Vekol Road
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Vekol Road clear sky chart from 2005-11-06 to 2024-02-20.

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
75%
24281
38%
79244
33%
24211
81%
24211
54%
35561

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
74%
748
41%
3974
34%
736
79%
736
36%
1472
January11th to 20thNight
73%
747
48%
3876
38%
740
80%
740
46%
1236
January21st to endNight
63%
826
26%
4217
34%
814
73%
814
31%
1910
February1st to 10thNight
67%
760
39%
2335
35%
760
76%
760
52%
1095
February11th to 20thNight
64%
738
38%
2212
32%
738
75%
738
50%
1098
February21st to endNight
61%
592
37%
1775
31%
592
71%
592
48%
859
March1st to 10thNight
59%
720
38%
1980
27%
720
71%
720
53%
1005
March11th to 20thNight
70%
720
42%
1980
32%
720
79%
720
60%
952
March21st to endNight
68%
792
40%
2178
27%
792
78%
792
58%
1052
April1st to 10thNight
66%
720
37%
1980
23%
720
76%
720
60%
943
April11th to 20thNight
61%
644
40%
1888
25%
644
74%
644
64%
816
April21st to endNight
68%
540
49%
1630
35%
540
80%
540
71%
654
May1st to 10thNight
71%
540
44%
1620
32%
540
80%
540
68%
655
May11th to 20thNight
74%
531
42%
1594
32%
531
80%
531
68%
659
May21st to endNight
72%
582
43%
1746
32%
582
78%
582
79%
665
June1st to 10thNight
83%
540
38%
1620
31%
540
85%
540
71%
657
June11th to 20thNight
85%
540
40%
1620
32%
540
89%
540
82%
611
June21st to endNight
85%
540
34%
1620
29%
540
87%
540
65%
709
July1st to 10thNight
84%
525
28%
1575
22%
525
85%
525
51%
785
July11th to 20thNight
84%
522
28%
1566
23%
522
84%
522
44%
823
July21st to endNight
80%
591
28%
1674
24%
558
80%
558
40%
922
August1st to 10thNight
89%
537
32%
1602
27%
534
89%
534
53%
764
August11th to 20thNight
83%
534
35%
1602
32%
534
83%
534
49%
802
August21st to endNight
85%
762
34%
2058
28%
762
85%
762
55%
1069
September1st to 10thNight
81%
720
34%
1980
30%
720
83%
720
53%
1016
September11th to 20thNight
87%
720
43%
1980
38%
720
89%
720
68%
895
September21st to endNight
83%
720
43%
1980
34%
720
87%
720
68%
902
October1st to 10thNight
78%
720
43%
1984
33%
720
84%
720
65%
928
October11th to 20thNight
85%
720
46%
2160
40%
720
90%
720
75%
857
October21st to endNight
81%
792
46%
2376
38%
792
89%
792
71%
959
November1st to 10thNight
81%
740
43%
2220
41%
740
85%
740
61%
1003
November11th to 20thNight
81%
760
42%
2431
42%
760
85%
760
62%
1026
November21st to endNight
70%
760
39%
2470
37%
760
78%
760
51%
1134
December1st to 10thNight
75%
760
39%
2470
39%
760
79%
760
48%
1166
December11th to 20thNight
69%
758
35%
2932
38%
758
75%
758
36%
1524
December21st to endNight
67%
820
25%
4339
37%
817
73%
817
30%
1938

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
3213323446%68%
78862
Night
3213323346%69%
80402
TransparencyDay
18%3312%25%39%
78589
Night
17%3312%26%39%
80197
SeeingDay
4417%31%29%15%
14063
Night
4313%39%35%7%
24340

