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阴影下
炎热指数
--℃
气温 --℃
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阳光下
炎热指数
--℃
等效气温 --℃
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舒适注意警惕危险极度
逐时趋势
未来逐时炎热指数与阴影下气温，滑动查看
关于数据与算法
阴影下气温：气象站实测空气温度（℃），即日常天气预报温度。
阳光下气温：按直接太阳辐射折算的等效气温，仅用于估算阳光下炎热指数，非实测温度。阴影与全阳的差值随指标而异（WBGT 全阳较阴影高约 2–3℃，晴天正午黑球温度较气温高 10–15℃），本页按辐射线性折算、上限 9℃，属保守启发式估计。
炎热指数 (HI)：美国 NWS/Rothfusz 体感温度公式，综合气温与相对湿度。公式仅对气温 ≥26.7℃（80°F）有效（Anderson et al., 2013），本页按 NWS 官方算法加入低湿度与温和区间修正。
- <26.7℃：舒适 / 凉爽
- 26.7–32.2℃：注意 · 长时间活动可能疲劳
- 32.2–39.4℃：警惕 · 热痉挛、热衰竭风险升高
- 39.4–51.7℃：危险 · 热相关疾病风险高
- ≥51.7℃：极度危险 · 中暑风险极高，避免户外活动
数据来源：Open-Meteo（免费）。炎热指数按 NWS 定义针对"阴凉、轻风"环境，风速不参与计算；如需更严谨地纳入太阳辐射与风速，可参考 WBGT（ISO 7243）或 UTCI。当气温低于 26.7℃ 时不计算炎热指数，直接显示气温。
参考文献 12 条
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