Monthly outlook for Castner Falls, MT: average high 56.1°, average low 36.7°. That is 0.1° above the climate normal for October. Precipitation is expected on 2 days (about 1.1 inches), against a normal of 3 days and 0.6 inches. The warmest day looks like 17 October (71.4°), the coolest 24 October (25.4°).
56.1°/36.7°
Average high / low
+0.1°
Above normal
2 / 3
Wet days / normal
1.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
14 October – 23 October
59.1°
57.5°
+0.9°
24 October – 2 November
51°
51.7°
-0.4°
3 November – 12 November
at normal
46°
—
October records over 66 years
88.9°1 October 1992All-time high
-10.7°30 October 1991All-time low
Climate normals and records are computed from the nearest reference point — Ulm (8 mi).
Thu, 1545° / 38°0
45 °
Castner Falls, Thursday, 15 October
Clear. High 45°, low 38°.
Pressure30.74 inHg
Wind1.5 mph NW
Humidity52%
Visibility6.2 mi
Dew point25°
Fri, 1671° / 40°0
71 °
Castner Falls, Friday, 16 October
Partly cloudy. High 71°, low 40°.
Pressure30.33 inHg
Wind9.8 mph S
Humidity29%
Visibility6.2 mi
Dew point32°
Sat, 1771° / 47°0
71 °
Castner Falls, Saturday, 17 October
Overcast. High 71°, low 47°.
Pressure29.94 inHg
Wind10.2 mph SW
Humidity25%
Visibility6.2 mi
Dew point30°
Sun, 1862° / 43°0
62 °
Castner Falls, Sunday, 18 October
Mostly clear. High 62°, low 43°.
Pressure30.12 inHg
Wind1.1 mph W
Humidity54%
Visibility6.2 mi
Dew point37°
Mon, 1971° / 40°0
71 °
Castner Falls, Monday, 19 October
Mostly clear. High 71°, low 40°.
Pressure29.88 inHg
Wind5 mph SW
Humidity42%
Visibility—
Dew point35°
Tue, 2054° / 40°0
54 °
Castner Falls, Tuesday, 20 October
Overcast. High 54°, low 40°.
Pressure29.94 inHg
Wind4.9 mph S
Humidity48%
Visibility—
Dew point33°
Wed, 2165° / 38°0
65 °
Castner Falls, Wednesday, 21 October
Partly cloudy. High 65°, low 38°.
Pressure29.71 inHg
Wind9 mph SW
Humidity44%
Visibility—
Dew point33°
Thu, 2255° / 43°0
55 °
Castner Falls, Thursday, 22 October
Overcast. High 55°, low 43°.
Pressure29.74 inHg
Wind20.7 mph W
Humidity34%
Visibility—
Dew point26°
Fri, 2339° / 32°0.59
39 °
Castner Falls, Friday, 23 October
Snow. High 39°, low 32°.
Pressure30.24 inHg
Wind10.2 mph NW
Humidity90%
Visibility—
Dew point33°
Sat, 2443° / 25°0
43 °
Castner Falls, Saturday, 24 October
Overcast. High 43°, low 25°.
Pressure30.50 inHg
Wind13.2 mph SW
Humidity77%
Visibility—
Dew point29°
Sun, 2546° / 29°0
46 °
Castner Falls, Sunday, 25 October
Overcast. High 46°, low 29°.
Pressure30.33 inHg
Wind12.9 mph S
Humidity51%
Visibility—
Dew point24°
Mon, 2651° / 35°0
51 °
Castner Falls, Monday, 26 October
Overcast. High 51°, low 35°.
Pressure30.30 inHg
Wind7.8 mph S
Humidity47%
Visibility—
Dew point25°
Tue, 2758° / 38°0
58 °
Castner Falls, Tuesday, 27 October
Partly cloudy. High 58°, low 38°.
Pressure29.80 inHg
Wind18.1 mph SW
Humidity47%
Visibility—
Dew point31°
Wed, 2854° / 35°0.49
54 °
Castner Falls, Wednesday, 28 October
Rain. High 54°, low 35°.
Pressure30.12 inHg
Wind13.6 mph W
Humidity96%
Visibility—
Dew point38°
Thu, 2955° / 34°0
55 °
Castner Falls, Thursday, 29 October
Overcast. High 55°, low 34°.
Pressure29.68 inHg
Wind11.9 mph SW
Humidity51%
Visibility—
Dew point29°
From day 17 onward the outlook is built from 60-year climate statistics
Fri, 3050° / 31°0.02
50 °
Castner Falls, Friday, 30 October
Climate normal for this date — 60-year average.
Average high50°
Average low31°
Average precipitation0.02 in
Chance of precipitation13%
Record high71° (1962)
Record low-11° (1991)
Sat, 3149° / 32°0.03
49 °
Castner Falls, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high49°
Average low32°
Average precipitation0.03 in
Chance of precipitation18%
Record high71° (2008)
Record low-7° (2002)
Sun, 0149° / 31°0.03
49 °
Castner Falls, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high49°
Average low31°
Average precipitation0.03 in
Chance of precipitation18%
Record high72° (2025)
Record low-5° (1984)
Mon, 0249° / 31°0.02
49 °
Castner Falls, Monday, 2 November
Climate normal for this date — 60-year average.
Average high49°
Average low31°
Average precipitation0.02 in
Chance of precipitation17%
Record high68° (1981)
Record low-13° (1991)
Tue, 0349° / 32°0.03
49 °
Castner Falls, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high49°
Average low32°
Average precipitation0.03 in
Chance of precipitation18%
Record high69° (1962)
Record low-1° (1991)
Wed, 0449° / 32°0.04
49 °
Castner Falls, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high49°
Average low32°
Average precipitation0.04 in
Chance of precipitation20%
Record high69° (2021)
Record low2° (2003)
Thu, 0548° / 31°0.04
48 °
Castner Falls, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high48°
Average low31°
Average precipitation0.04 in
Chance of precipitation25%
Record high69° (2010)
Record low-10° (2003)
Fri, 0646° / 29°0.04
46 °
Castner Falls, Friday, 6 November
Climate normal for this date — 60-year average.
Average high46°
Average low29°
Average precipitation0.04 in
Chance of precipitation23%
Record high70° (2010)
Record low-6° (2003)
Sat, 0746° / 30°0.02
46 °
Castner Falls, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high46°
Average low30°
Average precipitation0.02 in
Chance of precipitation18%
Record high69° (2010)
Record low-9° (1973)
Sun, 0845° / 29°0.04
45 °
Castner Falls, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high45°
Average low29°
Average precipitation0.04 in
Chance of precipitation27%
Record high66° (2004)
Record low-5° (1973)
Mon, 0944° / 27°0.05
44 °
Castner Falls, Monday, 9 November
Climate normal for this date — 60-year average.
Average high44°
Average low27°
Average precipitation0.05 in
Chance of precipitation28%
Record high68° (2016)
Record low0° (1986)
Tue, 1043° / 27°0.03
43 °
Castner Falls, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high43°
Average low27°
Average precipitation0.03 in
Chance of precipitation20%
Record high65° (2025)
Record low-14° (1986)
Wed, 1144° / 26°0.03
44 °
Castner Falls, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high44°
Average low26°
Average precipitation0.03 in
Chance of precipitation23%
Record high66° (1990)
Record low-6° (2000)
Thu, 1245° / 27°0.02
45 °
Castner Falls, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high45°
Average low27°
Average precipitation0.02 in
Chance of precipitation15%
Record high70° (1999)
Record low-17° (1986)
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 Castner Falls, 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 Castner Falls, 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.