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
3334423345%66%
2858
11th to 20thDay
3313424345%67%
2860
21st to endDay
6%4244245%6%8%55%
3146
February1st to 10thDay
222342335%6%67%
1843
11th to 20thDay
5%424323345%64%
1841
21st to endDay
5%323224346%67%
1480
March1st to 10thDay
432332446%6%64%
1980
11th to 20thDay
2223323446%67%
1980
21st to endDay
221332334472%
2178
April1st to 10thDay
111232335%7%73%
1980
11th to 20thDay
2211212235%78%
2018
21st to endDay
1111211336%81%
2326
May1st to 10thDay
1112222335%78%
2340
11th to 20thDay
1112212235%80%
2301
21st to endDay
111111211387%
2530
June1st to 10thDay
211212226%81%
2340
11th to 20thDay
11111112289%
2340
21st to endDay
111221333479%
2340
July1st to 10thDay
231343445%7%65%
2340
11th to 20thDay
33145%46%6%8%11%48%
2340
21st to endDay
5%436%6%47%6%8%11%39%
2545
August1st to 10thDay
32245%36%6%6%7%56%
2328
11th to 20thDay
2314345%6%7%11%55%
2299
21st to endDay
33144345%6%9%58%
2294
September1st to 10thDay
431343345%6%65%
1980
11th to 20thDay
312222245%76%
1980
21st to endDay
2212323345%73%
1980
October1st to 10thDay
3112223345%74%
1975
11th to 20thDay
11111123485%
1800
21st to endDay
1112222435%78%
1980
November1st to 10thDay
1112213238%75%
1859
11th to 20thDay
231331234474%
1746
21st to endDay
4313313346%67%
1710
December1st to 10thDay
5%41442445%7%60%
1710
11th to 20thDay
45%25%5%2447%7%56%
2169
21st to endDay
7%3244245%6%7%55%
3146
January1st to 10thNight
331432345%6%66%
4097
11th to 20thNight
2212212346%74%
4110
21st to endNight
9%42332345%7%59%
4521
February1st to 10thNight
4313323347%67%
2335
11th to 20thNight
4323323346%65%
2211
21st to endNight
431343245%5%66%
1775
March1st to 10thNight
421323435%6%65%
1980
11th to 20thNight
4212213345%72%
1980
21st to endNight
321322345%6%69%
2178
April1st to 10thNight
2123313445%72%
1980
11th to 20thNight
22221222381%
1888
21st to endNight
211111223483%
1630
May1st to 10thNight
1211112346%78%
1620
11th to 20thNight
111121233480%
1594
21st to endNight
21111111389%
1746
June1st to 10thNight
1112212236%79%
1620
11th to 20thNight
11122388%
1620
21st to endNight
221221333477%
1620
July1st to 10thNight
3213435%47%7%61%
1620
11th to 20thNight
2214436%7%9%13%50%
1620
21st to endNight
3326%5%36%6%9%15%42%
1773
August1st to 10thNight
1213335%5%7%10%60%
1611
11th to 20thNight
22146%345%6%10%57%
1602
21st to endNight
232342446%9%61%
2058
September1st to 10thNight
321443345%8%62%
1980
11th to 20thNight
221221234478%
1980
21st to endNight
2212212345%77%
1980
October1st to 10thNight
2113322335%75%
1984
11th to 20thNight
121112235%82%
2160
21st to endNight
111212225%82%
2376
November1st to 10thNight
2212224345%74%
2220
11th to 20thNight
2213322245%75%
2431
21st to endNight
4213423346%67%
2470
December1st to 10thNight
5%21233446%7%64%
2470
11th to 20thNight
6%5%35%42445%7%56%
3041
21st to endNight
5%3245%34445%60%
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
21%3214%34%27%
2859
11th to 20thDay
21%2216%40%19%
2860
21st to endDay
27%36%17%29%18%
3146
February1st to 10thDay
18%2412%26%37%
1843
11th to 20thDay
23%3212%28%32%
1851
21st to endDay
19%2113%32%33%
1480
March1st to 10thDay
21%319%31%35%
1980
11th to 20thDay
19%3111%27%39%
1980
21st to endDay
17%327%33%38%
2178
April1st to 10thDay
12%217%36%42%
1980
11th to 20thDay
11%26%27%54%
2021
21st to endDay
7%217%25%57%
2326
May1st to 10thDay
11%216%21%58%
2340
11th to 20thDay
10%216%24%56%
2304
21st to endDay
6%2422%66%
2530
June1st to 10thDay
9%2319%67%
2340
11th to 20thDay
6%1111%80%
2340
21st to endDay
11%315%14%66%
2340
July1st to 10thDay
20%3411%19%43%
2276
11th to 20thDay
27%6%10%24%20%13%
2271
21st to endDay
36%5%11%23%16%9%
2404
August1st to 10thDay
24%5%7%17%18%28%
2313
11th to 20thDay
22%5%8%20%22%22%
2299
21st to endDay
22%5%6%17%27%22%
2294
September1st to 10thDay
22%35%14%26%31%
1980
11th to 20thDay
13%219%27%48%
1980
21st to endDay
14%327%23%51%
1980
October1st to 10thDay
13%3212%25%45%
1975
11th to 20thDay
7%217%25%59%
1800
21st to endDay
11%327%25%52%
1980
November1st to 10thDay
10%3112%30%45%
1859
11th to 20thDay
16%219%27%44%
1746
21st to endDay
19%2211%29%37%
1710
December1st to 10thDay
23%4314%24%32%
1710
11th to 20thDay
27%2418%27%21%
2168
21st to endDay
27%4421%28%16%
3146
