England/Idlewild Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the England/Idlewild Park clear sky chart from 2005-11-06 to 2024-01-12.

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
42%
23991
19%
74302
14%
23942
48%
23942
23%
49112

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 10thNight
23%
950
14%
2648
6%
946
30%
946
14%
2026
January11th to 20thNight
18%
792
13%
2425
7%
792
25%
792
12%
1876
January21st to endNight
21%
792
15%
2574
8%
792
30%
792
14%
1878
February1st to 10thNight
22%
720
12%
2218
7%
720
27%
720
13%
1669
February11th to 20thNight
21%
701
16%
2099
8%
700
28%
700
17%
1490
February21st to endNight
19%
592
15%
1776
7%
592
28%
592
15%
1301
March1st to 10thNight
28%
720
17%
2160
11%
720
33%
720
20%
1460
March11th to 20thNight
27%
720
17%
1980
9%
720
34%
720
22%
1369
March21st to endNight
31%
792
16%
2178
9%
792
38%
792
21%
1543
April1st to 10thNight
36%
572
20%
1832
14%
572
46%
572
24%
1174
April11th to 20thNight
41%
533
22%
1742
15%
533
51%
533
25%
1088
April21st to endNight
33%
540
20%
1620
9%
540
44%
540
24%
1071
May1st to 10thNight
38%
540
15%
1620
8%
540
43%
540
22%
1114
May11th to 20thNight
47%
531
15%
1592
11%
531
51%
531
25%
1057
May21st to endNight
62%
583
18%
1745
14%
582
65%
582
32%
1052
June1st to 10thNight
63%
540
19%
1601
16%
540
67%
540
37%
928
June11th to 20thNight
62%
540
22%
1440
17%
540
66%
540
38%
862
June21st to endNight
63%
540
21%
1440
15%
540
67%
540
39%
850
July1st to 10thNight
65%
525
18%
1400
14%
525
67%
525
34%
892
July11th to 20thNight
71%
522
22%
1455
17%
522
73%
522
40%
836
July21st to endNight
67%
591
23%
1672
20%
558
71%
558
36%
973
August1st to 10thNight
72%
537
23%
1600
22%
534
73%
534
37%
917
August11th to 20thNight
70%
534
25%
1603
22%
534
73%
534
35%
945
August21st to endNight
75%
594
25%
1980
26%
594
76%
594
40%
1022
September1st to 10thNight
66%
620
24%
1880
22%
620
69%
620
36%
1083
September11th to 20thNight
68%
720
32%
1980
25%
720
71%
720
41%
1137
September21st to endNight
54%
720
29%
1980
22%
720
59%
720
35%
1212
October1st to 10thNight
59%
720
30%
1980
23%
720
65%
720
41%
1132
October11th to 20thNight
45%
720
26%
2114
20%
720
53%
720
29%
1313
October21st to endNight
36%
792
23%
2524
17%
792
46%
792
23%
1638
November1st to 10thNight
45%
740
26%
2406
21%
740
54%
740
29%
1409
November11th to 20thNight
34%
760
24%
2470
16%
760
46%
760
23%
1572
November21st to endNight
33%
760
20%
2470
14%
760
41%
760
18%
1683
December1st to 10thNight
24%
760
14%
2470
7%
760
33%
760
16%
1771
December11th to 20thNight
27%
759
17%
2977
11%
759
34%
759
14%
2072
December21st to endNight
20%
919
8%
4651
7%
912
27%
912
7%
3697

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
14%8%36%6%35%5%5%7%37%
75099
Night
15%9%36%5%3445%7%38%
74604
TransparencyDay
47%310%23%15%2
74812
Night
46%310%23%15%3
74411
SeeingDay
19%8%24%25%17%8%
14187
Night
20%7%24%31%17%2
24007

