Monthly outlook for Mount Vernon, MO: average high 66.9°, average low 48°. That is 0.8° above the climate normal for October. Precipitation is expected on 3 days (about 1.4 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 22 October (77.8°), the coolest 28 October (40.3°).
66.9°/48°
Average high / low
+0.8°
Above normal
3 / 5
Wet days / normal
1.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
15 October – 24 October
69.6°
66.7°
+1.6°
25 October – 3 November
62.4°
62.3°
+0.1°
4 November – 13 November
at normal
58.2°
—
October records over 66 years
89.6°3 October 2006All-time high
25.2°31 October 1993All-time low
Climate normals and records are computed from the nearest reference point — Miller (8 mi).
Fri, 1656° / 47°0
56 °
Mount Vernon, Friday, 16 October
Overcast. High 56°, low 47°.
Pressure30.42 inHg
Wind22.1 mph N
Humidity57%
Visibility6.2 mi
Dew point38°
Sat, 1756° / 41°0
56 °
Mount Vernon, Saturday, 17 October
Clear. High 56°, low 41°.
Pressure30.59 inHg
Wind5.3 mph NE
Humidity64%
Visibility6.2 mi
Dew point40°
Sun, 1862° / 44°0
62 °
Mount Vernon, Sunday, 18 October
Clear. High 62°, low 44°.
Pressure30.45 inHg
Wind8.6 mph S
Humidity57%
Visibility6.2 mi
Dew point43°
Mon, 1966° / 46°0
66 °
Mount Vernon, Monday, 19 October
Clear. High 66°, low 46°.
Pressure30.33 inHg
Wind8.5 mph S
Humidity47%
Visibility—
Dew point42°
Tue, 2070° / 50°0
70 °
Mount Vernon, Tuesday, 20 October
Mostly clear. High 70°, low 50°.
Pressure30.27 inHg
Wind8.9 mph SE
Humidity48%
Visibility—
Dew point46°
Wed, 2176° / 55°0
76 °
Mount Vernon, Wednesday, 21 October
Clear. High 76°, low 55°.
Pressure30.24 inHg
Wind12.4 mph SE
Humidity42%
Visibility—
Dew point47°
Thu, 2278° / 55°0
78 °
Mount Vernon, Thursday, 22 October
Partly cloudy. High 78°, low 55°.
Pressure30.15 inHg
Wind14.3 mph SE
Humidity36%
Visibility—
Dew point44°
Fri, 2376° / 58°0.14
76 °
Mount Vernon, Friday, 23 October
Rain. High 76°, low 58°.
Pressure29.97 inHg
Wind23.7 mph S
Humidity33%
Visibility—
Dew point42°
Sat, 2478° / 56°0.24
78 °
Mount Vernon, Saturday, 24 October
Rain. High 78°, low 56°.
Pressure30.03 inHg
Wind13.2 mph S
Humidity51%
Visibility—
Dew point54°
Sun, 2558° / 44°0
58 °
Mount Vernon, Sunday, 25 October
Clear. High 58°, low 44°.
Pressure30.36 inHg
Wind16.7 mph NW
Humidity28%
Visibility—
Dew point24°
Mon, 2664° / 41°0
64 °
Mount Vernon, Monday, 26 October
Clear. High 64°, low 41°.
Pressure30.36 inHg
Wind7.1 mph SW
Humidity26%
Visibility—
Dew point24°
Tue, 2759° / 43°0
59 °
Mount Vernon, Tuesday, 27 October
Clear. High 59°, low 43°.
Pressure30.27 inHg
Wind13.7 mph W
Humidity42%
Visibility—
Dew point34°
Wed, 2867° / 40°0
67 °
Mount Vernon, Wednesday, 28 October
Clear. High 67°, low 40°.
Pressure30.18 inHg
Wind10.6 mph SW
Humidity31%
Visibility—
Dew point30°
Thu, 2971° / 47°0
71 °
Mount Vernon, Thursday, 29 October
Clear. High 71°, low 47°.
Pressure30.06 inHg
Wind14.4 mph SW
Humidity32%
Visibility—
Dew point36°
Fri, 3056° / 44°0
56 °
Mount Vernon, Friday, 30 October
Clear. High 56°, low 44°.
Pressure30.45 inHg
Wind18.3 mph NE
Humidity45%
Visibility—
Dew point33°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 3163° / 47°0.21
63 °
Mount Vernon, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high63°
Average low47°
Average precipitation0.21 in
Chance of precipitation37%
Record high79° (2016)
Record low25° (1993)
Sun, 0162° / 46°0.2
62 °
Mount Vernon, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high62°
Average low46°
Average precipitation0.2 in
Chance of precipitation37%
Record high79° (2016)
Record low23° (2023)
Mon, 0260° / 45°0.11
60 °
Mount Vernon, Monday, 2 November
Climate normal for this date — 60-year average.
Average high60°
Average low45°
Average precipitation0.11 in
Chance of precipitation28%
Record high78° (2016)
Record low24° (1991)
Tue, 0360° / 45°0.11
60 °
Mount Vernon, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high60°
Average low45°
Average precipitation0.11 in
Chance of precipitation27%
Record high78° (1978)
Record low16° (1991)
Wed, 0460° / 44°0.19
60 °
Mount Vernon, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high60°
Average low44°
Average precipitation0.19 in
Chance of precipitation35%
Record high78° (1978)
Record low17° (1991)
Thu, 0559° / 44°0.11
59 °
Mount Vernon, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high59°
Average low44°
Average precipitation0.11 in
Chance of precipitation33%
Record high77° (2017)
Record low25° (1976)
Fri, 0659° / 42°0.1
59 °
Mount Vernon, Friday, 6 November
Climate normal for this date — 60-year average.
Average high59°
Average low42°
Average precipitation0.1 in
Chance of precipitation23%
Record high76° (1999)
Record low26° (1993)
Sat, 0759° / 43°0.06
59 °
Mount Vernon, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high59°
Average low43°
Average precipitation0.06 in
Chance of precipitation18%
Record high78° (2023)
Record low24° (1991)
Sun, 0860° / 44°0.09
60 °
Mount Vernon, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high60°
Average low44°
Average precipitation0.09 in
Chance of precipitation17%
Record high79° (1980)
Record low17° (1991)
Mon, 0960° / 44°0.09
60 °
Mount Vernon, Monday, 9 November
Climate normal for this date — 60-year average.
Average high60°
Average low44°
Average precipitation0.09 in
Chance of precipitation28%
Record high78° (2006)
Record low23° (1991)
Tue, 1058° / 42°0.1
58 °
Mount Vernon, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high58°
Average low42°
Average precipitation0.1 in
Chance of precipitation32%
Record high75° (2022)
Record low17° (2018)
Wed, 1157° / 40°0.1
57 °
Mount Vernon, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high57°
Average low40°
Average precipitation0.1 in
Chance of precipitation27%
Record high75° (1989)
Record low21° (2019)
Thu, 1255° / 39°0.08
55 °
Mount Vernon, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high55°
Average low39°
Average precipitation0.08 in
Chance of precipitation25%
Record high77° (1999)
Record low11° (2019)
Fri, 1356° / 39°0.06
56 °
Mount Vernon, Friday, 13 November
Climate normal for this date — 60-year average.
Average high56°
Average low39°
Average precipitation0.06 in
Chance of precipitation22%
Record high78° (1999)
Record low11° (1986)
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 Mount Vernon, MO 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 Mount Vernon, MO 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.