LAAS -- Boy Scout Camp Road
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the LAAS -- Boy Scout Camp Road clear sky chart from 2005-11-06 to 2024-01-15.

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
65%
24187
35%
74566
28%
24133
74%
24133
52%
34941

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
48%
756
28%
2637
22%
756
60%
756
33%
1359
January11th to 20thNight
49%
736
34%
2392
23%
736
65%
736
42%
1175
January21st to endNight
42%
792
34%
2524
22%
792
59%
792
35%
1320
February1st to 10thNight
48%
720
33%
2160
24%
720
60%
720
40%
1127
February11th to 20thNight
51%
700
34%
2098
25%
700
65%
700
45%
1028
February21st to endNight
48%
592
31%
1776
25%
592
59%
592
38%
947
March1st to 10thNight
48%
720
25%
2160
19%
720
58%
720
34%
1202
March11th to 20thNight
52%
720
26%
2048
21%
720
60%
720
40%
1117
March21st to endNight
53%
792
31%
2006
18%
792
62%
792
46%
1102
April1st to 10thNight
50%
720
32%
1800
15%
720
59%
720
48%
999
April11th to 20thNight
55%
711
36%
1779
17%
711
64%
711
59%
885
April21st to endNight
58%
720
34%
1800
15%
720
66%
720
64%
873
May1st to 10thNight
63%
716
32%
1796
15%
716
69%
716
65%
874
May11th to 20thNight
68%
531
39%
1595
27%
531
73%
531
64%
664
May21st to endNight
63%
566
33%
1730
21%
566
71%
566
62%
722
June1st to 10thNight
76%
360
38%
1440
40%
360
83%
360
60%
505
June11th to 20thNight
86%
360
42%
1440
46%
360
92%
360
78%
429
June21st to endNight
88%
360
45%
1440
50%
360
94%
360
83%
412
July1st to 10thNight
95%
350
38%
1400
45%
350
96%
350
73%
441
July11th to 20thNight
93%
381
41%
1425
45%
381
93%
381
71%
483
July21st to endNight
91%
663
39%
1742
31%
626
92%
626
73%
761
August1st to 10thNight
90%
716
38%
1780
25%
712
90%
712
78%
814
August11th to 20thNight
95%
712
42%
1780
25%
712
96%
712
85%
781
August21st to endNight
94%
792
46%
1980
31%
792
94%
792
83%
871
September1st to 10thNight
89%
720
47%
1800
35%
720
90%
720
82%
805
September11th to 20thNight
91%
720
49%
1879
41%
720
94%
720
85%
794
September21st to endNight
83%
720
47%
1980
41%
720
90%
720
81%
815
October1st to 10thNight
77%
720
39%
2011
35%
720
83%
720
67%
902
October11th to 20thNight
71%
720
42%
2160
38%
720
81%
720
65%
908
October21st to endNight
68%
792
44%
2376
38%
792
80%
792
64%
999
November1st to 10thNight
67%
740
37%
2388
35%
740
75%
740
55%
1018
November11th to 20thNight
64%
760
37%
2470
31%
760
75%
760
53%
1086
November21st to endNight
54%
760
34%
2470
29%
760
66%
760
44%
1184
December1st to 10thNight
52%
760
32%
2470
26%
760
63%
760
40%
1243
December11th to 20thNight
51%
760
26%
3114
26%
759
62%
759
23%
1882
December21st to endNight
47%
829
19%
4720
24%
817
59%
817
20%
2414

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
3423323346%67%
74801
Night
3324323446%65%
74973
TransparencyDay
17%45%16%30%28%
74521
Night
17%45%17%30%28%
74774
SeeingDay
8%11%27%33%16%5%
14389
Night
6%6%18%34%30%7%
24204

