Cuesta College - North County Campus
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cuesta College - North County Campus clear sky chart from 2005-11-05 to 2017-10-06.

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%
15680
33%
47115
29%
15643
79%
15643
52%
22972

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 15thNight
65%
716
24%
2386
24%
716
69%
716
36%
1278
January16th to endNight
66%
768
27%
2496
28%
768
69%
768
36%
1381
February1st to 15thNight
69%
698
29%
2194
29%
697
72%
697
37%
1214
February16th to endNight
63%
632
26%
1895
27%
632
67%
632
37%
1083
March1st to 15thNight
70%
720
23%
2061
21%
720
74%
720
44%
1138
March16th to endNight
67%
768
26%
2048
20%
768
72%
768
46%
1144
April1st to 15thNight
61%
719
31%
1799
18%
719
65%
719
48%
1016
April16th to endNight
63%
720
32%
1800
14%
720
69%
720
59%
927
May1st to 15thNight
76%
719
30%
1799
18%
719
78%
719
65%
900
May16th to endNight
68%
413
35%
1536
30%
413
77%
413
57%
587
June1st to 15thNight
81%
360
35%
1440
38%
360
88%
360
61%
506
June16th to endNight
92%
360
42%
1440
51%
360
94%
360
82%
413
July1st to 15thNight
96%
373
36%
1393
42%
373
97%
373
79%
442
July16th to endNight
94%
564
40%
1593
36%
531
94%
531
73%
643
August1st to 15thNight
93%
654
40%
1728
28%
651
93%
651
78%
751
August16th to endNight
94%
764
45%
1910
30%
764
94%
764
81%
857
September1st to 15thNight
92%
720
44%
1800
34%
720
93%
720
75%
845
September16th to endNight
89%
716
49%
1921
44%
716
92%
716
78%
822
October1st to 15thNight
79%
684
33%
2052
36%
684
82%
684
55%
966
October16th to endNight
79%
704
39%
2112
41%
704
83%
704
54%
1010
November1st to 15thNight
78%
700
36%
2209
37%
700
82%
700
54%
1015
November16th to endNight
74%
720
30%
2340
30%
720
79%
720
45%
1156
December1st to 15thNight
67%
720
28%
2475
29%
720
72%
720
33%
1361
December16th to endNight
58%
768
25%
2688
24%
768
65%
768
30%
1517

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
3312213336%67%
48073
Night
4212213336%67%
47305
TransparencyDay
19%27%18%28%22%
47760
Night
20%28%19%27%21%
47118
SeeingDay
5%5%16%32%28%11%
6102
Night
5%211%33%38%8%
15692

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 15thDay
5%5%13435%5%5%6%53%
1549
16th to endDay
11%5%14433337%50%
1728
February1st to 15thDay
9%5%26%313326%52%
1665
16th to endDay
12%6%3442445%6%46%
1579
March1st to 15thDay
4424435%5%6%9%49%
1896
16th to endDay
7%4244345%47%52%
2175
April1st to 15thDay
7%434323347%54%
2149
16th to endDay
4312213447%63%
2160
May1st to 15thDay
1212213247%70%
2151
16th to endDay
2212212136%74%
2572
June1st to 15thDay
1111213236%74%
2520
16th to endDay
1112388%
2520
July1st to 15thDay
111123482%
2481
16th to endDay
11112345%78%
2468
August1st to 15thDay
121122481%
2220
16th to endDay
1111112482%
2292
September1st to 15thDay
111113482%
2160
16th to endDay
1111123479%
2037
October1st to 15thDay
321221335%6%66%
1705
16th to endDay
1212313345%69%
1760
November1st to 15thDay
5%323333335%62%
1648
16th to endDay
3324413346%60%
1620
December1st to 15thDay
8%5%36%6%2335%6%49%
1482
16th to endDay
10%5%25%41335%6%50%
1536
January1st to 15thNight
6%4245%3345%7%52%
2386
16th to endNight
8%424224445%54%
2496
February1st to 15thNight
6%5%23425%447%54%
2185
16th to endNight
9%4235%23336%54%
1895
March1st to 15thNight
4413324447%58%
2061
16th to endNight
5%21432345%8%57%
2048
April1st to 15thNight
5%312313337%62%
1799
16th to endNight
3212212337%70%
1800
May1st to 15thNight
111222247%71%
1799
16th to endNight
1211212235%75%
1535
June1st to 15thNight
111212335%76%
1440
16th to endNight
12389%
1440
July1st to 15thNight
11112484%
1476
16th to endNight
111111235%80%
1701
August1st to 15thNight
111112383%
1737
16th to endNight
111112484%
1910
September1st to 15thNight
1111122481%
1800
16th to endNight
1112484%
1921
October1st to 15thNight
2322212235%70%
2052
16th to endNight
3212212346%68%
2112
November1st to 15thNight
3213212245%69%
2209
16th to endNight
331331435%7%61%
2340
December1st to 15thNight
7%42442345%7%52%
2475
16th to endNight
9%5%25%424336%51%
2688

