Rancho Caņada del Oro
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rancho Caņada del Oro clear sky chart from 2005-11-05 to 2017-09-18.

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
68%
15443
26%
46921
23%
15407
71%
15407
37%
26478

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
20%
2380
22%
716
68%
716
31%
1371
January16th to endNight
61%
768
25%
2496
26%
768
63%
768
29%
1504
February1st to 15thNight
58%
698
24%
2273
24%
698
64%
698
28%
1376
February16th to endNight
54%
632
23%
1895
19%
632
60%
632
29%
1182
March1st to 15thNight
57%
720
18%
2016
16%
720
60%
720
29%
1318
March16th to endNight
56%
768
20%
2080
16%
768
60%
768
31%
1340
April1st to 15thNight
56%
719
23%
1799
14%
719
58%
719
34%
1164
April16th to endNight
60%
720
25%
1800
12%
720
64%
720
44%
1043
May1st to 15thNight
70%
646
22%
1726
15%
646
72%
646
42%
983
May16th to endNight
70%
390
23%
1513
24%
390
74%
390
33%
754
June1st to 15thNight
76%
360
24%
1440
26%
360
82%
360
34%
703
June16th to endNight
85%
360
31%
1440
41%
360
87%
360
45%
606
July1st to 15thNight
90%
382
26%
1402
32%
382
90%
382
47%
619
July16th to endNight
82%
564
27%
1593
25%
531
83%
531
39%
859
August1st to 15thNight
75%
577
25%
1650
20%
574
76%
574
38%
931
August16th to endNight
84%
764
31%
1910
20%
764
84%
764
50%
1090
September1st to 15thNight
86%
720
35%
1800
26%
720
87%
720
59%
948
September16th to endNight
81%
667
37%
1821
35%
667
82%
667
55%
929
October1st to 15thNight
76%
660
29%
1980
31%
660
79%
660
45%
1037
October16th to endNight
73%
704
33%
2112
35%
704
76%
704
42%
1135
November1st to 15thNight
71%
700
30%
2187
30%
700
74%
700
42%
1151
November16th to endNight
67%
720
26%
2400
27%
720
71%
720
35%
1298
December1st to 15thNight
59%
720
23%
2520
22%
720
65%
720
26%
1516
December16th to endNight
53%
768
21%
2688
20%
768
59%
768
25%
1621

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
7%423323346%58%
47871
Night
7%42432445%7%53%
47108
TransparencyDay
27%49%19%24%15%
47559
Night
30%49%19%21%14%
46922
SeeingDay
8%7%20%34%22%6%
6026
Night
10%211%31%34%10%
15455

