Camp Perry
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Perry clear sky chart from 2005-11-06 to 2024-01-13.

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
50%
23392
24%
74412
17%
23335
58%
23335
29%
44720

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
26%
760
24%
2459
10%
757
41%
757
25%
1495
January11th to 20thNight
33%
729
25%
2204
14%
729
44%
729
22%
1454
January21st to endNight
28%
792
29%
2376
14%
792
43%
792
25%
1513
February1st to 10thNight
29%
720
24%
2160
11%
720
40%
720
24%
1395
February11th to 20thNight
27%
703
22%
2098
9%
699
39%
699
24%
1350
February21st to endNight
24%
592
22%
1776
9%
592
35%
592
24%
1161
March1st to 10thNight
33%
720
25%
2160
13%
720
42%
720
30%
1285
March11th to 20thNight
33%
720
21%
2093
11%
720
41%
720
26%
1356
March21st to endNight
36%
646
26%
2032
13%
646
49%
646
29%
1198
April1st to 10thNight
41%
540
26%
1800
18%
540
52%
540
28%
1033
April11th to 20thNight
42%
533
27%
1775
20%
533
54%
533
30%
1020
April21st to endNight
52%
540
29%
1800
23%
540
63%
540
36%
948
May1st to 10thNight
56%
540
26%
1729
20%
540
64%
540
37%
951
May11th to 20thNight
59%
531
21%
1592
16%
531
64%
531
32%
956
May21st to endNight
69%
582
24%
1744
20%
582
73%
582
35%
1031
June1st to 10thNight
68%
540
15%
1620
15%
540
68%
540
28%
1074
June11th to 20thNight
75%
540
20%
1620
17%
540
77%
540
41%
900
June21st to endNight
74%
540
17%
1620
16%
540
74%
540
32%
992
July1st to 10thNight
74%
525
13%
1575
12%
525
76%
525
27%
1027
July11th to 20thNight
78%
522
14%
1566
14%
522
78%
522
32%
976
July21st to endNight
76%
591
15%
1825
16%
558
78%
558
29%
1125
August1st to 10thNight
78%
537
15%
1778
17%
534
78%
534
30%
1056
August11th to 20thNight
72%
534
16%
1776
19%
534
72%
534
24%
1150
August21st to endNight
68%
594
19%
1980
24%
594
68%
594
23%
1302
September1st to 10thNight
67%
540
22%
1800
25%
540
68%
540
25%
1131
September11th to 20thNight
64%
720
23%
1980
19%
720
66%
720
34%
1231
September21st to endNight
65%
720
30%
1980
22%
720
69%
720
39%
1172
October1st to 10thNight
63%
720
30%
1980
24%
720
67%
720
44%
1102
October11th to 20thNight
57%
720
37%
1988
26%
720
66%
720
41%
1125
October21st to endNight
53%
792
32%
2452
27%
792
60%
792
35%
1383
November1st to 10thNight
55%
740
29%
2406
25%
740
64%
740
38%
1264
November11th to 20thNight
45%
760
32%
2470
23%
760
58%
760
35%
1337
November21st to endNight
42%
760
27%
2470
18%
760
54%
760
29%
1423
December1st to 10thNight
37%
760
26%
2470
18%
760
49%
760
26%
1503
December11th to 20thNight
34%
759
24%
2896
15%
758
44%
758
21%
1748
December21st to endNight
30%
830
15%
4362
14%
817
39%
817
14%
2553

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
12%5%25%5%35%5%6%8%43%
74791
Night
12%5%25%5%345%5%8%46%
74947
TransparencyDay
39%5%11%20%20%6%
74524
Night
37%5%10%19%21%8%
74733
SeeingDay
15%8%21%25%21%10%
13363
Night
14%7%22%30%22%5%
23401

