Camp Tres Ritos
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Tres Ritos clear sky chart from 2005-11-06 to 2024-01-16.

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
39%
24294
30%
74459
13%
24233
56%
24233
38%
36171

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
30%
898
32%
2595
11%
894
52%
894
39%
1197
January11th to 20thNight
29%
744
37%
2418
17%
744
54%
744
39%
1038
January21st to endNight
28%
792
35%
2574
15%
792
53%
792
37%
1174
February1st to 10thNight
22%
720
32%
2287
10%
720
47%
720
36%
1030
February11th to 20thNight
19%
703
32%
2098
9%
700
43%
700
32%
1018
February21st to endNight
13%
592
39%
1776
5%
592
47%
592
34%
813
March1st to 10thNight
22%
720
32%
2124
7%
720
45%
720
36%
1009
March11th to 20thNight
32%
720
32%
1980
11%
720
48%
720
41%
1006
March21st to endNight
20%
687
35%
2073
7%
687
47%
687
36%
951
April1st to 10thNight
18%
540
34%
1800
8%
540
49%
540
36%
744
April11th to 20thNight
26%
533
32%
1777
12%
533
53%
533
31%
824
April21st to endNight
24%
540
32%
1800
9%
540
56%
540
34%
824
May1st to 10thNight
30%
540
30%
1800
15%
540
52%
540
37%
840
May11th to 20thNight
39%
531
22%
1612
13%
531
51%
531
31%
883
May21st to endNight
37%
584
30%
1552
12%
582
54%
582
43%
815
June1st to 10thNight
52%
540
25%
1440
14%
540
62%
540
44%
789
June11th to 20thNight
50%
540
32%
1440
17%
540
62%
540
57%
700
June21st to endNight
57%
540
22%
1440
15%
540
63%
540
40%
848
July1st to 10thNight
68%
525
19%
1400
15%
525
69%
525
32%
890
July11th to 20thNight
76%
522
17%
1481
15%
522
77%
522
37%
863
July21st to endNight
70%
591
10%
1674
10%
558
69%
558
26%
1069
August1st to 10thNight
72%
537
12%
1684
12%
534
74%
534
30%
1015
August11th to 20thNight
67%
534
18%
1778
18%
534
70%
534
28%
1068
August21st to endNight
71%
594
20%
1980
20%
594
74%
594
36%
1076
September1st to 10thNight
67%
540
28%
1800
26%
540
73%
540
38%
956
September11th to 20thNight
66%
540
36%
1807
29%
540
76%
540
43%
883
September21st to endNight
57%
540
34%
1980
27%
540
70%
540
43%
877
October1st to 10thNight
44%
706
30%
2146
15%
706
57%
706
41%
1090
October11th to 20thNight
43%
720
41%
2160
16%
720
63%
720
51%
934
October21st to endNight
40%
792
40%
2376
15%
792
59%
792
44%
1098
November1st to 10thNight
41%
848
40%
2328
14%
848
59%
848
55%
1032
November11th to 20thNight
38%
950
41%
2470
14%
950
56%
950
54%
1141
November21st to endNight
34%
950
36%
2470
13%
950
50%
950
45%
1240
December1st to 10thNight
25%
950
35%
2598
8%
950
47%
950
41%
1243
December11th to 20thNight
26%
949
31%
3110
10%
949
45%
949
32%
1473
December21st to endNight
20%
1042
21%
4631
8%
1026
41%
1026
28%
1720

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
45%24435%5%6%8%55%
74762
Night
232432445%8%62%
75059
TransparencyDay
25%5%11%20%25%14%
74479
Night
19%413%23%26%13%
74864
SeeingDay
13%22%29%24%11%2
14092
Night
7%19%31%28%13%2
24299

