O'Hara Saddle Campground
Tonight: low 33 °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 49°F. The coldest are in December, when 1 night in 10 drops to 5°F. Frost is common in January, February, March, April, May, October, November and December.
- Jan18°F 3°FBag comfortable to 5°F · frost 100% · rain or snow 49% of days
- Feb18°F 6°FBag comfortable to 5°F · frost 98% · rain or snow 66% of days
- Mar23°F 12°FBag comfortable to 15°F · frost 98% · rain or snow 56% of days
- Apr27°F 17°FBag comfortable to 20°F · frost 88% · rain or snow 54% of days
- May35°F 27°FBag comfortable to 30°F · frost 34% · rain or snow 50% of days
- Jun42°F 35°FBag comfortable to 35°F · frost 4% · rain or snow 38% of days
- Jul49°F 42°FBag comfortable to 45°F · frost 0% · rain or snow 11% of days
- Aug48°F 43°FBag comfortable to 45°F · frost 0% · rain or snow 15% of days
- Sep (this month)42°F 34°FBag comfortable to 35°F · frost 7% · rain or snow 27% of days
- Oct32°F 23°FBag comfortable to 25°F · frost 50% · rain or snow 44% of days
- Nov24°F 11°FBag comfortable to 10°F · frost 86% · rain or snow 50% of days
- Dec18°F 5°FBag comfortable to 5°F · frost 97% · rain or snow 57% 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.
Your setup looks borderline for this night
You may feel chilly from around 10 p.m.
Your sleeping bag is not warm enough for this night.
Best change
Sleep in a warm layer, a hat and dry socks, and take a hot water bottle.
This is based on typical values for the gear types you picked, so treat it as an estimate.
Your night
- 10 p.m. until morningChilly. Add a layerAir around you 42 to 35°F, frost from midnight.
Every hour
- 10 p.m.42°Fchilly
- 11 p.m.41°Fchilly
- midnight39°Fchilly, frost
- 1 a.m.39°Fchilly, frost
- 2 a.m.39°Fchilly
- 3 a.m.38°Fchilly
- 4 a.m.37°Fchilly
- 5 a.m.36°Fchilly
- 6 a.m.35°Fchilly
- 7 a.m.35°Fchilly
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.
- Missing
Underneath you
R2.5 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 10 p.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.
- Bring shoes, clothes and electronics inside. Anything left out will be wet by morning.
How we estimated this
At the coldest hour (6 a.m.):
- Outside at your spot
- 33°F
- Warmth your shelter holds
- +2 °F
- Air around you
- 35°F
- Your bag's comfort rating
- 39°F
- Cold ground through what you lie on
- +4 °F
- Your comfort limit
- 43°F
8 °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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