Old Miner's Meadow Group Use Area
Tonight: low 43 °F, frost likely.
Tonight
Worth a lookFriday, September 25, 10 p.m. to 7 a.m.
Your setup looks borderline for this night
You may feel chilly from around 5 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.
This is based on typical values for the gear types you picked, so treat it as an estimate.
Your night
- 10 p.m. to 5 a.m.ComfortableAir around you 55 to 48°F.
- 5 a.m. until morningChilly. Add a layerAir around you 39 to 37°F, frost from 6 a.m.
Every hour
- 10 p.m.55°Fcomfortable
- 11 p.m.53°Fcomfortable
- midnight52°Fcomfortable
- 1 a.m.51°Fcomfortable
- 2 a.m.50°Fcomfortable
- 3 a.m.49°Fcomfortable
- 4 a.m.48°Fcomfortable
- 5 a.m.39°Fchilly, heavy dew
- 6 a.m.37°Fchilly, frost
- 7 a.m.37°Fchilly, frost
This spot sits about 120 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.
- You have this
Underneath you
R1.5 or more
The R-value says how well a pad keeps the cold ground out.
- Worth adding
Also useful
A bag liner
Adds a few degrees to the bag you already own.
Before you sleep
- Put on a warm layer and a hat before about 5 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 (6 a.m.):
- Outside at your spot
- 43°F
- Warmth your shelter holds
- +2 °F
- Clear-sky cooling
- −1 °F
- Low spot
- −7 °F
- Air around you
- 37°F
- Your bag's comfort rating
- 39°F
- Cold ground through what you lie on
- +4 °F
- Your comfort limit
- 43°F
6 °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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