As of 04:40 MDT

Weather in Ajax, SD

45°Current weather

Ajax, Wednesday, 14 October, 04:40

Overcast. Feels like 45°. High 50°, low 44°.

Pressure30.18 inHg
Wind0 mph N
Humidity87%
Visibility6.2 mi
Dew point41°

Monthly outlook for Ajax, SD: average high 60.8°, average low 43.1°. That is 1.4° above the climate normal for October. Precipitation is expected on 2 days (about 1.2 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 17 October (74.3°), the coolest 16 October (30.9°).

60.8°/43.1°
Average high / low
+1.4°
Above normal
2 / 3
Wet days / normal
1.2 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
14 October – 23 October62°59.5°+1.4°
24 October – 2 November58.8°54.6°+2.4°
3 November – 12 Novemberat normal49.5°—

October records over 66 years

90.3°3 October 2025All-time high
-4.2°26 October 2020All-time low

Climate normals and records are computed from the nearest reference point — Hermosa (4 mi).

Thu, 1550° / 40°0Clear
50 °Clear

Ajax, Thursday, 15 October

Clear. High 50°, low 40°.

Pressure30.36 inHg
Wind17.7 mph NW
Humidity38%
Visibility6.2 mi
Dew point21°
Fri, 1656° / 31°0Clear
56 °Clear

Ajax, Friday, 16 October

Clear. High 56°, low 31°.

Pressure30.68 inHg
Wind7.5 mph S
Humidity44%
Visibility6.2 mi
Dew point16°
Sat, 1774° / 46°0Clear
74 °Clear

Ajax, Saturday, 17 October

Clear. High 74°, low 46°.

Pressure30.03 inHg
Wind5.1 mph SE
Humidity24%
Visibility6.2 mi
Dew point30°
Sun, 1864° / 50°0Clear
64 °Clear

Ajax, Sunday, 18 October

Clear. High 64°, low 50°.

Pressure30.12 inHg
Wind12.8 mph N
Humidity36%
Visibility—
Dew point34°
Mon, 1973° / 43°0Overcast
73 °Overcast

Ajax, Monday, 19 October

Overcast. High 73°, low 43°.

Pressure29.83 inHg
Wind12.5 mph W
Humidity38%
Visibility—
Dew point38°
Tue, 2074° / 49°0Clear
74 °Clear

Ajax, Tuesday, 20 October

Clear. High 74°, low 49°.

Pressure29.91 inHg
Wind11.5 mph SW
Humidity20%
Visibility—
Dew point25°
Wed, 2158° / 46°0Overcast
58 °Overcast

Ajax, Wednesday, 21 October

Overcast. High 58°, low 46°.

Pressure30.21 inHg
Wind10.2 mph N
Humidity36%
Visibility—
Dew point27°
Thu, 2266° / 44°0Clear
66 °Clear

Ajax, Thursday, 22 October

Clear. High 66°, low 44°.

Pressure30.03 inHg
Wind22.9 mph S
Humidity45%
Visibility—
Dew point37°
Fri, 2355° / 50°0.63Rain
55 °Rain

Ajax, Friday, 23 October

Rain. High 55°, low 50°.

Pressure29.97 inHg
Wind16.9 mph S
Humidity85%
Visibility—
Dew point50°
Sat, 2448° / 39°0.55Rain
48 °Rain

Ajax, Saturday, 24 October

Rain. High 48°, low 39°.

Pressure30.33 inHg
Wind32.2 mph N
Humidity63%
Visibility—
Dew point32°
Sun, 2558° / 34°0Clear
58 °Clear

Ajax, Sunday, 25 October

Clear. High 58°, low 34°.

Pressure30.18 inHg
Wind13.6 mph S
Humidity39%
Visibility—
Dew point24°
Mon, 2659° / 42°0Clear
59 °Clear

Ajax, Monday, 26 October

Clear. High 59°, low 42°.

Pressure29.88 inHg
Wind9.9 mph SE
Humidity27%
Visibility—
Dew point21°
Tue, 2766° / 41°0Clear
66 °Clear

Ajax, Tuesday, 27 October

Clear. High 66°, low 41°.

