Monthly outlook for Calais, MT: average high 53.9°, average low 39.5°. That is 1.1° below the climate normal for October. Precipitation is expected on 2 days (about 0.8 inches), against a normal of 3 days and 0.5 inches. The warmest day looks like 10 October (64.5°), the coolest 17 October (29.8°).
53.9°/39.5°
Average high / low
−1.1°
Below normal
2 / 3
Wet days / normal
0.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
10 October – 19 October
53.2°
56.9°
-2.1°
20 October – 29 October
55.1°
52.7°
+1.3°
30 October – 8 November
at normal
46°
—
October records over 66 years
90.3°1 October 1992All-time high
-4.4°31 October 2023All-time low
Climate normals and records are computed from the nearest reference point — Culbertson (14 mi).
Sun, 1146° / 39°0.35
46 °
Calais, Sunday, 11 October
Rain. High 46°, low 39°.
Pressure30.09 inHg
Wind12.5 mph NE
Humidity88%
Visibility5.7 mi
Dew point39°
Mon, 1239° / 35°0.43
39 °
Calais, Monday, 12 October
Snow. High 39°, low 35°.
Pressure30.12 inHg
Wind9.4 mph NE
Humidity99%
Visibility0.7 mi
Dew point35°
Tue, 1351° / 38°0
51 °
Calais, Tuesday, 13 October
Overcast. High 51°, low 38°.
Pressure30.15 inHg
Wind6.4 mph SW
Humidity61%
Visibility6.2 mi
Dew point33°
Wed, 1456° / 31°0
56 °
Calais, Wednesday, 14 October
Clear. High 56°, low 31°.
Pressure30.30 inHg
Wind5.1 mph SE
Humidity57%
Visibility—
Dew point33°
Thu, 1557° / 39°0.01
57 °
Calais, Thursday, 15 October
Snow. High 57°, low 39°.
Pressure30.21 inHg
Wind25.1 mph NW
Humidity51%
Visibility—
Dew point37°
Fri, 1638° / 33°0
38 °
Calais, Friday, 16 October
Overcast. High 38°, low 33°.
Pressure30.59 inHg
Wind27.4 mph NW
Humidity53%
Visibility—
Dew point21°
Sat, 1757° / 30°0
57 °
Calais, Saturday, 17 October
Overcast. High 57°, low 30°.
Pressure30.12 inHg
Wind19 mph S
Humidity27%
Visibility—
Dew point13°
Sun, 1860° / 41°0
60 °
Calais, Sunday, 18 October
Mostly clear. High 60°, low 41°.
Pressure30.03 inHg
Wind7.4 mph SE
Humidity26%
Visibility—
Dew point20°
Mon, 1962° / 43°0
62 °
Calais, Monday, 19 October
Overcast. High 62°, low 43°.
Pressure29.83 inHg
Wind19.3 mph SE
Humidity38%
Visibility—
Dew point28°
Tue, 2058° / 45°0
58 °
Calais, Tuesday, 20 October
Partly cloudy. High 58°, low 45°.
Pressure29.71 inHg
Wind11.8 mph W
Humidity46%
Visibility—
Dew point33°
Wed, 2155° / 45°0
55 °
Calais, Wednesday, 21 October
Overcast. High 55°, low 45°.
Pressure30.00 inHg
Wind8.9 mph W
Humidity43%
Visibility—
Dew point30°
Thu, 2259° / 44°0
59 °
Calais, Thursday, 22 October
Overcast. High 59°, low 44°.
Pressure29.80 inHg
Wind16 mph W
Humidity36%
Visibility—
Dew point28°
Fri, 2351° / 42°0
51 °
Calais, Friday, 23 October
Overcast. High 51°, low 42°.
Pressure30.15 inHg
Wind17 mph NW
Humidity48%
Visibility—
Dew point27°
Sat, 2454° / 38°0
54 °
Calais, Saturday, 24 October
Overcast. High 54°, low 38°.
Pressure30.09 inHg
Wind16.2 mph W
Humidity35%
Visibility—
Dew point22°
Sun, 2554° / 45°0
54 °
Calais, Sunday, 25 October
Mostly clear. High 54°, low 45°.
Pressure30.18 inHg
Wind17.5 mph NW
Humidity41%
Visibility—
Dew point30°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2653° / 35°0.03
53 °
Calais, Monday, 26 October
Climate normal for this date — 60-year average.
Average high53°
Average low35°
Average precipitation0.03 in
Chance of precipitation20%
Record high73° (1983)
Record low4° (2020)
Tue, 2751° / 33°0.04
51 °
Calais, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high51°
Average low33°
Average precipitation0.04 in
Chance of precipitation20%
Record high73° (1983)
Record low7° (2023)
Wed, 2850° / 33°0.03
50 °
Calais, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high50°
Average low33°
Average precipitation0.03 in
Chance of precipitation15%
Record high74° (1990)
Record low11° (2023)
Thu, 2948° / 32°0.05
48 °
Calais, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high48°
Average low32°
Average precipitation0.05 in
Chance of precipitation22%
Record high72° (1968)
Record low10° (1991)
Fri, 3048° / 31°0.03
48 °
Calais, Friday, 30 October
Climate normal for this date — 60-year average.
Average high48°
Average low31°
Average precipitation0.03 in
Chance of precipitation15%
Record high70° (1983)
Record low-2° (1991)
Sat, 3148° / 31°0.02
48 °
Calais, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high48°
Average low31°
Average precipitation0.02 in
Chance of precipitation17%
Record high76° (1990)
Record low-4° (2023)
Sun, 0147° / 32°0.04
47 °
Calais, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high47°
Average low32°
Average precipitation0.04 in
Chance of precipitation15%
Record high69° (1965)
Record low2° (1984)
Mon, 0246° / 30°0.02
46 °
Calais, Monday, 2 November
Climate normal for this date — 60-year average.
Average high46°
Average low30°
Average precipitation0.02 in
Chance of precipitation13%
Record high71° (1965)
Record low3° (1991)
Tue, 0346° / 30°0.02
46 °
Calais, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high46°
Average low30°
Average precipitation0.02 in
Chance of precipitation15%
Record high66° (1981)
Record low-4° (1991)
Wed, 0447° / 30°0.03
47 °
Calais, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high47°
Average low30°
Average precipitation0.03 in
Chance of precipitation23%
Record high69° (1975)
Record low8° (1991)
Thu, 0546° / 29°0.02
46 °
Calais, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high46°
Average low29°
Average precipitation0.02 in
Chance of precipitation13%
Record high71° (2020)
Record low-1° (2003)
Fri, 0645° / 28°0.02
45 °
Calais, Friday, 6 November
Climate normal for this date — 60-year average.
Average high45°
Average low28°
Average precipitation0.02 in
Chance of precipitation17%
Record high66° (2009)
Record low0° (1991)
Sat, 0745° / 28°0.02
45 °
Calais, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high45°
Average low28°
Average precipitation0.02 in
Chance of precipitation10%
Record high73° (1999)
Record low-3° (1991)
Sun, 0843° / 27°0.03
43 °
Calais, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high43°
Average low27°
Average precipitation0.03 in
Chance of precipitation20%
Record high70° (1999)
Record low-2° (2000)
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 Calais, 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 Calais, 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.