Montana Climate Atlas

National Weather Service Great Falls, MT

 

Table of Contents

 

Introduction

1.1 Climate data and station list

 

Metadata and NWS history

2.1 Description

2.2 NWS History

 

Temperature

3.1 Description

3.2 Temperature extremes

3.3 Hourly Temperatures

3.4 Short-term temperature changes and extremes

3.5 Frost dates

3.6 Soil temperature and moisture

Average Spring/Fall Frost Dates

 

Precipitation

4.1 Description

4.2 Probability return rates of precipitation

4.3 Precipitation variability

4.4 Monthly and 24-hour record precipitation

 

Snow

5.1 Description

5.2 Snowfall records

5.3 Snow on ground averages

Montana Snowfall Impact Scale (MONTSIS)

 

Severe Weather

6.1 Description

6.2 Thunderstorms

6.3 Lightning

6.4 Tornadoes

6.5 Hail

6.6 Winter Storms

6.7 Ice Storms

6.8 Microbursts

6.9 Dust Devils

6.10 Avalanches

6.11 Floods

Severe Weather Statistics by County

 

Clouds

7.1 Description

7.2 Hourly Cloudiness

7.3 Monthly Cloud Statistics

 

Humidity

8.1 Description

8.2 Mean hourly dew point values

8.3 Record dew point values

8.4 Mean hourly relative humidity

 

Evapotranspiration

9.1 Description

9.2 Evapotranspiration

 

Wind

10.1 Description

10.2 Effectiveness of high winds at altitude (wind load)

10.3 Wind power and pressure differences due to elevation

10.4 Mean hourly winds

10.5 Mean hourly wind direction and wind roses

10.6 Chinooks and other strong winds

10.7 Average Seasonal wind speeds

 

Pressure

11.1 Description

11.2 Mean hourly pressure

 

Wind Chill

12.1 Description

12.2 Wind Chill climatology

12.3 Mean hourly wind chill values

 

Visibility

13.1 Description

13.1.1 Fog

 

Upper air

14.1 Description

14.2 Radiosonde

14.3 Upper air climatology

 

 

Sources:

National Climatic Data Center

National Resources Conservation Service

Western Region Climate Center

National Weather Service