Annual temperature anomalies in Heard Island and McDonald Islands
Heard Island and McDonald Islands: Annual temperature anomalies was 0.8308 °C in 2025. ◆ Volatile
Annual temperature anomalies in Heard Island and McDonald Islands, 1940–2025
Source: Contains modified Copernicus Climate Change Service information (2026) – with major processing by Our World in Data. Measured in °C.
Analysis
In 2025, annual temperature anomalies in Heard Island and McDonald Islands stood at 0.8308 °C. That is the highest value across all 86 years on record.
Compared with earlier readings it is up 124.9% on the previous year and up 623.1% over ten years.
Over the whole period, annual temperature anomalies in Heard Island and McDonald Islands peaked at 0.8308 °C in 2025 and was at its lowest, -1 °C, in 1944.
That places Heard Island and McDonald Islands 68th out of 193 countries with data for 2025, putting it in the middle of the range.
The series is highly variable year to year, so single readings are best treated with caution.
Annual temperature anomalies in Heard Island and McDonald Islands, year by year
| Year | °C | Change |
|---|---|---|
| 1940 | -0.7879 °C | — |
| 1941 | -0.9899 °C | +25.6% |
| 1942 | -0.5548 °C | -44.0% |
| 1943 | -0.7223 °C | +30.2% |
| 1944 | -1 °C | +38.9% |
| 1945 | -0.6743 °C | -32.8% |
| 1946 | -0.4678 °C | -30.6% |
| 1947 | -0.3369 °C | -28.0% |
| 1948 | -0.6499 °C | +92.9% |
| 1949 | -0.8501 °C | +30.8% |
| 1950 | -0.7646 °C | -10.1% |
| 1951 | -0.0904 °C | -88.2% |
| 1952 | -0.2639 °C | +191.9% |
| 1953 | -0.4991 °C | +89.2% |
| 1954 | -0.5076 °C | +1.7% |
| 1955 | -0.6102 °C | +20.2% |
| 1956 | -0.5467 °C | -10.4% |
| 1957 | -0.6338 °C | +15.9% |
| 1958 | -0.1344 °C | -78.8% |
| 1959 | -0.4241 °C | +215.5% |
| 1960 | -0.0925 °C | -78.2% |
| 1961 | -0.2488 °C | +169.0% |
| 1962 | -0.3965 °C | +59.4% |
| 1963 | -0.5538 °C | +39.7% |
| 1964 | -0.5443 °C | -1.7% |
| 1965 | -0.4137 °C | -24.0% |
| 1966 | -0.2661 °C | -35.7% |
| 1967 | -0.3729 °C | +40.1% |
| 1968 | -0.0897 °C | -75.9% |
| 1969 | -0.0564 °C | -37.1% |
| 1970 | -0.1403 °C | +148.7% |
| 1971 | -0.3107 °C | +121.5% |
| 1972 | -0.4247 °C | +36.7% |
| 1973 | -0.379 °C | -10.7% |
| 1974 | -0.6423 °C | +69.4% |
| 1975 | -0.4848 °C | -24.5% |
| 1976 | -0.5418 °C | +11.7% |
| 1977 | -0.1818 °C | -66.4% |
| 1978 | -0.0481 °C | -73.6% |
| 1979 | 0.2368 °C | -592.8% |
| 1980 | 0.026 °C | -89.0% |
| 1981 | 0.1067 °C | +310.0% |
| 1982 | 0.3266 °C | +206.1% |
| 1983 | 0.0262 °C | -92.0% |
| 1984 | -0.2779 °C | -1159.7% |
| 1985 | -0.2512 °C | -9.6% |
| 1986 | -0.1664 °C | -33.8% |
| 1987 | 0.0838 °C | -150.4% |
| 1988 | -0.2328 °C | -377.8% |
| 1989 | -0.2522 °C | +8.3% |
| 1990 | -0.1644 °C | -34.8% |
| 1991 | -0.0294 °C | -82.1% |
| 1992 | -0.0055 °C | -81.1% |
| 1993 | -0.134 °C | +2318.7% |
| 1994 | -0.3351 °C | +150.0% |
| 1995 | -0.2162 °C | -35.5% |
| 1996 | -0.4759 °C | +120.2% |
| 1997 | 0.2089 °C | -143.9% |
| 1998 | 0.2057 °C | -1.6% |
| 1999 | -0.2837 °C | -237.9% |
| 2000 | -0.2804 °C | -1.2% |
| 2001 | -0.0008 °C | -99.7% |
| 2002 | -0.0371 °C | +4317.9% |
| 2003 | 0.2306 °C | -721.3% |
| 2004 | 0.0561 °C | -75.7% |
| 2005 | -0.2674 °C | -577.1% |
| 2006 | -0.2346 °C | -12.3% |
| 2007 | -0.3674 °C | +56.6% |
| 2008 | 0.0426 °C | -111.6% |
| 2009 | -0.1318 °C | -409.6% |
| 2010 | 0.1698 °C | -228.8% |
| 2011 | 0.0221 °C | -87.0% |
| 2012 | 0.3927 °C | +1679.3% |
| 2013 | 0.0887 °C | -77.4% |
| 2014 | -0.4988 °C | -662.4% |
| 2015 | -0.1588 °C | -68.2% |
| 2016 | 0.3718 °C | -334.1% |