Pressure29.71 inHg
Wind14.2 mph SW
Humidity41%
Visibility—
Dew point32°
Wed, 2859° / 45°0Partly cloudy
59 °Partly cloudy

Ajax, Wednesday, 28 October

Partly cloudy. High 59°, low 45°.

Pressure29.83 inHg
Wind11.5 mph NW
Humidity36%
Visibility—
Dew point28°
Thu, 2965° / 46°0Overcast
65 °Overcast

Ajax, Thursday, 29 October

Overcast. High 65°, low 46°.

Pressure29.56 inHg
Wind14.2 mph W
Humidity30%
Visibility—
Dew point30°
From day 17 onward the outlook is built from 60-year climate statistics
Fri, 3052° / 34°0.04Climate normal
52 °Climate normal

Ajax, Friday, 30 October

Climate normal for this date — 60-year average.

Average high52°
Average low34°
Average precipitation0.04 in
Chance of precipitation22%
Record high77° (1968)
Record low3° (1991)
Sat, 3152° / 34°0.03Climate normal
52 °Climate normal

Ajax, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high52°
Average low34°
Average precipitation0.03 in
Chance of precipitation15%
Record high74° (1990)
Record low3° (1991)
Sun, 0151° / 33°0.05Climate normal
51 °Climate normal

Ajax, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high51°
Average low33°
Average precipitation0.05 in
Chance of precipitation18%
Record high72° (1965)
Record low3° (2002)
Mon, 0251° / 32°0.04Climate normal
51 °Climate normal

Ajax, Monday, 2 November

Climate normal for this date — 60-year average.

Average high51°
Average low32°
Average precipitation0.04 in
Chance of precipitation20%
Record high75° (2008)
Record low-2° (1991)
Tue, 0351° / 33°0.04Climate normal
51 °Climate normal

Ajax, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high51°
Average low33°
Average precipitation0.04 in
Chance of precipitation20%
Record high71° (2020)
Record low2° (1991)
Wed, 0453° / 32°0.01Climate normal
53 °Climate normal

Ajax, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high53°
Average low32°
Average precipitation0.01 in
Chance of precipitation10%
Record high76° (1978)
Record low7° (1995)
Thu, 0552° / 33°0.03Climate normal
52 °Climate normal

Ajax, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high52°
Average low33°
Average precipitation0.03 in
Chance of precipitation13%
Record high76° (2020)
Record low1° (2003)
Fri, 0651° / 32°0.04Climate normal
51 °Climate normal

Ajax, Friday, 6 November

Climate normal for this date — 60-year average.

Average high51°
Average low32°
Average precipitation0.04 in
Chance of precipitation13%
Record high75° (2020)
Record low-3° (2003)
Sat, 0752° / 32°0.03Climate normal
52 °Climate normal

Ajax, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high52°
Average low32°
Average precipitation0.03 in
Chance of precipitation13%
Record high75° (1999)
Record low3° (1991)
Sun, 0850° / 31°0.06Climate normal
50 °Climate normal

Ajax, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high50°
Average low31°
Average precipitation0.06 in
Chance of precipitation20%
Record high77° (1999)
Record low3° (2003)
Mon, 0946° / 29°0.06Climate normal
46 °Climate normal

Ajax, Monday, 9 November

Climate normal for this date — 60-year average.

Average high46°
Average low29°
Average precipitation0.06 in
Chance of precipitation25%
Record high74° (2016)
Record low-3° (1966)
Tue, 1047° / 27°0.04Climate normal
47 °Climate normal

Ajax, Tuesday, 10 November

Climate normal for this date — 60-year average.

Average high47°
Average low27°
Average precipitation0.04 in
Chance of precipitation17%
Record high69° (2005)
Record low-7° (1986)
Wed, 1145° / 27°0.02Climate normal
45 °Climate normal

Ajax, Wednesday, 11 November

Climate normal for this date — 60-year average.

Average high45°
Average low27°
Average precipitation0.02 in
Chance of precipitation18%
Record high72° (2005)
Record low-7° (1986)
Thu, 1248° / 28°0.03Climate normal
48 °Climate normal

Ajax, Thursday, 12 November

Climate normal for this date — 60-year average.

Average high48°
Average low28°
Average precipitation0.03 in
Chance of precipitation15%
Record high73° (1999)
Record low-8° (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 Ajax, 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 Ajax, 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.