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
6%5%37%5%3445%8%50%
1523
11th to 20thDay
5%5%25%423448%58%
1657
21st to endDay
6%9%37%433446%51%
1828
February1st to 10thDay
5%7%35%424446%58%
1800
11th to 20thDay
47%36%32346%7%55%
1750
21st to endDay
5%6%46%424345%56%
1480
March1st to 10thDay
49%36%6%35%5%5%7%46%
1800
11th to 20thDay
38%44435%5%5%10%51%
1908
21st to endDay
45%35%43445%7%57%
2348
April1st to 10thDay
5%5%35%32435%8%56%
2160
11th to 20thDay
3425%323346%66%
2129
21st to endDay
331322345%7%68%
2160
May1st to 10thDay
3323323347%67%
2160
11th to 20thDay
2312323347%70%
2301
21st to endDay
3323323346%68%
2540
June1st to 10thDay
1213223447%71%
2520
11th to 20thDay
11111223485%
2520
21st to endDay
111111222485%
2520
July1st to 10thDay
11122233480%
2520
11th to 20thDay
221221235%5%74%
2483
21st to endDay
2212223347%72%
2470
August1st to 10thDay
121222233478%
2149
11th to 20thDay
111112235%83%
2122
21st to endDay
111221223480%
2376
September1st to 10thDay
11221324480%
2160
11th to 20thDay
11111123386%
2080
21st to endDay
111221223382%
1980
October1st to 10thDay
3313224235%73%
1945
11th to 20thDay
1212223225%78%
1800
21st to endDay
1313212346%74%
1980
November1st to 10thDay
2323323346%69%
1688
11th to 20thDay
23243235%5%5%67%
1710
21st to endDay
3435%43445%6%58%
1710
December1st to 10thDay
35%35%4345%6%7%55%
1710
11th to 20thDay
6%9%36%5%35%5%6%9%43%
2020
21st to endDay
5%10%47%7%45%5%47%43%
2794
January1st to 10thNight
46%35%5%35%5%6%9%49%
2637
11th to 20thNight
35%35%4345%6%8%56%
2392
21st to endNight
6%6%37%5%3445%6%52%
2524
February1st to 10thNight
46%37%424446%56%
2160
11th to 20thNight
4435%4245%5%6%58%
2098
21st to endNight
4437%5%3445%7%54%
1776
March1st to 10thNight
46%37%6%46%5%6%10%43%
2160
11th to 20thNight
26%37%6%445%5%8%49%
2048
21st to endNight
3436%6%35%5%5%8%54%
2006
April1st to 10thNight
35%35%4245%6%8%56%
1800
11th to 20thNight
2325%423447%65%
1779
21st to endNight
212422335%8%68%
1800
May1st to 10thNight
2214323347%69%
1796
11th to 20thNight
2223212245%75%
1594
21st to endNight
2213223236%74%
1730
June1st to 10thNight
1113212345%75%
1440
11th to 20thNight
1111122487%
1440
21st to endNight
11111111390%
1440
July1st to 10thNight
111121223384%
1440
11th to 20thNight
111112223482%
1473
21st to endNight
111222233480%
1845
August1st to 10thNight
211111233482%
1790
11th to 20thNight
1111213387%
1780
21st to endNight
111111112387%
1980
September1st to 10thNight
11211112387%
1800
11th to 20thNight
1111122487%
1879
21st to endNight
111223484%
1980
October1st to 10thNight
1212223345%75%
2011
11th to 20thNight
1213323446%73%
2160
21st to endNight
1213213335%75%
2376
November1st to 10thNight
1226%42345%8%64%
2388
11th to 20thNight
2324424447%64%
2470
21st to endNight
2336%435%45%7%57%
2470
December1st to 10thNight
45%25%5%2446%9%55%
2470
11th to 20thNight
6%9%48%6%35%5%6%7%40%
3179
21st to endNight
6%9%27%6%45%6%6%8%43%
4862

