Naperville Astronomical Association
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Clear Sky Clocks
Forecast colors key

Cloud Cover:

clear
10% clouds
20% clouds
30% clouds
40% clouds
50% clouds
60% clouds
70% clouds
80% clouds
90% clouds
100% clouds

Transparency:

transparent
above average
average
below average
poor
cloudy

Seeing:

excellent (5/5)
good (4/5)
average (3/5)
poor (2/5)
bad (1/5)
cloudy (n.a.)

Darkness
(limiting magnitude, not counting any manmade light pollution effects):

-4 -3 -2
-1 0 1.0
2.0 3.0 3.5
4.0 4.5 5.0
5.2 5.4 5.6
5.8 6.0

Wind:

calm
light
light-moderate
moderate
strong
storm

Humidity
(ground level R.H.):

<29% 30-35%
35-40% 40-45%
45-50% 50-55%
55-60% 60-65%
65-70% 70-75%
75-80% 80-85%
85-90% 90-95%
95-100%
   

Weather Forecast Tools

The graphics on this page are all linked to their sources; click on them for larger versions, more information, and additional products.

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Cloud modeling forecasts
for our Astronomy Education Center:

Click for interactive version

for our CF dark site area:

Click for interactive version

and for our RR dark site area:

Click for interactive version

The cloud/tran data for downtown Chicago, Ill., same time scale as above clocks:
Click for interactive version
And for Hennepin Canal Parkway State Park, near Princeton, Ill.:
Click for interactive version
And for Green River State Park, near Harmon, Ill.:
Click for interactive version

Click any Clear Sky Clock above for interpretive info and interactive versions.


WEATHER TABLE

Cloud Cover Forecast

NOAA's experimental cloud cover graphical forecast for:
7:00 10:00 1:00 7:00

  US high temps forecast

NOAA's predicted high
temperatures for today
 

      US high temps forecast

NOAA's predicted chance
of precipitation
for next 12 hours

More Forecasting Resources For Astronomers:

 

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