John Paul II Catholic High School
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the John Paul II Catholic High School clear sky chart from 2005-11-05 to 2018-10-27.

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
51%
16808
25%
51348
18%
16765
58%
16765
33%
30058

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
42%
971
26%
2522
13%
970
49%
970
32%
1603
January16th to endNight
39%
942
28%
2606
14%
942
48%
942
31%
1621
February1st to 15thNight
36%
764
27%
2288
13%
759
47%
759
29%
1373
February16th to endNight
26%
684
26%
2050
9%
684
40%
684
27%
1238
March1st to 15thNight
32%
605
27%
2165
14%
605
47%
605
25%
1275
March16th to endNight
32%
624
22%
2288
15%
624
42%
624
24%
1326
April1st to 15thNight
30%
584
22%
2142
13%
584
44%
584
25%
1228
April16th to endNight
32%
579
24%
1904
15%
579
47%
579
25%
1186
May1st to 15thNight
36%
584
23%
1755
17%
584
45%
584
29%
1086
May16th to endNight
48%
610
25%
1828
19%
609
59%
609
35%
1056
June1st to 15thNight
67%
585
24%
1755
22%
585
74%
585
49%
879
June16th to endNight
68%
585
20%
1755
21%
585
72%
585
35%
1029
July1st to 15thNight
76%
555
19%
1665
21%
555
80%
555
42%
924
July16th to endNight
80%
612
24%
1738
26%
579
84%
579
44%
928
August1st to 15thNight
88%
575
27%
1800
32%
572
89%
572
52%
859
August16th to endNight
79%
621
19%
2140
23%
621
81%
621
34%
1193
September1st to 15thNight
73%
585
19%
2145
23%
585
74%
585
29%
1247
September16th to endNight
64%
582
22%
2145
24%
582
65%
582
26%
1266
October1st to 15thNight
70%
585
32%
2145
33%
585
73%
585
38%
1100
October16th to endNight
60%
816
34%
2448
25%
816
65%
816
43%
1297
November1st to 15thNight
54%
770
26%
2290
17%
770
59%
770
33%
1367
November16th to endNight
51%
975
31%
2535
16%
975
58%
975
41%
1491
December1st to 15thNight
43%
975
28%
2535
16%
975
47%
975
30%
1664
December16th to endNight
38%
1040
23%
2704
12%
1040
43%
1040
27%
1822

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
13%5%25%5%3445%7%43%
52199
Night
12%423323347%50%
51548
Cloud CoverDay
14%5%2443445%7%43%
52197
Night
13%413323347%50%
51548
TransparencyDay
39%5%10%18%17%8%
51897
Night
33%5%11%20%17%11%
51353
SeeingDay
14%417%30%26%7%
6766
Night
15%422%36%19%1
16814

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
17%5%34422335%46%
1746
16th to endDay
16%6%23223436%48%
1981
February1st to 15thDay
18%6%2432333448%
1900
16th to endDay
20%6%13313345%43%
1710
March1st to 15thDay
21%6%2432343443%
2125
16th to endDay
18%7%24313335%46%
2288
April1st to 15thDay
14%5%26%424346%44%
2136
16th to endDay
16%7%35%423345%42%
2326
May1st to 15thDay
14%6%45%6%35%45%6%37%
2526
16th to endDay
14%6%35%5%3446%7%36%
2638
June1st to 15thDay
5%425%5%36%5%6%9%44%
2535
16th to endDay
10%7%36%6%5%6%6%6%9%31%
2535
July1st to 15thDay
8%426%7%46%5%5%9%38%
2535
16th to endDay
6%4245%46%7%6%11%41%
2674
August1st to 15thDay
2212425%5%6%11%53%
2399
16th to endDay
7%425%7%46%5%7%8%39%
2413
September1st to 15thDay
11%6%36%6%36%6%6%6%36%
2145
16th to endDay
11%6%25%5%45%46%6%40%
2145
October1st to 15thDay
9%424435%5%46%48%
2132
16th to endDay
11%323212345%59%
2033
November1st to 15thDay
14%7%345%2445%6%40%
1895
16th to endDay
14%5%2442233453%
1755
December1st to 15thDay
21%6%23423335%41%
1755
16th to endDay
18%7%25%5%23445%40%
1872
January1st to 15thNight
18%5%14322335%49%
2522
16th to endNight
18%424313435%49%
2606
February1st to 15thNight
18%5%23213335%50%
2282
16th to endNight
19%5%23323246%48%
2050
March1st to 15thNight
17%6%23323335%48%
2165
16th to endNight
16%6%23323346%47%
2288
April1st to 15thNight
14%5%24314347%47%
2142
16th to endNight
17%5%24423345%45%
1904
May1st to 15thNight
14%5%2443345%7%44%
1754
16th to endNight
9%415%33245%9%48%
1827
June1st to 15thNight
321222345%9%61%
1755
16th to endNight
6%4135%245%5%8%50%
1755
July1st to 15thNight
5%21331447%11%53%
1755
16th to endNight
5%21232346%9%56%
1846
August1st to 15thNight
11222346%11%61%
1810
16th to endNight
6%3133245%7%11%49%
2140
September1st to 15thNight
8%5%245%25%45%8%46%
2145
16th to endNight
9%6%25%5%3336%8%44%
2145
October1st to 15thNight
8%313423447%56%
2145
16th to endNight
11%312212135%62%
2448
November1st to 15thNight
11%424434346%50%
2290
16th to endNight
13%413212325%58%
2535
December1st to 15thNight
18%6%13322336%46%
2535
16th to endNight
19%7%2442234444%
2704

