Average annual surface temperature in Heard Island and McDonald Islands
Heard Island and McDonald Islands: Average annual surface temperature was 2.45 °C in 2025. ▲ Rising
Average annual surface temperature 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, average annual surface temperature in Heard Island and McDonald Islands stood at 2.45 °C. That is the highest value across all 86 years on record.
Compared with earlier readings it is up 23.2% on the previous year and up 67.9% over ten years.
Over the whole period, average annual surface temperature in Heard Island and McDonald Islands peaked at 2.45 °C in 2025 and was at its lowest, 0.6127 °C, in 1944.
Heard Island and McDonald Islands ranks 188th of 193 countries on this measure, in the bottom quarter.
The long-run direction has been consistently rising across the 86 years of available data.
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1940s | 0.9125 °C | 0.6127 °C | 1.28 °C | 10 |
| 1950s | 1.17 °C | 0.8517 °C | 1.53 °C | 10 |
| 1960s | 1.31 °C | 1.06 °C | 1.56 °C | 10 |
| 1970s | 1.32 °C | 0.974 °C | 1.85 °C | 10 |
| 1980s | 1.56 °C | 1.34 °C | 1.94 °C | 10 |
| 1990s | 1.49 °C | 1.14 °C | 1.83 °C | 10 |
| 2000s | 1.52 °C | 1.25 °C | 1.85 °C | 10 |
| 2010s | 1.8 °C | 1.12 °C | 2.26 °C | 10 |
| 2020s | 2.02 °C | 1.75 °C | 2.45 °C | 6 |
Countries ranked near Heard Island and McDonald Islands
- 185 Tajikistan 2.63 °C compare
- 186 Kyrgyzstan 2.5 °C compare
- 187 Norway 2.5 °C compare
- 189 Mongolia 2.24 °C compare
- 190 South Georgia and the South Sandwich Islands -0.0896 °C compare
- 191 Russia -2.35 °C compare
More reference data data for Heard Island and McDonald Islands
- Summer temperature anomalies 1.56 °C (2026)
- 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)
- Annual temperature anomalies 0.8308 °C (2025)
- Red List Index 0.93 index (2024)
- Member countries of the International Treaty on Plant Genetic Resources for Food and Agriculture 0 number (2024)
Frequently asked questions
- What is average annual surface temperature in Heard Island and McDonald Islands?
- Average annual surface temperature in Heard Island and McDonald Islands was 2.45 °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 average annual surface temperature recorded in Heard Island and McDonald Islands?
- The highest recorded value was 2.45 °C in 2025.
- What is the lowest average annual surface temperature recorded in Heard Island and McDonald Islands?
- The lowest recorded value was 0.6127 °C in 1944.
- How does Heard Island and McDonald Islands rank for average annual surface temperature?
- Heard Island and McDonald Islands ranks 188th out of 193 countries with data for 2025.
- Is average annual surface temperature rising or falling in Heard Island and McDonald Islands?
- Over the last ten years it is up 67.9%. The long-run trend across the full record is rising.
- 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 Average annual surface temperature. 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
The temperature of the air measured 2 meters above the ground, encompassing land, sea, and in-land water surfaces.