Summer temperature anomalies in Heard Island and McDonald Islands
Heard Island and McDonald Islands: Summer temperature anomalies was 1.56 °C in 2026. ◆ Volatile
Summer temperature anomalies in Heard Island and McDonald Islands, 1940–2026
Source: Contains modified Copernicus Climate Change Service information (2026) – with major processing by Our World in Data. Measured in °C.
Analysis
In 2026, summer temperature anomalies in Heard Island and McDonald Islands stood at 1.56 °C. That is the highest value across all 87 years on record.
That represents a change of up 174.8% on the previous year and up 131.8% over ten years.
Over the whole period, summer temperature anomalies in Heard Island and McDonald Islands peaked at 1.56 °C in 2026 and was at its lowest, -1.37 °C, in 1975.
Heard Island and McDonald Islands ranks 40th of 193 countries on this measure, in the top quarter.
The series is highly variable year to year, so single readings are best treated with caution.
Summer temperature anomalies in Heard Island and McDonald Islands, year by year
| Year | °C | Change |
|---|---|---|
| 1940 | 0.4259 °C | — |
| 1941 | -0.9245 °C | -317.1% |
| 1942 | 0.0822 °C | -108.9% |
| 1943 | -0.8469 °C | -1130.0% |
| 1944 | -1.35 °C | +59.1% |
| 1945 | -0.1287 °C | -90.5% |
| 1946 | 0.1857 °C | -244.3% |
| 1947 | 0.1543 °C | -16.9% |
| 1948 | -0.3988 °C | -358.5% |
| 1949 | -1.25 °C | +213.3% |
| 1950 | -1.28 °C | +2.2% |
| 1951 | 0.5322 °C | -141.7% |
| 1952 | -0.2664 °C | -150.1% |
| 1953 | -1.09 °C | +309.1% |
| 1954 | -0.616 °C | -43.5% |
| 1955 | -0.9574 °C | +55.4% |
| 1956 | -0.3862 °C | -59.7% |
| 1957 | -0.7953 °C | +106.0% |
| 1958 | -0.0158 °C | -98.0% |
| 1959 | -0.4337 °C | +2640.2% |
| 1960 | -0.4995 °C | +15.2% |
| 1961 | -0.3294 °C | -34.0% |
| 1962 | -0.8416 °C | +155.5% |
| 1963 | -0.7024 °C | -16.5% |
| 1964 | -0.6206 °C | -11.7% |
| 1965 | -0.3494 °C | -43.7% |
| 1966 | -0.6242 °C | +78.7% |
| 1967 | -0.687 °C | +10.1% |
| 1968 | -0.0512 °C | -92.5% |
| 1969 | -0.5589 °C | +991.7% |
| 1970 | 0.1959 °C | -135.1% |
| 1971 | -0.3588 °C | -283.2% |
| 1972 | -0.5775 °C | +61.0% |
| 1973 | -0.2644 °C | -54.2% |
| 1974 | -0.3576 °C | +35.3% |
| 1975 | -1.37 °C | +283.3% |
| 1976 | -1.24 °C | -9.2% |
| 1977 | -0.166 °C | -86.7% |
| 1978 | -0.527 °C | +217.5% |
| 1979 | -0.2147 °C | -59.3% |
| 1980 | 0.8376 °C | -490.0% |
| 1981 | 0.7584 °C | -9.5% |
| 1982 | 0.3702 °C | -51.2% |
| 1983 | -0.0958 °C | -125.9% |
| 1984 | -0.6673 °C | +596.9% |
| 1985 | -0.5705 °C | -14.5% |
| 1986 | 0.0517 °C | -109.1% |
| 1987 | -0.2767 °C | -634.9% |
| 1988 | -0.6044 °C | +118.4% |
| 1989 | -0.1539 °C | -74.5% |
| 1990 | -0.2128 °C | +38.3% |
| 1991 | 0.2236 °C | -205.1% |
| 1992 | 0.0985 °C | -56.0% |
| 1993 | 0.3899 °C | +296.0% |
| 1994 | -0.4136 °C | -206.1% |
| 1995 | 0.1551 °C | -137.5% |
| 1996 | -0.0558 °C | -136.0% |
| 1997 | 0.0478 °C | -185.8% |
| 1998 | 0.1985 °C | +314.9% |
| 1999 | -0.7248 °C | -465.2% |
| 2000 | -0.2058 °C | -71.6% |
| 2001 | -0.7643 °C | +271.3% |
| 2002 | 0.1312 °C | -117.2% |
| 2003 | 0.5923 °C | +351.4% |
| 2004 | 0.0178 °C | -97.0% |
| 2005 | -0.1417 °C | -896.1% |
| 2006 | -0.0615 °C | -56.6% |
| 2007 | -1.26 °C | +1950.3% |
| 2008 | -0.6096 °C | -51.7% |
| 2009 | -0.0322 °C | -94.7% |
| 2010 | 0.0538 °C | -267.0% |
| 2011 | -0.1939 °C | -460.3% |
| 2012 | 0.5459 °C | -381.5% |
| 2013 | -0.2931 °C | -153.7% |
| 2014 | 0.1646 °C | -156.2% |
| 2015 | -0.5868 °C | -456.4% |
| 2016 | 0.6724 °C | -214.6% |
| 2017 | 0.6937 °C | +3.2% |
| 2018 | 0.3251 °C | -53.1% |
| 2019 | 1.09 °C | +236.3% |
| 2020 | -0.0583 °C | -105.3% |
| 2021 | 0.5034 °C | -963.8% |
| 2022 | -0.035 °C | -106.9% |
| 2023 | 1.07 °C | -3172.9% |
| 2024 | 0.3596 °C | -66.5% |
| 2025 | 0.5671 °C | +57.7% |
| 2026 | 1.56 °C | +174.8% |
Biggest year-on-year movements
Years where Summer temperature anomalies in Heard Island and McDonald Islands changed far more than this series normally does. A large move can be a real event or a change in how the figure was measured — the source note below says who published it.
