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Has the climate in Joliette changed?

Joliette has cooled about 1°F between 1971 and 2018.

About 0.2°F per decade, measured from Joliette's official daily weather records, 1971–2018. Individual years still bounce around — some recent ones came in cool — but the long-term line has clearly risen.

Is that a lot? Joliette's climate has warmed more slowly than most other cities in Canada.

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
−0.4°F
1970s
40.5°F
Recent
40.1°F
A small downward drift

Joliette's temperature, year by year

Average temperature for each year from 1971 to 2018.

19°21°23°25°27°29°31°33°35°37°39°41°43°45°47°49°51°53°1971: 40.8°F1972: 39.5°F1973: 43.3°F1974: 40.2°F1975: 42.8°F1976: 39.7°F1977: 42.2°F1978: 40.9°F1979: 42.6°F1980: 39.8°F1981: 42.0°F1982: 31.3°F1983: 42.6°F1984: 41.6°F1985: 40.1°F1986: 39.6°F1987: 37.5°F1988: 41.6°F1989: 39.9°F1990: 43.4°F1991: 43.3°F1992: 40.5°F1993: 40.6°F1994: 41.3°F1995: 42.7°F1996: 41.5°F1997: 39.4°F1998: 52.5°F1999: 43.8°F2000: 41.2°F2001: 43.2°F2002: 41.3°F2003: 37.0°F2004: 39.1°F2005: 42.3°F2006: 44.1°F2007: 43.0°F2008: 41.6°F2009: 41.4°F2010: 45.4°F2011: 37.0°F2012: 49.0°F2013: 44.3°F2014: 42.3°F2015: 21.0°F2016: 39.5°F2017: 42.6°F2018: 32.5°Flong-term trend197119801990200020102018
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.

-0.5°0.0°+0.5°+1.0°+1.5°+2.0°+2.5°January: +1.6°F+1.6JFebruary: +0.1°F+0.1FMarch: -0.3°F-0.3MApril: +0.0°F+0.0AMay: +0.5°F+0.5MJune: +1.0°F+1.0JJuly: +0.1°F+0.1JAugust: +0.6°F+0.6ASeptember: +1.9°F+1.9SOctober: +2.3°F+2.3ONovember: +1.1°F+1.1NDecember: +2.5°F+2.5D

December has warmed the most — about 2.5°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 ST Jacques, a weather station, about 14 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →