Waterlands
Horsepen Run
USGS · 0164425950
HORSEPEN RUN
USGS · 0164425950LIVE

HORSEPEN RUN AB HORSEPEN RUN TRIB NR HERNDON, VA

RESTON, VA38.9226°N, -77.4058°W
AIR TEMP
73°F
WIND
4mph NNE
FISH INDEX
69SCORE / 100
GREAT · 4 OF 5
Flow Rate Historical Avg
MEDIAN FLOW RATE · 7 DAY
cfs
No flow data available
Precipitation History

Precipitation · YTD

Normal

Near-normal year

2026 to date

22.3in

≈ normal

22.28 in of precipitation so far this year — about average for this point in the season (normal 21.97 in).

YTD Total

22.3in

This year so far

Normal to Date

22.0in

30-yr average

Typical Range

16.4–28.5in

10th–90th pct YTD

Departure

+1%

vs 30-yr normal

By Month

This year
Typical range
Normal
Jan: 3.01" · normal 3.07" (1.7–4.5)
Jan
Feb: 2.50" · normal 2.79" (1.6–4.5)
Feb
Mar: 4.06" · normal 3.83" (1.8–4.9)
Mar
Apr: 2.05" · normal 3.49" (1.6–5.0)
Apr
May: 3.81" · normal 3.85" (2.1–6.5)
May
Jun: 3.40" · normal 3.48" (1.6–5.8)
Jun
Jul: 3.46" (so far)· normal 3.93" (2.0–6.4)
Jul
Aug: normal 3.49" (1.9–4.5)
Aug
Sep: normal 4.50" (1.4–8.4)
Sep
Oct: normal 3.41" (1.0–5.2)
Oct
Nov: normal 3.00" (1.1–5.2)
Nov
Dec: normal 3.49" (2.0–5.4)
Dec
Baseline 19912020 · Source: Open-Meteo07:05 UTC
Your History · HORSEPEN RUN AB HORSEPEN RUN TRIB NR HERNDON, VA

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Weather Conditions
WEATHER CONDITIONS
TODAY
83°
70°
MON
83°
65°
TUE
90°
64°
WED
99°
68°
THU
97°
76°
FRI
91°
71°
SAT
91°
68°
TIME
SUN
8
NOW
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
MON
12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
TUE
12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
WED
12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
THU
12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
FRI
12
am
1
am
2
am
3
am
TEMP
hourly forecast
74°
mild
74°
76°
77°
79°
80°
81°
82°
83°
82°
81°
80°
78°
75°
72°
71°
70°
69°
68°
67°
66°
66°
66°
65°
66°
71°
74°
76°
78°
79°
80°
81°
82°
83°
82°
82°
81°
79°
75°
72°
70°
69°
68°
67°
65°
64°
64°
64°
66°
70°
75°
79°
83°
85°
88°
89°
90°
90°
90°
89°
86°
80°
76°
74°
73°
71°
70°
69°
68°
68°
68°
68°
69°
75°
80°
84°
88°
91°
94°
97°
98°
99°
99°
99°
96°
88°
84°
83°
82°
81°
80°
79°
78°
77°
77°
76°
77°
80°
84°
87°
90°
93°
95°
97°
97°
88°
92°
94°
89°
82°
80°
78°
76°
75°
73°
72°
72°
WIND
mph · gust · dir
8mph NE
G 16 mph
8
G16
NE
8
G14
ENE
7
G13
ENE
7
G12
ENE
8
G12
ESE
7
G10
ESE
6
G9
ESE
7
G9
SE
7
G10
SE
7
G12
SE
7
G15
SSE
6
G16
SE
7
G18
ESE
7
G15
SE
6
G13
SE
5
G13
SE
5
G13
SE
6
G13
SE
5
G11
SSE
4
G7
S
2
G3
SE
3
NE
4
ENE
3
G4
E
2
G4
E
2
G5
ESE
3
G7
SSE
3
G6
SSE
3
G5
SSE
4
G5
SSE
5
G7
S
5
G6
S
4
G6
S
4
G6
S
3
G6
SSE
2
G6
SSE
4
G10
SSE
6
G11
SSE
7
G15
SSE
8
G18
SSE
7
G16
S
6
G12
S
5
G10
SSW
4
G6
SSW
3
W
3
WSW
3
WNW
3
N
1
G2
NW
1
WNW
1
W
2
SSW
4
SSW
4
SSW
3
SSW
4
SW
4
SW
4
SW
4
G5
SW
5
G8
SW
5
G6
SW
5
G7
SW
6
G11
SSW
7
G16
SSW
6
G14
SSW
6
G11
SW
5
G6
SW
4
G5
SW
4
WSW
4
WNW
4
W
4
G5
W
5
G9
W
5
G12
WNW
7
G12
WNW
8
G13
NW
7
G11
WNW
7
G9
WNW
7
G9
WNW
7
G9
WNW
6
G10
W
5
G11
W
5
G11
WNW
4
G10
NNW
4
N
1
G2
NW
3
G4
WSW
5
W
5
G6
W
5
G9
WNW
5
G13
NW
5
G8
WNW
5
G9
WNW
5
G13
WNW
4
G7
WNW
4
G18
WNW
7
G19
NW
9
G18
NW
10
G17
NW
11
G17
NW
10
G17
WNW
10
G17
WNW
11
G18
WNW
11
G17
NW
11
G19
N
11
G19
NW
11
G20
NNW
12
G21
NNW
8
G24
NW
8
G25
NW
7
G25
NNW
7
G24
NNW
6
G19
NW
6
G13
NW
5
G9
NW
5
G7
NW
PRECIP
chance %
1%
1%
3%
4%
5%
6%
8%
11%
10%
13%
10%
8%
11%
7%
4%
3%
2%
1%
1%
0%
0%
0%
1%
1%
0%
0%
0%
0%
0%
0%
0%
1%
2%
2%
2%
2%
2%
2%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
1%
1%
1%
1%
1%
1%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
1%
1%
1%
1%
1%
1%
3%
3%
3%
3%
3%
3%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
2%
2%
2%
2%
2%
2%
9%
9%
9%
9%
9%
9%
9%
CLOUDS
cover %
92%
overcast
92%
98%
100%
100%
96%
100%
100%
100%
100%
100%
100%
100%
100%
97%
94%
88%
24%
29%
100%
100%
100%
99%
100%
41%
0%
0%
3%
4%
2%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
25%
100%
75%
100%
100%
100%
100%
100%
100%
0%
5%
5%
7%
5%
6%
5%
11%
5%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
100%
100%
59%
100%
57%
100%
44%
5%
7%
13%
55%
100%
84%
49%
58%
23%
42%
76%
100%
100%
91%
83%
83%
PRESSURE
hPa · trend
1008
10081009100910101011101010091009101010081005100410041002100010011001100010011003
TemperatureWind / GustsPrecipitationCloud coverPressure
Nowscroll →
FISH INDEX
69
Temperature
Warm
Wind
Calm
Pressure
Rising — Slow
Moon Phase
Average
DAYLIGHT
SUNRISE
05:54 AM
SUNSET
08:35 PM
14H 41M OF DAYLIGHT
MOON PHASE
Waning Crescent
7% illuminated

Station Location

38.9226, -77.4058
Loading map…
DATA · USGS · NOAA · NWS
Site #0164425950·USGS

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