Italian Creek Farms
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Italian Creek Farms clear sky chart from 2005-11-05 to 2017-09-24.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
75%
15397
30%
46940
28%
15361
77%
15361
47%
23795

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 15thNight
68%
716
21%
2488
23%
716
71%
716
33%
1368
January16th to endNight
64%
768
25%
2496
27%
768
66%
768
31%
1471
February1st to 15thNight
64%
699
25%
2184
27%
697
67%
697
33%
1277
February16th to endNight
60%
632
23%
1895
25%
632
62%
632
31%
1166
March1st to 15thNight
62%
720
19%
2115
19%
720
64%
720
34%
1271
March16th to endNight
64%
768
22%
2019
17%
768
68%
768
41%
1194
April1st to 15thNight
63%
719
23%
1799
14%
719
65%
719
40%
1102
April16th to endNight
68%
720
25%
1800
13%
720
71%
720
51%
1007
May1st to 15thNight
74%
626
29%
1706
21%
626
75%
626
60%
829
May16th to endNight
75%
399
31%
1521
34%
398
79%
398
48%
640
June1st to 15thNight
83%
360
30%
1440
38%
360
86%
360
56%
535
June16th to endNight
94%
360
39%
1440
52%
360
95%
360
76%
439
July1st to 15thNight
95%
340
36%
1360
48%
340
95%
340
74%
425
July16th to endNight
89%
471
39%
1503
40%
441
90%
441
63%
601
August1st to 15thNight
92%
651
38%
1725
27%
648
91%
648
77%
758
August16th to endNight
94%
764
44%
1910
29%
764
94%
764
83%
855
September1st to 15thNight
93%
720
43%
1800
32%
720
94%
720
79%
810
September16th to endNight
88%
692
45%
1878
41%
692
90%
692
75%
818
October1st to 15thNight
81%
660
33%
1947
35%
660
82%
660
54%
934
October16th to endNight
82%
704
38%
2115
41%
704
84%
704
58%
969
November1st to 15thNight
78%
700
32%
2275
35%
700
80%
700
49%
1080
November16th to endNight
72%
720
29%
2340
32%
720
74%
720
41%
1209
December1st to 15thNight
66%
720
23%
2496
24%
720
69%
720
31%
1407
December16th to endNight
55%
768
23%
2688
23%
768
59%
768
26%
1630

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
8%312212235%65%
47984
Night
9%312212235%65%
47130
TransparencyDay
22%38%19%25%20%
47664
Night
22%310%20%25%17%
46950
SeeingDay
10%8%29%34%12%4
5878
Night
10%18%33%36%10%
15407

By Month

Percentage Cloud Cover SW (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
16%412222446%52%
1447
16th to endDay
19%5%13333346%46%
1728
February1st to 15thDay
16%5%22313346%49%
1668
16th to endDay
21%6%23313345%43%
1579
March1st to 15thDay
14%7%24325%45%8%40%
1842
16th to endDay
14%5%2342435%6%46%
2205
April1st to 15thDay
14%5%23313346%49%
2149
16th to endDay
10%413323236%58%
2160
May1st to 15thDay
5%312212236%68%
2244
16th to endDay
6%313313446%61%
2590
June1st to 15thDay
3212312235%71%
2520
16th to endDay
111111287%
2520
July1st to 15thDay
111212383%
2520
16th to endDay
21111122380%
2559
August1st to 15thDay
111111286%
2223
16th to endDay
1111123383%
2292
September1st to 15thDay
11111112383%
2160
16th to endDay
2221123479%
1940
October1st to 15thDay
6%212212345%66%
1680
16th to endDay
6%21212335%67%
1755
November1st to 15thDay
9%412323335%60%
1584
16th to endDay
11%32233335%6%55%
1620
December1st to 15thDay
17%5%24423235%49%
1463
16th to endDay
18%6%24423346%42%
1536
January1st to 15thNight
14%312312347%54%
2488
16th to endNight
16%5%14213346%51%
2496
February1st to 15thNight
14%5%13214347%50%
2182
16th to endNight
20%5%12312346%48%
1895
March1st to 15thNight
15%413323336%52%
2115
16th to endNight
13%412213347%55%
2019
April1st to 15thNight
12%412223347%54%
1799
16th to endNight
7%31232233466%
1800
May1st to 15thNight
422112336%71%
1706
16th to endNight
5%21222336%69%
1520
June1st to 15thNight
311122226%74%
1440
16th to endNight
11111288%
1440
July1st to 15thNight
11111285%
1440
16th to endNight
211121212279%
1607
August1st to 15thNight
11111111285%
1734
16th to endNight
1112385%
1910
September1st to 15thNight
111212286%
1800
16th to endNight
2111112382%
1878
October1st to 15thNight
5%212222335%69%
1947
16th to endNight
6%212233472%
2115
November1st to 15thNight
9%311211236%66%
2275
16th to endNight
9%32222335%5%59%
2340
December1st to 15thNight
15%413323347%51%
2496
16th to endNight
21%414312346%46%
2688

