As of 02:45 MDT

Weather in Trojan, SD

40°

Trojan, Sunday, 11 October, 02:45

Overcast. Feels like 40°. High 54°, low 40°.

Pressure29.80 inHg

Wind0 mph N

Humidity66%

Visibility6.2 mi

Dew point30°

See detailed hourly forecast

Monthly outlook for Trojan, SD: average high 54.8°, average low 35.3°. That is 0.4° below the climate normal for October. Precipitation is expected on 2 days (about 0.5 inches), against a normal of 4 days and 1.0 inches. The warmest day looks like 19 October (65.9°), the coolest 16 October (22.2°).

54.8°/35.3°

Average high / low

−0.4°

Below normal

2 / 4

Wet days / normal

0.5 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
11 October – 20 October	54.5°	56.3°	-1°
21 October – 30 October	55.3°	52.9°	+1.3°
31 October – 9 November	at normal	47.4°	—

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).

Mon, 1248° / 34°

0.02

48 °

Trojan, Monday, 12 October

Light rain. High 48°, low 34°.

Pressure29.94 inHg

Wind10.1 mph NW

Humidity94%

Visibility5.5 mi

Dew point41°

Tue, 1347° / 34°

0.03

47 °

Trojan, Tuesday, 13 October

Light rain. High 47°, low 34°.

Pressure30.00 inHg

Wind3.3 mph NE

Humidity77%

Visibility6.2 mi

Dew point38°

Wed, 1451° / 38°

0.15

51 °

Trojan, Wednesday, 14 October

Rain. High 51°, low 38°.

Pressure30.18 inHg

Wind6.2 mph E

Humidity72%

Visibility6.2 mi

Dew point41°

Thu, 1544° / 37°

0.27

44 °

Trojan, Thursday, 15 October

Light rain. High 44°, low 37°.

Pressure30.45 inHg

Wind8.6 mph N

Humidity97%

Visibility—

Dew point39°

Fri, 1655° / 22°

55 °

Trojan, Friday, 16 October

Clear. High 55°, low 22°.

Pressure30.53 inHg

Wind7.7 mph S

Humidity33%

Visibility—

Dew point22°

Sat, 1758° / 26°

58 °

Trojan, Saturday, 17 October

Clear. High 58°, low 26°.

Pressure30.15 inHg

Wind10.4 mph SW

Humidity22%

Visibility—

Dew point14°

Sun, 1863° / 45°

63 °

Trojan, Sunday, 18 October

Overcast. High 63°, low 45°.

Pressure29.97 inHg

Wind10.2 mph NW

Humidity20%

Visibility—

Dew point19°

Mon, 1966° / 45°

66 °

Trojan, Monday, 19 October

Partly cloudy. High 66°, low 45°.

Pressure29.85 inHg

Wind7 mph S

Humidity19%

Visibility—

Dew point19°

Tue, 2058° / 42°

58 °

Trojan, Tuesday, 20 October

Partly cloudy. High 58°, low 42°.

Pressure29.85 inHg

Wind7.6 mph SW

Humidity34%

Visibility—

Dew point27°

Wed, 2152° / 36°

52 °

Trojan, Wednesday, 21 October

Clear. High 52°, low 36°.

Pressure30.09 inHg

Wind8.4 mph NW

Humidity31%

Visibility—

Dew point19°

Thu, 2262° / 34°

62 °

Trojan, Thursday, 22 October

Overcast. High 62°, low 34°.

Pressure30.03 inHg

Wind8.9 mph S

Humidity30%

Visibility—

Dew point24°

Fri, 2356° / 36°

56 °

Trojan, Friday, 23 October

Partly cloudy. High 56°, low 36°.

Pressure30.03 inHg

Wind19.3 mph NW

Humidity57%

Visibility—

Dew point33°

Sat, 2447° / 28°

47 °

Trojan, Saturday, 24 October

Overcast. High 47°, low 28°.

Pressure30.39 inHg

Wind7.4 mph W

Humidity25%

Visibility—

Dew point8°

Sun, 2555° / 32°

55 °

Trojan, Sunday, 25 October

Mostly clear. High 55°, low 32°.

Pressure30.27 inHg

Wind10.8 mph NW

Humidity25%

Visibility—

Dew point17°

Mon, 2660° / 37°

60 °

Trojan, Monday, 26 October

Clear. High 60°, low 37°.

Pressure30.15 inHg

Wind5 mph S

Humidity31%

Visibility—

Dew point25°

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

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)

Sun, 0846° / 30°

0.06

46 °

Trojan, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high46°

Average low30°

Average precipitation0.06 in

Chance of precipitation22%

Record high74° (1999)

Record low7° (2000)

Mon, 0943° / 28°

0.07

43 °

Trojan, Monday, 9 November

Climate normal for this date — 60-year average.

Average high43°

Average low28°

Average precipitation0.07 in

Chance of precipitation28%

Record high70° (2016)

Record low0° (1966)

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.