Whitney Pockets
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Whitney Pockets 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
69%
24275
36%
74392
30%
24234
75%
24234
53%
34972

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
61%
756
33%
2457
29%
756
69%
756
45%
1212
January11th to 20thNight
67%
732
37%
2378
35%
732
74%
732
49%
1112
January21st to endNight
60%
792
36%
2574
31%
792
70%
792
42%
1296
February1st to 10thNight
61%
720
34%
2196
28%
720
71%
720
49%
1079
February11th to 20thNight
57%
700
35%
2099
28%
700
68%
700
44%
1083
February21st to endNight
53%
592
35%
1776
32%
592
63%
592
44%
930
March1st to 10thNight
60%
720
31%
2116
26%
720
68%
720
46%
1079
March11th to 20thNight
58%
720
33%
1980
26%
720
65%
720
47%
1072
March21st to endNight
58%
792
34%
2178
21%
792
69%
792
50%
1134
April1st to 10thNight
59%
720
32%
1912
19%
720
65%
720
53%
973
April11th to 20thNight
53%
689
35%
1757
17%
689
64%
689
55%
900
April21st to endNight
63%
540
42%
1620
26%
540
73%
540
58%
710
May1st to 10thNight
62%
540
36%
1620
23%
540
70%
540
56%
737
May11th to 20thNight
69%
531
39%
1595
28%
531
75%
531
65%
669
May21st to endNight
65%
582
33%
1746
23%
582
73%
582
57%
777
June1st to 10thNight
75%
540
35%
1620
28%
540
80%
540
72%
648
June11th to 20thNight
71%
540
35%
1620
29%
540
76%
540
71%
642
June21st to endNight
78%
540
34%
1620
30%
540
81%
540
74%
646
July1st to 10thNight
83%
525
32%
1575
29%
525
84%
525
65%
683
July11th to 20thNight
81%
522
29%
1566
26%
522
81%
522
51%
774
July21st to endNight
80%
591
29%
1674
26%
558
81%
558
45%
873
August1st to 10thNight
79%
537
37%
1602
29%
534
80%
534
57%
747
August11th to 20thNight
85%
570
42%
1638
32%
570
86%
570
64%
734
August21st to endNight
84%
792
40%
1980
29%
792
85%
792
65%
998
September1st to 10thNight
81%
720
39%
1934
29%
720
84%
720
64%
918
September11th to 20thNight
84%
720
44%
1980
38%
720
87%
720
73%
870
September21st to endNight
79%
720
44%
1980
34%
720
85%
720
73%
855
October1st to 10thNight
71%
720
40%
1980
30%
720
80%
720
61%
940
October11th to 20thNight
77%
720
45%
2100
38%
720
84%
720
69%
891
October21st to endNight
71%
792
44%
2420
36%
792
81%
792
67%
991
November1st to 10thNight
75%
740
39%
2405
39%
740
81%
740
60%
1009
November11th to 20thNight
75%
760
41%
2470
40%
760
83%
760
63%
1006
November21st to endNight
66%
760
40%
2470
36%
760
76%
760
55%
1097
December1st to 10thNight
64%
760
34%
2470
33%
760
69%
760
46%
1198
December11th to 20thNight
63%
758
33%
2900
32%
758
69%
758
35%
1510
December21st to endNight
57%
822
20%
4384
28%
817
64%
817
24%
2179

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
4313323346%69%
74909
Night
4313323346%67%
74875
TransparencyDay
17%25%15%27%33%
74636
Night
19%2415%27%32%
74670
SeeingDay
5%9%23%34%22%6%
14010
Night
5%317%39%29%6%
24301

