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Has the climate in Clayton changed?

Clayton has warmed about 0.7°F between 2003 and 2019.

About 0.5°F per decade, measured from Clayton's official daily weather records, 2003–2019. Individual years still bounce around — some recent ones came in cool — but the long-term line has clearly risen.

Is that a lot? Clayton's warming is broadly in line with other cities in United States — 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.

Freezing nights
5 more nights
1970s
131 / yr
Recent
136 / yr
Colder winters — more frosts
Average temperature
+0.4°F
1970s
53.4°F
Recent
53.9°F
A steady upward drift
Hot days above 90°F
16 more days
1970s
36 / yr
Recent
52 / yr
More days of serious heat
Rainy days
7 fewer days
1970s
67 / yr
Recent
60 / yr
Drier on average

Clayton's temperature, year by year

Average temperature for each year from 2003 to 2019.

48°50°52°54°56°2003: 54.2°F2004: 53.2°F2005: 53.0°F2006: 53.7°F2007: 53.1°F2008: 49.8°F2009: 52.8°F2010: 54.3°F2011: 55.1°F2013: 54.2°F2014: 53.4°F2015: 55.7°F2017: 53.7°F2018: 53.6°F2019: 52.8°Flong-term trend200320102019
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.

In day-to-day terms, that long-term shift shows up as about 80 more freezing nights a year and about 17 more days above 90°F compared with the 1970s.

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.

-7.0°-6.5°-6.0°-5.5°-5.0°-4.5°-4.0°-3.5°-3.0°-2.5°-2.0°-1.5°-1.0°-0.5°0.0°+0.5°+1.0°January: -1.9°F-1.9JFebruary: -3.4°F-3.4FMarch: -2.2°F-2.2MApril: +1.0°F+1.0AMay: -2.7°F-2.7MJune: -2.7°F-2.7JJuly: -2.8°F-2.8JAugust: -1.5°F-1.5ASeptember: -6.7°F-6.7SOctober: -1.7°F-1.7ONovember: -5.1°F-5.1NDecember: -2.9°F-2.9D

September has cooled the most — about 6.7°F. The warming runs across the whole year, not just one season.

Methodology & sources

Temperature — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Clayton 1 N (NOAA GHCN station USC00291883), about 2 km from the city centre.

How we build these numbers →