MEDIAN FLOW RATE · 1 YEAR
159cfs 10.3% vs avg
Optimal band: 3–5 cfs
PERIOD HIGH
334cfs
PERIOD LOW
1cfs
RUNNABLE
36%
last 1 year in band
Precipitation History
Precipitation · YTD
NormalNear-normal year
2026 to date
21.6in
≈ normal
21.61 in of precipitation so far this year — about average for this point in the season (normal 20.15 in).
YTD Total
21.6in
This year so far
Normal to Date
20.1in
30-yr average
Typical Range
13.8–24.9in
10th–90th pct YTD
Departure
+7%
vs 30-yr normal
By Month
This year
Typical range
Normal
Jan: 1.58" · normal 2.36" (0.9–3.9)
Feb: 0.62" · normal 2.09" (0.7–3.4)
Mar: 3.75" · normal 2.91" (1.5–4.9)
Apr: 5.97" · normal 4.27" (2.7–6.7)
May: 1.02" · normal 4.73" (2.3–6.9)
Jun: 8.67" (so far)· normal 4.43" (2.1–7.8)
Jul: normal 4.15" (2.1–6.6)
Aug: normal 3.88" (2.2–5.2)
Sep: normal 3.18" (1.1–5.4)
Oct: normal 3.32" (1.6–6.2)
Nov: normal 2.76" (1.5–4.4)
Dec: normal 2.20" (1.2–3.5)
Baseline 1991–2020 · Source: Open-Meteo01:21 PM
Your History · CALUMET UNION DRAINAGE CANAL NEAR MARKHAM, IL
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Weather Conditions
WEATHER CONDITIONS
TODAY
80°
60°
FRI
68°
60°
SAT
78°
58°
SUN
86°
64°
MON
94°
73°
TUE
97°
77°
WED
98°
78°
FISH INDEX
Temperature
Warm
Wind
Light
Pressure
Rising — Slow
Moon Phase
Average
DAYLIGHT
SUNRISE
05:17 AM
SUNSET
08:28 PM
15H 11M OF DAYLIGHT7H 7M REMAINING
MOON PHASE
Waxing Gibbous
79% illuminated
Station Location
41.5970, -87.6657Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-06-25 13:21 UTC
Site #05536310·USGS
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