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 10thDay
7%424324445%61%
1708
11th to 20thDay
6%42332335%7%63%
1638
21st to endDay
7%5%2432345%5%60%
1782
February1st to 10thDay
5%413322446%66%
1760
11th to 20thDay
7%414324346%61%
1750
21st to endDay
8%5%245%23336%61%
1480
March1st to 10thDay
6%423324447%60%
1843
11th to 20thDay
5%5%23434347%61%
1980
21st to endDay
5%32442435%7%60%
2178
April1st to 10thDay
3324324446%63%
2043
11th to 20thDay
4313312345%70%
2151
21st to endDay
4312214335%72%
2340
May1st to 10thDay
121232235%7%71%
2340
11th to 20thDay
2212212345%77%
2301
21st to endDay
1212322337%74%
2530
June1st to 10thDay
2111212225%79%
2340
11th to 20thDay
11111123482%
2340
21st to endDay
211211223481%
2340
July1st to 10thDay
1113323346%73%
2340
11th to 20thDay
332332345%8%65%
2340
21st to endDay
43245%35%7%6%9%54%
2545
August1st to 10thDay
221232335%7%71%
2328
11th to 20thDay
22222335%7%72%
2260
21st to endDay
2212323346%73%
2376
September1st to 10thDay
221231334474%
2025
11th to 20thDay
11121222484%
1980
21st to endDay
121221223480%
1980
October1st to 10thDay
3212322345%72%
1980
11th to 20thDay
221121233379%
1859
21st to endDay
2112211326%79%
1933
November1st to 10thDay
3322212336%74%
1674
11th to 20thDay
3213322235%74%
1710
21st to endDay
5%313324337%67%
1710
December1st to 10thDay
5%425%423346%62%
1710
11th to 20thDay
8%6%25%43448%9%48%
2169
21st to endDay
7%5%244345%6%7%51%
3146
January1st to 10thNight
8%5%2432235%6%60%
2457
11th to 20thNight
6%42332335%8%62%
2378
21st to endNight
7%5%2442345%6%58%
2574
February1st to 10thNight
5%5%14323336%65%
2196
11th to 20thNight
8%423323345%62%
2098
21st to endNight
8%5%2432335%6%59%
1776
March1st to 10thNight
7%4233245%6%7%57%
2116
11th to 20thNight
7%5%2442335%6%59%
1980
21st to endNight
5%414423445%64%
2178
April1st to 10thNight
432432335%6%66%
1912
11th to 20thNight
332342335%5%67%
1757
21st to endNight
421231335%7%70%
1620
May1st to 10thNight
321321435%6%70%
1620
11th to 20thNight
2212212346%77%
1594
21st to endNight
2212333346%71%
1746
June1st to 10thNight
1112222235%80%
1620
11th to 20thNight
211121323481%
1620
21st to endNight
11122223482%
1620
July1st to 10thNight
22231335%5%74%
1620
11th to 20thNight
332443346%7%62%
1620
21st to endNight
3335%435%6%6%8%53%
1773
August1st to 10thNight
4312322445%69%
1611
11th to 20thNight
221232335%6%71%
1638
21st to endNight
2212323445%72%
1980
September1st to 10thNight
321222235%6%72%
1934
11th to 20thNight
121221222482%
1980
21st to endNight
2112212225%81%
1980
October1st to 10thNight
4312212335%73%
1980
11th to 20thNight
221221223381%
2100
21st to endNight
3212212345%77%
2420
November1st to 10thNight
3312222235%74%
2405
11th to 20thNight
4212212346%74%
2470
21st to endNight
4313322346%69%
2470
December1st to 10thNight
7%5%1332335%6%61%
2470
11th to 20thNight
9%6%2442445%7%53%
3041
21st to endNight
8%6%35%5%245%5%6%49%
4521

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
25%39%26%32%6%
1709
11th to 20thDay
21%28%27%31%11%
1638
21st to endDay
25%27%26%33%8%
1782
February1st to 10thDay
19%29%19%31%19%
1760
11th to 20thDay
23%25%20%30%20%
1760
21st to endDay
26%36%20%27%18%
1480
March1st to 10thDay
23%25%19%33%17%
1843
11th to 20thDay
24%25%17%37%16%
1980
21st to endDay
22%26%23%30%17%
2178
April1st to 10thDay
20%2417%30%27%
2043
11th to 20thDay
17%2414%29%34%
2154
21st to endDay
16%2215%33%32%
2340
May1st to 10thDay
13%35%12%32%35%
2340
11th to 20thDay
10%1314%32%39%
2304
21st to endDay
13%2310%33%40%
2530
June1st to 10thDay
9%217%24%57%
2340
11th to 20thDay
8%116%17%67%
2340
21st to endDay
9%11317%69%
2340
July1st to 10thDay
13%338%14%60%
2276
11th to 20thDay
18%35%13%23%38%
2271
21st to endDay
23%49%18%20%26%
2404
August1st to 10thDay
14%35%12%21%44%
2313
11th to 20thDay
13%3412%25%44%
2260
21st to endDay
14%2212%27%43%
2376
September1st to 10thDay
14%2410%21%48%
2025
11th to 20thDay
9%1210%26%51%
1980
21st to endDay
11%229%26%50%
1980
October1st to 10thDay
15%2414%24%41%
1980
11th to 20thDay
11%2310%31%43%
1859
21st to endDay
9%15%14%32%38%
1933
November1st to 10thDay
15%1318%35%28%
1674
11th to 20thDay
14%26%16%35%27%
1710
21st to endDay
19%25%19%35%21%
1710
December1st to 10thDay
23%38%22%28%16%
1710
11th to 20thDay
30%410%24%26%6%
2168
21st to endDay
29%411%25%23%8%
3146
January1st to 10thNight
25%27%26%32%9%
2457
11th to 20thNight
21%25%27%29%16%
2378
21st to endNight
26%27%23%30%11%
2574
February1st to 10thNight
22%28%17%31%20%
2196
11th to 20thNight
25%2417%26%25%
2099
21st to endNight
26%25%16%32%19%
1776
March1st to 10thNight
23%36%19%32%17%
2116
11th to 20thNight
26%2316%31%21%
1980
21st to endNight
22%36%19%32%18%
2178
April1st to 10thNight
20%2415%30%28%
1912
11th to 20thNight
17%3316%29%31%
1757
21st to endNight
14%1414%31%35%
1620
May1st to 10thNight
15%3411%29%37%
1620
11th to 20thNight
11%2311%32%40%
1595
21st to endNight
14%3310%31%40%
1746
June1st to 10thNight
8%215%23%60%
1620
11th to 20thNight
8%216%15%67%
1620
21st to endNight
9%11413%73%
1620
July1st to 10thNight
13%237%12%63%
1575
11th to 20thNight
20%4411%21%41%
1566
21st to endNight
25%49%16%22%25%
1674
August1st to 10thNight
17%3311%21%46%
1602
11th to 20thNight
14%2413%22%45%
1638
21st to endNight
14%3311%24%45%
1980
September1st to 10thNight
14%3310%22%49%
1934
11th to 20thNight
10%237%23%55%
1980
21st to endNight
9%229%23%55%
1980
October1st to 10thNight
15%3312%24%44%
1980
11th to 20thNight
11%228%28%50%
2100
21st to endNight
11%1412%29%43%
2420
November1st to 10thNight
14%2315%36%31%
2405
11th to 20thNight
13%15%15%34%31%
2470
21st to endNight
18%1415%32%29%
2470
December1st to 10thNight
24%27%21%26%20%
2470
11th to 20thNight
29%37%21%31%9%
3041
21st to endNight
33%38%19%28%9%
4521

