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Has the climate in San Pedro changed?

San Pedro has warmed about 1.3°F between 1971 and 2012.

About 0.3°F per decade, measured from San Pedro's official daily weather records, 1971–2012. Individual years still bounce around — some recent ones came in cool — but the long-term line has clearly risen.

Is that a lot? San Pedro's warming is broadly in line with other cities in Mexico — 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
2 fewer nights
1970s
10 / yr
Recent
8 / yr
Milder winters — fewer frosts
Average temperature
+0.9°F
1970s
69.7°F
Recent
70.6°F
A steady upward drift
Hot days above 90°F
8 fewer days
1970s
154 / yr
Recent
146 / yr
Slightly fewer hot days
Rainy days
5 fewer days
1970s
23 / yr
Recent
18 / yr
Drier on average

San Pedro's temperature, year by year

Average temperature for each year from 1971 to 2012.

65°67°69°71°73°75°1971: 70.5°F1972: 71.0°F1973: 68.5°F1974: 70.4°F1975: 69.3°F1976: 67.6°F1977: 70.2°F1978: 69.9°F1979: 68.7°F1980: 69.5°F1981: 69.7°F1982: 72.0°F1983: 69.5°F1984: 69.2°F1985: 69.7°F1986: 69.4°F1987: 68.0°F1988: 69.3°F1989: 70.3°F1990: 70.6°F1991: 69.7°F1992: 68.8°F1993: 69.7°F1994: 71.3°F1995: 70.3°F1996: 69.9°F1997: 68.4°F1998: 70.8°F1999: 70.3°F2000: 70.6°F2001: 70.8°F2002: 70.6°F2003: 70.2°F2004: 71.0°F2005: 73.2°F2006: 71.1°F2007: 71.6°F2008: 66.3°F2009: 69.2°F2010: 69.7°F2011: 72.2°F2012: 71.8°Flong-term trend197119801990200020102012
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 8 fewer 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.

-0.5°0.0°+0.5°+1.0°January: +0.8°F+0.8JFebruary: +1.0°F+1.0FMarch: -0.2°F-0.2MApril: +0.4°F+0.4AMay: +0.8°F+0.8MJune: +0.4°F+0.4JJuly: +0.4°F+0.4JAugust: +0.9°F+0.9ASeptember: +0.3°F+0.3SOctober: +0.9°F+0.9ONovember: +0.2°F+0.2NDecember: +0.4°F+0.4D

February has warmed the most — about 1.0°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 San Pedro, about 1 km from the city centre.

How we build these numbers →