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
19%7%34423445%45%
1706
11th to 20thDay
18%7%44435%5%45%42%
1796
21st to endDay
17%6%33424445%48%
1980
February1st to 10thDay
18%8%35%6%3445%7%39%
1800
11th to 20thDay
22%5%35%5%23445%41%
1748
21st to endDay
19%6%38%6%3345%5%39%
1480
March1st to 10thDay
15%6%25%5%34446%47%
1800
11th to 20thDay
16%7%36%6%35%45%6%39%
1867
21st to endDay
14%5%25%445%45%7%44%
2338
April1st to 10thDay
12%5%35%5%3446%7%47%
2160
11th to 20thDay
12%6%26%5%35%45%7%47%
2134
21st to endDay
8%424435%5%5%7%52%
2160
May1st to 10thDay
10%5%246%345%5%8%49%
2227
11th to 20thDay
8%425%6%46%5%7%9%43%
2301
21st to endDay
9%5%25%6%35%6%7%8%44%
2531
June1st to 10thDay
10%6%36%7%46%6%7%11%35%
2340
11th to 20thDay
7%3247%47%7%8%10%43%
2340
21st to endDay
7%5%25%5%46%7%8%12%39%
2340
July1st to 10thDay
9%5%36%7%5%7%8%8%10%32%
2340
11th to 20thDay
7%5%36%7%5%8%8%8%11%32%
2340
21st to endDay
6%425%7%5%9%7%9%11%34%
2381
August1st to 10thDay
5%426%7%5%6%7%10%12%36%
2148
11th to 20thDay
9%6%26%7%46%7%8%11%33%
2125
21st to endDay
12%5%36%8%46%6%6%9%35%
2376
September1st to 10thDay
8%6%36%6%5%5%5%6%7%42%
2142
11th to 20thDay
13%6%26%5%35%5%6%7%41%
1980
21st to endDay
10%5%25%5%3445%6%51%
1980
October1st to 10thDay
9%5%25%5%3445%6%54%
1980
11th to 20thDay
9%4245%34447%54%
1968
21st to endDay
13%5%25%423346%54%
1904
November1st to 10thDay
11%434423345%57%
1672
11th to 20thDay
13%5%145%23445%54%
1710
21st to endDay
14%6%25%5%2345%6%48%
1710
December1st to 10thDay
17%7%36%42445%6%42%
1710
11th to 20thDay
18%7%26%5%34445%42%
2153
21st to endDay
18%8%36%5%3445%6%39%
3124
January1st to 10thNight
17%8%35%323345%47%
2459
11th to 20thNight
17%8%36%5%34445%42%
2204
21st to endNight
18%6%35%5%32346%44%
2376
February1st to 10thNight
16%8%36%434447%41%
2160
11th to 20thNight
20%7%245%2334445%
2098
21st to endNight
18%6%36%43345%7%41%
1776
March1st to 10thNight
15%6%3432345%7%49%
2160
11th to 20thNight
16%6%345%35%45%7%43%
2093
21st to endNight
14%425%4345%6%6%48%
2032
April1st to 10thNight
11%425%5%25%5%5%8%47%
1800
11th to 20thNight
14%5%1443445%8%48%
1775
21st to endNight
8%423335%46%7%55%
1800
May1st to 10thNight
10%42443345%8%54%
1729
11th to 20thNight
7%5%246%36%5%7%11%44%
1592
21st to endNight
6%3245%46%6%7%9%48%
1744
June1st to 10thNight
6%5%26%7%5%7%7%7%11%36%
1620
11th to 20thNight
7%323435%6%8%12%49%
1620
21st to endNight
5%4346%46%7%7%12%42%
1620
July1st to 10thNight
8%436%5%48%7%8%12%37%
1620
11th to 20thNight
5%425%5%46%8%8%11%42%
1620
21st to endNight
5%425%6%48%6%9%11%40%
1933
August1st to 10thNight
5%3246%46%8%9%14%40%
1790
11th to 20thNight
7%5%26%7%45%7%7%13%37%
1776
21st to endNight
9%5%36%6%46%6%6%8%40%
1980
September1st to 10thNight
9%7%36%6%45%5%6%9%42%
1800
11th to 20thNight
11%5%24435%5%6%9%46%
1980
21st to endNight
8%5%25%5%2446%6%53%
1980
October1st to 10thNight
8%41432345%7%58%
1980
11th to 20thNight
12%42332335%7%57%
1988
21st to endNight
13%5%25%323335%56%
2452
November1st to 10thNight
10%414423445%59%
2406
11th to 20thNight
12%5%23423447%54%
2470
21st to endNight
14%5%245%3446%7%48%
2470
December1st to 10thNight
16%6%34423447%46%
2470
11th to 20thNight
17%7%35%5%23445%47%
3042
21st to endNight
18%7%35%5%3446%7%38%
4532

