Camping Heiner

Bayerisch Eisenstein, Bayern, Germany

Tonight: low 6 °C, frost likely.

Tonight

Worth a lookFriday, September 25, 22:00 to 07:00

Cold air collects in this hollow

Your setup looks borderline for this night

You may feel chilly from around 02:00.

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 setup Enter my exact gear ratings

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

Low outside6°C
Moisturefrost, keep your bag covered
Windcalm

Your night

22:00 to 02:00ComfortableAir around you 10 to 9°C, some dew.
02:00 until morningChilly. Add a layerAir around you 3°C, frost.

Every hour

22:009°Ccomfortable, some dew
23:0010°Ccomfortable
00:0010°Ccomfortable
01:009°Ccomfortable, some dew
02:003°Cchilly, frost
03:003°Cchilly, frost
04:003°Cchilly, frost
05:003°Cchilly, frost
06:003°Cchilly, frost
07:003°Cchilly, frost

This spot sits about 64 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+2).

What works tonight

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

Missing
Sleeping bag
Comfort 2°C or colder
The comfort rating on the label, not the limit, which is about 5 °C lower.
Amazon
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.
Amazon

Stay safe from carbon monoxideNever run the engine or use a propane or gas heater inside a car, van or tent to stay warm. Carbon monoxide builds up while you sleep and can kill without waking you. Stay warm with layers, insulation and a hot water bottle instead.

Before you sleep

Put on a warm layer and a hat before about 02:00, 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 03:00 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 (04:00):

Outside at your spot: 6°C
Warmth your shelter holds: +2 °C
Clear-sky cooling: −1 °C
Low spot: −4 °C
Air around you: 3°C

Your bag's comfort rating: 4°C
Cold ground through what you lie on: +2 °C
Your comfort limit: 6°C

3 °C 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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