As of 11:40 MDT

Weather in Decker, MT

73°

Decker, Wednesday, 7 October, 11:40

Partly cloudy. Feels like 71°. High 78°, low 47°.

Pressure30.09 inHg

Wind3.2 mph E

Humidity21%

Visibility6.2 mi

Dew point31°

See detailed hourly forecast

Monthly outlook for Decker, MT: average high 60.5°, average low 39.8°. That is 0.5° above the climate normal for October. Precipitation is expected on 4 days (about 2.1 inches), against a normal of 4 days and 0.9 inches. The warmest day looks like 9 October (86°), the coolest 17 October (29.8°).

60.5°/39.8°

Average high / low

+0.5°

Above normal

4 / 4

Wet days / normal

2.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
7 October – 16 October	61.7°	60.2°	+0.8°
17 October – 26 October	58.5°	57.8°	+0.4°
27 October – 5 November	at normal	51.1°	—

October records over 66 years

89.2°1 October 2011All-time high

-9.9°30 October 1991All-time low

Thu, 0882° / 44°

82 °

Decker, Thursday, 8 October

Clear. High 82°, low 44°.

Pressure29.94 inHg

Wind3.2 mph NW

Humidity20%

Visibility6.2 mi

Dew point32°

Fri, 0986° / 51°

86 °

Decker, Friday, 9 October

Partly cloudy. High 86°, low 51°.

Pressure29.56 inHg

Wind4.5 mph S

Humidity17%

Visibility6.2 mi

Dew point29°

Sat, 1069° / 54°

69 °

Decker, Saturday, 10 October

Overcast. High 69°, low 54°.

Pressure29.56 inHg

Wind8.3 mph NE

Humidity28%

Visibility6.2 mi

Dew point32°

Sun, 1149° / 34°

0.27

49 °

Decker, Sunday, 11 October

Snow. High 49°, low 34°.

Pressure30.12 inHg

Wind11.1 mph N

Humidity85%

Visibility—

Dew point36°

Mon, 1234° / 30°

0.49

34 °

Decker, Monday, 12 October

Snow. High 34°, low 30°.

Pressure30.33 inHg

Wind10 mph NE

Humidity94%

Visibility—

Dew point31°

Tue, 1367° / 31°

67 °

Decker, Tuesday, 13 October

Clear. High 67°, low 31°.

Pressure29.91 inHg

Wind6.3 mph N

Humidity47%

Visibility—

Dew point34°

Wed, 1469° / 51°

0.12

69 °

Decker, Wednesday, 14 October

Light rain. High 69°, low 51°.

Pressure29.47 inHg

Wind9.9 mph NW

Humidity33%

Visibility—

Dew point36°

Thu, 1544° / 33°

1.22

44 °

Decker, Thursday, 15 October

Snow. High 44°, low 33°.

Pressure30.18 inHg

Wind21.5 mph NW

Humidity85%

Visibility—

Dew point31°

Fri, 1639° / 33°

0.01

39 °

Decker, Friday, 16 October

Snow. High 39°, low 33°.

Pressure30.42 inHg

Wind14.8 mph NW

Humidity76%

Visibility—

Dew point29°

Sat, 1745° / 30°

45 °

Decker, Saturday, 17 October

Overcast. High 45°, low 30°.

Pressure30.27 inHg

Wind6.3 mph S

Humidity55%

Visibility—

Dew point25°

Sun, 1854° / 32°

54 °

Decker, Sunday, 18 October

Clear. High 54°, low 32°.

Pressure30.09 inHg

Wind6.2 mph SE

Humidity44%

Visibility—

Dew point26°

Mon, 1962° / 37°

62 °

Decker, Monday, 19 October

Clear. High 62°, low 37°.

Pressure29.91 inHg

Wind3.3 mph SW

Humidity39%

Visibility—

Dew point29°

Tue, 2060° / 43°

60 °

Decker, Tuesday, 20 October

Clear. High 60°, low 43°.

Pressure30.12 inHg

Wind10.2 mph NW

Humidity34%

Visibility—

Dew point28°

Wed, 2161° / 42°

61 °

Decker, Wednesday, 21 October

Overcast. High 61°, low 42°.

Pressure30.15 inHg

Wind5.4 mph E

Humidity43%

Visibility—

Dew point32°

Thu, 2269° / 45°

69 °

Decker, Thursday, 22 October

Clear. High 69°, low 45°.

Pressure30.00 inHg

Wind12 mph SE

Humidity49%

Visibility—

Dew point41°

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

Fri, 2357° / 34°

0.04

57 °

Decker, Friday, 23 October

Climate normal for this date — 60-year average.

Average high57°

Average low34°

Average precipitation0.04 in

Chance of precipitation20%

Record high79° (2003)

Record low12° (2020)

Sat, 2456° / 34°

0.04

56 °

Decker, Saturday, 24 October

Climate normal for this date — 60-year average.

Average high56°

Average low34°

Average precipitation0.04 in

Chance of precipitation25%

Record high77° (2007)

Record low15° (2020)

Sun, 2557° / 34°

0.03

57 °

Decker, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high57°

Average low34°

Average precipitation0.03 in

Chance of precipitation18%

Record high77° (2017)

Record low-3° (2020)

Mon, 2655° / 34°

0.06

55 °

Decker, Monday, 26 October

Climate normal for this date — 60-year average.

Average high55°

Average low34°

Average precipitation0.06 in

Chance of precipitation22%

Record high74° (1983)

Record low-7° (2020)

Tue, 2754° / 32°

0.04

54 °

Decker, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high54°

Average low32°

Average precipitation0.04 in

Chance of precipitation20%

Record high75° (2016)

Record low6° (2023)

Wed, 2853° / 32°

0.06

53 °

Decker, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high53°

Average low32°

Average precipitation0.06 in

Chance of precipitation27%

Record high77° (1990)

Record low10° (1991)

Thu, 2951° / 32°

0.09

51 °

Decker, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high51°

Average low32°

Average precipitation0.09 in

Chance of precipitation35%

Record high74° (1968)

Record low3° (1991)

Fri, 3051° / 29°

0.04

51 °

Decker, Friday, 30 October

Climate normal for this date — 60-year average.

Average high51°

Average low29°

Average precipitation0.04 in

Chance of precipitation25%

Record high73° (1965)

Record low-10° (1991)

Sat, 3151° / 30°

0.04

51 °

Decker, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high51°

Average low30°

Average precipitation0.04 in

Chance of precipitation23%

Record high75° (1999)

Record low3° (1991)

Sun, 0150° / 30°

0.05

50 °

Decker, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high50°

Average low30°

Average precipitation0.05 in

Chance of precipitation22%

Record high73° (1965)

Record low3° (1991)

Mon, 0250° / 29°

0.04

50 °

Decker, Monday, 2 November

Climate normal for this date — 60-year average.

Average high50°

Average low29°

Average precipitation0.04 in

Chance of precipitation20%

Record high73° (1965)

Record low-7° (1991)

Tue, 0350° / 29°

0.03

50 °

Decker, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high50°

Average low29°

Average precipitation0.03 in

Chance of precipitation18%

Record high70° (2020)

Record low-2° (1961)

Wed, 0452° / 29°

0.03

52 °

Decker, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high52°

Average low29°

Average precipitation0.03 in

Chance of precipitation18%

Record high71° (2020)

Record low4° (1973)

Thu, 0551° / 30°

0.03

51 °

Decker, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high51°

Average low30°

Average precipitation0.03 in

Chance of precipitation27%

Record high72° (1980)

Record low1° (1973)

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 Decker, MT 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 Decker, MT 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.