Monthly outlook for Castner Falls, MT: average high 61.4°, average low 40.2°. That is 3.1° above the climate normal for October. Precipitation is expected on 1 day (about 0.3 inches), against a normal of 3 days and 0.6 inches. The warmest day looks like 17 October (71.3°), the coolest 14 October (31.3°).
61.4°/40.2°
Average high / low
+3.1°
Above normal
1 / 3
Wet days / normal
0.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
14 October – 23 October
61°
57.5°
+2°
24 October – 2 November
62.1°
51.7°
+5.8°
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, 1550° / 34°0
50 °
Castner Falls, Thursday, 15 October
Clear. High 50°, low 34°.
Pressure30.77 inHg
Wind0.9 mph NW
Humidity56%
Visibility6.2 mi
Dew point26°
Fri, 1670° / 36°0
70 °
Castner Falls, Friday, 16 October
Partly cloudy. High 70°, low 36°.
Pressure30.33 inHg
Wind9.5 mph S
Humidity30%
Visibility6.2 mi
Dew point30°
Sat, 1771° / 47°0
71 °
Castner Falls, Saturday, 17 October
Overcast. High 71°, low 47°.
Pressure29.97 inHg
Wind12.3 mph S
Humidity26%
Visibility6.2 mi
Dew point30°
Sun, 1863° / 41°0
63 °
Castner Falls, Sunday, 18 October
Clear. High 63°, low 41°.
Pressure30.12 inHg
Wind6.3 mph NE
Humidity48%
Visibility—
Dew point35°
Mon, 1964° / 39°0
64 °
Castner Falls, Monday, 19 October
Partly cloudy. High 64°, low 39°.
Pressure29.88 inHg
Wind7.7 mph NE
Humidity56%
Visibility—
Dew point37°
Tue, 2054° / 44°0
54 °
Castner Falls, Tuesday, 20 October
Overcast. High 54°, low 44°.
Pressure29.97 inHg
Wind7.1 mph N
Humidity44%
Visibility—
Dew point29°
Wed, 2162° / 39°0
62 °
Castner Falls, Wednesday, 21 October
Clear. High 62°, low 39°.
Pressure30.00 inHg
Wind7.4 mph S
Humidity50%
Visibility—
Dew point35°
Thu, 2270° / 46°0
70 °
Castner Falls, Thursday, 22 October
Clear. High 70°, low 46°.
Pressure29.77 inHg
Wind11.8 mph SW
Humidity29%
Visibility—
Dew point30°
Fri, 2350° / 39°0
50 °
Castner Falls, Friday, 23 October
Overcast. High 50°, low 39°.
Pressure30.18 inHg
Wind6.3 mph NW
Humidity47%
Visibility—
Dew point26°
Sat, 2463° / 37°0
63 °
Castner Falls, Saturday, 24 October
Clear. High 63°, low 37°.
Pressure30.24 inHg
Wind13.4 mph SW
Humidity25%
Visibility—
Dew point19°
Sun, 2565° / 49°0
65 °
Castner Falls, Sunday, 25 October
Overcast. High 65°, low 49°.
Pressure30.24 inHg
Wind13.7 mph SW
Humidity20%
Visibility—
Dew point19°
Mon, 2668° / 49°0
68 °
Castner Falls, Monday, 26 October
Partly cloudy. High 68°, low 49°.
Pressure29.91 inHg
Wind20.1 mph W
Humidity22%
Visibility—
Dew point24°
Tue, 2757° / 36°0.3
57 °
Castner Falls, Tuesday, 27 October
Light rain. High 57°, low 36°.
Pressure30.21 inHg
Wind18.6 mph N
Humidity96%
Visibility—
Dew point39°
Wed, 2858° / 33°0
58 °
Castner Falls, Wednesday, 28 October
Overcast. High 58°, low 33°.
Pressure29.83 inHg
Wind17 mph SW
Humidity43%
Visibility—
Dew point27°
Thu, 2962° / 44°0
62 °
Castner Falls, Thursday, 29 October
Overcast. High 62°, low 44°.
Pressure29.85 inHg
Wind11.3 mph SW
Humidity32%
Visibility—
Dew point25°
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.