Monthly outlook for Fairfax, SD: average high 63.9°, average low 46.1°. That is 2° above the climate normal for October. Precipitation is expected on 2 days (about 0.2 inches), against a normal of 3 days and 1.0 inches. The warmest day looks like 20 October (77.2°), the coolest 26 October (34.2°).
63.9°/46.1°
Average high / low
+2°
Above normal
2 / 3
Wet days / normal
0.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
11 October – 20 October
67.4°
61.4°
+3.3°
21 October – 30 October
58.1°
57.2°
+0.5°
31 October – 9 November
at normal
51.5°
—
October records over 66 years
91.8°2 October 1997All-time high
9.9°27 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Butte (8 mi).
Mon, 1265° / 49°0
65 °
Fairfax, Monday, 12 October
Mostly clear. High 65°, low 49°.
Pressure29.71 inHg
Wind11 mph NW
Humidity65%
Visibility6.2 mi
Dew point51°
Tue, 1357° / 42°0
57 °
Fairfax, Tuesday, 13 October
Overcast. High 57°, low 42°.
Pressure30.03 inHg
Wind7 mph N
Humidity60%
Visibility6.2 mi
Dew point40°
Wed, 1461° / 45°0
61 °
Fairfax, Wednesday, 14 October
Mostly clear. High 61°, low 45°.
Pressure30.21 inHg
Wind6.2 mph NE
Humidity53%
Visibility6.2 mi
Dew point39°
Thu, 1565° / 50°0.12
65 °
Fairfax, Thursday, 15 October
Light rain. High 65°, low 50°.
Pressure30.27 inHg
Wind10 mph NW
Humidity78%
Visibility6.2 mi
Dew point47°
Fri, 1656° / 42°0
56 °
Fairfax, Friday, 16 October
Clear. High 56°, low 42°.
Pressure30.77 inHg
Wind16.8 mph N
Humidity46%
Visibility—
Dew point30°
Sat, 1767° / 43°0
67 °
Fairfax, Saturday, 17 October
Clear. High 67°, low 43°.
Pressure30.15 inHg
Wind20.6 mph S
Humidity31%
Visibility—
Dew point27°
Sun, 1877° / 49°0
77 °
Fairfax, Sunday, 18 October
Clear. High 77°, low 49°.
Pressure29.91 inHg
Wind18.8 mph SW
Humidity25%
Visibility—
Dew point31°
Mon, 1974° / 51°0
74 °
Fairfax, Monday, 19 October
Mostly clear. High 74°, low 51°.
Pressure29.94 inHg
Wind11.2 mph SE
Humidity37%
Visibility—
Dew point40°
Tue, 2077° / 52°0
77 °
Fairfax, Tuesday, 20 October
Light rain. High 77°, low 52°.
Pressure29.65 inHg
Wind18.9 mph S
Humidity41%
Visibility—
Dew point45°
Wed, 2157° / 51°0.1
57 °
Fairfax, Wednesday, 21 October
Light rain. High 57°, low 51°.
Pressure29.88 inHg
Wind15.4 mph NW
Humidity61%
Visibility—
Dew point39°
Thu, 2260° / 45°0
60 °
Fairfax, Thursday, 22 October
Partly cloudy. High 60°, low 45°.
Pressure29.97 inHg
Wind24.9 mph NW
Humidity27%
Visibility—
Dew point22°
Fri, 2356° / 40°0
56 °
Fairfax, Friday, 23 October
Clear. High 56°, low 40°.
Pressure30.21 inHg
Wind13.8 mph NW
Humidity30%
Visibility—
Dew point20°
Sat, 2465° / 44°0
65 °
Fairfax, Saturday, 24 October
Overcast. High 65°, low 44°.
Pressure29.65 inHg
Wind17 mph S
Humidity38%
Visibility—
Dew point33°
Sun, 2557° / 44°0
57 °
Fairfax, Sunday, 25 October
Clear. High 57°, low 44°.
Pressure29.85 inHg
Wind19.8 mph N
Humidity40%
Visibility—
Dew point30°
Mon, 2654° / 34°0
54 °
Fairfax, Monday, 26 October
Clear. High 54°, low 34°.
Pressure30.18 inHg
Wind7.6 mph NW
Humidity43%
Visibility—
Dew point26°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2757° / 39°0.04
57 °
Fairfax, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high57°
Average low39°
Average precipitation0.04 in
Chance of precipitation12%
Record high78° (2016)
Record low10° (2020)
Wed, 2856° / 38°0.04
56 °
Fairfax, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high56°
Average low38°
Average precipitation0.04 in
Chance of precipitation18%
Record high80° (2016)
Record low19° (2017)
Thu, 2955° / 38°0.07
55 °
Fairfax, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high55°
Average low38°
Average precipitation0.07 in
Chance of precipitation25%
Record high74° (1978)
Record low19° (1991)
Fri, 3053° / 37°0.1
53 °
Fairfax, Friday, 30 October
Climate normal for this date — 60-year average.
Average high53°
Average low37°
Average precipitation0.1 in
Chance of precipitation28%
Record high76° (1965)
Record low16° (1991)
Sat, 3153° / 36°0.06
53 °
Fairfax, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high53°
Average low36°
Average precipitation0.06 in
Chance of precipitation17%
Record high84° (2016)
Record low14° (2002)
Sun, 0152° / 36°0.04
52 °
Fairfax, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high52°
Average low36°
Average precipitation0.04 in
Chance of precipitation12%
Record high77° (1990)
Record low10° (2002)
Mon, 0252° / 36°0.05
52 °
Fairfax, Monday, 2 November
Climate normal for this date — 60-year average.
Average high52°
Average low36°
Average precipitation0.05 in
Chance of precipitation20%
Record high76° (2005)
Record low8° (1991)
Tue, 0351° / 35°0.05
51 °
Fairfax, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high51°
Average low35°
Average precipitation0.05 in
Chance of precipitation17%
Record high74° (1978)
Record low3° (1991)
Wed, 0452° / 33°0.01
52 °
Fairfax, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high52°
Average low33°
Average precipitation0.01 in
Chance of precipitation5%
Record high74° (1978)
Record low-10° (1991)
Thu, 0552° / 35°0.03
52 °
Fairfax, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high52°
Average low35°
Average precipitation0.03 in
Chance of precipitation12%
Record high76° (2020)
Record low15° (2003)
Fri, 0652° / 34°0.02
52 °
Fairfax, Friday, 6 November
Climate normal for this date — 60-year average.
Average high52°
Average low34°
Average precipitation0.02 in
Chance of precipitation12%
Record high80° (2020)
Record low7° (2003)
Sat, 0752° / 34°0.02
52 °
Fairfax, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high52°
Average low34°
Average precipitation0.02 in
Chance of precipitation13%
Record high77° (2020)
Record low-3° (1991)
Sun, 0851° / 34°0.06
51 °
Fairfax, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high51°
Average low34°
Average precipitation0.06 in
Chance of precipitation13%
Record high76° (2006)
Record low2° (1991)
Mon, 0948° / 33°0.09
48 °
Fairfax, Monday, 9 November
Climate normal for this date — 60-year average.
Average high48°
Average low33°
Average precipitation0.09 in
Chance of precipitation23%
Record high71° (2001)
Record low11° (2018)
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 Fairfax, SD 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 Fairfax, SD 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.