0.3 C cooler | ||||||||
August 2012 | 18.2 C | 18.5 C | 0.3 C warmer | ||||||||
July 2012 | 19.4 C | 20.8 C | 1.4 C warmer | ||||||||
June 2012 | 16.8 C | 18.2 C | 1.4 C warmer | ||||||||
May 2012 | 12.4 C | 14.2 C | 1.8 C warmer | ||||||||
April 2012 | 5.7 C | 5.9 C | 0.2 C warmer | ||||||||
March 2012 | – 2.0 C | 5.0 C | 7.0 C warmer | ||||||||
February 2012 | -7.7 C | -2.5 C | 5.2C warmer | ||||||||
January 2012 | -8.9 C | -4.2 C | 4.7 C warmer | ||||||||
December 2011 | -5.3 C | -1.4 C | 3.9 C warmer | ||||||||
November 2011 | 1.7 C | 4.3 C | 2.6 C warmer | ||||||||
October 2011 | 7.3 C | 9.2 C | 1.9 C warmer | ||||||||
September 2011 | 13.5 C | 16.2 C | 2.7 C warmer | ||||||||
August 2011 | 18.2 C | 19.1 C | 0.3 C warmer | ||||||||
July 2011 | 19.4 C | 20.9 C | 1.4 C warmer | ||||||||
June 2011 | 16.8 C | 17.6 C | 1.4 C warmer | ||||||||
May 2011 | 12.4 C | 13.6 C | 1.8 C warmer | ||||||||
April 2011 | 5.7 C | 5.9 C | 0.2 C warmer | ||||||||
March 2011 | -2.0 C | -1.6 C | 0.4 C warmer | ||||||||
February 2011 | -7.7 C | -7.0 C | 0.7 C warmer | ||||||||
January 2011 | -8.9 C | -9.9 C | 1.0 C cooler | ||||||||
December 2010 | -5.3 C | -6.1 C | 0.8 C cooler | ||||||||
November 2010 | 1.7 C | 2.7 C | 1.0 C warmer | ||||||||
October 2010 | 7.3 C | 8.4 C | 1.1 C warmer | ||||||||
September 2010 | 13.5 C | 14.4 C (Trent U. Weather Station) | 0.9 C warmer | ||||||||
August 2010 | 18.2 C | 19.6 C (Trent U. Weather Station) | 1.4 C warmer | ||||||||
July 2010 | 19.4 C | 21.8 C (Trent U. Weather Station) | 2.4 C warmer | ||||||||
June 2010 | 16.8 C | 17.7 C (Trent U. Weather Station) | 0.9 C warmer | ||||||||
May 2010 | 12.4 C | 14.1 C (Trent U. Weather Station) | 1.7 C warmer | ||||||||
April 2010 | 5.7 C | 9.6 C (Trent U. Weather Station) | 3.9 C warmer | ||||||||
March 2010 | -2.0 C | 2.9 C (Trent U. Weather Station) | 4.9 C warmer | ||||||||
February 2010 | -7.7 C | -5.2 C (Trent U. Weather Station) | 2.5 C warmer | ||||||||
January 2010 | -8.9 C | -7.6 C (Trent U. Weather Station) | 1.3 C warmer | ||||||||