Monthly outlook for Mount Parnassus, CT: average high 58.2°, average low 43.3°. That is 0.1° above the climate normal for October. Precipitation is expected on 2 days (about 0.8 inches), against a normal of 4 days and 2.1 inches. The warmest day looks like 20 October (64.3°), the coolest 24 October (33°).
58.2°/43.3°
Average high / low
+0.1°
Above normal
2 / 4
Wet days / normal
0.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
19 October – 28 October
58°
58.9°
-0.5°
29 October – 7 November
58.5°
56°
+1.3°
8 November – 17 November
at normal
51.8°
—
October records over 66 years
80.6°2 October 2019All-time high
29.1°31 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Old Lyme (12 mi).
Tue, 2064° / 44°0
64 °
Mount Parnassus, Tuesday, 20 October
Clear. High 64°, low 44°.
Pressure30.24 inHg
Wind10.9 mph NE
Humidity49%
Visibility6.2 mi
Dew point42°
Wed, 2155° / 41°0
55 °
Mount Parnassus, Wednesday, 21 October
Partly cloudy. High 55°, low 41°.
Pressure30.24 inHg
Wind11.1 mph NE
Humidity60%
Visibility6.2 mi
Dew point39°
Thu, 2260° / 39°0
60 °
Mount Parnassus, Thursday, 22 October
Clear. High 60°, low 39°.
Pressure30.00 inHg
Wind10.6 mph N
Humidity48%
Visibility6.2 mi
Dew point36°
Fri, 2350° / 38°0
50 °
Mount Parnassus, Friday, 23 October
Clear. High 50°, low 38°.
Pressure30.36 inHg
Wind11.4 mph N
Humidity58%
Visibility—
Dew point30°
Sat, 2455° / 33°0
55 °
Mount Parnassus, Saturday, 24 October
Clear. High 55°, low 33°.
Pressure30.62 inHg
Wind5.1 mph N
Humidity51%
Visibility—
Dew point29°
Sun, 2557° / 38°0
57 °
Mount Parnassus, Sunday, 25 October
Clear. High 57°, low 38°.
Pressure30.45 inHg
Wind8.7 mph SW
Humidity55%
Visibility—
Dew point35°
Mon, 2662° / 46°0
62 °
Mount Parnassus, Monday, 26 October
Clear. High 62°, low 46°.
Pressure30.24 inHg
Wind9.4 mph NW
Humidity58%
Visibility—
Dew point43°
Tue, 2762° / 45°0
62 °
Mount Parnassus, Tuesday, 27 October
Overcast. High 62°, low 45°.
Pressure30.24 inHg
Wind9.4 mph SW
Humidity55%
Visibility—
Dew point40°
Wed, 2856° / 48°0.02
56 °
Mount Parnassus, Wednesday, 28 October
Light rain. High 56°, low 48°.
Pressure30.24 inHg
Wind6.7 mph NE
Humidity90%
Visibility—
Dew point52°
Thu, 2954° / 46°0
54 °
Mount Parnassus, Thursday, 29 October
Overcast. High 54°, low 46°.
Pressure30.39 inHg
Wind6.4 mph E
Humidity65%
Visibility—
Dew point38°
Fri, 3057° / 45°0
57 °
Mount Parnassus, Friday, 30 October
Overcast. High 57°, low 45°.
Pressure30.47 inHg
Wind7.2 mph SE
Humidity58%
Visibility—
Dew point38°
Sat, 3159° / 46°0.15
59 °
Mount Parnassus, Saturday, 31 October
Light rain. High 59°, low 46°.
Pressure30.24 inHg
Wind9.1 mph S
Humidity79%
Visibility—
Dew point51°
Sun, 0164° / 59°0.62
64 °
Mount Parnassus, Sunday, 1 November
Rain. High 64°, low 59°.
Pressure29.88 inHg
Wind17.6 mph SW
Humidity99%
Visibility—
Dew point60°
Mon, 0261° / 46°0
61 °
Mount Parnassus, Monday, 2 November
Overcast. High 61°, low 46°.
Pressure29.80 inHg
Wind15 mph W
Humidity61%
Visibility—
Dew point39°
Tue, 0355° / 41°0
55 °
Mount Parnassus, Tuesday, 3 November
Clear. High 55°, low 41°.
Pressure30.15 inHg
Wind11 mph NW
Humidity43%
Visibility—
Dew point27°
From day 17 onward the outlook is built from 60-year climate statistics
Wed, 0456° / 46°0.04
56 °
Mount Parnassus, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high56°
Average low46°
Average precipitation0.04 in
Chance of precipitation27%
Record high68° (1975)
Record low34° (2013)
Thu, 0556° / 46°0.15
56 °
Mount Parnassus, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high56°
Average low46°
Average precipitation0.15 in
Chance of precipitation40%
Record high70° (2022)
Record low34° (1965)
Fri, 0655° / 45°0.11
55 °
Mount Parnassus, Friday, 6 November
Climate normal for this date — 60-year average.
Average high55°
Average low45°
Average precipitation0.11 in
Chance of precipitation35%
Record high71° (2024)
Record low33° (2012)
Sat, 0755° / 44°0.07
55 °
Mount Parnassus, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high55°
Average low44°
Average precipitation0.07 in
Chance of precipitation25%
Record high72° (2022)
Record low32° (1962)
Sun, 0853° / 43°0.13
53 °
Mount Parnassus, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high53°
Average low43°
Average precipitation0.13 in
Chance of precipitation32%
Record high71° (2020)
Record low30° (2019)
Mon, 0953° / 43°0.09
53 °
Mount Parnassus, Monday, 9 November
Climate normal for this date — 60-year average.
Average high53°
Average low43°
Average precipitation0.09 in
Chance of precipitation22%
Record high67° (1975)
Record low26° (2019)
Tue, 1054° / 43°0.18
54 °
Mount Parnassus, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high54°
Average low43°
Average precipitation0.18 in
Chance of precipitation40%
Record high65° (1999)
Record low27° (2017)
Wed, 1153° / 43°0.16
53 °
Mount Parnassus, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high53°
Average low43°
Average precipitation0.16 in
Chance of precipitation35%
Record high67° (2022)
Record low23° (2017)
Thu, 1252° / 41°0.16
52 °
Mount Parnassus, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high52°
Average low41°
Average precipitation0.16 in
Chance of precipitation38%
Record high71° (2022)
Record low28° (2019)
Fri, 1351° / 40°0.21
51 °
Mount Parnassus, Friday, 13 November
Climate normal for this date — 60-year average.
Average high51°
Average low40°
Average precipitation0.21 in
Chance of precipitation40%
Record high65° (1964)
Record low22° (2019)
Sat, 1450° / 40°0.09
50 °
Mount Parnassus, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high50°
Average low40°
Average precipitation0.09 in
Chance of precipitation22%
Record high62° (1989)
Record low25° (1986)
Sun, 1551° / 40°0.13
51 °
Mount Parnassus, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high51°
Average low40°
Average precipitation0.13 in
Chance of precipitation42%
Record high67° (1993)
Record low24° (1967)
Mon, 1651° / 40°0.15
51 °
Mount Parnassus, Monday, 16 November
Climate normal for this date — 60-year average.
Average high51°
Average low40°
Average precipitation0.15 in
Chance of precipitation35%
Record high64° (2001)
Record low23° (1967)
Tue, 1750° / 40°0.15
50 °
Mount Parnassus, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high50°
Average low40°
Average precipitation0.15 in
Chance of precipitation28%
Record high65° (2024)
Record low26° (2019)
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 Parnassus, CT 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 Parnassus, CT 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.