Whiteside
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Whiteside clear sky chart from 2005-11-06 to 2024-02-15.

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
38%
24606
19%
80257
13%
24496
46%
24496
23%
52143

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
21%
943
14%
4379
6%
926
31%
926
12%
3017
January11th to 20thNight
20%
950
15%
4145
7%
930
29%
930
11%
3018
January21st to endNight
20%
1039
11%
4493
5%
1023
28%
1023
11%
3419
February1st to 10thNight
21%
950
14%
2470
4%
950
27%
950
18%
1830
February11th to 20thNight
19%
788
18%
2220
5%
785
28%
785
21%
1502
February21st to endNight
18%
592
20%
1776
5%
592
31%
592
20%
1186
March1st to 10thNight
21%
676
19%
2116
7%
676
32%
676
21%
1380
March11th to 20thNight
30%
540
17%
1980
10%
540
40%
540
17%
1313
March21st to endNight
22%
594
11%
2088
6%
594
29%
594
13%
1510
April1st to 10thNight
27%
540
20%
1800
10%
540
41%
540
22%
1096
April11th to 20thNight
33%
533
21%
1775
15%
533
45%
533
24%
1104
April21st to endNight
26%
540
19%
1800
10%
540
40%
540
21%
1161
May1st to 10thNight
36%
540
15%
1729
10%
540
44%
540
24%
1108
May11th to 20thNight
41%
531
20%
1417
13%
531
46%
531
27%
961
May21st to endNight
52%
584
19%
1551
11%
582
57%
582
30%
1026
June1st to 10thNight
61%
540
19%
1440
14%
540
64%
540
41%
858
June11th to 20thNight
61%
540
23%
1440
15%
540
65%
540
38%
883
June21st to endNight
61%
540
23%
1440
14%
540
65%
540
42%
835
July1st to 10thNight
70%
525
19%
1400
15%
525
70%
525
37%
857
July11th to 20thNight
70%
522
24%
1392
19%
522
73%
522
45%
795
July21st to endNight
69%
591
25%
1627
24%
558
72%
558
41%
912
August1st to 10thNight
74%
537
22%
1601
24%
534
76%
534
38%
910
August11th to 20thNight
68%
534
25%
1737
28%
534
70%
534
35%
969
August21st to endNight
72%
594
25%
1980
30%
594
75%
594
41%
1032
September1st to 10thNight
62%
540
25%
1800
26%
540
66%
540
34%
1004
September11th to 20thNight
63%
540
34%
1800
32%
540
69%
540
35%
983
September21st to endNight
55%
698
30%
2004
21%
698
62%
698
39%
1116
October1st to 10thNight
50%
720
26%
2160
19%
720
55%
720
37%
1211
October11th to 20thNight
35%
720
28%
2160
15%
720
47%
720
31%
1265
October21st to endNight
27%
792
23%
2376
11%
792
38%
792
24%
1525
November1st to 10thNight
36%
740
26%
2401
15%
740
49%
740
31%
1339
November11th to 20thNight
30%
760
27%
2470
14%
760
46%
760
27%
1445
November21st to endNight
26%
893
20%
2603
10%
893
36%
893
24%
1709
December1st to 10thNight
23%
950
16%
2660
6%
950
33%
950
20%
1881
December11th to 20thNight
29%
949
18%
3159
8%
948
36%
948
20%
2075
December21st to endNight
18%
1041
9%
4868
5%
1026
27%
1026
8%
3908

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%7%36%5%3445%7%42%
78395
Night
13%8%36%5%3445%6%42%
80738
TransparencyDay
41%7%12%23%15%2
78104
Night
42%6%11%23%15%3
80549
SeeingDay
15%11%27%26%16%4
14602
Night
16%11%30%29%13%1
24624

