Day 57 (D-4) Weather forecast: Important for packing

What is the weather going to be like?  What should I put in my suitcase?  Low altitudes/high altitudes, day/night!😧
Denver: https://weather.com/weather/tenday/l/Denver+CO+USCO0105:1:US
Cheyenne : https://weather.com/weather/tenday/l/Cheyenne+WY+USWY0032:1:US
Mount Rushmore: https://weather.com/weather/tenday/l/USSD0232:1:US
Rapid City: https://weather.com/weather/tenday/l/Rapid+City+SD+USSD0283:1:US
The Badlands: https://weather.com/weather/tenday/l/Badlands+Natl+Park+SD+USSD0018:1:US
Buffalo, WY:  https://weather.com/weather/tenday/l/Buffalo+WY+82834:4:US   
Cody, WY: https://weather.com/weather/tenday/l/Cody+WY+82414:4:US
YELLOWSTONE:  https://weather.com/weather/tenday/l/Yellowstone+Natl+Park+WY+USWY0183:1:US
Lake Jenny:  https://weather.com/weather/tenday/l/Jenny+Lake+10370:21:US
Salt Lake City: https://www.theweathernetwork.com/us/14-day-weather-trend/utah/salt-lake-city

The National Park Service gives us this information about the weather in Yellowstone. (Altitudes: 1600m - 3650m.  For example, we'll be at 2,240m when we visit the geyser Old Faithful.)

Spring and Fall (Americans say both Autumn and Fall)

Daytime temperatures range from 30°F to 60°F (0°C to 20°C) with overnight lows in the teens to single digits ( -5°C to -20°C).  Snow is common in the spring and fall with regular accumulations of 12 inches (30 cm) in a 24-hour period.  Be prepared for changing temperatures and weather any time of the year: more than anything else, unpredictability characterizes Yellowstone's weather.  Always be equipped with a wide range of clothing options.  Be sure to bring a warm jacket and rain gear even in the summer.

Summer

Daytime temperatures are often around 70°F (25°C) and occasionally 80°F (30°C) at lower elevations.  Nights are usually cool and temperatures may drop below freezing at higher elevations.  Thunderstorms are common in the afternoons.

Not for us, but if you are interested:

Winter

Temperatures often range from zero to 20°F (-20°C to -5°C) throughout the day.  Sub-zero temperatures are common, especially at night and at higher elevations.  The record low temperature is -66°F (-54°C).  Snowfall is highly variable.  While the average is 150 inches per year (375 cm), it is not uncommon for higher elevations to get twice that amount.

My best,
Jane
For any vocabulary, I'll let you go to www.wordreference.com 
www.wordreference.com/fr/