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Has the climate in Caledon changed?

Caledon has warmed about 2.1°F between 1971 and 2015.

About 0.5°F per decade, measured from Caledon's official daily weather records, 1971–2015. Individual years still bounce around — some recent ones came in cool — but the long-term line has clearly risen.

Is that a lot? Caledon's warming is broadly in line with other cities in Canada — neither unusually fast nor unusually slow.

What has actually changed

Each card compares the 1970s (the first ten years of the record) with recent years (the last ten) — the same span the headline and the chart use.

Average temperature
+1.6°F
1970s
42.2°F
Recent
43.8°F
A steady upward drift

Caledon's temperature, year by year

Average temperature for each year from 1971 to 2015.

38°40°42°44°46°48°50°1971: 42.6°F1972: 40.6°F1973: 44.4°F1974: 42.7°F1975: 43.6°F1976: 39.3°F1977: 42.6°F1978: 41.0°F1979: 41.9°F1980: 41.1°F1981: 42.5°F1982: 42.1°F1983: 43.5°F1984: 42.5°F1985: 42.7°F1986: 43.5°F1987: 45.0°F1988: 43.4°F1989: 41.6°F1990: 44.9°F1991: 45.1°F1992: 41.7°F1993: 41.8°F1994: 42.0°F1995: 42.8°F1996: 41.8°F1997: 42.3°F1998: 48.0°F1999: 45.2°F2000: 43.6°F2001: 45.3°F2002: 45.0°F2003: 42.7°F2004: 42.8°F2005: 44.1°F2006: 45.9°F2007: 44.3°F2008: 42.8°F2009: 42.9°F2010: 45.1°F2011: 43.5°F2012: 46.1°F2013: 43.3°F2014: 40.8°F2015: 43.0°Flong-term trend197119801990200020102015
a warmer-than-average year a cooler-than-average year

Each bar is one year. Most recent years sit above the older ones. Some recent years still came in cool — warming is a slope, not a straight climb.

When in the year the change shows up

How much warmer each month is now than in the 1970s. Useful if you garden or care about a particular season — otherwise the headline above already has the answer.

0.0°+0.5°+1.0°+1.5°+2.0°January: +1.1°F+1.1JFebruary: +0.2°F+0.2FMarch: +0.6°F+0.6MApril: +0.6°F+0.6AMay: +0.1°F+0.1MJune: +1.1°F+1.1JJuly: +0.3°F+0.3JAugust: +0.5°F+0.5ASeptember: +0.8°F+0.8SOctober: +0.6°F+0.6ONovember: +0.7°F+0.7NDecember: +2.0°F+2.0D

December has warmed the most — about 2.0°F. The warming runs across the whole year, not just one season.

Methodology & sources

Temperature — 1991–2020 normals computed from 24 years of daily observations at Orangeville Moe, a weather station, about 10 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →