MEDIAN FLOW RATE · 30 DAY
1cfs 50.3% vs avg
Optimal band: 1–1 cfs
PERIOD HIGH
7cfs
PERIOD LOW
1cfs
RUNNABLE
65%
last 30 day in band
Precipitation History
Precipitation · YTD
NormalNear-normal year
2026 to date
18.2in
≈ normal
18.24 in of precipitation so far this year — about average for this point in the season (normal 20.39 in).
YTD Total
18.2in
This year so far
Normal to Date
20.4in
30-yr average
Typical Range
15.4–26.2in
10th–90th pct YTD
Departure
-10%
vs 30-yr normal
By Month
This year
Typical range
Normal
Jan: 3.01" · normal 3.07" (1.7–4.5)
Feb: 2.50" · normal 2.79" (1.6–4.5)
Mar: 4.06" · normal 3.83" (1.8–4.9)
Apr: 2.05" · normal 3.49" (1.6–5.0)
May: 3.81" · normal 3.85" (2.1–6.5)
Jun: 2.83" (so far)· normal 3.48" (1.6–5.8)
Jul: normal 3.93" (2.0–6.4)
Aug: normal 3.49" (1.9–4.5)
Sep: normal 4.50" (1.4–8.4)
Oct: normal 3.41" (1.0–5.2)
Nov: normal 3.00" (1.1–5.2)
Dec: normal 3.49" (2.0–5.4)
Baseline 1991–2020 · Source: Open-Meteo07:35 AM
Your History · FLATLICK BRANCH ABOVE FROG BRANCH AT CHANTILLY, VA
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Weather Conditions
WEATHER CONDITIONS
TODAY
77°
71°
MON
83°
68°
TUE
95°
69°
WED
101°
72°
THU
103°
78°
FRI
104°
78°
SAT
103°
79°
FISH INDEX
Temperature
Warm
Wind
Light
Pressure
Rising — Slow
Moon Phase
Peak Activity
DAYLIGHT
SUNRISE
05:47 AM
SUNSET
08:39 PM
14H 52M OF DAYLIGHT11H 43M REMAINING
MOON PHASE
Full Moon
97% illuminated
PEAK ACTIVITY
Station Location
38.8824, -77.4319Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-06-28 08:56 UTC
Site #01656903·USGS
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