Juniper Springs Group Camp

San Bernardino National Forest, California

Tonight: low 52 °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 55°F. The coldest are in January, when 1 night in 10 drops to 15°F. Frost is common in January, February, March, April, May, October, November and December.

Typical nightCold night (1 in 10)
  1. Jan23°F 15°FBag comfortable to 15°F · frost 91% · rain or snow 20% of days
  2. Feb23°F 10°FBag comfortable to 10°F · frost 87% · rain or snow 20% of days
  3. Mar23°F 14°FBag comfortable to 15°F · frost 86% · rain or snow 27% of days
  4. Apr33°F 24°FBag comfortable to 25°F · frost 46% · rain or snow 9% of days
  5. May39°F 28°FBag comfortable to 30°F · frost 21% · rain or snow 14% of days
  6. Jun50°F 42°FBag comfortable to 45°F · frost 0% · rain or snow 11% of days
  7. Jul55°F 49°FBag comfortable to 50°F · frost 0% · rain or snow 26% of days
  8. Aug53°F 48°FBag comfortable to 50°F · frost 0% · rain or snow 23% of days
  9. Sep (this month)48°F 41°FBag comfortable to 40°F · frost 1% · rain or snow 16% of days
  10. Oct40°F 31°FBag comfortable to 30°F · frost 15% · rain or snow 9% of days
  11. Nov32°F 19°FBag comfortable to 20°F · frost 49% · rain or snow 10% of days
  12. Dec28°F 15°FBag comfortable to 15°F · frost 74% · rain or snow 15% 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.

Warm enough at the coldest hour

Your selected gear looks warm enough

About 15 °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 outside52°F
  • Moisturedry
  • Windcalm

Your night

  1. 10 p.m. until morningComfortableAir around you 61 to 54°F.
Every hour
  • 10 p.m.61°Fcomfortable
  • 11 p.m.59°Fcomfortable
  • midnight58°Fcomfortable
  • 1 a.m.57°Fcomfortable
  • 2 a.m.56°Fcomfortable
  • 3 a.m.56°Fcomfortable
  • 4 a.m.57°Fcomfortable
  • 5 a.m.56°Fcomfortable
  • 6 a.m.55°Fcomfortable
  • 7 a.m.54°Fcomfortable

This spot sits about 28 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 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.

How we estimated this

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

Outside at your spot
52°F
Warmth your shelter holds
+2 °F
Air around you
54°F
Your bag's comfort rating
39°F
Your comfort limit
39°F

15 °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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