Daily minimum and maximum temperature show many website like Skymetweather, AccuWeather
No there is no fix time for recording Min or Max temperature. Its a constant process and for a day whenever a temperature goes down from the previous min then min is modified and whenever a temperature goes above from the previous max then max is modified an reported.
Which is the best weather for a night campfire? Is it wind speed like 13mph, or farenheit temp like 55-57 degrees or chance of rain like 0-10% chance , or partly cloudy or clear sky ,or is it low humidity?