Monthly outlook for Fairfax, SD: average high 56.6°, average low 42.2°. That is 0.8° below the climate normal for October. Precipitation is expected on 5 days (about 3.4 inches), against a normal of 3 days and 0.9 inches. The warmest day looks like 21 October (71.2°), the coolest 27 October (30.1°).
56.6°/42.2°
Average high / low
−0.8°
Below normal
5 / 3
Wet days / normal
3.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
16 October – 25 October
63.2°
59.7°
+1.9°
26 October – 4 November
45.6°
53.9°
-4.6°
5 November – 14 November
at normal
49°
—
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).
Sat, 1765° / 38°0
65 °
Fairfax, Saturday, 17 October
Clear. High 65°, low 38°.
Pressure30.27 inHg
Wind17.9 mph S
Humidity40%
Visibility6.2 mi
Dew point32°
Sun, 1869° / 49°0
69 °
Fairfax, Sunday, 18 October
Clear. High 69°, low 49°.
Pressure30.06 inHg
Wind12.5 mph S
Humidity44%
Visibility6.2 mi
Dew point39°
Mon, 1965° / 45°0
65 °
Fairfax, Monday, 19 October
Overcast. High 65°, low 45°.
Pressure30.09 inHg
Wind5.5 mph S
Humidity62%
Visibility6.2 mi
Dew point45°
Tue, 2067° / 48°0
67 °
Fairfax, Tuesday, 20 October
Clear. High 67°, low 48°.
Pressure30.09 inHg
Wind10.2 mph S
Humidity66%
Visibility6.2 mi
Dew point48°
Wed, 2171° / 52°0
71 °
Fairfax, Wednesday, 21 October
Clear. High 71°, low 52°.
Pressure30.06 inHg
Wind9.9 mph S
Humidity57%
Visibility—
Dew point51°
Thu, 2269° / 48°0
69 °
Fairfax, Thursday, 22 October
Clear. High 69°, low 48°.
Pressure30.18 inHg
Wind9.8 mph E
Humidity34%
Visibility—
Dew point34°
Fri, 2368° / 50°0.16
68 °
Fairfax, Friday, 23 October
Light rain. High 68°, low 50°.
Pressure29.91 inHg
Wind21.2 mph SE
Humidity89%
Visibility—
Dew point56°
Sat, 2460° / 49°0.01
60 °
Fairfax, Saturday, 24 October
Light rain. High 60°, low 49°.
Pressure30.12 inHg
Wind15.6 mph NW
Humidity44%
Visibility—
Dew point35°
Sun, 2549° / 32°1.51
49 °
Fairfax, Sunday, 25 October
Rain. High 49°, low 32°.
Pressure30.24 inHg
Wind17.6 mph N
Humidity87%
Visibility—
Dew point36°
Mon, 2635° / 31°0.26
35 °
Fairfax, Monday, 26 October
Snow. High 35°, low 31°.
Pressure30.30 inHg
Wind17.5 mph N
Humidity100%
Visibility—
Dew point33°
Tue, 2742° / 30°0.02
42 °
Fairfax, Tuesday, 27 October
Light rain. High 42°, low 30°.
Pressure30.15 inHg
Wind12.1 mph S
Humidity81%
Visibility—
Dew point35°
Wed, 2849° / 41°0.74
49 °
Fairfax, Wednesday, 28 October
Rain. High 49°, low 41°.
Pressure29.74 inHg
Wind12.5 mph NW
Humidity97%
Visibility—
Dew point45°
Thu, 2953° / 45°0
53 °
Fairfax, Thursday, 29 October
Overcast. High 53°, low 45°.
Pressure29.91 inHg
Wind14.8 mph W
Humidity69%
Visibility—
Dew point42°
Fri, 3051° / 40°0
51 °
Fairfax, Friday, 30 October
Overcast. High 51°, low 40°.
Pressure30.24 inHg
Wind11.4 mph NE
Humidity54%
Visibility—
Dew point32°
Sat, 3143° / 41°0.65
43 °
Fairfax, Saturday, 31 October
Rain. High 43°, low 41°.
Pressure30.15 inHg
Wind19.8 mph NE
Humidity94%
Visibility—
Dew point41°
From day 17 onward the outlook is built from 60-year climate statistics
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)
Tue, 1047° / 30°0.04
47 °
Fairfax, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high47°
Average low30°
Average precipitation0.04 in
Chance of precipitation20%
Record high68° (1989)
Record low1° (1986)
Wed, 1145° / 29°0.06
45 °
Fairfax, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high45°
Average low29°
Average precipitation0.06 in
Chance of precipitation23%
Record high74° (2005)
Record low-6° (1986)
Thu, 1246° / 29°0.05
46 °
Fairfax, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high46°
Average low29°
Average precipitation0.05 in
Chance of precipitation20%
Record high72° (1999)
Record low1° (1986)
Fri, 1348° / 31°0.03
48 °
Fairfax, Friday, 13 November
Climate normal for this date — 60-year average.
Average high48°
Average low31°
Average precipitation0.03 in
Chance of precipitation18%
Record high71° (1999)
Record low-11° (1986)
Sat, 1448° / 31°0.02
48 °
Fairfax, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high48°
Average low31°
Average precipitation0.02 in
Chance of precipitation13%
Record high80° (2025)
Record low9° (2000)
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.