<%@LANGUAGE="JAVASCRIPT" CODEPAGE="1252"%> Weather History - Mount Rushmore National Memorial
Weather History 

When planning a trip, the weather is an important part of the process. Weather in the Black Hills is often pleasant for the season.A rainbow formed during an afternoon thunderstorm.

Spring/Autumn
May and June are the two wettest months of the year. In late May and early June fog can obscure the view of Mount Rushmore for part of the day. Autumn and spring can be very short seasons between winter and summer.

Summer
During the summer months afternoon thunderstorms are common but brief. The storms are caused by Orographic Lift. Orographic lift occurs when elevated terrain, such as mountains, act as barriers to the flow of air. As air ascends a mountain slope it cools, cooling often generates clouds and precipitation. At the same time warm air from the plains is rising. When these two bodies of air meet, the atmosphere become unstable and thunderstorms are generated. The average summer day is warm and sunny with a chance of afternoon thunderstorms.

Winter
Winters are not as hard as many people expect. During the winter snow storms will occur but the snow usually melts within a couple of days. The Black Hills are often warmer than Rapid City and the surrounding plains in the winter because of temperature inversions. Cold air coming into the area is heavy and stays low over the plains. The relatively warmer air already in the area is lifted by the heavy mass of cold air making it warmer in the Black Hills. For Black Hills area road information call (605) 673-4948 or #511 on your cell phone.

The chart below will give you the weather history at Mount Rushmore. You will find information on temperatures and precipitation. All temperatures listed are Fahrenheit.

Month

High

Low

Precip.

Inches

January

37

18

snow

5-15*

February

40

20

snow

5-15*

March

45

26

snow/rain

8-12*

April

54

33

snow/rain

5-10*

May

64

42

rain/fog

4.5

June

74

51

thunderstorm

6

July

81

58

thunderstorm

4

August

79

57

thunderstorm

2

September

69

47

rain/snow

1.75

October

58

37

rain/snow

1

November

44

27

snow/rain

5*

December

37

18

snow

5*

*Inches of snow in January and February is equal to .5 to .65 inches of moisture, March is about 1 inch and April is 2.25inches. November is .35 inches and December .75 inches.

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Page updated 06/23/2004
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