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
42%36%18%25%5%
1707
11th to 20thDay
46%36%17%22%7%
1796
21st to endDay
40%3420%25%7%
1980
February1st to 10thDay
45%37%19%18%7%
1800
11th to 20thDay
46%2418%20%8%
1758
21st to endDay
47%27%15%20%9%
1480
March1st to 10thDay
40%47%18%21%11%
1800
11th to 20thDay
46%410%15%19%6%
1867
21st to endDay
40%49%20%23%4
2338
April1st to 10thDay
37%310%21%22%7%
2160
11th to 20thDay
38%37%21%22%9%
2134
21st to endDay
30%5%8%23%30%4
2160
May1st to 10thDay
34%310%22%25%6%
2227
11th to 20thDay
35%6%16%24%17%3
2305
21st to endDay
36%6%12%22%21%3
2531
June1st to 10thDay
42%5%12%25%12%2
2340
11th to 20thDay
33%8%16%25%15%3
2340
21st to endDay
35%8%17%24%13%3
2340
July1st to 10thDay
42%9%19%20%8%2
2275
11th to 20thDay
42%9%21%19%8%1
2271
21st to endDay
39%10%21%22%7%1
2248
August1st to 10thDay
35%9%22%25%9%
2136
11th to 20thDay
42%9%19%18%10%4
2125
21st to endDay
44%7%16%18%11%4
2376
September1st to 10thDay
39%6%14%16%19%6%
2142
11th to 20thDay
41%5%12%16%21%5%
1980
21st to endDay
35%48%22%24%8%
1980
October1st to 10thDay
31%48%19%25%12%
1980
11th to 20thDay
30%45%23%28%10%
1968
21st to endDay
34%2417%30%12%
1904
November1st to 10thDay
31%35%19%29%13%
1672
11th to 20thDay
34%37%18%27%12%
1710
21st to endDay
37%38%17%25%9%
1710
December1st to 10thDay
44%37%19%20%7%
1710
11th to 20thDay
46%26%16%25%5%
2150
21st to endDay
47%35%22%21%3
3124
January1st to 10thNight
41%27%17%27%6%
2459
11th to 20thNight
45%36%18%21%7%
2204
21st to endNight
43%2316%28%8%
2376
February1st to 10thNight
45%27%16%21%9%
2160
11th to 20thNight
44%35%15%23%10%
2099
21st to endNight
44%48%15%17%12%
1776
March1st to 10thNight
36%38%16%23%13%
2160
11th to 20thNight
41%5%9%17%20%8%
2093
21st to endNight
36%38%23%22%7%
2032
April1st to 10thNight
36%411%19%20%10%
1800
11th to 20thNight
36%37%20%25%10%
1775
21st to endNight
28%410%24%26%8%
1800
May1st to 10thNight
31%310%23%26%7%
1729
11th to 20thNight
34%6%17%22%17%4
1593
21st to endNight
31%7%12%25%21%4
1745
June1st to 10thNight
40%7%17%19%15%2
1620
11th to 20thNight
26%6%21%26%17%4
1620
21st to endNight
33%8%19%21%15%4
1620
July1st to 10thNight
38%9%21%20%10%2
1575
11th to 20thNight
32%10%28%21%8%1
1566
21st to endNight
33%10%26%22%8%1
1825
August1st to 10thNight
31%10%21%29%9%1
1778
11th to 20thNight
38%10%19%17%10%5%
1776
21st to endNight
42%9%14%18%13%4
1980
September1st to 10thNight
39%8%13%18%15%7%
1800
11th to 20thNight
34%7%13%19%21%6%
1980
21st to endNight
31%5%9%23%23%9%
1980
October1st to 10thNight
26%5%9%19%25%15%
1980
11th to 20thNight
29%45%20%30%13%
1988
21st to endNight
33%2416%28%17%
2452
November1st to 10thNight
28%38%17%27%16%
2406
11th to 20thNight
32%2419%28%14%
2470
21st to endNight
36%37%20%21%12%
2470
December1st to 10thNight
40%310%19%22%6%
2470
11th to 20thNight
42%26%13%30%6%
3044
21st to endNight
45%35%21%23%3
4532

