Vasquez Rocks
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Vasquez Rocks clear sky chart from 2005-11-06 to 2024-01-12.

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
66%
24285
35%
74396
27%
24221
75%
24221
53%
34760

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
45%
760
28%
2646
20%
756
60%
756
35%
1332
January11th to 20thNight
44%
728
36%
2408
23%
728
63%
728
42%
1151
January21st to endNight
42%
792
37%
2407
21%
792
61%
792
37%
1252
February1st to 10thNight
49%
720
36%
2160
25%
720
64%
720
41%
1107
February11th to 20thNight
50%
700
34%
2098
22%
700
67%
700
46%
1057
February21st to endNight
50%
592
31%
1776
22%
592
62%
592
40%
925
March1st to 10thNight
48%
720
26%
2160
20%
720
59%
720
38%
1168
March11th to 20thNight
59%
720
26%
2101
22%
720
66%
720
45%
1088
March21st to endNight
59%
792
31%
1980
19%
792
66%
792
47%
1111
April1st to 10thNight
62%
720
33%
1800
19%
720
68%
720
51%
999
April11th to 20thNight
62%
711
36%
1779
18%
711
69%
711
59%
913
April21st to endNight
65%
720
33%
1800
16%
720
71%
720
65%
887
May1st to 10thNight
66%
662
32%
1742
20%
662
69%
662
58%
876
May11th to 20thNight
73%
531
37%
1595
29%
531
75%
531
62%
695
May21st to endNight
70%
582
33%
1746
24%
582
73%
582
67%
724
June1st to 10thNight
80%
464
34%
1544
32%
464
83%
464
65%
601
June11th to 20thNight
88%
360
41%
1440
46%
360
92%
360
76%
436
June21st to endNight
92%
360
42%
1440
50%
360
94%
360
78%
426
July1st to 10thNight
95%
350
40%
1400
48%
350
95%
350
77%
420
July11th to 20thNight
93%
348
40%
1392
46%
348
93%
348
66%
463
July21st to endNight
89%
729
36%
1805
27%
689
90%
689
70%
850
August1st to 10thNight
90%
716
37%
1780
24%
712
90%
712
77%
823
August11th to 20thNight
94%
712
42%
1780
26%
712
94%
712
86%
778
August21st to endNight
94%
792
46%
1980
31%
792
95%
792
83%
877
September1st to 10thNight
90%
720
45%
1800
35%
720
91%
720
81%
809
September11th to 20thNight
91%
720
47%
1921
42%
720
93%
720
83%
797
September21st to endNight
84%
720
46%
1980
40%
720
90%
720
80%
813
October1st to 10thNight
78%
720
40%
1980
35%
720
84%
720
66%
911
October11th to 20thNight
71%
720
43%
2114
38%
720
79%
720
64%
916
October21st to endNight
65%
792
43%
2410
36%
792
78%
792
60%
1050
November1st to 10thNight
65%
740
38%
2405
33%
740
77%
740
57%
1026
November11th to 20thNight
58%
760
39%
2470
29%
760
74%
760
55%
1055
November21st to endNight
52%
760
36%
2470
28%
760
67%
760
46%
1169
December1st to 10thNight
47%
760
34%
2470
23%
760
62%
760
40%
1238
December11th to 20thNight
45%
760
29%
2975
21%
759
62%
759
27%
1735
December21st to endNight
44%
832
20%
4642
21%
817
61%
817
21%
2282

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
3313323335%71%
74914
Night
3423323346%68%
74806
TransparencyDay
16%37%16%28%30%
74637
Night
17%47%15%27%30%
74604
SeeingDay
7%12%29%33%14%5%
14394
Night
6%6%17%36%29%6%
24295

