Red Shale Campground

Custer Gallatin National Forest, Montana

Tonight: low 51 °F, breezy.

Nights by month

Night lows from 2016 to 2025: a typical night, and the cold one that comes 1 night in 10.

The mildest nights are in July, typically 63°F. The coldest are in February, when 1 night in 10 drops to -9°F. Frost is common in January, February, March, April, October, November and December.

Typical nightCold night (1 in 10)
  1. Jan18°F -7°FBag comfortable to -5°F · frost 99% · rain or snow 21% of days
  2. Feb14°F -9°FBag comfortable to -10°F · frost 95% · rain or snow 27% of days
  3. Mar26°F 10°FBag comfortable to 10°F · frost 82% · rain or snow 24% of days
  4. Apr34°F 22°FBag comfortable to 20°F · frost 43% · rain or snow 30% of days
  5. May45°F 35°FBag comfortable to 35°F · frost 3% · rain or snow 34% of days
  6. Jun56°F 48°FBag comfortable to 50°F · frost 0% · rain or snow 23% of days
  7. Jul63°F 56°FBag comfortable to 55°F · frost 0% · rain or snow 17% of days
  8. Aug61°F 53°FBag comfortable to 55°F · frost 0% · rain or snow 16% of days
  9. Sep (this month)52°F 43°FBag comfortable to 45°F · frost 0% · rain or snow 18% of days
  10. Oct38°F 26°FBag comfortable to 25°F · frost 26% · rain or snow 23% of days
  11. Nov27°F 16°FBag comfortable to 15°F · frost 74% · rain or snow 19% of days
  12. Dec21°F 2°FBag comfortable to 0°F · frost 97% · rain or snow 21% of days

| = 32°F

History: ERA5 and ERA5-Land reanalysis via Open-Meteo, corrected to the site's elevation. Bag rating: the comfort rating that keeps you warm in a tent on 9 of 10 nights that month.

Tonight

Worth a lookFriday, September 25, 10 p.m. to 7 a.m.

Warm enough at the coldest hour

Your selected gear looks warm enough

About 13 °F to spare at the coldest hour.

This is based on typical values for the gear types you picked, so treat it as an estimate.

  • Low outside51°F
  • Moisturedry
  • Windgusty at times

Your night

  1. 10 p.m. until morningComfortableAir around you 75 to 52°F, gusty from 3 a.m. (up to 36 mph).
Every hour
  • 10 p.m.75°Fcomfortable
  • 11 p.m.71°Fcomfortable
  • midnight69°Fcomfortable
  • 1 a.m.66°Fcomfortable
  • 2 a.m.64°Fcomfortable
  • 3 a.m.62°Fcomfortable, gusty
  • 4 a.m.60°Fcomfortable, gusty
  • 5 a.m.56°Fcomfortable
  • 6 a.m.53°Fcomfortable
  • 7 a.m.52°Fcomfortable

Times are local time at your spot (GMT-6).

What works tonight

The gear this night calls for, for someone who sleeps like you.

  • You have this

    Sleeping bag

    Comfort 50°F or colder

    Usually sold as a 41° bag. The number in a bag's name is the limit, not the comfort.

  • You have this

    Underneath you

    R1 or more

    The R-value says how well a pad keeps the cold ground out.

Before you sleep

  • Stake out every guyline and point the low, narrow end of the tent into the wind.
  • Gusts get strong during the night. Do not pitch or park under dead trees or big dead branches.
How we estimated this

At the coldest hour (7 a.m.):

Outside at your spot
51°F
Warmth your shelter holds
+2 °F
Clear-sky cooling
−1 °F
Air around you
52°F
Your bag's comfort rating
39°F
Your comfort limit
39°F

13 °F to spare, so warm enough.

Assumptions

  • Bag categories use typical ratings as sold: summer about 50 °F (10 °C), 3-season about 30 °F (-1 °C), winter about 15 °F (-9 °C). The number in a bag's name is usually its lower limit, so its comfort rating is about 9 °F (5 °C) warmer.
  • What you lie on: foam mat about R2, thin air pad about R1.5, insulated pad about R3.5, winter pad R5 and up, van bed about R4, air mattress about R0.5. Colder ground needs a higher R-value.
  • Shelters hold a few degrees early in the night and less towards morning. Wind and clear, calm skies take warmth away.
  • Weather: Open-Meteo forecast for your spot, on a grid of a few kilometers, corrected to its height.
  • These are rules of thumb, not measurements. People and gear vary.

A forecast, not a promise. Mountains, valleys and water make their own weather, so trust what you see and feel on site. Terms and liability

Checked for a double-wall tent, a 3-season bag and a thin air pad. Check your own gear here.

Book or read more on Recreation.gov

Campgrounds nearby