As of 21:59 MDT

Weather in Trojan, SD

66°

Trojan, Friday, 9 October, 21:59

Clear. Feels like 63°. High 77°, low 41°.

Pressure29.56 inHg

Wind9.2 mph SW

Humidity16%

Visibility6.2 mi

Dew point20°

See detailed hourly forecast

Monthly outlook for Trojan, SD: average high 51.9°, average low 33.6°. That is 2.4° below the climate normal for October. Precipitation is expected on 7 days (about 0.9 inches), against a normal of 4 days and 1.1 inches. The warmest day looks like 9 October (77°), the coolest 17 October (13.1°).

51.9°/33.6°

Average high / low

−2.4°

Below normal

7 / 4

Wet days / normal

0.9 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 October – 18 October	54.4°	56.5°	-1.2°
19 October – 28 October	47.8°	54.5°	-3.8°
29 October – 7 November	at normal	48.3°	—

October records over 66 years

86.9°4 October 1963All-time high

-5.4°30 October 1991All-time low

Climate normals and records are computed from the nearest reference point — Mountain Plains (9 mi).

Sat, 1076° / 51°

0.02

76 °

Trojan, Saturday, 10 October

Light rain. High 76°, low 51°.

Pressure29.53 inHg

Wind11.7 mph SW

Humidity22%

Visibility6.2 mi

Dew point34°

Sun, 1151° / 43°

0.06

51 °

Trojan, Sunday, 11 October

Light rain. High 51°, low 43°.

Pressure29.83 inHg

Wind5.3 mph N

Humidity75%

Visibility6.2 mi

Dew point43°

Mon, 1251° / 37°

0.05

51 °

Trojan, Monday, 12 October

Light rain. High 51°, low 37°.

Pressure29.83 inHg

Wind4.3 mph N

Humidity82%

Visibility0.3 mi

Dew point43°

Tue, 1349° / 36°

0.15

49 °

Trojan, Tuesday, 13 October

Rain. High 49°, low 36°.

Pressure30.03 inHg

Wind4.2 mph NE

Humidity79%

Visibility6.2 mi

Dew point40°

Wed, 1454° / 40°

54 °

Trojan, Wednesday, 14 October

Overcast. High 54°, low 40°.

Pressure30.21 inHg

Wind8.2 mph SE

Humidity70%

Visibility—

Dew point40°

Thu, 1551° / 30°

0.19

51 °

Trojan, Thursday, 15 October

Snow. High 51°, low 30°.

Pressure30.21 inHg

Wind20.7 mph NW

Humidity70%

Visibility—

Dew point40°

Fri, 1627° / 19°

0.15

27 °

Trojan, Friday, 16 October

Light snow. High 27°, low 19°.

Pressure30.56 inHg

Wind23.6 mph NW

Humidity67%

Visibility—

Dew point16°

Sat, 1752° / 13°

52 °

Trojan, Saturday, 17 October

Clear. High 52°, low 13°.

Pressure30.12 inHg

Wind13.4 mph SW

Humidity34%

Visibility—

Dew point19°

Sun, 1856° / 38°

56 °

Trojan, Sunday, 18 October

Overcast. High 56°, low 38°.

Pressure29.97 inHg

Wind7.1 mph S

Humidity30%

Visibility—

Dew point23°

Mon, 1959° / 37°

59 °

Trojan, Monday, 19 October

Overcast. High 59°, low 37°.

Pressure29.80 inHg

Wind15.1 mph S

Humidity34%

Visibility—

Dew point29°

Tue, 2055° / 37°

55 °

Trojan, Tuesday, 20 October

Overcast. High 55°, low 37°.

Pressure29.68 inHg

Wind8 mph SW

Humidity35%

Visibility—

Dew point25°

Wed, 2141° / 30°

0.19

41 °

Trojan, Wednesday, 21 October

Snow. High 41°, low 30°.

