Annual temperature anomalies in Heard Island and McDonald Islands
Heard Island and McDonald Islands: Annual temperature anomalies was 0.8308 in 2025. ◆ Volatile
Annual temperature anomalies in Heard Island and McDonald Islands, 1940–2025
Source: Our World in Data.
Analysis
In 2025, annual temperature anomalies in Heard Island and McDonald Islands stood at 0.8308. 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 in 2025 and was at its lowest, -1, 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.
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1940s | -0.7038 | -1 | -0.3369 | 10 |
| 1950s | -0.4475 | -0.7646 | -0.0904 | 10 |
| 1960s | -0.3035 | -0.5538 | -0.0564 | 10 |
| 1970s | -0.2917 | -0.6423 | 0.2368 | 10 |
| 1980s | -0.0611 | -0.2779 | 0.3266 | 10 |
| 1990s | -0.123 | -0.4759 | 0.2089 | 10 |
| 2000s | -0.099 | -0.3674 | 0.2306 | 10 |
| 2010s | 0.1796 | -0.4988 | 0.6433 | 10 |
| 2020s | 0.4024 | 0.1353 | 0.8308 | 6 |
Countries ranked near Heard Island and McDonald Islands
- 65 Morocco 0.8537 compare
- 67 United States 0.8334 compare
- 69 Portugal 0.8306 compare
- 70 Honduras 0.8284 compare
- 71 New Zealand 0.826 compare
More reference data data for Heard Island and McDonald Islands
- Summer temperature anomalies 1.56 (2026)
- Spring temperature anomalies 0.8521 (2026)
- Country level monthly temperature anomalies 0.876 (2026)
- Average precipitation per year 1,377 (2025)
- Global precipitation anomaly 29.5 (2025)
- Autumn temperature anomalies 0.9668 (2025)
- Winter temperature anomalies 0.8706 (2025)
- Average annual surface temperature 2.45 (2025)
- Red list index 0.93 (2024)
- Countries to the international treaty on plant genetic resources 0 (2024)
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 in 2025, according to 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 in 2025.
- What is the lowest annual temperature anomalies recorded in Heard Island and McDonald Islands?
- The lowest recorded value was -1 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 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).