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
10%12%5%11%6%345%5%7%32%
2527
11th to 20thDay
13%10%5%7%8%5%5%5%5%6%33%
2758
21st to endDay
18%17%8%7%5%3433428%
3135
February1st to 10thDay
16%10%6%7%5%3435%6%35%
1710
11th to 20thDay
14%10%46%6%45%5%5%6%36%
1722
21st to endDay
17%13%37%5%3344438%
1480
March1st to 10thDay
14%9%47%435%336%41%
1858
11th to 20thDay
18%10%36%5%35%446%36%
1980
21st to endDay
21%10%49%5%35%45%5%29%
2268
April1st to 10thDay
13%7%36%6%3445%6%43%
2160
11th to 20thDay
18%8%35%5%24445%41%
2134
21st to endDay
19%8%25%5%345%6%7%37%
2160
May1st to 10thDay
16%7%36%5%345%6%8%37%
2227
11th to 20thDay
16%6%26%6%35%46%7%38%
2479
21st to endDay
12%6%35%6%36%6%6%8%38%
2725
June1st to 10thDay
8%424435%6%7%9%48%
2520
11th to 20thDay
8%4245%345%6%8%50%
2520
21st to endDay
6%425%5%36%6%7%9%47%
2520
July1st to 10thDay
9%425%4345%8%11%45%
2520
11th to 20thDay
5%3246%346%6%10%50%
2520
21st to endDay
8%4245%35%6%6%10%47%
2591
August1st to 10thDay
8%5%35%6%36%5%7%10%42%
2328
11th to 20thDay
8%5%36%5%36%6%7%9%42%
2164
21st to endDay
7%425%5%245%6%9%51%
2376
September1st to 10thDay
12%5%2442435%6%52%
2160
11th to 20thDay
10%32443446%8%52%
2160
21st to endDay
6%5%245%3445%8%53%
1932
October1st to 10thDay
12%425%42245%6%53%
1800
11th to 20thDay
16%7%25%323335%50%
1800
21st to endDay
18%8%3443333446%
1980
November1st to 10thDay
11%5%24324447%54%
1674
11th to 20thDay
15%6%35%424447%46%
1710
21st to endDay
15%10%46%433446%41%
1576
December1st to 10thDay
13%10%47%6%2445%6%40%
1520
11th to 20thDay
14%9%46%5%3445%7%39%
1918
21st to endDay
19%14%5%9%7%445%45%24%
2783
January1st to 10thNight
14%10%7%9%5%35%44434%
4428
11th to 20thNight
13%12%5%9%7%48%6%4430%
4210
21st to endNight
22%17%6%7%5%24346%25%
4532
February1st to 10thNight
16%10%5%8%6%35%5%46%34%
2470
11th to 20thNight
15%8%36%6%345%46%40%
2219
21st to endNight
17%9%36%5%33345%41%
1776
March1st to 10thNight
15%10%36%434345%43%
2116
11th to 20thNight
18%7%46%435%45%7%36%
1980
21st to endNight
20%11%46%6%35%45%8%28%
2088
April1st to 10thNight
11%6%37%5%345%5%5%47%
1800
11th to 20thNight
13%7%35%5%3445%7%44%
1775
21st to endNight
19%8%35%434346%41%
1800
May1st to 10thNight
14%5%36%5%245%5%8%43%
1729
11th to 20thNight
16%7%25%6%3435%6%44%
1416
21st to endNight
11%6%246%25%6%7%9%42%
1551
June1st to 10thNight
7%3245%335%6%8%53%
1440
11th to 20thNight
6%5%25%4346%5%8%52%
1440
21st to endNight
5%3245%35%5%7%10%51%
1440
July1st to 10thNight
8%32443447%11%50%
1440
11th to 20thNight
5%224425%45%9%57%
1440
21st to endNight
7%3244345%7%10%52%
1723
August1st to 10thNight
7%3144346%5%9%53%
1611
11th to 20thNight
7%425%5%3445%8%53%
1737
21st to endNight
5%3245%3446%7%57%
1980
September1st to 10thNight
12%423423347%55%
1800
11th to 20thNight
9%425%42447%6%54%
1800
21st to endNight
6%5%245%3335%7%57%
2004
October1st to 10thNight
9%434424346%57%
2160
11th to 20thNight
13%5%2432445%6%52%
2160
21st to endNight
18%8%245%24335%46%
2376
November1st to 10thNight
9%5%25%324446%55%
2401
11th to 20thNight
13%6%25%43345%6%50%
2470
21st to endNight
17%9%35%424446%43%
2603
December1st to 10thNight
15%10%46%6%45%446%35%
2660
11th to 20thNight
16%9%46%5%2345%6%40%
3279
21st to endNight
18%20%6%9%7%4433421%
4884

