Sometimes it hails during a summer thunderstorm.

有时，夏天雷雨期间天会下雹。

One hot summer afternoon, he was taking a walk when a thunderstorm started all at once.

一个炎热的夏日下午，他正在散步，突然下起了雷雨。

An English summer, three hot days and a thunderstorm.

英国夏季三天炎热，一天雷雨。

There is a significant positive correlation between the weakening of East Asian summer monsoon and the reduction of annual average thunderstorm days.

东亚夏季风减弱与我国年雷暴日数减少呈极显著正相关。

While that incident was an extreme case, it was by no means the first time I'd seen poorly prepared summer hikers blown like chaff before the wrath of a Rocky Mountain thunderstorm.

虽然这起事件是一个极端的例子，它决不是我第一次见到准备不足的夏日远。