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
214225%5%5%8%65%
1584
11th to 20thDay
242432345%8%65%
1669
21st to endDay
15%24436%45%6%62%
1782
February1st to 10thDay
426%425%449%59%
1670
11th to 20thDay
1425%5%35%447%62%
1749
21st to endDay
43444446%8%59%
1480
March1st to 10thDay
15%34435%35%8%59%
1833
11th to 20thDay
38%46%424447%54%
1980
21st to endDay
26%34326%5%5%8%56%
2282
April1st to 10thDay
15%243245%6%8%61%
2160
11th to 20thDay
37%25%3235%5%7%58%
2131
21st to endDay
36%24425%45%9%56%
2160
May1st to 10thDay
46%245%2446%7%56%
2160
11th to 20thDay
7%6%24436%6%5%8%49%
2275
21st to endDay
442443445%7%60%
2724
June1st to 10thDay
2424435%5%6%10%56%
2520
11th to 20thDay
3212335%5%5%8%63%
2520
21st to endDay
6%4246%36%6%8%8%48%
2520
July1st to 10thDay
7%5%35%7%47%7%8%8%39%
2520
11th to 20thDay
5%6%26%7%48%7%8%9%37%
2426
21st to endDay
9%6%48%8%6%9%8%9%9%25%
2545
August1st to 10thDay
8%6%46%8%6%7%5%7%7%35%
2244
11th to 20thDay
9%5%26%7%6%6%7%6%7%39%
2123
21st to endDay
7%6%36%5%46%6%6%9%42%
2376
September1st to 10thDay
9%6%26%7%35%5%6%7%44%
2160
11th to 20thDay
7%5%25%43446%7%54%
2152
21st to endDay
5%42442335%6%63%
1980
October1st to 10thDay
8%6%24434446%55%
1810
11th to 20thDay
4312222245%73%
1800
21st to endDay
45%2321333471%
1980
November1st to 10thDay
121222236%8%71%
1730
11th to 20thDay
141321335%8%69%
1710
21st to endDay
142442335%8%63%
1710
December1st to 10thDay
142412345%9%66%
1577
11th to 20thDay
1424325%5%6%10%58%
1926
21st to endDay
1424423447%65%
2794
January1st to 10thNight
313325%348%67%
2595
11th to 20thNight
1314313448%68%
2418
21st to endNight
1324425%36%9%62%
2574
February1st to 10thNight
324424448%64%
2287
11th to 20thNight
1335%3245%5%8%61%
2098
21st to endNight
1315%324347%66%
1776
March1st to 10thNight
132332445%9%64%
2124
11th to 20thNight
25%2433345%7%63%
1980
21st to endNight
232332445%8%65%
2073
April1st to 10thNight
1322325%348%68%
1800
11th to 20thNight
25%2432345%7%62%
1777
21st to endNight
3423323348%64%
1800
May1st to 10thNight
35%23324446%63%
1800
11th to 20thNight
5%7%2442445%8%53%
1612
21st to endNight
4313333447%65%
1552
June1st to 10thNight
2313435%6%7%10%55%
1440
11th to 20thNight
11123245%7%6%68%
1440
21st to endNight
6%413335%7%6%10%51%
1440
July1st to 10thNight
5%426%6%37%7%7%9%45%
1440
11th to 20thNight
2225%6%37%6%9%12%47%
1530
21st to endNight
6%5%26%5%47%7%9%12%36%
1773
August1st to 10thNight
5%3145%46%8%8%12%43%
1693
11th to 20thNight
7%325%6%47%6%9%11%39%
1778
21st to endNight
43344446%9%11%47%
1980
September1st to 10thNight
5%424435%6%6%9%52%
1800
11th to 20thNight
441422447%8%60%
1807
21st to endNight
5%31332345%7%65%
1980
October1st to 10thNight
5%423333345%64%
2146
11th to 20thNight
2312212245%77%
2160
21st to endNight
342231335%6%69%
2376
November1st to 10thNight
1212222446%76%
2328
11th to 20thNight
11222335%8%74%
2470
21st to endNight
142432446%7%64%
2470
December1st to 10thNight
1323323347%69%
2598
11th to 20thNight
1325%436%46%11%57%
3271
21st to endNight
131342445%8%65%
4873