Pressure30.09 inHg

Wind15 mph NW

Humidity67%

Visibility—

Dew point28°

Thu, 2251° / 31°

51 °

Trojan, Thursday, 22 October

Partly cloudy. High 51°, low 31°.

Pressure29.77 inHg

Wind8.6 mph W

Humidity32%

Visibility—

Dew point20°

Fri, 2336° / 28°

0.13

36 °

Trojan, Friday, 23 October

Snow. High 36°, low 28°.

Pressure30.18 inHg

Wind18.4 mph NW

Humidity71%

Visibility—

Dew point26°

Sat, 2445° / 27°

0.01

45 °

Trojan, Saturday, 24 October

Light snow. High 45°, low 27°.

Pressure30.15 inHg

Wind15.5 mph NW

Humidity37%

Visibility—

Dew point15°

From day 17 onward the outlook is built from 60-year climate statistics

Sun, 2555° / 36°

0.03

55 °

Trojan, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high55°

Average low36°

Average precipitation0.03 in

Chance of precipitation15%

Record high75° (1989)

Record low2° (2020)

Mon, 2654° / 35°

0.07

54 °

Trojan, Monday, 26 October

Climate normal for this date — 60-year average.

Average high54°

Average low35°

Average precipitation0.07 in

Chance of precipitation22%

Record high72° (1960)

Record low-3° (2020)

Tue, 2752° / 33°

0.05

52 °

Trojan, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high52°

Average low33°

Average precipitation0.05 in

Chance of precipitation27%

Record high75° (2016)

Record low14° (2023)

Wed, 2852° / 34°

0.06

52 °

Trojan, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high52°

Average low34°

Average precipitation0.06 in

Chance of precipitation22%

Record high74° (2016)

Record low7° (1991)

Thu, 2950° / 33°

0.11

50 °

Trojan, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high50°

Average low33°

Average precipitation0.11 in

Chance of precipitation37%

Record high76° (1968)

Record low-2° (1991)

Fri, 3048° / 31°

0.04

48 °

Trojan, Friday, 30 October

Climate normal for this date — 60-year average.

Average high48°

Average low31°

Average precipitation0.04 in

Chance of precipitation27%

Record high73° (1968)

Record low-5° (1991)

Sat, 3148° / 31°

0.05

48 °

Trojan, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high48°

Average low31°

Average precipitation0.05 in

Chance of precipitation23%

Record high71° (1999)

Record low1° (1991)

Sun, 0148° / 31°

0.08

48 °

Trojan, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high48°

Average low31°

Average precipitation0.08 in

Chance of precipitation25%

Record high70° (1965)

Record low0° (2002)

Mon, 0247° / 31°

0.05

47 °

Trojan, Monday, 2 November

Climate normal for this date — 60-year average.

Average high47°

Average low31°

Average precipitation0.05 in

Chance of precipitation25%

Record high73° (2008)

Record low-8° (1991)

Tue, 0347° / 31°

0.04

47 °

Trojan, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high47°

Average low31°

Average precipitation0.04 in

Chance of precipitation23%

Record high71° (2020)

Record low-1° (1991)

Wed, 0450° / 31°

0.02

50 °

Trojan, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high50°

Average low31°

Average precipitation0.02 in

Chance of precipitation17%

Record high71° (1978)

Record low8° (1967)

Thu, 0548° / 31°

0.04

48 °

Trojan, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high48°

Average low31°

Average precipitation0.04 in

Chance of precipitation25%

Record high72° (2020)

Record low3° (2003)

Fri, 0648° / 30°

0.06

48 °

Trojan, Friday, 6 November

Climate normal for this date — 60-year average.

Average high48°

Average low30°

Average precipitation0.06 in

Chance of precipitation18%

Record high70° (2020)

Record low7° (1991)

Sat, 0748° / 30°

0.04

48 °

Trojan, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high48°

Average low30°

Average precipitation0.04 in

Chance of precipitation17%

Record high73° (1999)

Record low5° (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 Trojan, 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 Trojan, 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.