Little Dry Island Cabin
Tonight: low 41 °F, heavy dew.
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 54°F. The coldest are in February, when 1 night in 10 drops to 13°F. Frost is common in January, February, March, April, October, November and December.
- Jan31°F 17°FBag comfortable to 15°F · frost 55% · rain or snow 67% of days
- Feb28°F 13°FBag comfortable to 15°F · frost 67% · rain or snow 58% of days
- Mar32°F 20°FBag comfortable to 20°F · frost 55% · rain or snow 53% of days
- Apr35°F 30°FBag comfortable to 30°F · frost 20% · rain or snow 64% of days
- May42°F 37°FBag comfortable to 40°F · frost 0% · rain or snow 58% of days
- Jun49°F 44°FBag comfortable to 45°F · frost 0% · rain or snow 60% of days
- Jul54°F 49°FBag comfortable to 50°F · frost 0% · rain or snow 56% of days
- Aug53°F 48°FBag comfortable to 50°F · frost 0% · rain or snow 56% of days
- Sep (this month)48°F 42°FBag comfortable to 40°F · frost 0% · rain or snow 62% of days
- Oct39°F 32°FBag comfortable to 30°F · frost 12% · rain or snow 63% of days
- Nov34°F 25°FBag comfortable to 25°F · frost 38% · rain or snow 74% of days
- Dec30°F 8°FBag comfortable to 10°F · frost 58% · rain or snow 63% 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 5 °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 47 to 44°F, heavy dew.
Every hour
- 10 p.m.47°Fcomfortable, heavy dew
- 11 p.m.46°Fcomfortable, heavy dew
- midnight44°Fcomfortable, heavy dew
- 1 a.m.45°Fcomfortable
- 2 a.m.45°Fcomfortable
- 3 a.m.45°Fcomfortable
- 4 a.m.46°Fcomfortable
- 5 a.m.47°Fcomfortable
- 6 a.m.47°Fcomfortable
- 7 a.m.47°Fcomfortable
Times are local time at your spot (GMT-8).
What works tonight
The gear this night calls for, for someone who sleeps like you.
- You have this
Sleeping bag
Comfort 40°F or colder
Usually sold as a 31° 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.
Before you sleep
- 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 (midnight):
- Outside at your spot
- 42°F
- Warmth your shelter holds
- +4 °F
- Clear-sky cooling
- −2 °F
- Air around you
- 44°F
- Your bag's comfort rating
- 39°F
- Your comfort limit
- 39°F
5 °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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