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
33%411%21%20%9%
1447
16th to endDay
39%5%11%16%15%11%
1728
February1st to 15thDay
36%5%10%25%16%5%
1668
16th to endDay
41%5%10%25%16%
1579
March1st to 15thDay
39%7%13%17%16%5%
1842
16th to endDay
37%6%15%21%15%2
2205
April1st to 15thDay
35%412%24%19%4
2149
16th to endDay
27%5%10%28%23%3
2160
May1st to 15thDay
18%310%26%32%8%
2244
16th to endDay
22%5%11%29%24%7%
2594
June1st to 15thDay
16%410%19%28%21%
2520
16th to endDay
6%1210%36%41%
2520
July1st to 15thDay
7%127%24%56%
2371
16th to endDay
10%2410%21%50%
2400
August1st to 15thDay
6%1210%27%51%
2207
16th to endDay
7%1310%37%39%
2292
September1st to 15thDay
8%1412%33%39%
2160
16th to endDay
10%15%24%36%22%
1940
October1st to 15thDay
19%38%20%28%19%
1680
16th to endDay
19%28%23%28%16%
1755
November1st to 15thDay
26%313%22%23%9%
1584
16th to endDay
29%412%19%26%6%
1620
December1st to 15thDay
39%5%10%21%19%4
1463
16th to endDay
43%412%18%15%6%
1536
January1st to 15thNight
31%5%11%22%21%7%
2488
16th to endNight
35%412%14%19%13%
2496
February1st to 15thNight
33%411%26%16%7%
2193
16th to endNight
36%5%13%25%15%3
1895
March1st to 15thNight
34%414%18%22%4
2115
16th to endNight
28%5%16%25%18%4
2019
April1st to 15thNight
30%5%16%26%17%3
1799
16th to endNight
21%416%26%26%5%
1800
May1st to 15thNight
14%410%27%32%10%
1707
16th to endNight
17%49%30%30%7%
1521
June1st to 15thNight
12%313%21%27%22%
1440
16th to endNight
5%1211%34%43%
1440
July1st to 15thNight
6%116%27%56%
1360
16th to endNight
12%227%20%54%
1503
August1st to 15thNight
8%1211%26%50%
1725
16th to endNight
6%129%36%43%
1910
September1st to 15thNight
7%1310%32%43%
1800
16th to endNight
9%1419%42%22%
1878
October1st to 15thNight
17%38%25%28%16%
1947
16th to endNight
16%27%25%29%18%
2115
November1st to 15thNight
20%312%25%24%13%
2275
16th to endNight
25%410%23%27%8%
2340
December1st to 15thNight
34%313%22%18%6%
2496
16th to endNight
39%5%11%18%17%7%
2688

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
45%216%22%9%4
75
16th to endDay
23%425%27%16%3
256
February1st to 15thDay
24%7%24%20%18%4
253
16th to endDay
23%10%31%22%11%
238
March1st to 15thDay
17%13%29%22%14%3
270
16th to endDay
18%14%31%23%11%1
288
April1st to 15thDay
20%18%30%23%5%1
269
16th to endDay
13%21%34%22%7%
270
May1st to 15thDay
7%16%37%29%44
288
16th to endDay
9%16%26%34%8%4
330
June1st to 15thDay
5%14%37%30%8%3
315
16th to endDay
16%29%39%13%8%
315
July1st to 15thDay
122%53%11%10%
305
16th to endDay
126%52%9%8%
327
August1st to 15thDay
2334%41%10%6%
315
16th to endDay
1224%48%13%9%
332
September1st to 15thDay
2231%45%13%4
315
16th to endDay
46%31%39%16%1
288
October1st to 15thDay
5%12%32%34%12%2
255
16th to endDay
8%6%30%33%18%1
267
November1st to 15thDay
8%210%21%37%20%
90
16th to endDay
11%10%23%35%17%2
90
December1st to 15thDay
20%138%20%19%
63
16th to endDay
23%15%34%20%6%
64
January1st to 15thNight
15%19%37%24%12%
720
16th to endNight
19%19%34%24%10%
768
February1st to 15thNight
18%19%34%27%8%
704
16th to endNight
20%310%34%24%6%
632
March1st to 15thNight
16%311%32%28%7%
720
16th to endNight
14%115%33%29%4
768
April1st to 15thNight
13%313%37%26%4
719
16th to endNight
9%216%34%28%8%
720
May1st to 15thNight
5%115%39%31%6%
627
16th to endNight
7%111%32%39%6%
399
June1st to 15thNight
318%36%43%6%
360
16th to endNight
1234%56%4
360
July1st to 15thNight
125%66%7%
340
16th to endNight
3117%61%15%
471
August1st to 15thNight
1329%53%11%
651
16th to endNight
225%57%14%
764
September1st to 15thNight
1228%52%15%
720
16th to endNight
35%29%46%14%
692
October1st to 15thNight
5%8%36%35%13%
660
16th to endNight
7%5%32%35%17%
704
November1st to 15thNight
10%6%34%34%13%
700
16th to endNight
10%10%36%29%11%
720
December1st to 15thNight
16%17%41%25%7%
720
16th to endNight
23%113%35%21%4
768
Page generated at 2017-09-25 06:02:24. Version ac04

Copyright 2017 A. Danko


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