Temperature anomalies by month in Heard Island and McDonald Islands
Heard Island and McDonald Islands: Temperature anomalies by month was 0.876 °C in 2026. ◆ Volatile
Temperature anomalies by month 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
Heard Island and McDonald Islands recorded 0.876 °C for temperature anomalies by month in 2026. That is the highest value across all 87 years on record.
Compared with earlier readings it is up 65.3% on the previous year and up 376.3% over ten years.
Over the whole period, temperature anomalies by month in Heard Island and McDonald Islands peaked at 0.876 °C in 2026 and was at its lowest, -0.8778 °C, in 1946.
Heard Island and McDonald Islands ranks 46th 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.
Temperature anomalies by month in Heard Island and McDonald Islands, year by year
| Year | °C | Change |
|---|---|---|
| 1940 | -0.5467 °C | — |
| 1941 | -0.2784 °C | -49.1% |
| 1942 | -0.0892 °C | -68.0% |
| 1943 | -0.0119 °C | -86.7% |
| 1944 | -0.494 °C | +4059.0% |
| 1945 | -0.3616 °C | -26.8% |
| 1946 | -0.8778 °C | +142.7% |
| 1947 | -0.2265 °C | -74.2% |
| 1948 | -0.4577 °C | +102.1% |
| 1949 | -0.4702 °C | +2.7% |
| 1950 | -0.7149 °C | +52.1% |
| 1951 | 0.5767 °C | -180.7% |
| 1952 | -0.3982 °C | -169.1% |
| 1953 | -0.045 °C | -88.7% |
| 1954 | -0.1728 °C | +284.3% |
| 1955 | -0.5459 °C | +216.0% |
| 1956 | -0.8232 °C | +50.8% |
| 1957 | -0.5706 °C | -30.7% |
| 1958 | -0.4079 °C | -28.5% |
| 1959 | 0.1242 °C | -130.4% |
| 1960 | -0.129 °C | -203.9% |
| 1961 | -0.5977 °C | +363.4% |
| 1962 | -0.162 °C | -72.9% |
| 1963 | -0.4451 °C | +174.7% |
| 1964 | -0.4276 °C | -3.9% |
| 1965 | -0.4542 °C | +6.2% |
| 1966 | -0.3059 °C | -32.6% |
| 1967 | -0.3987 °C | +30.3% |
| 1968 | -0.4723 °C | +18.5% |
| 1969 | -0.1086 °C | -77.0% |
| 1970 | 0.0124 °C | -111.4% |
| 1971 | -0.4059 °C | -3385.7% |
| 1972 | -0.7824 °C | +92.8% |
| 1973 | -0.3379 °C | -56.8% |
| 1974 | -0.811 °C | +140.0% |
| 1975 | -0.2969 °C | -63.4% |
| 1976 | -0.3402 °C | +14.6% |
| 1977 | -0.7215 °C | +112.1% |
| 1978 | -0.0006 °C | -99.9% |
| 1979 | 0.344 °C | -53187.4% |
| 1980 | 0.2023 °C | -41.2% |
| 1981 | -0.3067 °C | -251.6% |
| 1982 | 0.0102 °C | -103.3% |
| 1983 | 0.344 °C | +3287.0% |
| 1984 | -0.5631 °C | -263.7% |
| 1985 | -0.6025 °C | +7.0% |
| 1986 | -0.4667 °C | -22.5% |
| 1987 | -0.3495 °C | -25.1% |
| 1988 | -0.1502 °C | -57.0% |
| 1989 | -0.8271 °C | +450.6% |
| 1990 | -0.4746 °C | -42.6% |
| 1991 | 0.0286 °C | -106.0% |
| 1992 | 0.1088 °C | +280.5% |
| 1993 | -0.3844 °C | -453.3% |
| 1994 | 0.0974 °C | -125.3% |
| 1995 | -0.4504 °C | -562.3% |
| 1996 | -0.5617 °C | +24.7% |
| 1997 | 0.4592 °C | -181.7% |
| 1998 | 0.2496 °C | -45.6% |
| 1999 | -0.1259 °C | -150.4% |
| 2000 | -0.2324 °C | +84.6% |
| 2001 | -0.1296 °C | -44.3% |
| 2002 | 0.0145 °C | -111.2% |
| 2003 | 0.2027 °C | +1293.1% |
| 2004 | 0.379 °C | +87.0% |
| 2005 | -0.4511 °C | -219.0% |
| 2006 | -0.2811 °C | -37.7% |
| 2007 | -0.0896 °C | -68.1% |
| 2008 | -0.0439 °C | -51.0% |
| 2009 | -0.2199 °C | +400.6% |
| 2010 | 0.0858 °C | -139.0% |
