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As of 12:00 MDT

Weather in Mammoth, MT

55°Current weather

Mammoth, Thursday, 8 October, 12:00

Clear. Feels like 51°. High 67°, low 29°.

Pressure30.06 inHg
Wind3.9 mph W
Humidity28%
Visibility6.2 mi
Dew point23°

Monthly outlook for Mammoth, MT: average high 42.8°, average low 25.5°. That is 8.3° below the climate normal for October. Precipitation is expected on 6 days (about 3.1 inches), against a normal of 4 days and 0.8 inches. The warmest day looks like 9 October (70.8°), the coolest 16 October (10.8°).

42.8°/25.5°
Average high / low
−8.3°
Below normal
6 / 4
Wet days / normal
3.1 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
8 October – 17 October42.7°58.2°-8.6°
18 October – 27 October43°55.4°-6.9°
28 October – 6 Novemberat normal48°—

October records over 66 years

86°3 October 2010All-time high
-11.4°31 October 1996All-time low

Climate normals and records are computed from the nearest reference point — Cardwell (14 mi).

Fri, 0971° / 33°0Mostly clear
71 °Mostly clear

Mammoth, Friday, 9 October

Mostly clear. High 71°, low 33°.

Pressure29.62 inHg
Wind12.5 mph SW
Humidity23%
Visibility6.2 mi
Dew point27°
Sat, 1054° / 34°0.19Snow
54 °Snow

Mammoth, Saturday, 10 October

Snow. High 54°, low 34°.

Pressure29.59 inHg
Wind5.3 mph N
Humidity49%
Visibility6.2 mi
Dew point34°
Sun, 1133° / 30°0.66Snow
33 °Snow

Mammoth, Sunday, 11 October

Snow. High 33°, low 30°.

Pressure30.00 inHg
Wind6.9 mph NE
Humidity94%
Visibility4.4 mi
Dew point29°
Mon, 1234° / 27°0.61Snow
34 °Snow

Mammoth, Monday, 12 October

Snow. High 34°, low 27°.

Pressure30.06 inHg
Wind2.3 mph NE
Humidity96%
Visibility1.7 mi
Dew point29°
Tue, 1340° / 27°0Mostly clear
40 °Mostly clear

Mammoth, Tuesday, 13 October

Mostly clear. High 40°, low 27°.

Pressure30.06 inHg
Wind1.6 mph N
Humidity79%
Visibility—
Dew point30°
Wed, 1441° / 26°0.49Snow
41 °Snow

Mammoth, Wednesday, 14 October

Snow. High 41°, low 26°.

Pressure29.62 inHg
Wind5 mph N
Humidity62%
Visibility—
Dew point28°
Thu, 1525° / 13°0.71Snow
25 °Snow

Mammoth, Thursday, 15 October

Snow. High 25°, low 13°.

Pressure30.45 inHg
Wind7 mph N
Humidity83%
Visibility—
Dew point19°
Fri, 1628° / 11°0Clear
28 °Clear

Mammoth, Friday, 16 October

Clear. High 28°, low 11°.

Pressure30.59 inHg
Wind4.4 mph SW
Humidity88%
Visibility—
Dew point20°
Sat, 1733° / 15°0Clear
33 °Clear

Mammoth, Saturday, 17 October

Clear. High 33°, low 15°.

Pressure30.27 inHg
Wind8.9 mph SW
Humidity83%
Visibility—
Dew point24°
Sun, 1838° / 24°0Clear
38 °Clear

Mammoth, Sunday, 18 October

Clear. High 38°, low 24°.

Pressure30.15 inHg
Wind9.1 mph SW
Humidity77%
Visibility—
Dew point27°
Mon, 1944° / 30°0Clear
44 °Clear

Mammoth, Monday, 19 October

Clear. High 44°, low 30°.

Pressure30.18 inHg
Wind11 mph SW
Humidity59%
Visibility—
Dew point26°
Tue, 2047° / 33°0Partly cloudy
47 °Partly cloudy

Mammoth, Tuesday, 20 October

Partly cloudy. High 47°, low 33°.

Pressure30.27 inHg
Wind9.6 mph SW
Humidity46%
Visibility—
Dew point23°
Wed, 2144° / 31°0Partly cloudy
44 °Partly cloudy

Mammoth, Wednesday, 21 October

Partly cloudy. High 44°, low 31°.