Percentage Cloud Cover SE (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
17%6%25%322235%46%
1746
16th to endDay
16%5%22323346%49%
1981
February1st to 15thDay
17%6%1432323448%
1900
16th to endDay
21%6%23213345%43%
1710
March1st to 15thDay
22%5%2432234444%
2125
16th to endDay
19%5%23312335%47%
2286
April1st to 15thDay
15%5%35%42335%5%44%
2136
16th to endDay
17%7%345%23345%43%
2326
May1st to 15thDay
16%7%35%6%3435%6%37%
2526
16th to endDay
16%6%35%5%3445%7%36%
2638
June1st to 15thDay
6%425%5%46%5%6%9%44%
2535
16th to endDay
11%7%36%6%45%5%7%9%32%
2535
July1st to 15thDay
9%5%25%6%45%5%6%8%38%
2535
16th to endDay
7%4145%46%6%6%11%41%
2674
August1st to 15thDay
32124345%6%11%54%
2399
16th to endDay
9%325%7%46%5%6%9%39%
2413
September1st to 15thDay
11%6%36%7%35%5%6%7%35%
2145
16th to endDay
12%6%26%5%345%5%7%40%
2145
October1st to 15thDay
10%414435%446%48%
2132
16th to endDay
11%31331233459%
2033
November1st to 15thDay
15%7%25%5%33446%40%
1895
16th to endDay
14%5%2431333453%
1755
December1st to 15thDay
22%6%13324345%42%
1755
16th to endDay
19%7%34323446%40%
1872
January1st to 15thNight
18%5%13313335%49%
2522
16th to endNight
18%424313335%49%
2606
February1st to 15thNight
19%5%13213235%50%
2282
16th to endNight
19%5%13323245%48%
2050
March1st to 15thNight
17%6%23323325%48%
2165
16th to endNight
18%5%33323346%46%
2288
April1st to 15thNight
15%5%24422347%47%
2142
16th to endNight
19%5%24413345%45%
1904
May1st to 15thNight
15%5%2442345%7%44%
1754
16th to endNight
11%42432336%9%47%
1827
June1st to 15thNight
4212323349%62%
1755
16th to endNight
7%424425%5%5%8%50%
1755
July1st to 15thNight
6%21322446%11%54%
1755
16th to endNight
6%2232436%10%55%
1846
August1st to 15thNight
11122346%11%62%
1810
16th to endNight
7%3133245%6%11%49%
2140
September1st to 15thNight
9%5%24425%448%46%
2145
16th to endNight
10%5%25%5%3345%7%44%
2145
October1st to 15thNight
9%313424347%56%
2145
16th to endNight
11%313312235%62%
2448
November1st to 15thNight
12%424424346%50%
2290
16th to endNight
14%41221223458%
2535
December1st to 15thNight
20%5%23313335%47%
2535
16th to endNight
20%6%2432243444%
2704