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%5%24424447%56%
1519
11th to 20thDay
7%315%423346%63%
1586
21st to endDay
8%7%35%224336%58%
1944
February1st to 10thDay
6%5%24323345%64%
1800
11th to 20thDay
6%413323347%63%
1750
21st to endDay
6%7%25%42344460%
1480
March1st to 10thDay
7%5%26%5%445%5%6%52%
1800
11th to 20thDay
6%5%1442346%9%56%
1853
21st to endDay
44244245%46%60%
2376
April1st to 10thDay
5%423323447%64%
2160
11th to 20thDay
3323323345%72%
2129
21st to endDay
2322312348%70%
2160
May1st to 10thDay
3323323346%69%
2217
11th to 20thDay
2222223236%74%
2301
21st to endDay
2323212336%73%
2530
June1st to 10thDay
1212212236%76%
2410
11th to 20thDay
1211123484%
2520
21st to endDay
111111121386%
2520
July1st to 10thDay
111221222483%
2520
11th to 20thDay
211221123481%
2520
21st to endDay
2112212346%75%
2400
August1st to 10thDay
111111222482%
2149
11th to 20thDay
11111123387%
2122
21st to endDay
11121222485%
2376
September1st to 10thDay
211121222483%
2160
11th to 20thDay
11111122287%
2039
21st to endDay
11222222383%
1980
October1st to 10thDay
3112222345%75%
1980
11th to 20thDay
221221322380%
1842
21st to endDay
121221234477%
1944
November1st to 10thDay
221222334474%
1674
11th to 20thDay
2423323446%68%
1710
21st to endDay
442443335%7%62%
1710
December1st to 10thDay
5%425%424447%59%
1710
11th to 20thDay
8%7%26%5%45%5%5%8%45%
2169
21st to endDay
8%8%37%6%345%5%6%46%
2854
January1st to 10thNight
7%6%24423447%55%
2646
11th to 20thNight
5%5%1432335%7%62%
2408
21st to endNight
7%6%34323346%60%
2407
February1st to 10thNight
46%34423345%63%
2160
11th to 20thNight
5%5%24313345%64%
2098
21st to endNight
5%6%26%423445%59%
1776
March1st to 10thNight
48%345%25%5%5%8%51%
2160
11th to 20thNight
5%6%1332446%7%58%
2101
21st to endNight
5%6%2342345%7%60%
1980
April1st to 10thNight
46%24323347%63%
1800
11th to 20thNight
341322335%6%69%
1779
21st to endNight
3313322346%70%
1800
May1st to 10thNight
25%2332335%7%66%
1742
11th to 20thNight
2313322235%74%
1594
21st to endNight
1323222345%73%
1746
June1st to 10thNight
222313237%75%
1544
11th to 20thNight
11211223483%
1440
21st to endNight
11111112487%
1440
July1st to 10thNight
1211223484%
1440
11th to 20thNight
2111213245%79%
1440
21st to endNight
221222234475%
1911
August1st to 10thNight
21121223481%
1790
11th to 20thNight
1211112387%
1780
21st to endNight
11121223385%
1980
September1st to 10thNight
211111113483%
1800
11th to 20thNight
1121223385%
1921
21st to endNight
111111122484%
1980
October1st to 10thNight
221222233476%
1980
11th to 20thNight
232221213478%
2114
21st to endNight
2312312235%77%
2410
November1st to 10thNight
2412323346%71%
2405
11th to 20thNight
242332335%5%70%
2470
21st to endNight
4424324447%62%
2470
December1st to 10thNight
5%5%24424347%60%
2470
11th to 20thNight
8%8%35%5%345%6%8%46%
3041
21st to endNight
6%6%36%6%35%5%6%7%47%
4783

