The average number of high-temperature days nationwide exceeded the usual count by 4.4 days, and was the second highest since 1961.
The vice-minister said China has always proactively supported other developing nations to enhance their climate adaptation capabilities.
The BRI has great potential to champion environmental protection and climate action, alongside economic, social and cultural development.
Senior officials and observers from around the world have been impressed by China's enterprising diplomatic efforts in recent months in engaging wealthy nations as well as the most vulnerable countries in tackling the increasingly challenging global problem of climate change.
After three days of discussions last week in India on issues such as cutting emissions and fossil fuel use, as well as climate financing to support poorer nations, the group of major nations failed to issue a joint communique or deliver any new pledges.