Monthly outlook for Heron, MT: average high 59.5°, average low 38.6°. That is 1.2° above the climate normal for October. Precipitation is expected on 1 day (about 0.8 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 8 October (73.8°), the coolest 16 October (28°).
59.5°/38.6°
Average high / low
+1.2°
Above normal
1 / 6
Wet days / normal
0.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 October – 17 October
56.2°
58.5°
-1.3°
18 October – 27 October
65.1°
54°
+6.2°
28 October – 6 November
at normal
47.4°
—
October records over 66 years
86.2°1 October 1992All-time high
4.3°25 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Noxon (11 mi).
Fri, 0964° / 40°0
64 °
Heron, Friday, 9 October
Overcast. High 64°, low 40°.
Pressure29.59 inHg
Wind7.1 mph SW
Humidity42%
Visibility6.2 mi
Dew point40°
Sat, 1057° / 31°0.01
57 °
Heron, Saturday, 10 October
Light rain. High 57°, low 31°.
Pressure29.80 inHg
Wind1.3 mph SW
Humidity58%
Visibility4.4 mi
Dew point32°
Sun, 1148° / 39°0.03
48 °
Heron, Sunday, 11 October
Light snow. High 48°, low 39°.
Pressure30.03 inHg
Wind7.7 mph NE
Humidity69%
Visibility6.2 mi
Dew point26°
Mon, 1257° / 33°0
57 °
Heron, Monday, 12 October
Clear. High 57°, low 33°.
Pressure29.97 inHg
Wind2.7 mph NE
Humidity60%
Visibility6.2 mi
Dew point30°
Tue, 1361° / 37°0
61 °
Heron, Tuesday, 13 October
Clear. High 61°, low 37°.
Pressure30.03 inHg
Wind2.7 mph W
Humidity55%
Visibility—
Dew point36°
Wed, 1442° / 40°0.78
42 °
Heron, Wednesday, 14 October
Snow. High 42°, low 40°.
Pressure29.91 inHg
Wind4.1 mph W
Humidity97%
Visibility—
Dew point40°
Thu, 1548° / 33°0.02
48 °
Heron, Thursday, 15 October
Light snow. High 48°, low 33°.
Pressure30.53 inHg
Wind3.3 mph NE
Humidity83%
Visibility—
Dew point40°
Fri, 1651° / 28°0
51 °
Heron, Friday, 16 October
Clear. High 51°, low 28°.
Pressure30.59 inHg
Wind4.5 mph NE
Humidity58%
Visibility—
Dew point29°
Sat, 1760° / 31°0
60 °
Heron, Saturday, 17 October
Clear. High 60°, low 31°.
Pressure30.27 inHg
Wind4.7 mph E
Humidity50%
Visibility—
Dew point31°
Sun, 1860° / 38°0
60 °
Heron, Sunday, 18 October
Clear. High 60°, low 38°.
Pressure30.06 inHg
Wind5.3 mph SW
Humidity51%
Visibility—
Dew point37°
Mon, 1959° / 45°0
59 °
Heron, Monday, 19 October
Overcast. High 59°, low 45°.
Pressure30.18 inHg
Wind3.4 mph SW
Humidity65%
Visibility—
Dew point44°
Tue, 2066° / 42°0
66 °
Heron, Tuesday, 20 October
Clear. High 66°, low 42°.
Pressure30.18 inHg
Wind2.9 mph SW
Humidity51%
Visibility—
Dew point40°
Wed, 2169° / 46°0
69 °
Heron, Wednesday, 21 October
Overcast. High 69°, low 46°.
Pressure30.09 inHg
Wind3.4 mph SW
Humidity42%
Visibility—
Dew point38°
Thu, 2271° / 45°0
71 °
Heron, Thursday, 22 October
Clear. High 71°, low 45°.
Pressure30.06 inHg
Wind3.1 mph SW
Humidity41%
Visibility—
Dew point38°
Fri, 2365° / 48°0
65 °
Heron, Friday, 23 October
Overcast. High 65°, low 48°.
Pressure30.00 inHg
Wind3.7 mph W
Humidity50%
Visibility—
Dew point40°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 2453° / 38°0.11
53 °
Heron, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high53°
Average low38°
Average precipitation0.11 in
Chance of precipitation40%
Record high69° (1986)
Record low15° (2020)
Sun, 2553° / 37°0.14
53 °
Heron, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high53°
Average low37°
Average precipitation0.14 in
Chance of precipitation48%
Record high70° (2005)
Record low4° (2020)
Mon, 2651° / 38°0.18
51 °
Heron, Monday, 26 October
Climate normal for this date — 60-year average.
Average high51°
Average low38°
Average precipitation0.18 in
Chance of precipitation50%
Record high70° (1986)
Record low17° (2020)
Tue, 2750° / 36°0.15
50 °
Heron, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high50°
Average low36°
Average precipitation0.15 in
Chance of precipitation45%
Record high67° (1965)
Record low19° (1970)
Wed, 2850° / 36°0.15
50 °
Heron, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high50°
Average low36°
Average precipitation0.15 in
Chance of precipitation52%
Record high63° (1983)
Record low15° (1971)
Thu, 2948° / 35°0.17
48 °
Heron, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high48°
Average low35°
Average precipitation0.17 in
Chance of precipitation52%
Record high67° (1962)
Record low5° (1991)
Fri, 3048° / 34°0.14
48 °
Heron, Friday, 30 October
Climate normal for this date — 60-year average.
Average high48°
Average low34°
Average precipitation0.14 in
Chance of precipitation45%
Record high65° (2008)
Record low5° (1991)
Sat, 3147° / 35°0.2
47 °
Heron, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high47°
Average low35°
Average precipitation0.2 in
Chance of precipitation52%
Record high65° (1988)
Record low14° (1984)
Sun, 0147° / 34°0.19
47 °
Heron, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.19 in
Chance of precipitation50%
Record high65° (1965)
Record low9° (1991)
Mon, 0247° / 34°0.2
47 °
Heron, Monday, 2 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.2 in
Chance of precipitation48%
Record high65° (1981)
Record low1° (1991)
Tue, 0347° / 35°0.12
47 °
Heron, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high47°
Average low35°
Average precipitation0.12 in
Chance of precipitation48%
Record high62° (1981)
Record low13° (1991)
Wed, 0447° / 35°0.27
47 °
Heron, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high47°
Average low35°
Average precipitation0.27 in
Chance of precipitation57%
Record high65° (1975)
Record low10° (1973)
Thu, 0546° / 35°0.19
46 °
Heron, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high46°
Average low35°
Average precipitation0.19 in
Chance of precipitation60%
Record high67° (1975)
Record low11° (1961)
Fri, 0646° / 33°0.24
46 °
Heron, Friday, 6 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.24 in
Chance of precipitation63%
Record high62° (2012)
Record low11° (1971)
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 Heron, 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 Heron, 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.