By Month

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 10thDay
16%14%5%9%6%33446%30%
1517
11th to 20thDay
20%12%6%9%7%44445%25%
1557
21st to endDay
16%13%5%9%8%3445%6%27%
1782
February1st to 10thDay
20%12%6%8%424445%30%
1737
11th to 20thDay
16%12%5%9%6%35%35%6%30%
1748
21st to endDay
19%13%6%8%5%24445%31%
1480
March1st to 10thDay
19%8%47%5%3446%5%36%
1800
11th to 20thDay
19%10%46%6%3445%6%33%
1979
21st to endDay
20%12%46%6%345%5%6%29%
2178
April1st to 10thDay
14%8%46%5%345%5%8%36%
2142
11th to 20thDay
17%7%36%5%4445%6%39%
2164
21st to endDay
19%7%26%7%345%5%7%35%
2340
May1st to 10thDay
21%7%35%6%45%5%5%6%34%
2340
11th to 20thDay
19%9%36%5%35%45%8%34%
2301
21st to endDay
9%5%37%7%47%6%8%9%35%
2531
June1st to 10thDay
12%6%25%6%35%6%6%8%42%
2354
11th to 20thDay
9%5%25%6%36%5%6%9%43%
2520
21st to endDay
9%5%36%6%46%6%6%10%40%
2520
July1st to 10thDay
12%6%25%7%45%6%7%9%38%
2520
11th to 20thDay
8%5%25%5%46%6%7%11%41%
2453
21st to endDay
10%5%25%6%46%5%6%9%41%
2547
August1st to 10thDay
8%426%7%45%5%7%9%43%
2327
11th to 20thDay
9%6%26%7%36%6%7%10%39%
2295
21st to endDay
7%5%26%5%35%6%6%10%46%
2376
September1st to 10thDay
14%5%25%435%5%48%45%
2062
11th to 20thDay
9%425%5%346%6%9%47%
1980
21st to endDay
14%6%25%433446%50%
1980
October1st to 10thDay
11%5%26%6%45%445%49%
1980
11th to 20thDay
13%6%26%5%3346%7%44%
1846
21st to endDay
19%8%36%434346%38%
1828
November1st to 10thDay
10%6%35%424436%54%
1672
11th to 20thDay
14%9%5%7%5%2446%7%38%
1710
21st to endDay
18%9%47%5%33447%38%
1710
December1st to 10thDay
21%13%5%8%7%33445%28%
1710
11th to 20thDay
15%14%5%8%7%4445%5%30%
2153
21st to endDay
21%20%5%7%7%34436%19%
2960
January1st to 10thNight
17%12%5%10%6%35%5%45%27%
2648
11th to 20thNight
19%16%5%9%6%4443426%
2425
21st to endNight
18%14%6%8%6%34445%29%
2574
February1st to 10thNight
22%12%49%6%35%445%27%
2218
11th to 20thNight
17%11%48%6%3445%7%31%
2098
21st to endNight
22%14%5%7%423446%29%
1776
March1st to 10thNight
17%10%46%5%3445%6%37%
2160
11th to 20thNight
19%8%37%43445%7%36%
1980
21st to endNight
19%9%37%6%345%47%34%
2178
April1st to 10thNight
14%7%46%5%35%5%6%8%39%
1832
11th to 20thNight
14%8%36%5%245%5%7%40%
1742
21st to endNight
18%7%35%5%35%5%5%7%37%
1620
May1st to 10thNight
18%7%36%6%345%6%8%34%
1620
11th to 20thNight
16%6%36%5%445%6%8%37%
1592
21st to endNight
7%6%345%46%7%6%13%41%
1744
June1st to 10thNight
8%5%245%3446%10%49%
1601
11th to 20thNight
8%5%35%4345%5%12%47%
1440
21st to endNight
6%3346%347%7%10%47%
1440
July1st to 10thNight
11%5%35%5%35%36%10%45%
1440
11th to 20thNight
6%424445%5%7%9%50%
1503
21st to endNight
8%5%25%5%4445%9%48%
1771
August1st to 10thNight
7%436%43447%10%48%
1611
11th to 20thNight
6%5%25%5%35%5%7%11%46%
1603
21st to endNight
6%4244335%6%10%54%
1980
September1st to 10thNight
13%5%144335%5%7%51%
1880
11th to 20thNight
8%4243345%6%8%53%
1980
21st to endNight
14%6%25%433346%51%
1980
October1st to 10thNight
8%4245%3445%7%55%
1980
11th to 20thNight
15%6%35%43446%6%45%
2114
21st to endNight
19%9%35%434446%40%
2524
November1st to 10thNight
12%7%35%5%235%5%6%48%
2406
11th to 20thNight
16%8%37%42445%7%40%
2470
21st to endNight
19%10%35%6%34446%35%
2470
December1st to 10thNight
20%11%5%7%5%3445%6%29%
2470
11th to 20thNight
18%12%5%8%6%34346%31%
3042
21st to endNight
19%19%7%10%7%44445%18%
4692

