Spearfish (SD) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Spearfish

Spearfish average temperature chart (Celsius) Spearfish average temperature chart (Fahrenheit)
Average monthly temperatures in Spearfish (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -0.8 1.7 5.9 12.6 18.5 24.1 28.8 27.6 21.2 14.8 5.8 0.2
°F 30.6 35 42.6 54.6 65.2 75.5 83.8 81.6 70.1 58.6 42.4 32.4

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Spearfish monthly rainfall chart (mm) Spearfish monthly rainfall chart (inches)
Average monthly rainfall in Spearfish (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 11 14 22 44 72 77 52 42 32 25 16 14
inches 0.4 0.6 0.9 1.7 2.8 3 2 1.7 1.3 1 0.6 0.6
Rainy days 8 8 10 10 12 12 10 8 8 6 7 8

Average annual rainfall in Spearfish: 362.6mm (142.8 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Spearfish

Spearfish average daily sunshine chart
Average daily sunshine Spearfish
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.9 6.9 8.1 8.8 9.4 11 11.6 10.9 9.2 7.7 5.7 5.5

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Spearfish average minimum / maximum temperatures (Celsius) Spearfish average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Spearfish (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -12.5 -10.4 -6.6 -1.1 4.6 9.7 13.5 12.1 6.3 0.7 -6.1 -11.3
Max °C -0.5 2 6.2 12.9 18.8 24.5 29.2 28 21.6 15.1 6.1 0.5
Min °F 9.5 13.4 20.1 30 40.3 49.5 56.2 53.7 43.3 33.3 21.1 11.7
Max °F 20.3 24.4 31.6 42.6 53.1 62.8 70.3 68 57 46.2 32 22.3

Sea temperature

The graph below shows the average sea temperature.

Spearfish average sea temperature chart (Celsius) Spearfish average sea temperature chart (Fahrenheit)
Average sea temperature around Spearfish in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8 7.9 8.1 8.9 10.1 12 14.3 16.6 15.7 13 10.5 8.8
°F 46.5 46.1 46.7 48 50.2 53.6 57.8 61.8 60.3 55.4 50.9 47.8

Wind speed

The graph below shows the average wind speed.

Spearfish average winspeed by month (km/h) Spearfish average winspeed by month (mph)
Average wind speed in Spearfish (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 20 19 21 22 20 18 17 17 18 18 18 19
mph 12 12 13 14 13 11 10 11 11 11 11 12

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Spearfish relative humidity averages
Average relative humidity in Spearfish
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
65% 66% 64% 58% 60% 61% 55% 52% 55% 56% 64% 66%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Spearfish weather stats

Spearfish weather statistics
Hottest month: July 28.8°C 83.8°F
Driest month: January 11mm 0.4ins
Sunniest month: August 10.9hrs
Coldest month: January -0.8°C 30.6°F
Wettest month: June 77mm 3ins
Warmest sea: August 16.6°C 61.9°F
Map showing location of Spearfish (44.49082, -103.85937) Spearfish map pin © Google

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