January1st to 10thNight
19%3211%36%28%
4097
11th to 20thNight
15%1219%41%21%
4110
21st to endNight
27%27%16%31%18%
4521
February1st to 10thNight
19%2413%22%41%
2335
11th to 20thNight
22%2314%27%32%
2212
21st to endNight
21%3212%27%35%
1775
March1st to 10thNight
20%3111%28%37%
1980
11th to 20thNight
16%2111%25%46%
1980
21st to endNight
16%329%34%36%
2178
April1st to 10thNight
14%418%27%46%
1980
11th to 20thNight
12%216%26%54%
1888
21st to endNight
9%217%23%58%
1630
May1st to 10thNight
9%218%23%57%
1620
11th to 20thNight
10%216%21%60%
1595
21st to endNight
7%1420%69%
1746
June1st to 10thNight
9%2218%69%
1620
11th to 20thNight
421112%80%
1620
21st to endNight
13%22311%69%
1620
July1st to 10thNight
20%46%11%16%43%
1575
11th to 20thNight
22%7%10%24%24%13%
1566
21st to endNight
28%5%14%23%20%11%
1674
August1st to 10thNight
18%48%21%18%31%
1602
11th to 20thNight
22%310%19%23%22%
1602
21st to endNight
20%48%16%27%25%
2058
September1st to 10thNight
20%37%17%20%32%
1980
11th to 20thNight
11%328%24%51%
1980
21st to endNight
12%229%24%52%
1980
October1st to 10thNight
14%2212%22%47%
1984
11th to 20thNight
8%219%22%58%
2160
21st to endNight
9%228%22%57%
2376
November1st to 10thNight
14%318%29%45%
2220
11th to 20thNight
14%2110%27%46%
2431
21st to endNight
19%3212%28%37%
2470
December1st to 10thNight
21%3316%23%34%
2470
11th to 20thNight
28%3313%28%25%
3041
21st to endNight
27%3319%27%21%
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
6%323%40%23%4
270
11th to 20thDay
9%316%36%28%7%
270
21st to endDay
3424%38%23%7%
297
February1st to 10thDay
5%5%26%37%22%6%
403
11th to 20thDay
9%12%25%31%21%2
452
21st to endDay
8%11%34%33%13%2
346
March1st to 10thDay
5%11%28%35%19%3
420
11th to 20thDay
49%25%31%23%8%
420
21st to endDay
5%11%30%31%20%3
462
April1st to 10thDay
37%26%32%21%10%
420
11th to 20thDay
38%28%34%20%8%
412
21st to endDay
29%23%33%20%13%
420
May1st to 10thDay
26%22%35%21%13%
423
11th to 20thDay
2322%34%27%13%
448
21st to endDay
15%24%33%27%11%
485
June1st to 10thDay
3117%34%31%13%
450
11th to 20thDay
2216%36%28%16%
450
21st to endDay
2111%34%33%19%
450
July1st to 10thDay
26%29%37%25%
446
11th to 20thDay
31121%38%35%
444
21st to endDay
6%2216%36%39%
487
August1st to 10thDay
31219%42%33%
447
11th to 20thDay
21319%40%35%
437
21st to endDay
21216%43%36%
495
September1st to 10thDay
419%26%38%22%
450
11th to 20thDay
417%31%42%15%
450
21st to endDay
3319%27%28%20%
450
October1st to 10thDay
3416%36%31%11%
445
11th to 20thDay
311%34%39%13%
270
21st to endDay
2215%31%37%13%
297
November1st to 10thDay
25%14%36%36%7%
270
11th to 20thDay
4411%38%37%6%
270
21st to endDay
4421%38%24%8%
270
December1st to 10thDay
7%111%45%31%5%
270
11th to 20thDay
4319%40%30%4
270
21st to endDay
11%422%39%20%3
297
January1st to 10thNight
4212%47%30%6%
760
11th to 20thNight
6%212%43%31%6%
760
21st to endNight
9%218%42%24%5%
836
February1st to 10thNight
5%417%40%29%5%
760
11th to 20thNight
6%420%44%24%3
742
21st to endNight
5%7%20%44%20%4
592
March1st to 10thNight
5%5%26%40%22%3
720
11th to 20thNight
5%418%35%29%9%
720
21st to endNight
46%18%41%26%5%
792
April1st to 10thNight
35%22%41%25%4
720
11th to 20thNight
35%27%40%22%3
644
21st to endNight
2424%44%22%4
540
May1st to 10thNight
25%19%47%25%2
540
11th to 20thNight
2317%44%31%4
531
21st to endNight
2221%43%28%3
584
June1st to 10thNight
1210%54%30%2
540
11th to 20thNight
1113%52%32%2
540
21st to endNight
216%44%43%4
540
July1st to 10thNight
315%38%45%7%
525
11th to 20thNight
31230%54%9%
522
21st to endNight
4226%55%12%
591
August1st to 10thNight
2124%58%14%
537
11th to 20thNight
31326%57%10%
534
21st to endNight
31317%59%18%
762
September1st to 10thNight
415%26%54%10%
720
11th to 20thNight
25%32%50%10%
720
21st to endNight
3110%37%41%10%
720
October1st to 10thNight
2213%40%36%7%
720
11th to 20thNight
2110%41%40%7%
720
21st to endNight
2310%38%37%11%
792
November1st to 10thNight
329%43%36%8%
740
11th to 20thNight
3110%40%40%6%
760
21st to endNight
5%215%39%32%7%
760
December1st to 10thNight
6%210%44%32%5%
760
11th to 20thNight
8%412%46%27%3
760
21st to endNight
6%314%46%27%5%
836
Page generated at 2024-02-17 04:28:41. Version ac07

Copyright 2024 Attilla Danko


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