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
26%5%7%18%28%16%
1519
11th to 20thDay
23%38%15%30%21%
1586
21st to endDay
29%38%18%21%22%
1944
February1st to 10thDay
23%26%16%26%27%
1800
11th to 20thDay
22%36%16%32%22%
1760
21st to endDay
25%49%17%27%18%
1480
March1st to 10thDay
29%5%11%18%19%19%
1800
11th to 20thDay
24%5%10%19%24%18%
1853
21st to endDay
22%5%12%24%25%13%
2376
April1st to 10thDay
22%411%24%25%14%
2160
11th to 20thDay
15%410%20%32%18%
2132
21st to endDay
13%411%23%36%13%
2160
May1st to 10thDay
15%411%20%31%18%
2217
11th to 20thDay
12%310%23%35%17%
2304
21st to endDay
14%210%25%35%13%
2530
June1st to 10thDay
12%38%19%33%26%
2410
11th to 20thDay
5%37%13%30%43%
2520
21st to endDay
7%237%28%54%
2520
July1st to 10thDay
8%149%21%58%
2451
11th to 20thDay
10%2414%28%42%
2445
21st to endDay
10%37%17%31%32%
2266
August1st to 10thDay
8%148%24%55%
2135
11th to 20thDay
5%1210%34%48%
2122
21st to endDay
7%237%31%50%
2376
September1st to 10thDay
8%25%7%28%50%
2160
11th to 20thDay
5%15%10%31%48%
2039
21st to endDay
8%1410%37%40%
1980
October1st to 10thDay
13%27%15%24%39%
1980
11th to 20thDay
11%2412%29%41%
1842
21st to endDay
11%36%11%26%44%
1944
November1st to 10thDay
15%25%15%34%28%
1674
11th to 20thDay
18%36%14%25%35%
1710
21st to endDay
22%36%13%27%29%
1710
December1st to 10thDay
23%49%17%25%23%
1710
11th to 20thDay
34%7%10%16%21%12%
2168
21st to endDay
35%7%7%21%20%10%
2854
January1st to 10thNight
26%5%7%16%29%17%
2646
11th to 20thNight
21%5%7%16%29%23%
2408
21st to endNight
26%210%14%23%24%
2407
February1st to 10thNight
24%37%15%24%27%
2160
11th to 20thNight
22%38%14%28%25%
2099
21st to endNight
23%6%9%16%26%20%
1776
March1st to 10thNight
27%411%20%21%17%
2160
11th to 20thNight
22%5%13%15%26%19%
2101
21st to endNight
22%5%12%24%25%12%
1980
April1st to 10thNight
22%410%26%21%17%
1800
11th to 20thNight
14%5%9%26%26%20%
1779
21st to endNight
13%312%23%35%14%
1800
May1st to 10thNight
15%5%11%23%27%20%
1742
11th to 20thNight
13%39%22%37%17%
1595
21st to endNight
10%213%28%35%12%
1746
June1st to 10thNight
10%311%21%28%27%
1544
11th to 20thNight
5%37%16%28%43%
1440
21st to endNight
5%146%26%57%
1440
July1st to 10thNight
6%138%21%62%
1400
11th to 20thNight
9%26%13%26%45%
1392
21st to endNight
12%25%15%31%36%
1805
August1st to 10thNight
8%238%25%54%
1780
11th to 20thNight
5%138%32%52%
1780
21st to endNight
6%137%31%52%
1980
September1st to 10thNight
7%148%27%54%
1800
11th to 20thNight
5%248%33%47%
1921
21st to endNight
6%1311%36%42%
1980
October1st to 10thNight
13%25%13%28%39%
1980
11th to 20thNight
12%25%11%29%41%
2114
21st to endNight
13%3310%25%47%
2410
November1st to 10thNight
14%36%14%30%33%
2405
11th to 20thNight
16%27%12%28%36%
2470
21st to endNight
21%38%16%23%29%
2470
December1st to 10thNight
24%46%15%24%27%
2470
11th to 20thNight
29%12%10%14%23%14%
3041
21st to endNight
28%8%11%21%22%10%
4783