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
13%5%26%35%17%4
270
11th to 20thDay
11%5%19%39%22%3
246
21st to endDay
5%6%23%36%24%6%
264
February1st to 10thDay
7%9%25%34%20%4
380
11th to 20thDay
11%11%30%32%13%3
415
21st to endDay
10%15%27%38%11%
346
March1st to 10thDay
11%17%28%30%13%1
420
11th to 20thDay
9%12%26%37%13%3
420
21st to endDay
9%16%31%29%13%2
462
April1st to 10thDay
6%14%30%31%15%4
420
11th to 20thDay
6%22%28%28%13%2
412
21st to endDay
6%18%27%27%16%6%
420
May1st to 10thDay
315%33%30%14%5%
423
11th to 20thDay
313%32%29%17%5%
448
21st to endDay
413%29%33%15%5%
485
June1st to 10thDay
28%27%33%22%8%
450
11th to 20thDay
210%26%34%21%7%
450
21st to endDay
3427%39%22%5%
450
July1st to 10thDay
1318%43%26%9%
446
11th to 20thDay
3113%36%35%11%
444
21st to endDay
318%40%33%15%
487
August1st to 10thDay
2321%36%28%10%
447
11th to 20thDay
1318%35%27%14%
437
21st to endDay
3115%34%35%12%
495
September1st to 10thDay
3417%35%31%10%
450
11th to 20thDay
16%25%39%22%6%
450
21st to endDay
29%21%34%28%7%
450
October1st to 10thDay
47%26%31%24%7%
450
11th to 20thDay
37%20%34%29%6%
329
21st to endDay
37%19%33%31%7%
297
November1st to 10thDay
6%10%14%33%34%3
270
11th to 20thDay
4320%38%26%8%
270
21st to endDay
6%6%23%33%24%8%
270
December1st to 10thDay
5%419%41%27%4
270
11th to 20thDay
4221%40%24%7%
270
21st to endDay
17%9%19%35%18%3
297
January1st to 10thNight
10%219%39%22%8%
760
11th to 20thNight
7%217%42%24%7%
732
21st to endNight
9%320%39%21%7%
792
February1st to 10thNight
7%223%41%22%6%
720
11th to 20thNight
8%424%38%20%5%
704
21st to endNight
12%5%24%40%15%4
592
March1st to 10thNight
9%7%21%43%19%3
720
11th to 20thNight
9%420%36%25%6%
720
21st to endNight
6%7%24%40%20%3
792
April1st to 10thNight
5%8%22%43%20%3
720
11th to 20thNight
48%28%36%19%4
689
21st to endNight
6%9%19%40%21%5%
540
May1st to 10thNight
5%6%23%45%18%3
540
11th to 20thNight
26%19%38%31%4
531
21st to endNight
46%20%43%25%3
584
June1st to 10thNight
1318%45%29%4
540
11th to 20thNight
1421%40%31%3
540
21st to endNight
1314%44%32%5%
540
July1st to 10thNight
38%37%46%5%
525
11th to 20thNight
415%36%48%6%
522
21st to endNight
41331%55%5%
591
August1st to 10thNight
4110%38%43%4
537
11th to 20thNight
21439%48%5%
570
21st to endNight
316%32%46%12%
792
September1st to 10thNight
428%31%46%9%
720
11th to 20thNight
2210%41%35%11%
720
21st to endNight
1313%34%38%11%
720
October1st to 10thNight
4416%44%28%4
720
11th to 20thNight
2215%40%30%11%
720
21st to endNight
3417%35%32%10%
792
November1st to 10thNight
4313%41%31%8%
740
11th to 20thNight
4214%43%30%8%
760
21st to endNight
6%221%35%29%7%
760
December1st to 10thNight
9%218%40%24%7%
760
11th to 20thNight
9%317%41%26%4
760
21st to endNight
11%320%41%20%4
836
Page generated at 2024-01-10 07:16:10. Version ac07

Copyright 2024 Attilla Danko


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