Monthly outlook for Argonne, SD: average high 60.1°, average low 45.5°. That is 1.2° above the climate normal for October. Precipitation is expected on 5 days (about 0.5 inches), against a normal of 3 days and 1.0 inches. The warmest day looks like 10 October (85.6°), the coolest 17 October (28.1°).
60.1°/45.5°
Average high / low
+1.2°
Above normal
5 / 3
Wet days / normal
0.5 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
10 October – 19 October
62.6°
59°
+2°
20 October – 29 October
55.9°
55.2°
+0.4°
30 October – 8 November
at normal
49.3°
—
October records over 66 years
89.6°3 October 2025All-time high
10.4°27 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Carthage (8 mi).
Sun, 1183° / 60°0
83 °
Argonne, Sunday, 11 October
Overcast. High 83°, low 60°.
Pressure29.65 inHg
Wind11 mph S
Humidity39%
Visibility6.2 mi
Dew point51°
Mon, 1265° / 54°0
65 °
Argonne, Monday, 12 October
Light rain. High 65°, low 54°.
Pressure29.77 inHg
Wind7.7 mph NE
Humidity74%
Visibility6.2 mi
Dew point53°
Tue, 1358° / 48°0
58 °
Argonne, Tuesday, 13 October
Overcast. High 58°, low 48°.
Pressure30.06 inHg
Wind8.5 mph N
Humidity68%
Visibility6.2 mi
Dew point43°
Wed, 1459° / 47°0
59 °
Argonne, Wednesday, 14 October
Overcast. High 59°, low 47°.
Pressure30.27 inHg
Wind7.4 mph E
Humidity56%
Visibility—
Dew point40°
Thu, 1559° / 45°0.07
59 °
Argonne, Thursday, 15 October
Light rain. High 59°, low 45°.
Pressure30.21 inHg
Wind13.4 mph N
Humidity65%
Visibility—
Dew point46°
Fri, 1649° / 36°0.07
49 °
Argonne, Friday, 16 October
Snow. High 49°, low 36°.
Pressure30.06 inHg
Wind30.4 mph NW
Humidity75%
Visibility—
Dew point34°
Sat, 1743° / 28°0
43 °
Argonne, Saturday, 17 October
Light snow. High 43°, low 28°.
Pressure30.56 inHg
Wind19.9 mph NW
Humidity39%
Visibility—
Dew point15°
Sun, 1861° / 38°0
61 °
Argonne, Sunday, 18 October
Overcast. High 61°, low 38°.
Pressure30.00 inHg
Wind21 mph S
Humidity35%
Visibility—
Dew point26°
Mon, 1962° / 41°0
62 °
Argonne, Monday, 19 October
Clear. High 62°, low 41°.
Pressure30.12 inHg
Wind16.4 mph SE
Humidity38%
Visibility—
Dew point32°
Tue, 2062° / 49°0.29
62 °
Argonne, Tuesday, 20 October
Rain. High 62°, low 49°.
Pressure29.83 inHg
Wind20.3 mph S
Humidity58%
Visibility—
Dew point44°
Wed, 2160° / 49°0.06
60 °
Argonne, Wednesday, 21 October
Light rain. High 60°, low 49°.
Pressure29.83 inHg
Wind10.7 mph N
Humidity67%
Visibility—
Dew point48°
Thu, 2259° / 43°0
59 °
Argonne, Thursday, 22 October
Clear. High 59°, low 43°.
Pressure29.97 inHg
Wind9.6 mph SE
Humidity51%
Visibility—
Dew point37°
Fri, 2353° / 46°0.05
53 °
Argonne, Friday, 23 October
Light rain. High 53°, low 46°.
Pressure29.88 inHg
Wind18.1 mph NW
Humidity63%
Visibility—
Dew point40°
Sat, 2454° / 36°0
54 °
Argonne, Saturday, 24 October
Mostly clear. High 54°, low 36°.
Pressure30.12 inHg
Wind15.3 mph NW
Humidity49%
Visibility—
Dew point30°
Sun, 2546° / 44°0
46 °
Argonne, Sunday, 25 October
Overcast. High 46°, low 44°.
Pressure30.06 inHg
Wind10.9 mph N
Humidity80%
Visibility—
Dew point39°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2655° / 38°0.02
55 °
Argonne, Monday, 26 October
Climate normal for this date — 60-year average.
Average high55°
Average low38°
Average precipitation0.02 in
Chance of precipitation12%
Record high78° (1989)
Record low11° (2020)
Tue, 2754° / 38°0.07
54 °
Argonne, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high54°
Average low38°
Average precipitation0.07 in
Chance of precipitation28%
Record high72° (1999)
Record low10° (2020)
Wed, 2853° / 37°0.04
53 °
Argonne, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high53°
Average low37°
Average precipitation0.04 in
Chance of precipitation12%
Record high73° (2016)
Record low17° (2017)
Thu, 2952° / 37°0.06
52 °
Argonne, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high52°
Average low37°
Average precipitation0.06 in
Chance of precipitation22%
Record high68° (1978)
Record low19° (1991)
Fri, 3051° / 37°0.1
51 °
Argonne, Friday, 30 October
Climate normal for this date — 60-year average.
Average high51°
Average low37°
Average precipitation0.1 in
Chance of precipitation33%
Record high70° (1965)
Record low17° (1991)
Sat, 3151° / 35°0.05
51 °
Argonne, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high51°
Average low35°
Average precipitation0.05 in
Chance of precipitation17%
Record high72° (1990)
Record low15° (2019)
Sun, 0150° / 35°0.05
50 °
Argonne, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high50°
Average low35°
Average precipitation0.05 in
Chance of precipitation25%
Record high71° (1990)
Record low17° (2002)
Mon, 0249° / 34°0.04
49 °
Argonne, Monday, 2 November
Climate normal for this date — 60-year average.
Average high49°
Average low34°
Average precipitation0.04 in
Chance of precipitation10%
Record high72° (2022)
Record low10° (1991)
Tue, 0349° / 34°0.02
49 °
Argonne, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high49°
Average low34°
Average precipitation0.02 in
Chance of precipitation13%
Record high73° (1978)
Record low7° (1991)
Wed, 0449° / 32°0.01
49 °
Argonne, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high49°
Average low32°
Average precipitation0.01 in
Chance of precipitation8%
Record high70° (2015)
Record low-5° (1991)
Thu, 0549° / 33°0.04
49 °
Argonne, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high49°
Average low33°
Average precipitation0.04 in
Chance of precipitation23%
Record high73° (2001)
Record low12° (2003)
Fri, 0648° / 33°0.03
48 °
Argonne, Friday, 6 November
Climate normal for this date — 60-year average.
Average high48°
Average low33°
Average precipitation0.03 in
Chance of precipitation17%
Record high76° (2020)
Record low2° (2003)
Sat, 0749° / 32°0.02
49 °
Argonne, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high49°
Average low32°
Average precipitation0.02 in
Chance of precipitation12%
Record high73° (2020)
Record low3° (1991)
Sun, 0847° / 32°0.06
47 °
Argonne, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high47°
Average low32°
Average precipitation0.06 in
Chance of precipitation17%
Record high73° (1999)
Record low9° (1991)
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 Argonne, 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 Argonne, 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.