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
13%413%29%31%11%
1585
11th to 20thDay
16%312%28%30%11%
1669
21st to endDay
20%39%23%30%14%
1782
February1st to 10thDay
21%314%23%25%14%
1670
11th to 20thDay
20%49%27%25%15%
1759
21st to endDay
20%29%18%32%19%
1480
March1st to 10thDay
20%39%23%28%15%
1833
11th to 20thDay
28%37%21%30%11%
1980
21st to endDay
23%312%26%26%11%
2282
April1st to 10thDay
18%310%26%26%16%
2160
11th to 20thDay
24%37%24%29%13%
2134
21st to endDay
23%410%24%29%10%
2160
May1st to 10thDay
26%49%20%27%13%
2160
11th to 20thDay
32%7%12%18%23%8%
2279
21st to endDay
23%5%10%17%25%19%
2724
June1st to 10thDay
23%6%13%21%23%14%
2520
11th to 20thDay
18%6%8%16%25%28%
2520
21st to endDay
30%7%10%17%19%16%
2520
July1st to 10thDay
38%10%14%13%15%10%
2451
11th to 20thDay
36%11%16%20%11%6%
2352
21st to endDay
48%12%21%15%41
2404
August1st to 10thDay
43%10%15%14%11%7%
2229
11th to 20thDay
40%9%13%17%15%6%
2123
21st to endDay
35%8%14%22%17%4
2376
September1st to 10thDay
36%8%12%18%18%8%
2160
11th to 20thDay
28%6%10%18%23%14%
2152
21st to endDay
22%47%21%32%13%
1980
October1st to 10thDay
28%5%8%19%25%16%
1810
11th to 20thDay
15%2414%38%27%
1800
21st to endDay
19%26%21%36%16%
1980
November1st to 10thDay
11%210%21%36%20%
1730
11th to 20thDay
12%39%28%35%14%
1710
21st to endDay
19%27%21%30%21%
1710
December1st to 10thDay
15%315%27%26%14%
1577
11th to 20thDay
19%313%22%27%15%
1924
21st to endDay
17%29%19%32%20%
2794
January1st to 10thNight
15%313%28%30%12%
2595
11th to 20thNight
15%311%31%28%13%
2418
21st to endNight
18%310%26%31%12%
2574
February1st to 10thNight
17%215%25%25%15%
2287
11th to 20thNight
19%411%29%24%14%
2098
21st to endNight
17%110%20%33%19%
1776
March1st to 10thNight
16%311%27%28%14%
2124
11th to 20thNight
19%311%26%31%10%
1980
21st to endNight
16%313%26%33%8%
2073
April1st to 10thNight
14%312%28%29%14%
1800
11th to 20thNight
20%39%24%30%14%
1777
21st to endNight
19%412%28%28%9%
1800
May1st to 10thNight
20%310%23%30%13%
1800
11th to 20thNight
27%6%15%19%23%9%
1613
21st to endNight
19%5%14%18%26%18%
1552
June1st to 10thNight
20%7%17%20%20%15%
1440
11th to 20thNight
14%5%9%18%26%28%
1440
21st to endNight
27%7%13%16%20%16%
1440
July1st to 10thNight
32%11%15%15%14%13%
1400
11th to 20thNight
24%12%23%21%11%8%
1481
21st to endNight
35%12%33%16%5%
1674
August1st to 10thNight
29%13%24%14%12%8%
1684
11th to 20thNight
34%9%19%22%12%4
1778
21st to endNight
26%8%23%24%16%4
1980
September1st to 10thNight
25%8%18%25%17%8%
1800
11th to 20thNight
21%6%14%18%29%12%
1807
21st to endNight
19%411%25%31%11%
1980
October1st to 10thNight
22%412%19%28%15%
2146
11th to 20thNight
11%36%18%37%25%
2160
21st to endNight
17%27%24%35%15%
2376
November1st to 10thNight
10%27%26%38%17%
2328
11th to 20thNight
9%39%29%34%16%
2470
21st to endNight
16%210%23%28%20%
2470
December1st to 10thNight
15%314%31%26%12%
2598
11th to 20thNight
19%314%23%27%15%
3272
21st to endNight
16%313%22%29%17%
4873