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
24%21%36%15%3
270
11th to 20thDay
22%20%32%18%7%1
246
21st to endDay
24%23%34%15%31
264
February1st to 10thDay
27%20%31%18%4
240
11th to 20thDay
32%21%30%16%1
240
21st to endDay
24%19%42%14%1
198
March1st to 10thDay
22%20%37%16%41
240
11th to 20thDay
22%18%32%20%8%
307
21st to endDay
22%16%31%22%10%
462
April1st to 10thDay
19%14%29%22%14%2
420
11th to 20thDay
17%12%32%26%10%3
412
21st to endDay
13%10%29%29%16%2
420
May1st to 10thDay
13%9%25%30%19%4
423
11th to 20thDay
8%422%31%25%11%
447
21st to endDay
11%5%16%32%19%16%
485
June1st to 10thDay
13%214%29%24%16%
450
11th to 20thDay
9%212%25%32%21%
450
21st to endDay
9%211%28%30%20%
450
July1st to 10thDay
8%36%25%33%25%
445
11th to 20thDay
6%2423%34%30%
444
21st to endDay
6%16%21%43%23%
488
August1st to 10thDay
8%26%20%36%27%
446
11th to 20thDay
8%2427%38%21%
439
21st to endDay
14%27%23%32%22%
495
September1st to 10thDay
6%48%31%33%17%
450
11th to 20thDay
13%412%26%33%13%
450
21st to endDay
11%311%34%28%12%
450
October1st to 10thDay
11%421%34%22%8%
450
11th to 20thDay
10%7%23%32%25%3
438
21st to endDay
19%14%20%32%11%3
297
November1st to 10thDay
20%7%29%28%12%4
270
11th to 20thDay
17%7%42%24%8%1
270
21st to endDay
13%14%33%29%10%1
270
December1st to 10thDay
24%17%29%22%8%
270
11th to 20thDay
26%13%36%19%7%
270
21st to endDay
27%11%34%23%5%1
297
January1st to 10thNight
22%12%36%24%5%
760
11th to 20thNight
21%13%27%29%9%
729
21st to endNight
21%12%34%29%4
792
February1st to 10thNight
21%12%33%29%6%
720
11th to 20thNight
24%13%33%25%6%
703
21st to endNight
22%14%36%25%2
592
March1st to 10thNight
17%13%32%30%8%
720
11th to 20thNight
18%12%33%24%13%
720
21st to endNight
17%11%32%28%11%
646
April1st to 10thNight
12%9%34%30%14%
540
11th to 20thNight
16%9%29%27%16%2
533
21st to endNight
9%8%27%37%18%1
540
May1st to 10thNight
10%5%24%38%20%4
540
11th to 20thNight
8%320%39%25%5%
531
21st to endNight
8%111%36%36%7%
584
June1st to 10thNight
9%19%39%37%6%
540
11th to 20thNight
7%19%28%43%11%
540
21st to endNight
5%27%29%44%13%
540
July1st to 10thNight
7%2427%42%18%
525
11th to 20thNight
5%1223%47%21%
522
21st to endNight
5%2424%50%15%
591
August1st to 10thNight
6%1320%49%21%
537
11th to 20thNight
8%2230%47%11%
534
21st to endNight
10%36%25%39%16%
594
September1st to 10thNight
12%26%28%39%12%
540
11th to 20thNight
13%311%29%39%5%
720
21st to endNight
9%213%31%40%5%
720
October1st to 10thNight
10%219%37%28%5%
720
11th to 20thNight
14%420%37%23%1
720
21st to endNight
16%6%20%35%21%2
792
November1st to 10thNight
12%5%22%36%21%3
740
11th to 20thNight
14%7%30%36%13%1
760
21st to endNight
16%8%29%34%12%2
760
December1st to 10thNight
19%12%27%30%12%1
760
11th to 20thNight
22%8%30%30%9%
760
21st to endNight
25%10%27%32%5%
836
Page generated at 2024-01-10 00:25:05. Version ac07

Copyright 2024 Attilla Danko


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