Monthly outlook for Herndon, WV: average high 49.5°, average low 31.4°. That is 1.6° below the climate normal for November. Precipitation is expected on 5 days (about 0.9 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 18 November (61.3°), the coolest 24 November (20.3°).
49.5°/31.4°
Average high / low
−1.6°
Below normal
5 / 6
Wet days / normal
0.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
15 November – 24 November
52.4°
53°
-0.3°
25 November – 4 December
44.7°
50.4°
-3.1°
5 December – 14 December
at normal
46.6°
—
November records over 66 years
78.1°2 November 2004All-time high
10.8°26 November 1971All-time low
Climate normals and records are computed from the nearest reference point — Rhodell (7 mi).
Mon, 1648° / 32°0
48 °
Herndon, Monday, 16 November
Overcast. High 48°, low 32°.
Pressure30.56 inHg
Wind3.5 mph N
Humidity60%
Visibility6.2 mi
Dew point32°
Tue, 1758° / 27°0
58 °
Herndon, Tuesday, 17 November
Clear. High 58°, low 27°.
Pressure30.53 inHg
Wind1.2 mph NW
Humidity38%
Visibility6.2 mi
Dew point28°
Wed, 1861° / 32°0
61 °
Herndon, Wednesday, 18 November
Clear. High 61°, low 32°.
Pressure30.47 inHg
Wind0.8 mph W
Humidity34%
Visibility6.2 mi
Dew point26°
Thu, 1961° / 32°0
61 °
Herndon, Thursday, 19 November
Overcast. High 61°, low 32°.
Pressure30.39 inHg
Wind5.8 mph SE
Humidity31%
Visibility—
Dew point27°
Fri, 2059° / 38°0
59 °
Herndon, Friday, 20 November
Mostly clear. High 59°, low 38°.
Pressure30.30 inHg
Wind3.4 mph NW
Humidity46%
Visibility—
Dew point36°
Sat, 2161° / 39°0
61 °
Herndon, Saturday, 21 November
Mostly clear. High 61°, low 39°.
Pressure30.21 inHg
Wind5.9 mph SE
Humidity40%
Visibility—
Dew point34°
Sun, 2260° / 38°0.01
60 °
Herndon, Sunday, 22 November
Light rain. High 60°, low 38°.
Pressure29.94 inHg
Wind14.5 mph W
Humidity46%
Visibility—
Dew point37°
Mon, 2340° / 25°0.06
40 °
Herndon, Monday, 23 November
Snow. High 40°, low 25°.
Pressure30.12 inHg
Wind14.8 mph W
Humidity79%
Visibility—
Dew point26°
Tue, 2433° / 20°0
33 °
Herndon, Tuesday, 24 November
Overcast. High 33°, low 20°.
Pressure30.45 inHg
Wind8.1 mph N
Humidity46%
Visibility—
Dew point13°
Wed, 2544° / 20°0
44 °
Herndon, Wednesday, 25 November
Overcast. High 44°, low 20°.
Pressure30.45 inHg
Wind5.5 mph SE
Humidity29%
Visibility—
Dew point11°
Thu, 2647° / 26°0
47 °
Herndon, Thursday, 26 November
Partly cloudy. High 47°, low 26°.
Pressure30.36 inHg
Wind8.9 mph SE
Humidity25%
Visibility—
Dew point10°
Fri, 2756° / 36°0.5
56 °
Herndon, Friday, 27 November
Rain. High 56°, low 36°.
Pressure29.88 inHg
Wind23.2 mph SE
Humidity87%
Visibility—
Dew point44°
Sat, 2851° / 40°0.11
51 °
Herndon, Saturday, 28 November
Light rain. High 51°, low 40°.
Pressure29.80 inHg
Wind16.6 mph SW
Humidity68%
Visibility—
Dew point34°
Sun, 2937° / 32°0.11
37 °
Herndon, Sunday, 29 November
Snow. High 37°, low 32°.