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
15%37%25%16%7%
270
11th to 20thDay
22%33%25%15%41
257
21st to endDay
10%38%34%14%31
264
February1st to 10thDay
13%41%28%15%3
240
11th to 20thDay
16%43%25%13%3
240
21st to endDay
35%31%27%6%1
198
March1st to 10thDay
22%34%26%14%3
273
11th to 20thDay
24%28%33%12%31
420
21st to endDay
28%39%25%7%1
462
April1st to 10thDay
17%41%30%9%3
420
11th to 20thDay
25%38%27%8%1
412
21st to endDay
21%40%28%10%1
420
May1st to 10thDay
13%38%37%9%31
423
11th to 20thDay
11%24%35%21%7%2
566
21st to endDay
9%23%35%24%9%
679
June1st to 10thDay
413%34%33%15%1
630
11th to 20thDay
5%16%34%28%15%2
630
21st to endDay
6%13%29%30%19%3
630
July1st to 10thDay
7%323%37%26%4
621
11th to 20thDay
7%218%37%28%8%
525
21st to endDay
9%213%39%31%6%
487
August1st to 10thDay
10%6%22%40%17%5%
447
11th to 20thDay
6%5%30%37%20%2
437
21st to endDay
9%5%27%35%21%3
495
September1st to 10thDay
9%7%26%39%16%2
450
11th to 20thDay
9%8%37%32%13%1
442
21st to endDay
7%16%31%31%11%4
270
October1st to 10thDay
10%26%29%22%11%3
270
11th to 20thDay
10%26%32%21%8%3
270
21st to endDay
17%22%31%22%7%1
297
November1st to 10thDay
14%31%28%24%4
270
11th to 20thDay
9%28%34%21%8%
270
21st to endDay
11%34%30%14%9%1
270
December1st to 10thDay
19%29%31%13%8%1
270
11th to 20thDay
17%35%27%16%4
270
21st to endDay
23%37%27%10%3
297
January1st to 10thNight
9%25%31%23%10%1
898
11th to 20thNight
9%26%33%24%6%2
744
21st to endNight
6%28%37%19%9%2
792
February1st to 10thNight
7%28%41%18%5%
720
11th to 20thNight
7%33%38%18%5%
704
21st to endNight
11%34%42%13%1
592
March1st to 10thNight
9%31%34%20%5%1
720
11th to 20thNight
10%21%34%26%9%
720
21st to endNight
12%26%40%18%3
687
April1st to 10thNight
10%28%42%18%2
540
11th to 20thNight
11%29%32%24%4
533
21st to endNight
9%27%37%23%3
540
May1st to 10thNight
7%19%40%23%9%1
540
11th to 20thNight
9%19%29%28%14%2
531
21st to endNight
6%17%37%32%8%
584
June1st to 10thNight
47%28%42%18%
540
11th to 20thNight
29%38%41%10%1
540
21st to endNight
36%27%37%25%2
540
July1st to 10thNight
3215%44%33%3
525
11th to 20thNight
319%40%41%6%
522
21st to endNight
6%19%32%43%10%
591
August1st to 10thNight
5%29%39%36%9%
537
11th to 20thNight
7%214%44%30%3
534
21st to endNight
3214%42%35%5%
594
September1st to 10thNight
6%218%44%27%3
540
11th to 20thNight
5%420%46%23%2
540
21st to endNight
6%10%24%43%16%1
540
October1st to 10thNight
6%13%32%35%13%1
706
11th to 20thNight
6%18%31%31%11%3
720
21st to endNight
8%20%29%26%13%4
792
November1st to 10thNight
5%19%33%30%11%1
848
11th to 20thNight
5%23%33%27%10%2
950
21st to endNight
7%24%32%24%12%1
950
December1st to 10thNight
12%24%37%19%7%1
950
11th to 20thNight
9%30%32%22%6%1
950
21st to endNight
12%28%36%20%41
1045
Page generated at 2024-01-13 17:28:28. Version ac07

Copyright 2024 Attilla Danko


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