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
17%18%38%24%4
180
11th to 20thDay
14%20%34%26%5%1
298
21st to endDay
15%24%32%21%7%1
446
February1st to 10thDay
11%20%37%23%8%1
420
11th to 20thDay
14%21%36%22%6%1
415
21st to endDay
14%18%38%23%5%
346
March1st to 10thDay
16%22%35%21%6%
420
11th to 20thDay
12%21%33%25%8%1
420
21st to endDay
14%20%34%25%6%
462
April1st to 10thDay
11%15%34%25%14%1
420
11th to 20thDay
7%22%38%23%8%3
412
21st to endDay
6%19%35%24%11%5%
420
May1st to 10thDay
8%13%33%30%13%3
423
11th to 20thDay
5%12%32%34%11%6%
448
21st to endDay
6%11%34%29%14%5%
485
June1st to 10thDay
29%26%36%19%8%
450
11th to 20thDay
27%23%38%22%8%
450
21st to endDay
16%24%39%19%11%
450
July1st to 10thDay
1115%48%26%10%
446
11th to 20thDay
219%47%24%16%
444
21st to endDay
2112%45%24%16%
487
August1st to 10thDay
2221%47%18%11%
447
11th to 20thDay
2214%49%22%12%
437
21st to endDay
1120%45%22%11%
495
September1st to 10thDay
2223%45%22%6%
450
11th to 20thDay
15%29%41%19%3
450
21st to endDay
19%28%36%21%5%
450
October1st to 10thDay
211%36%33%16%3
450
11th to 20thDay
29%33%42%13%1
450
21st to endDay
412%32%34%15%2
459
November1st to 10thDay
6%10%34%31%14%3
270
11th to 20thDay
6%13%38%31%8%3
270
21st to endDay
10%13%41%27%9%1
270
December1st to 10thDay
11%14%42%25%8%
270
11th to 20thDay
7%17%37%31%7%1
270
21st to endDay
20%16%35%21%7%1
214
January1st to 10thNight
11%8%28%37%12%4
760
11th to 20thNight
7%11%33%34%14%1
728
21st to endNight
13%12%26%34%12%2
792
February1st to 10thNight
10%10%24%36%18%3
720
11th to 20thNight
8%8%29%33%17%4
704
21st to endNight
9%11%24%37%16%2
592
March1st to 10thNight
9%12%26%38%14%1
720
11th to 20thNight
10%5%21%35%23%6%
720
21st to endNight
8%7%20%43%19%2
792
April1st to 10thNight
7%6%18%41%24%3
720
11th to 20thNight
47%22%41%23%2
711
21st to endNight
46%22%38%26%5%
720
May1st to 10thNight
6%5%18%42%26%3
662
11th to 20thNight
45%15%37%37%3
531
21st to endNight
2419%41%31%3
584
June1st to 10thNight
1310%42%41%2
464
11th to 20thNight
27%42%44%5%
360
21st to endNight
1438%52%5%
360
July1st to 10thNight
128%64%7%
350
11th to 20thNight
122%69%8%
348
21st to endNight
21223%61%11%
729
August1st to 10thNight
2330%53%11%
716
11th to 20thNight
1121%61%15%
712
21st to endNight
1127%56%15%
792
September1st to 10thNight
21327%52%14%
720
11th to 20thNight
1440%42%12%
720
21st to endNight
129%40%38%10%
720
October1st to 10thNight
3212%50%29%4
720
11th to 20thNight
5%416%38%31%6%
720
21st to endNight
46%20%37%23%10%
792
November1st to 10thNight
45%21%41%23%5%
740
11th to 20thNight
5%426%40%19%6%
760
21st to endNight
7%7%29%37%18%3
760
December1st to 10thNight
9%9%29%37%14%3
760
11th to 20thNight
11%10%27%38%14%1
760
21st to endNight
10%13%26%38%11%2
836
Page generated at 2024-01-09 13:24:26. Version ac07

Copyright 2024 Attilla Danko


Vasquez Rocks Clear Sky Chart |Charts Home