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
49%8%12%20%9%1
2528
11th to 20thDay
50%7%13%18%11%
2758
21st to endDay
60%5%10%14%10%1
3135
February1st to 10thDay
50%6%12%21%10%1
1710
11th to 20thDay
47%6%13%19%13%2
1731
21st to endDay
49%411%21%12%3
1480
March1st to 10thDay
46%5%10%25%12%2
1858
11th to 20thDay
50%5%11%19%12%2
1980
21st to endDay
56%7%12%16%9%1
2268
April1st to 10thDay
41%6%11%25%16%1
2160
11th to 20thDay
45%5%10%24%13%3
2134
21st to endDay
45%7%13%21%13%1
2160
May1st to 10thDay
45%9%13%24%9%1
2227
11th to 20thDay
44%8%11%21%14%1
2483
21st to endDay
41%9%13%21%14%1
2725
June1st to 10thDay
29%9%15%29%15%2
2520
11th to 20thDay
31%8%14%24%20%3
2520
21st to endDay
30%10%17%23%16%4
2520
July1st to 10thDay
30%10%15%28%12%3
2451
11th to 20thDay
27%9%16%26%19%3
2445
21st to endDay
31%9%15%29%15%2
2447
August1st to 10thDay
35%9%15%26%13%1
2314
11th to 20thDay
35%9%16%26%14%1
2164
21st to endDay
28%8%13%27%19%6%
2376
September1st to 10thDay
33%6%12%25%19%5%
2160
11th to 20thDay
29%6%10%28%21%4
2160
21st to endDay
28%7%11%27%24%3
1932
October1st to 10thDay
32%5%10%26%23%4
1800
11th to 20thDay
37%410%23%22%4
1800
21st to endDay
42%5%9%24%17%3
1980
November1st to 10thDay
32%5%12%26%21%5%
1674
11th to 20thDay
39%410%24%19%4
1710
21st to endDay
45%6%10%25%14%
1576
December1st to 10thDay
44%6%14%23%12%
1520
11th to 20thDay
43%7%13%23%12%2
1915
21st to endDay
61%7%11%14%7%1
2783
January1st to 10thNight
52%6%10%23%8%1
4428
11th to 20thNight
57%5%10%19%8%1
4210
21st to endNight
61%5%10%18%6%1
4532
February1st to 10thNight
52%6%11%18%11%2
2470
11th to 20thNight
45%6%11%21%15%2
2220
21st to endNight
46%411%24%11%3
1776
March1st to 10thNight
44%5%10%23%15%2
2116
11th to 20thNight
47%6%10%21%13%3
1980
21st to endNight
55%6%13%18%8%1
2088
April1st to 10thNight
38%7%11%24%17%4
1800
11th to 20thNight
38%7%11%22%18%4
1775
21st to endNight
44%5%10%21%18%2
1800
May1st to 10thNight
39%8%15%21%16%1
1729
11th to 20thNight
42%7%11%23%16%1
1417
21st to endNight
36%9%16%19%17%3
1552
June1st to 10thNight
27%8%16%27%19%3
1440
11th to 20thNight
28%9%10%25%24%3
1440
21st to endNight
26%7%17%27%18%6%
1440
July1st to 10thNight
30%9%12%33%13%4
1400
11th to 20thNight
24%7%14%29%23%3
1392
21st to endNight
25%8%14%31%20%2
1627
August1st to 10thNight
26%9%15%32%15%2
1601
11th to 20thNight
29%7%12%30%21%2
1737
21st to endNight
24%7%15%26%22%6%
1980
September1st to 10thNight
30%7%11%24%23%6%
1800
11th to 20thNight
28%7%11%24%26%5%
1800
21st to endNight
27%6%10%25%28%4
2004
October1st to 10thNight
29%5%11%24%25%5%
2160
11th to 20thNight
33%5%8%28%20%5%
2160
21st to endNight
41%5%8%21%21%4
2376
November1st to 10thNight
30%6%12%25%20%6%
2401
11th to 20thNight
36%49%28%20%4
2470
21st to endNight
43%411%24%15%2
2603
December1st to 10thNight
49%6%12%22%10%1
2660
11th to 20thNight
44%6%11%22%16%1
3281
21st to endNight
66%6%9%11%7%1
4884

