Most professionals will not want to set off their fireworks once winds get 20 to 30 miles an hour or higher. While rain itself doesn't have a direct impact on the brilliance of fireworks, high humidity can.
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Pyrotechnicians (fireworks experts) cover the fireworks setup with thin plastic sheets if there's a threat of rain. That's keeps them dry and when fired, they go right through the plastic and everything happens fast enough to not affect the 'explosions'.
Hiking & WindIn strong winds, your balance may become compromised, increasing the risk of slips and falls. At 30mph winds can start to affect your balance, in 40mph winds walking becomes difficult. If the wind speeds are up to 50mph, it's dangerous to continue for even experienced hikers.