MEDIAN FLOW RATE · 1 YEAR
8,305cfs 27.2% vs avg
Optimal band: 4,404–5,958 cfs
PERIOD HIGH
31,466cfs
PERIOD LOW
2,224cfs
RUNNABLE
22%
last 1 year in band
Precipitation History
Precipitation · YTD
WetWetter than normal
2026 to date
24.0in
+17% vs normal
24.01 in of precipitation so far this year, 17% above the 30-year normal of 20.49 in for this point in the season.
YTD Total
24.0in
This year so far
Normal to Date
20.5in
30-yr average
Typical Range
15.1–25.3in
10th–90th pct YTD
Departure
+17%
vs 30-yr normal
By Month
This year
Typical range
Normal
Jan: 0.88" · normal 1.93" (0.9–3.0)
Feb: 0.21" · normal 1.92" (0.7–3.5)
Mar: 4.63" · normal 2.58" (1.4–3.9)
Apr: 7.83" · normal 4.26" (2.7–5.8)
May: 1.39" · normal 4.72" (1.7–7.7)
Jun: 8.32" · normal 4.37" (2.0–7.0)
Jul: 0.76" (so far)· normal 3.59" (1.3–5.7)
Aug: normal 3.42" (1.4–5.4)
Sep: normal 3.29" (1.5–5.8)
Oct: normal 2.88" (1.1–4.8)
Nov: normal 2.54" (0.9–4.4)
Dec: normal 2.21" (1.0–4.3)
Baseline 1991–2020 · Source: Open-Meteo01:06 AM
Your History · ROCK RIVER AT COMO, IL
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Weather Conditions
WEATHER CONDITIONS
TODAY
83°
67°
MON
84°
66°
TUE
82°
63°
WED
84°
67°
THU
83°
70°
FRI
82°
69°
SAT
82°
66°
FISH INDEX
Temperature
Warm
Wind
Light
Pressure
Rising — Slow
Moon Phase
Good
DAYLIGHT
SUNRISE
05:30 AM
SUNSET
08:36 PM
15H 6M OF DAYLIGHT
MOON PHASE
Last Quarter
64% illuminated
Station Location
41.7722, -89.7456Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-07-06 00:00 UTC
Site #05443500·USGS
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