Weather in Keystone, MT
Keystone, Thursday, 8 October, 02:34
Clear. Feels like 37°. High 68°, low 34°.
Monthly outlook for Keystone, MT: average high 49.1°, average low 30.3°. That is 5.3° below the climate normal for October. Precipitation is expected on 6 days (about 1.6 inches), against a normal of 5 days and 1.1 inches. The warmest day looks like 8 October (67.7°), the coolest 12 October (23°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 October – 17 October | 49.6° | 59.5° | -5.5° |
| 18 October – 27 October | 48.3° | 55.5° | -4° |
| 28 October – 6 November | at normal | 49° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — St. Regis (8 mi).
0.03
Keystone, Friday, 9 October
Light rain. High 62°, low 35°.
0.07
Keystone, Saturday, 10 October
Snow. High 51°, low 32°.
0.12Keystone, Sunday, 11 October
Light snow. High 33°, low 29°.
0
Keystone, Monday, 12 October
Overcast. High 43°, low 23°.
0
Keystone, Tuesday, 13 October
Clear. High 52°, low 26°.
0.06Keystone, Wednesday, 14 October
Snow. High 42°, low 31°.
0Keystone, Thursday, 15 October
Overcast. High 39°, low 32°.
0Keystone, Friday, 16 October
Clear. High 53°, low 25°.
0
Keystone, Saturday, 17 October
Partly cloudy. High 54°, low 29°.
0
Keystone, Sunday, 18 October
Mostly clear. High 59°, low 31°.
0Keystone, Monday, 19 October
Clear. High 60°, low 33°.
0Keystone, Tuesday, 20 October
Partly cloudy. High 60°, low 35°.
0.82Keystone, Wednesday, 21 October
Rain. High 41°, low 34°.
0.11Keystone, Thursday, 22 October
Light snow. High 33°, low 27°.
0.37Keystone, Friday, 23 October
Snow. High 36°, low 29°.
0.07Keystone, Saturday, 24 October
Climate normal for this date — 60-year average.
0.09
Keystone, Sunday, 25 October
Climate normal for this date — 60-year average.
0.09Keystone, Monday, 26 October
Climate normal for this date — 60-year average.
0.09Keystone, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.09Keystone, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.1Keystone, Thursday, 29 October
Climate normal for this date — 60-year average.
0.08Keystone, Friday, 30 October
Climate normal for this date — 60-year average.
0.11Keystone, Saturday, 31 October
Climate normal for this date — 60-year average.
0.11Keystone, Sunday, 1 November
Climate normal for this date — 60-year average.
0.12Keystone, Monday, 2 November
Climate normal for this date — 60-year average.
0.06Keystone, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.13Keystone, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.12Keystone, Thursday, 5 November
Climate normal for this date — 60-year average.
0.14Keystone, Friday, 6 November
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Keystone, MT are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Keystone, MT since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
55°Weather in Annapolis, MD58°Weather in Atlanta, GA62°Weather in Augusta, ME52°Weather in Austin, TX69°Weather in Baton Rouge, LA70°Weather in Bismarck, ND51°Weather in Boise, ID63°Weather in Boston, MA55°Weather in Carson City, NV60°Weather in Charleston, WV56°Weather in Charlotte Amalie, VI78°Weather in Cheyenne, WY53°Weather in Columbia, SC57°Weather in Columbus, OH55°Weather in Concord, NH51°Weather in Denver, CO61°Weather in Des Moines, IA55°Weather in Dover, DE58°Weather in Frankfort, KY58°Weather in Harrisburg, PA52°Weather in Hartford, CT55°Weather in Helena, MT49°Weather in Honolulu, HI74°Weather in Indianapolis, IN56°Weather in Jackson, MS63°Weather in Jefferson City, MO60°Weather in Juneau, AK37°Weather in Lansing, MI52°Weather in Lincoln, NE56°Weather in Little Rock, AR62°Weather in Madison, WI52°Weather in Montgomery, AL64°Weather in Montpelier, VT49°Weather in Nashville, TN60°Weather in Oklahoma City, OK68°Weather in Olympia, WA51°Weather in Phoenix, AZ85°Weather in Pierre, SD48°Weather in Providence, RI56°Weather in Raleigh, NC55°Weather in Richmond, VA59°Weather in Sacramento, CA73°Weather in Salem, OR56°Weather in Salt Lake City, UT66°Weather in San Juan, PR78°Weather in Santa Fe, NM55°Weather in Springfield, IL52°Weather in St. Paul, MN53°Weather in Tallahassee, FL71°Weather in Topeka, KS61°Weather in Trenton, NJ53°Weather in Washington, DC58°42°Weather in Hoffmanville, MT52°Weather in Holker, MT53°Weather in Holland, MT59°Weather in Hoosac, MT44°Weather in Hungry Joe, MT49°Weather in Hunters Hot Springs, MT44°Weather in Indian Arrow, MT49°Weather in Iverness, MT51°Weather in Jimtown, MT51°Weather in Kelley, MT49°Weather in Kenilworth, MT49°Weather in Kershaw, MT45°Weather in Kingley, MT51°Weather in Kingston, MT46°Weather in Kintyre, MT44°Weather in Knox, MT54°Weather in Koyl, MT58°Weather in Lanark, MT43°Weather in Laurin, MT43°