Pressure30.03 inHg
Wind13.3 mph W
Humidity86%
Visibility—
Dew point32°
Mon, 3033° / 30°0.07
33 °
Herndon, Monday, 30 November
Light snow. High 33°, low 30°.
Pressure30.30 inHg
Wind12 mph W
Humidity84%
Visibility—
Dew point29°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 0149° / 34°0.19
49 °
Herndon, Tuesday, 1 December
Climate normal for this date — 60-year average.
Average high49°
Average low34°
Average precipitation0.19 in
Chance of precipitation45%
Record high67° (2006)
Record low14° (1964)
Wed, 0249° / 34°0.11
49 °
Herndon, Wednesday, 2 December
Climate normal for this date — 60-year average.
Average high49°
Average low34°
Average precipitation0.11 in
Chance of precipitation37%
Record high72° (1982)
Record low17° (1966)
Thu, 0349° / 33°0.11
49 °
Herndon, Thursday, 3 December
Climate normal for this date — 60-year average.
Average high49°
Average low33°
Average precipitation0.11 in
Chance of precipitation37%
Record high70° (1982)
Record low2° (1966)
Fri, 0448° / 33°0.16
48 °
Herndon, Friday, 4 December
Climate normal for this date — 60-year average.
Average high48°
Average low33°
Average precipitation0.16 in
Chance of precipitation40%
Record high72° (1982)
Record low2° (1966)
Sat, 0548° / 33°0.13
48 °
Herndon, Saturday, 5 December
Climate normal for this date — 60-year average.
Average high48°
Average low33°
Average precipitation0.13 in
Chance of precipitation50%
Record high73° (2001)
Record low6° (1974)
Sun, 0647° / 31°0.13
47 °
Herndon, Sunday, 6 December
Climate normal for this date — 60-year average.
Average high47°
Average low31°
Average precipitation0.13 in
Chance of precipitation42%
Record high69° (1998)
Record low11° (1974)
Mon, 0745° / 31°0.13
45 °
Herndon, Monday, 7 December
Climate normal for this date — 60-year average.
Average high45°
Average low31°
Average precipitation0.13 in
Chance of precipitation38%
Record high68° (1998)
Record low3° (1977)
Tue, 0846° / 32°0.11
46 °
Herndon, Tuesday, 8 December
Climate normal for this date — 60-year average.
Average high46°
Average low32°
Average precipitation0.11 in
Chance of precipitation37%
Record high73° (1978)
Record low3° (1977)
Wed, 0948° / 32°0.19
48 °
Herndon, Wednesday, 9 December
Climate normal for this date — 60-year average.
Average high48°
Average low32°
Average precipitation0.19 in
Chance of precipitation52%
Record high70° (1966)
Record low10° (2010)
Thu, 1047° / 32°0.2
47 °
Herndon, Thursday, 10 December
Climate normal for this date — 60-year average.
Average high47°
Average low32°
Average precipitation0.2 in
Chance of precipitation55%
Record high70° (1971)
Record low4° (1995)
Fri, 1146° / 31°0.13
46 °
Herndon, Friday, 11 December
Climate normal for this date — 60-year average.
Average high46°
Average low31°
Average precipitation0.13 in
Chance of precipitation47%
Record high70° (2007)
Record low4° (2018)
Sat, 1246° / 31°0.1
46 °
Herndon, Saturday, 12 December
Climate normal for this date — 60-year average.
Average high46°
Average low31°
Average precipitation0.1 in
Chance of precipitation38%
Record high68° (2015)
Record low-5° (1988)
Sun, 1347° / 32°0.12
47 °
Herndon, Sunday, 13 December
Climate normal for this date — 60-year average.
Average high47°
Average low32°
Average precipitation0.12 in
Chance of precipitation42%
Record high67° (2015)
Record low-17° (1962)
Mon, 1446° / 31°0.13
46 °
Herndon, Monday, 14 December
Climate normal for this date — 60-year average.
Average high46°
Average low31°
Average precipitation0.13 in
Chance of precipitation33%
Record high68° (1984)
Record low4° (2025)
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 Herndon, WV 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 Herndon, WV 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.