Fact · climate · 2025
Hot nights
熱夜數目
Figure and reference date
54 nights (2025; third most on record)
54 天（2025，有紀錄以來第三多）
Notes and definition
HKO: nights with min ≥28°C.
Other figures in this group (climate)
Figures in the same group are not necessarily additive — check the basis note above first. Climate.
| Item / 項目 | Figure / 數字 | As of / 時點 | Source / 來源 |
|---|---|---|---|
| Mean annual rainfall 平均全年雨量 | 2,431.2 mm 2 431.2 毫米 GovHK uses this long-term mean. Hong Kong in Figures 2026 also lists 1991–2020 normals; recorded rainfall in 2025 was 2,558.7 mm. | 1991-2020 | Hong Kong Fact Sheet |
| Annual mean air temperature (normal) 全年平均氣溫（正常值） | 23.5°C 23.5°C | 1991-2020 | Hong Kong in Figures, 2026 Edition |
| Record maximum temperature at the Observatory 天文台最高氣溫紀錄 | 39.0°C on 22 July 2022 39.0°C（2022 年 7 月 22 日） The highest temperature since the Observatory began records in 1884. Extreme-heat days are updated annually by the HKO. | 2022-07-22 | Hong Kong Fact Sheet |
| Record minimum temperature at the Observatory 天文台最低氣溫紀錄 | 0.0°C on 18 January 1957 0.0°C（1957 年 1 月 18 日） The lowest temperature at the urban Observatory; uplands and the countryside can be colder, per separate station records. | 1957-01-18 | Hong Kong Fact Sheet |
| Very Hot Weather days 酷熱天氣日數 | 53 days (2025; third most on record) 53 天（2025，有紀錄以來第三多） HKO Year 2025: days with max ≥33°C. | 2025 | Hong Kong Observatory: The Year 2025 |
| Thunderstorm days in a year 全年雷暴日數 | 37 days (2025) 37 天（2025） HKO does not publish a year total for lightning; thunderstorm days used as proxy. | 2025 | Hong Kong Observatory: The Year 2025 |
Other figures from the same official source
These figures come from the same registered document: “Hong Kong Observatory: The Year 2025” (Hong Kong Observatory). Being in one document does not make them additive.
| Item / 項目 | Figure / 數字 | As of / 時點 | Source / 來源 |
|---|---|---|---|
| Very Hot Weather days 酷熱天氣日數 | 53 days (2025; third most on record) 53 天（2025，有紀錄以來第三多） HKO Year 2025: days with max ≥33°C. | 2025 | Hong Kong Observatory: The Year 2025 |
| Thunderstorm days in a year 全年雷暴日數 | 37 days (2025) 37 天（2025） HKO does not publish a year total for lightning; thunderstorm days used as proxy. | 2025 | Hong Kong Observatory: The Year 2025 |
How to cite this figure
Hong Kong Story, “Hot nights”, https://hongkongstory.org/en/facts/climate-hot-nights-2025, data as at 2025 (retrieved ＿).
中文：香港紀事館，〈熱夜數目〉，https://hongkongstory.org/facts/climate-hot-nights-2025，資料時點 2025（查閱日期 ＿）。
Machine-readable: /api/v1/facts.json (id = climate-hot-nights-2025) · OpenAPI 3.1 ·/llms.txt
Registered source
Hong Kong Observatory: The Year 2025
Hong Kong Observatory
The official document carries no registered publication date, so only the retrieval date 2026-10-11 is given — no publication year is invented.
This site is a secondary compilation: the official text prevails. If the figure above differs from the official document, the official document is correct.