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 10thDay
57%28%18%14%1
1518
11th to 20thDay
62%38%18%8%1
1557
21st to endDay
59%210%22%7%1
1782
February1st to 10thDay
58%28%20%10%2
1737
11th to 20thDay
56%39%21%11%1
1758
21st to endDay
56%29%21%10%2
1480
March1st to 10thDay
51%210%24%12%1
1800
11th to 20thDay
54%310%19%12%2
1979
21st to endDay
57%39%21%9%1
2178
April1st to 10thDay
46%411%24%14%2
2142
11th to 20thDay
46%29%23%17%4
2164
21st to endDay
49%310%24%12%3
2340
May1st to 10thDay
52%412%22%10%1
2340
11th to 20thDay
49%413%19%13%1
2305
21st to endDay
43%5%15%22%13%1
2531
June1st to 10thDay
40%411%26%17%2
2354
11th to 20thDay
37%5%13%25%19%2
2520
21st to endDay
40%5%14%23%14%5%
2520
July1st to 10thDay
42%413%20%18%3
2451
11th to 20thDay
37%5%13%25%18%2
2378
21st to endDay
39%413%25%15%3
2405
August1st to 10thDay
37%414%28%16%2
2314
11th to 20thDay
40%312%28%16%1
2295
21st to endDay
35%414%24%17%6%
2376
September1st to 10thDay
39%310%24%19%6%
2062
11th to 20thDay
34%411%27%22%3
1980
21st to endDay
36%39%27%23%2
1980
October1st to 10thDay
38%38%25%23%3
1980
11th to 20thDay
39%37%27%21%3
1846
21st to endDay
48%19%23%15%2
1828
November1st to 10thDay
34%38%30%22%3
1672
11th to 20thDay
46%36%24%17%4
1710
21st to endDay
49%29%24%15%1
1710
December1st to 10thDay
62%29%19%8%1
1710
11th to 20thDay
58%26%21%13%1
2150
21st to endDay
69%28%13%8%1
2960
January1st to 10thNight
61%36%19%10%1
2648
11th to 20thNight
64%28%18%7%1
2425
21st to endNight
59%28%21%8%1
2574
February1st to 10thNight
62%210%20%6%1
2218
11th to 20thNight
54%39%22%11%1
2099
21st to endNight
58%210%18%9%3
1776
March1st to 10thNight
50%36%24%15%2
2160
11th to 20thNight
49%311%21%13%2
1980
21st to endNight
52%311%24%9%2
2178
April1st to 10thNight
44%39%28%13%2
1832
11th to 20thNight
43%210%19%19%6%
1742
21st to endNight
46%311%23%13%4
1620
May1st to 10thNight
49%412%22%10%3
1620
11th to 20thNight
45%415%20%13%2
1593
21st to endNight
35%5%17%23%16%3
1745
June1st to 10thNight
32%413%27%21%3
1601
11th to 20thNight
32%5%14%25%20%5%
1440
21st to endNight
30%5%17%24%17%6%
1440
July1st to 10thNight
37%5%14%23%17%5%
1400
11th to 20thNight
29%5%15%28%20%3
1455
21st to endNight
33%413%30%18%2
1672
August1st to 10thNight
32%415%31%16%2
1600
11th to 20thNight
33%5%12%31%17%2
1603
21st to endNight
27%317%27%20%5%
1980
September1st to 10thNight
33%412%27%18%7%
1880
11th to 20thNight
29%49%29%26%3
1980
21st to endNight
37%27%25%25%3
1980
October1st to 10thNight
30%39%29%25%4
1980
11th to 20thNight
40%36%26%22%3
2114
21st to endNight
46%37%23%18%3
2524
November1st to 10thNight
38%39%23%24%4
2406
11th to 20thNight
45%28%22%19%4
2470
21st to endNight
52%29%21%14%1
2470
December1st to 10thNight
57%210%20%10%1
2470
11th to 20thNight
55%28%22%12%1
3044
21st to endNight
70%28%14%6%
4692