Pressure30.27 inHg
Wind14.9 mph NW
Humidity32%
Visibility—
Dew point15°
Thu, 2247° / 28°0Overcast
47 °Overcast

Mammoth, Thursday, 22 October

Overcast. High 47°, low 28°.

Pressure30.03 inHg
Wind13.3 mph SW
Humidity20%
Visibility—
Dew point3°
Fri, 2338° / 16°0.41Snow
38 °Snow

Mammoth, Friday, 23 October

Snow. High 38°, low 16°.

Pressure29.83 inHg
Wind10.6 mph SW
Humidity93%
Visibility—
Dew point24°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 2454° / 33°0.04Climate normal
54 °Climate normal

Mammoth, Saturday, 24 October

Climate normal for this date — 60-year average.

Average high54°
Average low33°
Average precipitation0.04 in
Chance of precipitation22%
Record high70° (1992)
Record low11° (2020)
Sun, 2554° / 33°0.04Climate normal
54 °Climate normal

Mammoth, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high54°
Average low33°
Average precipitation0.04 in
Chance of precipitation22%
Record high69° (1979)
Record low3° (2020)
Mon, 2653° / 32°0.07Climate normal
53 °Climate normal

Mammoth, Monday, 26 October

Climate normal for this date — 60-year average.

Average high53°
Average low32°
Average precipitation0.07 in
Chance of precipitation35%
Record high69° (1999)
Record low3° (2020)
Tue, 2752° / 31°0.03Climate normal
52 °Climate normal

Mammoth, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high52°
Average low31°
Average precipitation0.03 in
Chance of precipitation20%
Record high68° (1987)
Record low6° (2023)
Wed, 2851° / 31°0.06Climate normal
51 °Climate normal

Mammoth, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high51°
Average low31°
Average precipitation0.06 in
Chance of precipitation33%
Record high69° (1987)
Record low4° (1991)
Thu, 2949° / 29°0.06Climate normal
49 °Climate normal

Mammoth, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high49°
Average low29°
Average precipitation0.06 in
Chance of precipitation27%
Record high70° (1964)
Record low-7° (1991)
Fri, 3048° / 29°0.04Climate normal
48 °Climate normal

Mammoth, Friday, 30 October

Climate normal for this date — 60-year average.

Average high48°
Average low29°
Average precipitation0.04 in
Chance of precipitation28%
Record high68° (1962)
Record low-11° (1991)
Sat, 3148° / 28°0.05Climate normal
48 °Climate normal

Mammoth, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high48°
Average low28°
Average precipitation0.05 in
Chance of precipitation23%
Record high67° (1988)
Record low-11° (1996)
Sun, 0148° / 29°0.04Climate normal
48 °Climate normal

Mammoth, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high48°
Average low29°
Average precipitation0.04 in
Chance of precipitation23%
Record high67° (2025)
Record low-12° (2002)
Mon, 0247° / 29°0.03Climate normal
47 °Climate normal

Mammoth, Monday, 2 November

Climate normal for this date — 60-year average.

Average high47°
Average low29°
Average precipitation0.03 in
Chance of precipitation20%
Record high64° (1965)
Record low-19° (1991)
Tue, 0347° / 28°0.04Climate normal
47 °Climate normal

Mammoth, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high47°
Average low28°
Average precipitation0.04 in
Chance of precipitation18%
Record high65° (1962)
Record low-13° (1991)
Wed, 0448° / 29°0.04Climate normal
48 °Climate normal

Mammoth, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high48°
Average low29°
Average precipitation0.04 in
Chance of precipitation27%
Record high64° (1962)
Record low-11° (1973)
Thu, 0547° / 29°0.04Climate normal
47 °Climate normal

Mammoth, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high47°
Average low29°
Average precipitation0.04 in
Chance of precipitation27%
Record high67° (2020)
Record low-5° (2003)
Fri, 0646° / 28°0.04Climate normal
46 °Climate normal

Mammoth, Friday, 6 November

Climate normal for this date — 60-year average.

Average high46°
Average low28°
Average precipitation0.04 in
Chance of precipitation32%
Record high66° (1999)
Record low6° (2017)

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 Mammoth, 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 Mammoth, 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.