Deadwood has a different climate than the rest of South Dakota and surrounding areas.
Summer (June - August): Average temperature during the day is generally around 25 °C and around 10 °C at night.
Winter (November - March): The temperature average at around 5 °C during the day and -10 °C at night. However, temperatures have been known to reach as low as -34 °C.
Autumn (September - October): Temperature averages at around 7 °C during the day and round 3 °C at night.
Spring (April - May): Average high temperature is usually around 10 °C and 1 °C at night. Spring is also accompanied by rain and snow storms.
The best time to visit Deadwood during the short summer season when the weather is cool and pleasant. The city receives about 30 inches of snow every year, however it can begin snowing as early as September and go on till May.