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
28%5%6%18%28%15%
1523
11th to 20thDay
25%37%14%30%21%
1657
21st to endDay
30%46%17%24%19%
1828
February1st to 10thDay
25%4319%28%23%
1800
11th to 20thDay
22%5%5%18%30%20%
1760
21st to endDay
28%45%19%29%15%
1480
March1st to 10thDay
30%5%9%20%21%15%
1800
11th to 20thDay
26%6%8%20%24%15%
1908
21st to endDay
23%5%10%25%25%11%
2348
April1st to 10thDay
22%5%9%25%25%13%
2160
11th to 20thDay
17%47%26%31%15%
2132
21st to endDay
13%5%9%25%37%11%
2160
May1st to 10thDay
16%47%21%36%14%
2160
11th to 20thDay
13%37%23%37%16%
2304
21st to endDay
16%46%28%34%12%
2540
June1st to 10thDay
13%47%19%32%26%
2520
11th to 20thDay
6%35%15%33%40%
2520
21st to endDay
6%227%29%54%
2520
July1st to 10thDay
7%237%23%59%
2451
11th to 20thDay
11%3415%30%38%
2408
21st to endDay
11%36%17%32%31%
2333
August1st to 10thDay
10%337%27%51%
2135
11th to 20thDay
6%1211%31%48%
2122
21st to endDay
9%227%34%46%
2376
September1st to 10thDay
7%338%28%50%
2160
11th to 20thDay
5%2211%33%47%
2080
21st to endDay
9%2211%40%36%
1980
October1st to 10thDay
13%3415%26%37%
1945
11th to 20thDay
11%3313%34%37%
1800
21st to endDay
12%4411%31%38%
1980
November1st to 10thDay
14%3318%35%27%
1688
11th to 20thDay
16%45%15%31%29%
1710
21st to endDay
23%46%14%27%27%
1710
December1st to 10thDay
25%5%6%15%28%21%
1710
11th to 20thDay
35%6%6%19%21%13%
2019
21st to endDay
36%6%6%18%23%12%
2794
January1st to 10thNight
27%5%5%16%29%17%
2637
11th to 20thNight
21%5%7%15%31%21%
2392
21st to endNight
26%5%6%15%23%26%
2524
February1st to 10thNight
23%6%5%16%25%26%
2160
11th to 20thNight
20%45%18%32%21%
2099
21st to endNight
24%6%5%19%28%18%
1776
March1st to 10thNight
28%6%7%21%22%16%
2160
11th to 20thNight
24%6%9%19%25%17%
2048
21st to endNight
20%5%9%26%28%11%
2006
April1st to 10thNight
22%5%10%26%24%14%
1800
11th to 20thNight
13%39%26%31%18%
1779
21st to endNight
10%49%29%38%11%
1800
May1st to 10thNight
11%311%23%38%13%
1796
11th to 20thNight
10%25%28%38%16%
1595
21st to endNight
11%29%29%38%10%
1730
June1st to 10thNight
10%38%22%35%23%
1440
11th to 20thNight
425%15%33%41%
1440
21st to endNight
4128%29%57%
1440
July1st to 10thNight
7%227%24%58%
1400
11th to 20thNight
7%3416%30%40%
1425
21st to endNight
9%35%18%30%35%
1742
August1st to 10thNight
7%329%29%51%
1780
11th to 20thNight
5%2210%31%50%
1780
21st to endNight
6%118%33%51%
1980
September1st to 10thNight
6%228%29%54%
1800
11th to 20thNight
5%2211%36%45%
1879
21st to endNight
5%2213%39%40%
1980
October1st to 10thNight
11%3315%30%38%
2011
11th to 20thNight
11%3315%31%38%
2160
21st to endNight
10%35%10%33%40%
2376
November1st to 10thNight
13%4415%35%28%
2388
11th to 20thNight
15%45%14%29%33%
2470
21st to endNight
20%46%17%25%28%
2470
December1st to 10thNight
23%5%6%13%27%26%
2470
11th to 20thNight
38%5%7%14%22%15%
3179
21st to endNight
31%7%5%18%26%12%
4862

