Snugnight

Whitehouse Campground

Nez Perce-Clearwater National Forests, Idaho

Tonight: low 39 °F, frost likely.

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 52°F. The coldest are in December, when 1 night in 10 drops to 3°F. Frost is common in January, February, March, April, May, October, November and December.

Typical nightCold night (1 in 10)
  1. Jan20°F 5°FBag comfortable to 5°F · frost 98% · rain or snow 50% of days
  2. Feb20°F 6°FBag comfortable to 5°F · frost 89% · rain or snow 68% of days
  3. Mar25°F 13°FBag comfortable to 15°F · frost 87% · rain or snow 55% of days
  4. Apr30°F 20°FBag comfortable to 20°F · frost 68% · rain or snow 52% of days
  5. May35°F 29°FBag comfortable to 30°F · frost 24% · rain or snow 43% of days
  6. Jun44°F 36°FBag comfortable to 35°F · frost 3% · rain or snow 42% of days
  7. Jul52°F 45°FBag comfortable to 45°F · frost 0% · rain or snow 14% of days
  8. Aug52°F 46°FBag comfortable to 45°F · frost 0% · rain or snow 19% of days
  9. Sep45°F 37°FBag comfortable to 35°F · frost 3% · rain or snow 28% of days
  10. Oct35°F 21°FBag comfortable to 20°F · frost 39% · rain or snow 45% of days
  11. Nov21°F 6°FBag comfortable to 5°F · frost 82% · rain or snow 52% of days
  12. Dec17°F 3°FBag comfortable to 5°F · frost 93% · rain or snow 60% 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.

Cold air collects in this hollow

Your setup looks borderline for this night

You may feel chilly from around 2 a.m.

Your spot sits in a hollow where cold air collects at night.

Best change

Move 20 to 50 meters higher, away from the valley floor or creek.

  • On clear, calm nights it is often several degrees warmer there.
Change my setupEnter my exact gear ratings

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

  • Low outside39°F
  • Moisturefrost, keep your bag covered
  • Windcalm

Your night

  1. 10 p.m. to 2 a.m.ComfortableAir around you 53 to 45°F, some dew from 1 a.m.
  2. 2 a.m. to 3 a.m.Chilly. Add a layerAir around you 38°F, frost.
  3. 3 a.m. to 7 a.m.ComfortableAir around you 46 to 42°F.
  4. 7 a.m. until morningChilly. Add a layerAir around you 41°F.
Every hour
  • 10 p.m.53°Fcomfortable
  • 11 p.m.52°Fcomfortable
  • midnight49°Fcomfortable
  • 1 a.m.45°Fcomfortable, some dew
  • 2 a.m.38°Fchilly, frost
  • 3 a.m.46°Fcomfortable
  • 4 a.m.44°Fcomfortable
  • 5 a.m.43°Fcomfortable
  • 6 a.m.42°Fcomfortable
  • 7 a.m.41°Fchilly

This spot sits about 82 m below the land around it. On clear, calm nights cold air pools here, so expect it colder and wetter than the forecast.

Times are local time at your spot (GMT-7).

What works tonight

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

  • Missing

    Sleeping bag

    Comfort 35°F or colder

    Usually sold as a 26° bag. The number in a bag's name is the limit, not the comfort.

    REIAmazon
  • Missing

    Underneath you

    R2.5 or more

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

    REIAmazon
  • Worth adding

    Also useful

    A bag liner

    Adds a few degrees to the bag you already own.

    REIAmazon

Before you sleep

  • Put on a warm layer and a hat before about 2 a.m., or go to bed already wearing them.
  • Eat a proper meal with some fat before bed. Your body keeps burning it through the night.
  • Pee right before you get in your bag. Getting out at 3 a.m. in the cold is worse.
  • Sleep in dry clothes, not the ones you wore all day. Damp fabric pulls heat out of you.
  • Your spot sits lower than the ground around it. On a clear, calm night cold air drains into spots like this, so expect it colder and wetter than the forecast. If you can, move a little higher up, away from the creek or valley floor.
  • Bring shoes, clothes and electronics inside. Anything left out will be wet by morning.
  • Open the tent vents and keep the door zip open a bit at the top. Some condensation inside is normal on a night like this, so bring a small towel to wipe it off.
How we estimated this

At the coldest hour (2 a.m.):

Outside at your spot
42°F
Warmth your shelter holds
+4 °F
Clear-sky cooling
−1 °F
Low spot
−6 °F
Air around you
39°F
Your bag's comfort rating
39°F
Cold ground through what you lie on
+4 °F
Your comfort limit
43°F

4 °F short, so you will likely be cold.

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.

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