Spearfish (SD) Temperature by Month
The average annual maximum temperature in Spearfish, South Dakota, United States of America is 15°C (59°F), with daytime highs ranging from 3°C (37°F) in February to 30°C (86°F) in July. This page covers monthly averages, day-night differences, and how Spearfish compares to cities worldwide.
Spearfish Monthly Temperatures
The weather in Spearfish experiences significant differences between warm and cold seasons, with big shifts in temperature. At night, minimum temperatures range from 15°C (59°F) in July to -9°C (16°F) in February.
The chart below illustrates the average maximum day and minimum night temperatures in Spearfish by month:
Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating.
The chart below shows the average temperature throughout the year:
Temperature: Spearfish vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
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Spearfish vs World: Temperature Compared
Spearfish's average annual maximum temperature is 15°C (59°F). To put that in context, here's how it compares to a few well-known destinations:
Seville, Spain averages 23°C (73°F) a year — one of the warmer cities in Western Europe, with long hot summers.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
Chicago, USA averages 15°C (59°F) annually — known for extreme seasonal swings, from bitterly cold winters to warm summers.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Spearfish's weather — including monthly rainfall, sunshine hours, and humidity — visit our Spearfish climate page.
