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Has the climate in Tepexpan changed?

Tepexpan has cooled about 1.7°F between 1971 and 2002.

About 0.6°F per decade, measured from Tepexpan's official daily weather records, 1971–2002. Individual years still bounce around — some recent ones came in cool — but the long-term line has clearly risen.

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

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
20 fewer nights
1970s
45 / yr
Recent
25 / yr
Milder winters — fewer frosts
Average temperature
−1.4°F
1970s
59.2°F
Recent
57.8°F
A small downward drift
Hot days above 90°F
14 more days
1970s
4 / yr
Recent
18 / yr
More days of serious heat
Rainy days
12 fewer days
1970s
103 / yr
Recent
91 / yr
Drier on average

Tepexpan's temperature, year by year

Average temperature for each year from 1971 to 2002.

54°56°58°60°62°64°1971: 59.2°F1972: 59.4°F1973: 59.2°F1974: 58.9°F1975: 58.8°F1976: 58.6°F1977: 59.2°F1978: 59.4°F1979: 59.8°F1980: 60.8°F1981: 60.2°F1982: 60.7°F1983: 60.3°F1984: 59.7°F1985: 59.7°F1986: 59.3°F1987: 59.5°F1988: 59.8°F1991: 56.8°F1993: 57.9°F1994: 57.7°F1995: 57.7°F1996: 57.8°F1997: 56.9°F1998: 55.0°F1999: 62.2°F2002: 58.1°Flong-term trend197119802002
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 12 fewer freezing nights a year and about 4 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.

-2.5°-2.0°-1.5°-1.0°-0.5°0.0°+0.5°+1.0°+1.5°January: +0.4°F+0.4JFebruary: +1.5°F+1.5FMarch: +0.3°F+0.3MApril: -0.5°F-0.5AMay: -1.4°F-1.4MJune: -2.3°F-2.3JJuly: -1.4°F-1.4JAugust: -2.0°F-2.0ASeptember: -2.0°F-2.0SOctober: -2.2°F-2.2ONovember: -1.4°F-1.4NDecember: -0.8°F-0.8D

June has cooled the most — about 2.3°F. The warming runs across the whole year, not just one season.

Methodology & sources

Temperature — the official 1991–2020 climate normals from CONAGUA / SMN, Mexico's national weather service, measured at Atenco, about 8 km from the city centre.

How we build these numbers →