Bogley

[FlyfishermanMike]

I've always lugged my really warm one around but I'd like to go really lite this year and get a new bag. I forget, how cold does it get at nights?

^^ike

[Scott P]

I would suggest a 20 degree bag, though sometimes during rare occasions it might get colder. Anyway, here is a chart of the coldest temps I've camped for each month. Notice that many were in the Uintas:

http://www.summitpost.org/custom-object/186172/Overnight-Temperatures-in-the-Central-Rockies.html

Also, Here are some average highs and lows from the 13,123 foot elevation (4000 meters) in the Uintas (about the same altitude as the highest summits):

MONTH HIGH LOW

JAN 11/-4
FEB 13/-2
MAR 16/1
APR 24/8
MAY 32/15
JUN 42/22
JUL 52/29
AUG 50/28
SEP 42/21
OCT 31/12
NOV 19/5
DEC 14/0

Here are some average highs and lows from Mirror Lake at 10,190 feet :

MONTH HIGH LOW
JAN 23/0
FEB 25/2
MAR 29/6
APR 38/14
MAY 47/22
JUN 57/31
JUL 67/38
AUG 65/37
SEP 57/30
OCT 46/19
NOV 32/10
DEC 26/4

[Glockguy]

If you can spare the $$$ this is the uber Uintah summer bag.

http://www.westernmountaineering.com/index.cfm?section=Products&page=Sleeping%20Bags&cat=ExtremeLite%20Series&viewpost=2&ContentId=19

Full-length #5 YKK Zipper
Top Collar
4" Loft, 30° F
5 1/4" Spacing/Continuous Baffles
12 oz. Down Fill
64"/39" Shoulder/Foot Girth
1 lb. 8 oz. Total Weight

Screw Kirkham's and IME...you can get better deals online.

[stefan]

I usually use a 30 degree bag. It's very versatile as it can be used in warmer weather and can be enhanced by a liner to lower it's rating.

I have a marmot arroyo which is very similar. it packs down amazingly small.