| 2017 | 0.6433 °C | +73.1% |
| 2018 | 0.4253 °C | -33.9% |
| 2019 | 0.3395 °C | -20.2% |
| 2020 | 0.26 °C | -23.4% |
| 2021 | 0.1978 °C | -23.9% |
| 2022 | 0.1353 °C | -31.6% |
| 2023 | 0.6211 °C | +359.1% |
| 2024 | 0.3693 °C | -40.5% |
| 2025 | 0.8308 °C | +124.9% |
Biggest year-on-year movements
Years where Annual 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 |
|---|---|---|---|
| 2002 | -4317.9% | -0.0008 °C | -0.0371 °C |
| 1993 | -2318.7% | -0.0055 °C | -0.134 °C |
| 2012 | +1679.3% | 0.0221 °C | 0.3927 °C |
| 1984 | -1159.7% | 0.0262 °C | -0.2779 °C |
| 2003 | +721.3% | -0.0371 °C | 0.2306 °C |
| 2014 | -662.4% | 0.0887 °C | -0.4988 °C |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1940s | -0.7038 °C | -1 °C | -0.3369 °C | 10 |
| 1950s | -0.4475 °C | -0.7646 °C | -0.0904 °C | 10 |
| 1960s | -0.3035 °C | -0.5538 °C | -0.0564 °C | 10 |
| 1970s | -0.2917 °C | -0.6423 °C | 0.2368 °C | 10 |
| 1980s | -0.0611 °C | -0.2779 °C | 0.3266 °C | 10 |
| 1990s | -0.123 °C | -0.4759 °C | 0.2089 °C | 10 |
| 2000s | -0.099 °C | -0.3674 °C | 0.2306 °C | 10 |
| 2010s | 0.1796 °C | -0.4988 °C | 0.6433 °C | 10 |
| 2020s | 0.4024 °C | 0.1353 °C | 0.8308 °C | 6 |
Countries ranked near Heard Island and McDonald Islands
- 65 Morocco 0.8537 °C compare
- 66 Central African Republic 0.8424 °C compare
- 67 United States 0.8334 °C compare
- 69 Portugal 0.8306 °C compare
- 70 Honduras 0.8284 °C compare
- 71 New Zealand 0.826 °C compare
More reference data data for Heard Island and McDonald Islands
- Annual precipitation, annual growth rate 3.05 % change on previous year (2025)
- Exposure to extreme precipitation — Annual precipitation change -17.8 Millimetres per year (2023)
- Exposure to extreme temperature — Annual temperature change 0.729 Degrees celsius (2023)
- Red List Index 0.93 index (2025)
- Average annual surface temperature 2.45 °C (2025)
- Member countries of the International Treaty on Plant Genetic Resources for Food and Agriculture 0 number (2025)
- Annual area burnt by wildfires 0 hectares (2026)
- Annual number of wildfires 0 wildfires (2026)
- Annual area burnt per wildfire vs. number of fires 0 wildfires (2026)
- Chlorophyll-a deviation from the global average 3.3% (2022)
Frequently asked questions
- What is annual temperature anomalies in Heard Island and McDonald Islands?
- Annual temperature anomalies in Heard Island and McDonald Islands was 0.8308 °C in 2025, according to Contains modified Copernicus Climate Change Service information (2026) – with major processing by Our World in Data.
- What is the highest annual temperature anomalies recorded in Heard Island and McDonald Islands?
- The highest recorded value was 0.8308 °C in 2025.
- What is the lowest annual temperature anomalies recorded in Heard Island and McDonald Islands?
- The lowest recorded value was -1 °C in 1944.
- How does Heard Island and McDonald Islands rank for annual temperature anomalies?
- Heard Island and McDonald Islands ranks 68th out of 193 countries with data for 2025.
- Is annual temperature anomalies rising or falling in Heard Island and McDonald Islands?
- Over the last ten years it is up 623.1%. 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 Annual temperature anomalies. Statizoid updates them automatically from the source API.
Download this data
CSV · JSON — 86 observations, free to reuse under CC BY 4.0 (Our World in Data).
About this data
Difference of a specific year's average surface temperature from the 1991-2020 mean, in degrees Celsius.