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
19%19%31%22%8%1
184
11th to 20thDay
19%17%30%25%7%1
353
21st to endDay
17%22%31%18%9%2
395
February1st to 10thDay
12%16%35%25%8%3
420
11th to 20thDay
20%18%31%22%8%1
415
21st to endDay
17%19%34%23%6%1
346
March1st to 10thDay
15%22%33%23%5%1
420
11th to 20thDay
16%20%30%25%7%1
420
21st to endDay
15%21%34%24%7%
462
April1st to 10thDay
15%13%34%25%12%1
420
11th to 20thDay
14%17%32%26%10%1
412
21st to endDay
8%15%30%28%14%5%
420
May1st to 10thDay
12%14%32%27%13%3
423
11th to 20thDay
8%12%31%31%13%5%
448
21st to endDay
11%10%27%33%14%6%
485
June1st to 10thDay
5%8%26%33%21%7%
450
11th to 20thDay
26%25%39%21%8%
450
21st to endDay
26%26%37%19%10%
450
July1st to 10thDay
2115%45%25%12%
446
11th to 20thDay
3110%43%27%16%
444
21st to endDay
2112%43%28%15%
487
August1st to 10thDay
2120%43%21%13%
447
11th to 20thDay
2214%43%31%9%
437
21st to endDay
1115%49%23%10%
495
September1st to 10thDay
2323%44%22%6%
450
11th to 20thDay
6%30%45%17%2
450
21st to endDay
18%27%42%17%4
450
October1st to 10thDay
49%32%36%17%2
450
11th to 20thDay
49%36%35%14%3
450
21st to endDay
5%11%31%36%14%3
495
November1st to 10thDay
7%11%29%31%19%3
284
11th to 20thDay
8%11%29%34%15%4
270
21st to endDay
10%14%32%27%13%3
270
December1st to 10thDay
8%13%34%30%13%1
270
11th to 20thDay
12%17%24%27%16%4
223
21st to endDay
18%25%24%21%10%3
198
January1st to 10thNight
12%9%24%30%17%7%
760
11th to 20thNight
8%8%29%34%16%5%
736
21st to endNight
12%12%28%29%14%5%
792
February1st to 10thNight
10%9%25%32%18%6%
720
11th to 20thNight
10%9%26%30%16%9%
704
21st to endNight
10%13%24%34%16%4
592
March1st to 10thNight
9%13%24%34%18%2
720
11th to 20thNight
8%9%23%33%23%5%
720
21st to endNight
8%12%21%35%21%3
792
April1st to 10thNight
7%9%27%35%18%4
720
11th to 20thNight
7%8%24%34%24%3
711
21st to endNight
5%8%25%31%23%7%
720
May1st to 10thNight
5%6%23%35%27%5%
716
11th to 20thNight
5%7%16%35%34%4
531
21st to endNight
5%6%21%32%32%5%
568
June1st to 10thNight
3413%39%36%6%
360
11th to 20thNight
111%43%38%7%
360
21st to endNight
118%41%43%7%
360
July1st to 10thNight
1130%58%11%
350
11th to 20thNight
2127%56%14%
381
21st to endNight
2222%55%18%
663
August1st to 10thNight
2431%52%10%
716
11th to 20thNight
227%57%13%
712
21st to endNight
2128%55%14%
792
September1st to 10thNight
126%28%50%14%
720
11th to 20thNight
17%44%38%10%
720
21st to endNight
1212%36%41%9%
720
October1st to 10thNight
2215%44%32%5%
720
11th to 20thNight
3418%37%30%9%
720
21st to endNight
36%19%32%30%10%
792
November1st to 10thNight
39%17%38%24%9%
740
11th to 20thNight
5%421%38%24%8%
760
21st to endNight
6%8%26%31%23%6%
760
December1st to 10thNight
8%9%25%33%21%4
760
11th to 20thNight
12%10%20%38%15%5%
760
21st to endNight
12%11%23%33%15%6%
836
Page generated at 2024-01-11 19:33:47. Version ac07

Copyright 2024 Attilla Danko


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