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 15thDay
30%48%22%22%11%
1549
16th to endDay
35%311%14%19%15%
1728
February1st to 15thDay
34%28%23%22%9%
1665
16th to endDay
37%310%24%19%3
1579
March1st to 15thDay
29%414%21%18%9%
1896
16th to endDay
32%413%23%20%6%
2175
April1st to 15thDay
30%410%25%22%6%
2149
16th to endDay
21%311%25%27%10%
2160
May1st to 15thDay
16%28%23%36%13%
2151
16th to endDay
14%28%30%34%9%
2576
June1st to 15thDay
12%29%17%32%24%
2520
16th to endDay
5%129%38%43%
2520
July1st to 15thDay
7%118%26%55%
2335
16th to endDay
8%2411%27%45%
2313
August1st to 15thDay
9%110%31%45%
2204
16th to endDay
9%19%40%39%
2292
September1st to 15thDay
8%1314%32%40%
2160
16th to endDay
9%1220%42%24%
2037
October1st to 15thDay
19%35%22%26%22%
1705
16th to endDay
17%26%21%30%21%
1760
November1st to 15thDay
24%29%20%30%12%
1648
16th to endDay
24%38%21%28%12%
1620
December1st to 15thDay
35%47%20%20%10%
1482
16th to endDay
34%313%19%20%7%
1536
January1st to 15thNight
31%210%21%22%11%
2386
16th to endNight
30%411%13%22%16%
2496
February1st to 15thNight
31%29%22%24%8%
2196
16th to endNight
32%311%26%22%4
1895
March1st to 15thNight
26%415%23%20%9%
2061
16th to endNight
25%417%23%22%7%
2048
April1st to 15thNight
23%411%31%21%7%
1799
16th to endNight
16%211%28%29%11%
1800
May1st to 15thNight
14%29%24%34%14%
1800
16th to endNight
13%27%29%35%11%
1536
June1st to 15thNight
10%210%18%33%24%
1440
16th to endNight
429%37%46%
1440
July1st to 15thNight
5%127%25%58%
1393
16th to endNight
8%229%26%50%
1593
August1st to 15thNight
8%6%30%52%
1728
16th to endNight
7%117%34%47%
1910
September1st to 15thNight
9%2211%26%47%
1800
16th to endNight
7%1119%39%30%
1921
October1st to 15thNight
18%25%22%28%22%
2052
16th to endNight
18%35%20%32%20%
2112
November1st to 15thNight
18%19%23%32%14%
2209
16th to endNight
23%311%19%27%14%
2340
December1st to 15thNight
30%5%9%18%23%11%
2475
16th to endNight
35%313%20%19%8%
2688

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 15thDay
13%5%24%36%16%3
177
16th to endDay
13%7%19%30%21%8%
256
February1st to 15thDay
12%7%19%28%23%7%
252
16th to endDay
13%11%23%31%16%4
238
March1st to 15thDay
5%10%25%30%26%1
270
16th to endDay
8%11%23%31%20%4
288
April1st to 15thDay
14%11%25%28%14%5%
269
16th to endDay
411%32%30%15%5%
270
May1st to 15thDay
6%6%23%39%17%5%
288
16th to endDay
39%17%38%21%9%
330
June1st to 15thDay
26%16%35%27%11%
315
16th to endDay
12%31%30%24%
315
July1st to 15thDay
16%34%35%21%
305
16th to endDay
431%39%22%
327
August1st to 15thDay
27%30%41%17%
315
16th to endDay
2222%49%22%
332
September1st to 15thDay
27%32%38%19%
315
16th to endDay
37%33%41%12%
315
October1st to 15thDay
35%19%38%26%5%
278
16th to endDay
6%5%16%32%33%5%
272
November1st to 15thDay
7%213%17%40%18%
154
16th to endDay
6%7%17%40%23%4
90
December1st to 15thDay
11%5%20%37%23%
67
16th to endDay
14%321%34%20%6%
64
January1st to 15thNight
9%213%40%27%5%
720
16th to endNight
11%214%40%26%4
768
February1st to 15thNight
9%212%40%29%4
704
16th to endNight
12%313%46%19%4
632
March1st to 15thNight
7%214%42%27%5%
720
16th to endNight
6%416%36%33%3
768
April1st to 15thNight
6%5%21%36%26%3
719
16th to endNight
4423%29%32%6%
720
May1st to 15thNight
2214%38%35%6%
720
16th to endNight
4220%31%34%7%
414
June1st to 15thNight
1111%38%41%5%
360
16th to endNight
6%32%51%8%
360
July1st to 15thNight
214%67%16%
373
16th to endNight
18%61%26%
564
August1st to 15thNight
119%60%17%
654
16th to endNight
116%64%17%
764
September1st to 15thNight
1223%55%16%
720
16th to endNight
5%27%51%13%
716
October1st to 15thNight
5%27%34%42%7%
684
16th to endNight
5%18%33%41%10%
704
November1st to 15thNight
4110%41%37%4
700
16th to endNight
4211%40%33%7%
720
December1st to 15thNight
10%111%45%26%3
720
16th to endNight
13%216%42%22%2
768
Page generated at 2017-10-07 11:07:42. Version ac04

Copyright 2017 A. Danko


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