Monthly outlook for Greenfield, MT: average high 55.5°, average low 38°. That is 0.6° above the climate normal for October. Precipitation is expected on 3 days (about 0.4 inches), against a normal of 3 days and 0.5 inches. The warmest day looks like 17 October (68.5°), the coolest 13 October (25.7°).
55.5°/38°
Average high / low
+0.6°
Above normal
3 / 3
Wet days / normal
0.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
12 October – 21 October
54.4°
55.6°
-0.7°
22 October – 31 October
57.5°
50.7°
+3.8°
1 November – 10 November
at normal
44.7°
—
October records over 66 years
86.2°1 October 1992All-time high
-10.5°30 October 1991All-time low
Climate normals and records are computed from the nearest reference point — Fairfield (6 mi).
Tue, 1346° / 26°0
46 °
Greenfield, Tuesday, 13 October
Clear. High 46°, low 26°.
Pressure30.09 inHg
Wind4 mph SW
Humidity76%
Visibility0.7 mi
Dew point31°
Wed, 1458° / 32°0
58 °
Greenfield, Wednesday, 14 October
Overcast. High 58°, low 32°.
Pressure30.09 inHg
Wind7.5 mph SW
Humidity54%
Visibility6.2 mi
Dew point32°
Thu, 1553° / 34°0
53 °
Greenfield, Thursday, 15 October
Clear. High 53°, low 34°.
Pressure30.65 inHg
Wind3.4 mph E
Humidity55%
Visibility6.2 mi
Dew point32°
Fri, 1668° / 40°0
68 °
Greenfield, Friday, 16 October
Mostly clear. High 68°, low 40°.
Pressure30.27 inHg
Wind13.5 mph S
Humidity36%
Visibility6.2 mi
Dew point34°
Sat, 1768° / 48°0
68 °
Greenfield, Saturday, 17 October
Overcast. High 68°, low 48°.
Pressure29.88 inHg
Wind15.4 mph SW
Humidity31%
Visibility—
Dew point30°
Sun, 1859° / 45°0
59 °
Greenfield, Sunday, 18 October
Clear. High 59°, low 45°.
Pressure29.91 inHg
Wind12.7 mph SW
Humidity36%
Visibility—
Dew point28°
Mon, 1962° / 39°0
62 °
Greenfield, Monday, 19 October
Overcast. High 62°, low 39°.
Pressure29.80 inHg
Wind14.3 mph S
Humidity37%
Visibility—
Dew point27°
Tue, 2055° / 43°0.17
55 °
Greenfield, Tuesday, 20 October
Light rain. High 55°, low 43°.
Pressure29.59 inHg
Wind13.5 mph N
Humidity59%
Visibility—
Dew point37°
Wed, 2141° / 36°0.19
41 °
Greenfield, Wednesday, 21 October
Rain. High 41°, low 36°.
Pressure30.06 inHg
Wind12.5 mph N
Humidity73%
Visibility—
Dew point31°
Thu, 2247° / 34°0
47 °
Greenfield, Thursday, 22 October
Overcast. High 47°, low 34°.
Pressure30.15 inHg
Wind6.4 mph S
Humidity59%
Visibility—
Dew point29°
Fri, 2355° / 38°0
55 °
Greenfield, Friday, 23 October
Overcast. High 55°, low 38°.
Pressure29.80 inHg
Wind11.4 mph S
Humidity53%
Visibility—
Dew point31°
Sat, 2456° / 41°0
56 °
Greenfield, Saturday, 24 October
Clear. High 56°, low 41°.
Pressure30.30 inHg
Wind23 mph NW
Humidity43%
Visibility—
Dew point28°
Sun, 2561° / 38°0
61 °
Greenfield, Sunday, 25 October
Mostly clear. High 61°, low 38°.
Pressure30.39 inHg
Wind14.1 mph SW
Humidity47%
Visibility—
Dew point31°
Mon, 2665° / 44°0
65 °
Greenfield, Monday, 26 October
Partly cloudy. High 65°, low 44°.
Pressure30.27 inHg
Wind11 mph SW
Humidity37%
Visibility—
Dew point30°
Tue, 2761° / 45°0
61 °
Greenfield, Tuesday, 27 October
Overcast. High 61°, low 45°.
Pressure30.24 inHg
Wind5.5 mph S
Humidity46%
Visibility—
Dew point34°
From day 17 onward the outlook is built from 60-year climate statistics
Wed, 2850° / 30°0.03
50 °
Greenfield, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high50°
Average low30°
Average precipitation0.03 in
Chance of precipitation17%
Record high71° (2008)
Record low-1° (1991)
Thu, 2948° / 29°0.03
48 °
Greenfield, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high48°
Average low29°
Average precipitation0.03 in
Chance of precipitation18%
Record high69° (1987)
Record low-2° (1991)
Fri, 3048° / 28°0.02
48 °
Greenfield, Friday, 30 October
Climate normal for this date — 60-year average.
Average high48°
Average low28°
Average precipitation0.02 in
Chance of precipitation13%
Record high70° (1962)
Record low-10° (1991)
Sat, 3147° / 29°0.03
47 °
Greenfield, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high47°
Average low29°
Average precipitation0.03 in
Chance of precipitation20%
Record high67° (2014)
Record low-8° (2002)
Sun, 0147° / 29°0.03
47 °
Greenfield, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high47°
Average low29°
Average precipitation0.03 in
Chance of precipitation17%
Record high69° (2025)
Record low-10° (1984)
Mon, 0247° / 29°0.03
47 °
Greenfield, Monday, 2 November
Climate normal for this date — 60-year average.
Average high47°
Average low29°
Average precipitation0.03 in
Chance of precipitation22%
Record high66° (1981)
Record low-7° (1991)
Tue, 0347° / 29°0.02
47 °
Greenfield, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high47°
Average low29°
Average precipitation0.02 in
Chance of precipitation13%
Record high69° (1962)
Record low-4° (1991)
Wed, 0447° / 29°0.03
47 °
Greenfield, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high47°
Average low29°
Average precipitation0.03 in
Chance of precipitation18%
Record high66° (2010)
Record low2° (2017)
Thu, 0546° / 28°0.03
46 °
Greenfield, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high46°
Average low28°
Average precipitation0.03 in
Chance of precipitation22%
Record high68° (2010)
Record low-13° (2003)
Fri, 0644° / 27°0.03
44 °
Greenfield, Friday, 6 November
Climate normal for this date — 60-year average.
Average high44°
Average low27°
Average precipitation0.03 in
Chance of precipitation20%
Record high66° (2010)
Record low-9° (2003)
Sat, 0744° / 28°0.03
44 °
Greenfield, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high44°
Average low28°
Average precipitation0.03 in
Chance of precipitation20%
Record high65° (2010)
Record low-4° (1973)
Sun, 0843° / 26°0.04
43 °
Greenfield, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high43°
Average low26°
Average precipitation0.04 in
Chance of precipitation25%
Record high64° (2004)
Record low-5° (1973)
Mon, 0942° / 25°0.05
42 °
Greenfield, Monday, 9 November
Climate normal for this date — 60-year average.
Average high42°
Average low25°
Average precipitation0.05 in
Chance of precipitation25%
Record high66° (2016)
Record low-2° (1986)
Tue, 1041° / 25°0.02
41 °
Greenfield, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high41°
Average low25°
Average precipitation0.02 in
Chance of precipitation27%
Record high64° (2025)
Record low-18° (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 Greenfield, 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 Greenfield, 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.