Guangdong, China · population 125,427 · 11 weather stations within 200 km · records 1785 to 2025
Haimen has an average annual daytime high of 24.7°C, based on the 1951 to 1980 baseline. Its warmest month is July, when highs typically reach 30.9°C, and its coldest is January, with overnight lows near 11.3°C.
These figures reflect annual averages, not single-day records. Daily observations are outside this dataset's precision.
Since 1900, Haimen's average temperature has risen by +2.3°C. Compared to the earliest station records that begin in 1785, warming totals +1.9°C.
20-year smoothed annual temperature reconstructed from station anomalies. Dashed line: 1951–1980 baseline.
Daytime highs sit within a comfortable 15°C to 26°C range.
Haimen's average annual daytime high is 24.7°C, based on the 1951 to 1980 baseline period. The warmest month is July, with highs averaging 30.9°C, and the coldest is January, with lows averaging 11.3°C.
July is the warmest month in Haimen, with typical daytime highs of 30.9°C.
2020 is the hottest year on record for Haimen, running +1.8°C above the 1951 to 1980 baseline.
Yes. Since 1900, Haimen has warmed by roughly +2.3°C.
January to December typically offers the most comfortable daytime highs, in the 15°C to 26°C range.
Baseline period 1951 to 1980. Monthly averages are the mean of station observations weighted by proximity. Warming trend is the 20-year smoothed anomaly against that baseline.