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Has the climate in Selfoss changed?
Selfoss has warmed about 2°F since 1971.
About 0.4°F per decade, measured from Selfoss's official daily weather records, 1971–2025. Individual years still bounce around — some recent ones came in cool — but the long-term line has clearly risen.
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.
Selfoss's temperature, year by year
Average temperature for each year from 1971 to 2025.
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 39 fewer freezing nights a year 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.
December has warmed the most — about 1.5°F. The warming runs across the whole year, not just one season.
Methodology & sources
Temperature — 1991–2020 normals computed from 11 years of daily observations at Keflavik, a weather station, about 78 km from the city centre. The underlying daily records come from NOAA's global station network.