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
12%425%432447%48%
1555
16th to endDay
16%425%423345%45%
1728
February1st to 15thDay
15%7%25%333445%44%
1591
16th to endDay
18%6%34424446%39%
1579
March1st to 15thDay
13%5%25%436%5%49%37%
1941
16th to endDay
11%5%35%5%345%47%41%
2142
April1st to 15thDay
13%7%24423347%44%
2149
16th to endDay
8%323313348%57%
2160
May1st to 15thDay
3413212348%63%
2221
16th to endDay
45%24333348%56%
2596
June1st to 15thDay
4413213447%62%
2520
16th to endDay
12212236%76%
2520
July1st to 15thDay
112112235%75%
2472
16th to endDay
1112112335%76%
2468
August1st to 15thDay
213213236%71%
2301
16th to endDay
112212236%75%
2292
September1st to 15thDay
1311111226%76%
2160
16th to endDay
223212336%71%
1862
October1st to 15thDay
4313322447%62%
1650
16th to endDay
6%323324346%60%
1760
November1st to 15thDay
8%425%324346%54%
1671
16th to endDay
10%5%24423436%52%
1557
December1st to 15thDay
15%6%25%5%24445%42%
1440
16th to endDay
15%7%35%5%24347%40%
1536
January1st to 15thNight
11%425%32445%7%47%
2380
16th to endNight
14%5%2342445%6%47%
2496
February1st to 15thNight
12%5%25%42445%7%44%
2261
16th to endNight
16%6%2431345%7%42%
1895
March1st to 15thNight
12%6%345%3445%7%42%
2016
16th to endNight
12%5%245%3335%7%45%
2080
April1st to 15thNight
12%42442445%7%46%
1799
16th to endNight
6%314314349%58%
1800
May1st to 15thNight
1314324448%57%
1726
16th to endNight
332342445%10%56%
1512
June1st to 15thNight
122332345%9%61%
1440
16th to endNight
113313436%69%
1440
July1st to 15thNight
1211335%9%67%
1485
16th to endNight
213435%5%6%10%55%
1701
August1st to 15thNight
1425%42445%10%53%
1659
16th to endNight
21332446%8%61%
1910
September1st to 15thNight
122223448%67%
1800
16th to endNight
2313222347%67%
1821
October1st to 15thNight
5%313323348%60%
1980
16th to endNight
5%313324447%59%
2112
November1st to 15thNight
6%413313447%58%
2187
16th to endNight
7%424424447%53%
2400
December1st to 15thNight
13%6%24424345%46%
2520
16th to endNight
17%424424346%44%
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
35%412%20%17%9%
1555
16th to endDay
41%47%13%19%13%
1728
February1st to 15thDay
40%48%20%19%6%
1591
16th to endDay
45%5%8%22%13%4
1579
March1st to 15thDay
42%6%11%19%15%5%
1941
16th to endDay
41%6%13%18%16%3
2142
April1st to 15thDay
38%6%11%21%19%2
2149
16th to endDay
27%5%14%24%20%8%
2160
May1st to 15thDay
21%410%29%27%7%
2221
16th to endDay
29%412%23%22%6%
2600
June1st to 15thDay
24%5%10%23%23%12%
2520
16th to endDay
13%36%17%34%24%
2520
July1st to 15thDay
14%25%10%23%43%
2327
16th to endDay
12%35%12%28%36%
2313
August1st to 15thDay
19%2313%29%32%
2285
16th to endDay
14%2416%32%30%
2292
September1st to 15thDay
14%25%15%32%30%
2160
16th to endDay
17%15%24%31%19%
1862
October1st to 15thDay
21%38%21%26%18%
1650
16th to endDay
25%49%20%23%15%
1760
November1st to 15thDay
30%310%24%24%7%
1671
16th to endDay
33%39%19%27%5%
1557
December1st to 15thDay
42%411%16%19%6%
1440
16th to endDay
43%311%16%17%6%
1536
January1st to 15thNight
35%411%22%18%9%
2380
16th to endNight
36%5%10%13%17%16%
2496
February1st to 15thNight
39%310%20%18%8%
2273
16th to endNight
39%412%25%15%3
1895
March1st to 15thNight
40%5%12%18%15%7%
2016
16th to endNight
38%5%12%20%17%6%
2080
April1st to 15thNight
35%5%12%24%18%3
1799
16th to endNight
23%6%14%26%20%9%
1800
May1st to 15thNight
26%5%10%19%26%10%
1727
16th to endNight
26%6%15%23%22%5%
1513
June1st to 15thNight
23%7%10%20%20%16%
1440
16th to endNight
19%3414%30%28%
1440
July1st to 15thNight
18%5%5%9%20%40%
1402
16th to endNight
28%47%12%16%30%
1593
August1st to 15thNight
32%25%12%20%26%
1650
16th to endNight
24%35%10%27%28%
1910
September1st to 15thNight
18%26%13%26%32%
1800
16th to endNight
19%3417%35%19%
1821
October1st to 15thNight
24%38%22%21%19%
1980
16th to endNight
27%37%22%23%17%
2112
November1st to 15thNight
26%411%24%25%8%
2187
16th to endNight
29%49%22%24%9%
2400
December1st to 15thNight
39%49%18%19%8%
2520
16th to endNight
39%413%17%17%7%
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
18%9%20%31%13%5%
183
16th to endDay
18%7%21%25%19%6%
256
February1st to 15thDay
16%11%22%24%20%5%
239
16th to endDay
19%11%25%26%14%2
238
March1st to 15thDay
15%12%26%24%16%4
270
16th to endDay
14%13%28%30%11%1
288
April1st to 15thDay
17%14%32%23%9%2
269
16th to endDay
11%15%31%28%10%2
270
May1st to 15thDay
8%12%31%33%10%3
288
16th to endDay
8%10%21%35%18%5%
330
June1st to 15thDay
5%6%29%36%16%5%
315
16th to endDay
1217%42%26%9%
315
July1st to 15thDay
11%45%31%10%
305
16th to endDay
17%46%30%13%
327
August1st to 15thDay
314%40%31%8%
315
16th to endDay
11%41%32%13%
332
September1st to 15thDay
2114%42%27%10%
315
16th to endDay
4415%32%31%10%
264
October1st to 15thDay
6%7%23%32%23%5%
255
16th to endDay
10%424%31%25%3
272
November1st to 15thDay
7%7%12%25%29%15%
177
16th to endDay
8%6%21%36%25%1
79
December1st to 15thDay
20%13%25%25%15%1
60
16th to endDay
10%12%12%28%28%7%
64
January1st to 15thNight
14%111%33%30%8%
720
16th to endNight
18%210%31%27%10%
768
February1st to 15thNight
15%414%28%29%7%
704
16th to endNight
20%315%35%19%5%
632
March1st to 15thNight
16%315%29%30%6%
720
16th to endNight
14%5%16%33%26%4
768
April1st to 15thNight
13%6%16%36%23%3
719
16th to endNight
8%6%18%33%25%7%
720
May1st to 15thNight
4115%38%32%7%
647
16th to endNight
5%214%31%38%7%
391
June1st to 15thNight
3113%39%36%5%
360
16th to endNight
15%37%49%5%
360
July1st to 15thNight
2220%58%14%
382
16th to endNight
31418%50%22%
564
August1st to 15thNight
5%16%24%50%11%
577
16th to endNight
2426%51%14%
764
September1st to 15thNight
2428%47%16%
720
16th to endNight
5%7%27%43%15%
667
October1st to 15thNight
8%28%31%33%15%
660
16th to endNight
8%111%28%32%18%
704
November1st to 15thNight
9%111%33%32%11%
700
16th to endNight
8%210%35%30%11%
720
December1st to 15thNight
18%210%33%26%7%
720
16th to endNight
19%416%34%21%4
768
Page generated at 2017-09-19 04:32:21. Version ac04

Copyright 2017 A. Danko


Rancho Caņada del Oro Clear Sky Chart | Charts Home