| 2011 | -0.0166 °C | -119.3% |
| 2012 | 0.4709 °C | -2940.4% |
| 2013 | 0.4994 °C | +6.1% |
| 2014 | -0.6741 °C | -235.0% |
| 2015 | -0.4424 °C | -34.4% |
| 2016 | 0.1839 °C | -141.6% |
| 2017 | 0.2527 °C | +37.4% |
| 2018 | 0.4912 °C | +94.4% |
| 2019 | 0.267 °C | -45.6% |
| 2020 | 0.3123 °C | +17.0% |
| 2021 | -0.0047 °C | -101.5% |
| 2022 | -0.4388 °C | +9283.2% |
| 2023 | 0.3017 °C | -168.7% |
| 2024 | 0.0788 °C | -73.9% |
| 2025 | 0.5298 °C | +572.2% |
| 2026 | 0.876 °C | +65.3% |
Biggest year-on-year movements
Years where Temperature anomalies by month 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 |
|---|---|---|---|
| 1979 | +53187.4% | -0.0006 °C | 0.344 °C |
| 2022 | -9283.2% | -0.0047 °C | -0.4388 °C |
| 1944 | -4059.0% | -0.0119 °C | -0.494 °C |
| 1971 | -3385.7% | 0.0124 °C | -0.4059 °C |
| 1983 | +3287.0% | 0.0102 °C | 0.344 °C |
| 2012 | +2940.4% | -0.0166 °C | 0.4709 °C |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1940s | -0.3814 °C | -0.8778 °C | -0.0119 °C | 10 |
| 1950s | -0.2978 °C | -0.8232 °C | 0.5767 °C | 10 |
| 1960s | -0.3501 °C | -0.5977 °C | -0.1086 °C | 10 |
| 1970s | -0.334 °C | -0.811 °C | 0.344 °C | 10 |
| 1980s | -0.2709 °C | -0.8271 °C | 0.344 °C | 10 |
| 1990s | -0.1053 °C | -0.5617 °C | 0.4592 °C | 10 |
| 2000s | -0.0851 °C | -0.4511 °C | 0.379 °C | 10 |
| 2010s | 0.1118 °C | -0.6741 °C | 0.4994 °C | 10 |
| 2020s | 0.2364 °C | -0.4388 °C | 0.876 °C | 7 |
Countries ranked near Heard Island and McDonald Islands
More reference data data for Heard Island and McDonald Islands
- Spring temperature anomalies 0.8521 °C (2026)
- Autumn temperature anomalies 0.6023 °C (2026)
- Summer temperature anomalies 1.56 °C (2026)
- Annual precipitation 1,377 millimeters (2025)
- Annual precipitation, annual growth rate 3.05 % change on previous year (2025)
- Precipitation anomalies 29.5 millimeters (2025)
- Winter temperature anomalies 0.8706 °C (2025)
- Exposure to extreme temperature — Annual temperature change 0.729 Degrees celsius (2023)
- Exposure to extreme precipitation — Annual precipitation change -17.8 Millimetres per year (2023)
- Red List Index 0.93 index (2025)
Frequently asked questions
- What is temperature anomalies by month in Heard Island and McDonald Islands?
- Temperature anomalies by month in Heard Island and McDonald Islands was 0.876 °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 temperature anomalies by month recorded in Heard Island and McDonald Islands?
- The highest recorded value was 0.876 °C in 2026.
- What is the lowest temperature anomalies by month recorded in Heard Island and McDonald Islands?
- The lowest recorded value was -0.8778 °C in 1946.
- How does Heard Island and McDonald Islands rank for temperature anomalies by month?
- Heard Island and McDonald Islands ranks 46th out of 193 countries with data for 2026.
- Is temperature anomalies by month rising or falling in Heard Island and McDonald Islands?
- Over the last ten years it is up 376.3%. 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 Temperature anomalies by month. 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.