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 10thDay
23%14%36%20%6%
270
11th to 20thDay
28%16%36%15%5%
243
21st to endDay
28%19%33%19%2
264
February1st to 10thDay
32%16%36%13%3
240
11th to 20thDay
30%20%37%11%2
240
21st to endDay
31%15%42%9%4
198
March1st to 10thDay
21%20%43%15%2
240
11th to 20thDay
26%11%37%18%7%1
419
21st to endDay
31%13%30%18%7%1
462
April1st to 10thDay
22%14%27%23%12%2
420
11th to 20thDay
20%15%25%25%9%5%
412
21st to endDay
25%10%32%20%9%4
420
May1st to 10thDay
24%8%32%22%9%5%
423
11th to 20thDay
23%422%28%15%7%
447
21st to endDay
15%321%26%22%12%
485
June1st to 10thDay
15%317%30%24%11%
464
11th to 20thDay
11%320%35%22%9%
630
21st to endDay
11%323%32%21%11%
630
July1st to 10thDay
15%211%25%25%22%
621
11th to 20thDay
10%217%30%26%15%
551
21st to endDay
14%112%31%26%17%
488
August1st to 10thDay
12%210%27%30%21%
446
11th to 20thDay
14%211%33%25%15%
439
21st to endDay
11%213%26%32%16%
495
September1st to 10thDay
15%212%27%30%13%
450
11th to 20thDay
10%214%25%30%18%
450
21st to endDay
18%420%24%24%10%
450
October1st to 10thDay
11%321%36%21%8%
450
11th to 20thDay
17%12%28%27%13%3
450
21st to endDay
26%6%37%21%9%1
343
November1st to 10thDay
14%11%32%29%10%4
270
11th to 20thDay
21%14%33%20%9%2
270
21st to endDay
24%9%34%23%9%
270
December1st to 10thDay
21%17%35%18%8%1
270
11th to 20thDay
19%14%41%17%8%1
270
21st to endDay
31%13%32%18%41
297
January1st to 10thNight
23%13%31%27%5%
950
11th to 20thNight
31%11%32%21%4
792
21st to endNight
26%11%35%24%4
792
February1st to 10thNight
29%11%31%26%3
720
11th to 20thNight
26%14%33%24%2
703
21st to endNight
29%11%35%24%2
592
March1st to 10thNight
24%12%29%29%5%
720
11th to 20thNight
26%10%32%24%8%1
720
21st to endNight
23%9%30%30%8%
792
April1st to 10thNight
18%9%31%32%9%
572
11th to 20thNight
21%9%26%32%11%2
533
21st to endNight
21%5%33%31%9%1
540
May1st to 10thNight
21%430%30%13%1
540
11th to 20thNight
19%221%36%19%3
531
21st to endNight
10%216%38%29%5%
584
June1st to 10thNight
11%117%44%24%3
540
11th to 20thNight
11%313%39%31%4
540
21st to endNight
7%117%42%29%4
540
July1st to 10thNight
13%19%31%35%11%
525
11th to 20thNight
9%19%37%40%5%
522
21st to endNight
13%18%37%36%5%
591
August1st to 10thNight
10%15%37%42%5%
537
11th to 20thNight
10%18%40%35%5%
534
21st to endNight
7%17%36%41%8%
594
September1st to 10thNight
16%210%32%35%6%
620
11th to 20thNight
11%211%30%40%6%
720
21st to endNight
17%218%34%26%3
720
October1st to 10thNight
11%321%35%25%5%
720
11th to 20thNight
19%7%22%35%15%2
720
21st to endNight
25%6%28%29%11%1
792
November1st to 10thNight
17%6%26%32%18%1
740
11th to 20thNight
22%11%28%28%11%1
760
21st to endNight
26%9%27%29%9%1
760
December1st to 10thNight
28%8%33%25%6%
760
11th to 20thNight
26%9%31%26%8%1
760
21st to endNight
30%10%30%26%4
931
Page generated at 2024-01-09 07:14:40. Version ac07

Copyright 2024 Attilla Danko


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