Spearfish

Get the latest weather information for the city of Spearfish. Below are current weather reports, forecasts, and helpful charts to help you plan your day.

The climate in Spearfish, USA, is characterized as continental and relatively arid, with four distinct seasons. This means travelers can expect significant temperature fluctuations throughout the year, from freezing winters to warm summers. Overall, there is very low precipitation distributed across the year without a pronounced rainy season, highlighting the region's dryness.

Winters in Spearfish (December to February) are quite cold, with average temperatures often dropping below freezing, and minimums reaching -7.3°C (in January) and even -10.2°C (in February). Spring (March–May) brings gradual warming; despite the general dryness, May stands out as the month with the most precipitation (about 4 mm) and the highest number of wet days. Summer (June–August) is warm and sunny, with peak temperatures in July when the thermometer can rise to 29°C. Autumn (September–November) is marked by a steady decrease in temperature, preparing the city for winter. Minimal precipitation throughout most of the year makes the weather in Spearfish generally predictably dry.

The climate in Spearfish is characterized by significant seasonal temperature variations. The annual temperature range spans from freezing winter months to warm summers. The hottest month is typically July, with an average temperature of around 22.3°C and highs reaching 29.0°C. August is slightly cooler, with an average temperature of 21.1°C. The coldest month is usually February, when the average temperature drops to -4.9°C and nightly minimums can hit -10.2°C. January is also cold, with an average temperature of -2.6°C.

Summer months in Spearfish, from June to August, offer pleasant warmth transitioning into hot weather. Daytime temperatures in June average 25.2°C, in July they reach 29.0°C, and in August they are around 27.7°C. Nights bring a noticeable chill, with minimum temperatures in these months ranging from 12.3°C to 15.6°C. This significant difference between day and night temperatures makes evenings and early mornings refreshing, even during the peak of summer.

Winter in Spearfish, spanning December to February, is freezing. Average daytime highs in December and January stay around 2–3°C, while in February they barely rise above 0°C. At night, temperatures regularly drop well below freezing: to -5.8°C in December, -7.3°C in January, and -10.2°C in February. Shoulder seasons, spring and autumn, show a gradual change in temperatures with notable daily fluctuations, especially in April and October, when the difference between high and low temperatures can be quite substantial.

Spearfish sees low amounts of precipitation throughout the year, with a noticeable peak in late spring. The wettest month, both in terms of rainfall and the number of wet days, is May: during this period, an average of 4 mm of precipitation falls, and the number of wet days reaches 18. The driest months by total volume are the winter months—January, February, and March—as well as November and December, when only about 1 mm of precipitation falls.

The type of precipitation in Spearfish changes with the season. In winter, from December to February, when average temperatures drop well below freezing (from -4.9°C to -1.4°C), precipitation usually falls as snow. Despite the low total amount (1 mm), it is spread over 6–8 days per month. Precipitation gradually increases in spring: in March (average temperature 1.5°C) and April (5.3°C), both rain and snow are possible, especially early in these months. May becomes predominantly rainy. In summer, from June to August, with average temperatures between 18.8°C and 22.3°C, precipitation falls as rain, totaling 2–3 mm. In autumn, the volume decreases again: September and October are usually rainy, while in November, as temperatures drop to an average of 2.7°C, snow is likely again.

The frequency of precipitation in Spearfish is highest in May, with about 18 wet days. April, June, and July also see relatively frequent precipitation, with approximately 12–13 wet days each. The fewest rainy days occur in January (about 6 days). In other months, including most of autumn and winter, the number of wet days ranges from 7 to 10. This means that even during periods of minimal total precipitation, it is not uncommon, though its intensity—judging by the low volume—is usually light.

When planning a trip to Spearfish, it's important to consider the significant seasonal temperature changes and low precipitation. In winter (December–February) and the cooler shoulder months (November, March), average temperatures often drop below zero, sometimes reaching -7°C to -10°C. During this period, you will need very warm clothing: thermal underwear, fleece layers, a winter jacket (preferably windproof and waterproof), a hat, gloves, and a scarf. Although total precipitation is low (around 1 mm per month), the 6–9 "wet days" (including snow) mean that waterproof footwear and outerwear will come in handy. Layering will help you adapt to temperature changes throughout the day.

In spring (April–May) and autumn (September–October), the weather in Spearfish is changeable. It can still be chilly in April and October, so it's worth bringing a mid-season jacket, sweaters, and closed-toe shoes. May is characterized by an increase in precipitation (4 mm) and the highest number of rainy days (up to 18), so a waterproof jacket and an umbrella will be indispensable. Summer (June–August) is warm, with average highs ranging from +25°C to +29°C. Light clothing such as t-shirts, shorts, and dresses is suitable for this time of year. However, rain is still possible even in summer (2–3 mm, 10–13 rainy days), so a light windbreaker or raincoat may be useful, especially for evening walks. Don't forget sunscreen, a hat, and sunglasses. Regardless of the season, comfortable walking shoes are a must if you plan to explore the city and its surroundings.