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
41%2416%21%13%
1747
16th to endDay
37%26%14%23%14%
1981
February1st to 15thDay
39%36%14%19%15%
1901
16th to endDay
42%36%15%19%12%
1710
March1st to 15thDay
44%47%12%17%12%
2125
16th to endDay
40%38%16%19%11%
2288
April1st to 15thDay
41%47%16%17%13%
2136
16th to endDay
43%37%19%15%10%
2326
May1st to 15thDay
45%5%8%15%18%6%
2526
16th to endDay
45%5%10%18%17%3
2642
June1st to 15thDay
32%7%12%23%19%4
2535
16th to endDay
45%7%11%20%12%2
2535
July1st to 15thDay
39%7%16%22%12%1
2396
16th to endDay
31%7%19%29%11%
2519
August1st to 15thDay
22%7%16%36%15%1
2385
16th to endDay
38%8%16%23%10%2
2413
September1st to 15thDay
45%8%9%17%15%4
2145
16th to endDay
40%7%10%17%15%8%
2145
October1st to 15thDay
34%5%11%18%18%11%
2132
16th to endDay
28%35%15%25%21%
2033
November1st to 15thDay
43%48%17%15%10%
1895
16th to endDay
35%36%13%21%19%
1755
December1st to 15thDay
45%36%16%18%9%
1755
16th to endDay
45%47%15%18%9%
1872
January1st to 15thNight
38%26%16%19%16%
2522
16th to endNight
37%35%15%21%17%
2606
February1st to 15thNight
37%36%14%19%19%
2292
16th to endNight
37%36%17%20%14%
2050
March1st to 15thNight
39%38%15%17%14%
2165
16th to endNight
38%410%15%20%11%
2288
April1st to 15thNight
36%5%9%16%17%15%
2142
16th to endNight
40%49%17%15%11%
1904
May1st to 15thNight
37%6%10%19%17%8%
1755
16th to endNight
32%415%28%15%3
1829
June1st to 15thNight
18%6%15%30%25%3
1755
16th to endNight
29%8%17%28%13%2
1755
July1st to 15thNight
22%8%23%30%12%1
1665
16th to endNight
20%9%25%34%9%
1738
August1st to 15thNight
15%7%25%37%14%1
1800
16th to endNight
26%9%24%27%8%2
2140
September1st to 15thNight
34%6%18%21%14%5%
2145
16th to endNight
36%6%14%19%14%8%
2145
October1st to 15thNight
26%5%12%26%17%11%
2145
16th to endNight
26%35%16%26%21%
2448
November1st to 15thNight
34%411%18%17%12%
2290
16th to endNight
29%38%15%22%20%
2535
December1st to 15thNight
40%45%18%20%11%
2535
16th to endNight
44%36%13%20%12%
2704

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
22%9%28%29%8%1
135
16th to endDay
16%11%30%26%13%1
144
February1st to 15thDay
24%15%28%18%12%
135
16th to endDay
30%15%30%20%2
120
March1st to 15thDay
25%12%34%21%4
135
16th to endDay
16%6%36%30%9%
144
April1st to 15thDay
14%14%34%29%6%
135
16th to endDay
17%7%36%31%7%
338
May1st to 15thDay
16%8%34%30%9%
543
16th to endDay
20%418%37%16%1
597
June1st to 15thDay
6%11%44%30%5%
570
16th to endDay
13%19%35%31%8%
570
July1st to 15thDay
7%8%32%40%10%
550
16th to endDay
41425%50%14%
595
August1st to 15thDay
5%328%45%15%
463
16th to endDay
9%6%28%36%18%
325
September1st to 15thDay
16%16%17%43%15%
180
16th to endDay
16%7%19%40%17%
180
October1st to 15thDay
7%10%32%35%14%
180
16th to endDay
25%318%24%20%7%
178
November1st to 15thDay
28%6%17%28%16%2
135
16th to endDay
17%10%26%21%16%7%
135
December1st to 15thDay
25%7%25%23%10%7%
135
16th to endDay
36%6%29%19%6%1
144
January1st to 15thNight
21%7%24%34%11%
975
16th to endNight
20%6%27%34%9%
942
February1st to 15thNight
21%9%29%31%7%
764
16th to endNight
24%10%37%25%3
684
March1st to 15thNight
19%7%35%31%5%
605
16th to endNight
18%7%37%30%4
624
April1st to 15thNight
15%9%39%30%4
584
16th to endNight
19%6%37%28%7%
579
May1st to 15thNight
17%5%37%34%5%
585
16th to endNight
12%232%38%14%
611
June1st to 15thNight
423%50%20%1
585
16th to endNight
6%116%49%24%1
585
July1st to 15thNight
5%9%47%32%3
555
16th to endNight
6%5%45%37%4
612
August1st to 15thNight
1448%39%5%
575
16th to endNight
8%441%42%4
621
September1st to 15thNight
11%434%43%5%
585
16th to endNight
12%10%29%42%4
582
October1st to 15thNight
9%111%39%33%4
585
16th to endNight
13%318%37%23%4
816
November1st to 15thNight
13%421%37%21%1
770
16th to endNight
16%6%20%35%18%2
975
December1st to 15thNight
23%6%22%31%15%
975
16th to endNight
25%6%24%32%10%
1040
Page generated at 2018-10-28 07:41:04. Version ac04

Copyright 2018 A. Danko


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