About 0.0°F per decade, measured from Arica's official daily weather records, 1974–2020. Individual years still bounce around — some recent ones came in cool — but the long-term line has clearly risen.
Is that a lot? Arica's warming is broadly in line with other cities in Chile — 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
about the same
1970s
0 / yr
→
Recent
0 / yr
Winters about as cold as before
Average temperature
−0.4°F
1970s
66.9°F
→
Recent
66.5°F
A small downward drift
Hot days above 90°F
about the same
1970s
0 / yr
→
Recent
0 / yr
About the same number of heat days
Rainy days
12 fewer days
1970s
14 / yr
→
Recent
2 / yr
Drier on average
Arica's temperature, year by year
Average temperature for each year from 1974 to 2020.
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.
November has cooled the most — about 2.1°F. The warming runs across the whole year, not just one season.
Methodology & sources
Temperature — the official 1991–2020 climate normals from the WMO's CLINO 1991–2020 collection, measured at Chacallutaaeropuertoarica, about 14 km from the city centre.