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
21%23%34%16%6%
270
11th to 20thDay
31%20%33%16%1
270
21st to endDay
17%23%42%15%3
297
February1st to 10thDay
27%21%37%14%2
270
11th to 20thDay
26%23%31%17%4
252
21st to endDay
30%19%35%13%3
198
March1st to 10thDay
19%24%43%13%1
240
11th to 20thDay
31%18%32%18%21
240
21st to endDay
34%17%32%14%3
354
April1st to 10thDay
19%13%41%20%6%1
420
11th to 20thDay
22%18%30%21%8%1
412
21st to endDay
21%17%36%20%5%1
420
May1st to 10thDay
16%16%35%23%8%2
459
11th to 20thDay
18%12%28%26%14%2
625
21st to endDay
13%10%28%28%14%7%
679
June1st to 10thDay
8%5%22%32%24%8%
630
11th to 20thDay
10%5%22%36%23%4
630
21st to endDay
6%7%29%37%17%4
630
July1st to 10thDay
10%314%29%32%12%
621
11th to 20thDay
5%422%36%28%6%
618
21st to endDay
9%218%35%29%7%
684
August1st to 10thDay
8%417%36%26%9%
626
11th to 20thDay
10%315%36%28%8%
478
21st to endDay
8%416%32%31%9%
495
September1st to 10thDay
13%417%30%27%8%
450
11th to 20thDay
7%318%35%26%11%
450
21st to endDay
7%10%25%30%22%8%
400
October1st to 10thDay
13%10%29%31%14%3
270
11th to 20thDay
21%22%27%24%5%
270
21st to endDay
29%19%30%18%5%
297
November1st to 10thDay
12%16%37%22%10%3
270
11th to 20thDay
20%17%36%20%7%1
270
21st to endDay
27%15%32%23%31
270
December1st to 10thDay
15%19%40%15%7%3
270
11th to 20thDay
21%17%40%19%3
270
21st to endDay
24%25%35%15%1
297
January1st to 10thNight
17%18%38%21%5%
950
11th to 20thNight
21%18%36%20%4
950
21st to endNight
19%17%39%23%2
1045
February1st to 10thNight
22%16%37%23%2
950
11th to 20thNight
21%15%41%22%2
788
21st to endNight
24%19%37%19%2
592
March1st to 10thNight
22%16%38%22%3
676
11th to 20thNight
22%10%34%27%6%
540
21st to endNight
26%12%34%24%4
594
April1st to 10thNight
16%17%36%26%5%
540
11th to 20thNight
15%14%34%27%9%1
533
21st to endNight
21%10%40%24%6%
540
May1st to 10thNight
17%9%31%33%9%1
540
11th to 20thNight
18%7%28%32%14%1
531
21st to endNight
12%424%38%20%2
584
June1st to 10thNight
7%223%41%25%1
540
11th to 20thNight
7%422%45%21%1
540
21st to endNight
6%125%46%21%1
540
July1st to 10thNight
10%211%38%34%6%
525
11th to 20thNight
6%116%44%30%3
522
21st to endNight
7%114%43%32%2
591
August1st to 10thNight
8%210%43%34%3
537
11th to 20thNight
8%114%40%33%4
534
21st to endNight
5%214%38%38%3
594
September1st to 10thNight
12%318%35%26%5%
540
11th to 20thNight
10%217%36%30%5%
540
21st to endNight
8%6%25%34%24%4
698
October1st to 10thNight
10%6%29%31%21%3
720
11th to 20thNight
17%12%33%27%10%1
720
21st to endNight
23%13%34%24%7%
792
November1st to 10thNight
12%11%38%28%10%
740
11th to 20thNight
17%15%36%26%6%
760
21st to endNight
21%14%36%23%6%
893
December1st to 10thNight
20%16%36%22%5%1
950
11th to 20thNight
23%12%33%28%5%
950
21st to endNight
25%19%34%21%2
1045
Page generated at 2024-02-12 05:35:30. Version ac07

Copyright 2024 Attilla Danko


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