Dirt Flat
Tonight: low 68 °F, calm and dry.
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 62°F. The coldest are in January, when 1 night in 10 drops to 21°F. Frost is common in January, February, March, April, November and December.
- Jan30°F 21°FBag comfortable to 20°F · frost 63% · rain or snow 34% of days
- Feb31°F 17°FBag comfortable to 20°F · frost 58% · rain or snow 31% of days
- Mar31°F 22°FBag comfortable to 25°F · frost 55% · rain or snow 43% of days
- Apr37°F 27°FBag comfortable to 25°F · frost 22% · rain or snow 27% of days
- May44°F 35°FBag comfortable to 35°F · frost 4% · rain or snow 24% of days
- Jun55°F 46°FBag comfortable to 45°F · frost 0% · rain or snow 6% of days
- Jul62°F 55°FBag comfortable to 55°F · frost 0% · rain or snow 0% of days
- Aug61°F 55°FBag comfortable to 55°F · frost 0% · rain or snow 7% of days
- Sep (this month)55°F 46°FBag comfortable to 45°F · frost 0% · rain or snow 12% of days
- Oct45°F 37°FBag comfortable to 35°F · frost 2% · rain or snow 9% of days
- Nov37°F 26°FBag comfortable to 25°F · frost 27% · rain or snow 24% of days
- Dec33°F 22°FBag comfortable to 25°F · frost 48% · rain or snow 29% 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
Good nightFriday, September 25, 10 p.m. to 7 a.m.
Your selected gear looks warm enough
About 25 °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.
Your night
- 10 p.m. until morningComfortableAir around you 68 to 64°F.
Every hour
- 10 p.m.67°Fcomfortable
- 11 p.m.65°Fcomfortable
- midnight64°Fcomfortable
- 1 a.m.65°Fcomfortable
- 2 a.m.66°Fcomfortable
- 3 a.m.67°Fcomfortable
- 4 a.m.68°Fcomfortable
- 5 a.m.67°Fcomfortable
- 6 a.m.64°Fcomfortable
- 7 a.m.64°Fcomfortable
This spot sits about 118 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.
- You have this
Sleeping bag
Comfort 60°F or colder
Usually sold as a 51° 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
- 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.
How we estimated this
At the coldest hour (7 a.m.):
- Outside at your spot
- 70°F
- Warmth your shelter holds
- +2 °F
- Clear-sky cooling
- −2 °F
- Low spot
- −7 °F
- Air around you
- 63°F
- Your bag's comfort rating
- 39°F
- Your comfort limit
- 39°F
24 °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.
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