| Year | Change | From | To |
|---|---|---|---|
| 2023 | +3172.9% | -0.035 °C | 1.07 °C |
| 1959 | -2640.2% | -0.0158 °C | -0.4337 °C |
| 2007 | -1950.3% | -0.0615 °C | -1.26 °C |
| 1943 | -1130.0% | 0.0822 °C | -0.8469 °C |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1940s | -0.4048 °C | -1.35 °C | 0.4259 °C | 10 |
| 1950s | -0.5305 °C | -1.28 °C | 0.5322 °C | 10 |
| 1960s | -0.5264 °C | -0.8416 °C | -0.0512 °C | 10 |
| 1970s | -0.4885 °C | -1.37 °C | 0.1959 °C | 10 |
| 1980s | -0.0351 °C | -0.6673 °C | 0.8376 °C | 10 |
| 1990s | -0.0294 °C | -0.7248 °C | 0.3899 °C | 10 |
| 2000s | -0.2336 °C | -1.26 °C | 0.5923 °C | 10 |
| 2010s | 0.2475 °C | -0.5868 °C | 1.09 °C | 10 |
| 2020s | 0.5671 °C | -0.0583 °C | 1.56 °C | 7 |
Countries ranked near Heard Island and McDonald Islands
More climate change data for Heard Island and McDonald Islands
- Spring temperature anomalies 0.8521 °C (2026)
- Temperature anomalies by month 0.876 °C (2026)
- Annual precipitation 1,377 millimeters (2025)
- Precipitation anomalies 29.5 millimeters (2025)
- Autumn temperature anomalies 0.9668 °C (2025)
- Winter temperature anomalies 0.8706 °C (2025)
- Precipitation anomalies, annual growth rate 363.4 % change on previous year (2025)
- Annual PM2.5 emissions from wildfires 0 tonnes (2026)
- Temperature anomalies vs. latitude 0.8308 °C (2025)
- Annual CO₂ emissions from wildfires 0 tonnes (2026)
Frequently asked questions
- What is summer temperature anomalies in Heard Island and McDonald Islands?
- Summer temperature anomalies in Heard Island and McDonald Islands was 1.56 °C in 2026, according to Contains modified Copernicus Climate Change Service information (2026) – with major processing by Our World in Data.
- What is the highest summer temperature anomalies recorded in Heard Island and McDonald Islands?
- The highest recorded value was 1.56 °C in 2026.
- What is the lowest summer temperature anomalies recorded in Heard Island and McDonald Islands?
- The lowest recorded value was -1.37 °C in 1975.
- How does Heard Island and McDonald Islands rank for summer temperature anomalies?
- Heard Island and McDonald Islands ranks 40th out of 193 countries with data for 2026.
- Is summer temperature anomalies rising or falling in Heard Island and McDonald Islands?
- Over the last ten years it is up 131.8%. The long-run trend across the full record is volatile.
- Where does this Heard Island and McDonald Islands data come from?
- The figures come from Contains modified Copernicus Climate Change Service information (2026) – with major processing by Our World in Data, published as part of Summer temperature anomalies. Statizoid updates them automatically from the source API.
Download this data
CSV · JSON — 87 observations, free to reuse under CC BY 4.0 (Our World in Data).
About this data
Difference in a specific month's average surface temperature from the mean temperature of the same month during the period 1991-2020, measured in degrees Celsius.