Corrales
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Corrales clear sky chart from 2005-11-05 to 2017-10-31.

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
58%
15839
31%
47460
21%
15796
67%
15796
43%
24648

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
60%
718
32%
2327
27%
716
69%
716
48%
1094
January16th to endNight
53%
768
35%
2496
26%
768
67%
768
43%
1220
February1st to 15thNight
50%
703
30%
2235
20%
700
63%
700
43%
1112
February16th to endNight
42%
632
38%
1894
21%
632
62%
632
42%
981
March1st to 15thNight
52%
720
34%
2008
21%
720
62%
720
42%
1110
March16th to endNight
49%
738
35%
2082
18%
738
63%
738
47%
1057
April1st to 15thNight
38%
539
33%
1798
16%
539
59%
539
35%
885
April16th to endNight
40%
540
34%
1800
19%
540
62%
540
38%
850
May1st to 15thNight
45%
539
27%
1794
18%
539
59%
539
39%
876
May16th to endNight
52%
563
31%
1582
18%
561
64%
561
45%
828
June1st to 15thNight
57%
540
27%
1440
17%
540
65%
540
50%
753
June16th to endNight
65%
540
27%
1440
20%
540
69%
540
52%
757
July1st to 15thNight
70%
510
16%
1488
14%
510
72%
510
33%
918
July16th to endNight
78%
564
18%
1593
17%
531
78%
531
31%
963
August1st to 15thNight
78%
539
18%
1692
18%
536
79%
536
34%
986
August16th to endNight
75%
573
24%
1910
26%
573
78%
573
35%
1054
September1st to 15thNight
71%
540
25%
1800
24%
540
75%
540
32%
1044
September16th to endNight
65%
594
36%
1947
30%
594
73%
594
48%
928
October1st to 15thNight
61%
720
34%
2160
22%
720
70%
720
50%
1052
October16th to endNight
67%
768
40%
2304
27%
768
76%
768
54%
1086
November1st to 15thNight
63%
743
40%
2143
25%
743
73%
743
60%
978
November16th to endNight
61%
900
38%
2340
24%
900
68%
900
52%
1233
December1st to 15thNight
54%
900
32%
2511
19%
900
64%
900
46%
1331
December16th to endNight
48%
948
30%
2676
19%
948
57%
948
37%
1552

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
331332345%7%61%
48273
Night
431332345%6%61%
47657
TransparencyDay
21%5%9%22%26%15%
47969
Night
22%49%21%26%15%
47462
SeeingDay
5%13%25%33%18%2
5632
Night
5%7%23%39%20%2
15843

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
3312213346%65%
1611
16th to endDay
5%323212235%67%
1728
February1st to 15thDay
36%23313245%63%
1626
16th to endDay
35%1332235%7%61%
1580
March1st to 15thDay
3313323347%61%
1950
16th to endDay
331321345%6%64%
2142
April1st to 15thDay
3313213347%64%
2150
16th to endDay
4212222345%68%
2160
May1st to 15thDay
2113323448%62%
2153
16th to endDay
3212313345%67%
2528
June1st to 15thDay
21221446%8%66%
2520
16th to endDay
11121335%7%69%
2520
July1st to 15thDay
32135%35%6%8%12%46%
2377
16th to endDay
4214427%7%10%12%41%
2467
August1st to 15thDay
42145%25%6%8%10%48%
2256
16th to endDay
42134345%8%11%49%
2292
September1st to 15thDay
6%3134345%7%8%50%
2160
16th to endDay
421231344467%
2010
October1st to 15thDay
411222324469%
1800
16th to endDay
2112212235%75%
1918
November1st to 15thDay
221212346%71%
1702
16th to endDay
3313212226%69%
1620
December1st to 15thDay
5%5%23212345%64%
1446
16th to endDay
6%5%2431335%7%55%
1557
January1st to 15thNight
4413212235%68%
2327
16th to endNight
6%312213237%64%
2496
February1st to 15thNight
45%13212335%64%
2225
16th to endNight
4413212345%65%
1894
March1st to 15thNight
5%413322345%61%
2008
16th to endNight
4312222335%68%
2082
April1st to 15thNight
4323323237%62%
1798
16th to endNight
6%312212345%66%
1800
May1st to 15thNight
421332445%7%61%
1794
16th to endNight
4213313445%65%
1582
June1st to 15thNight
2112325%45%8%62%
1440
16th to endNight
11132246%6%10%60%
1440
July1st to 15thNight
32145%36%8%9%9%43%
1578
16th to endNight
22245%46%8%10%12%39%
1701
August1st to 15thNight
3213446%7%8%11%44%
1701
16th to endNight
42125%35%5%10%12%45%
1910
September1st to 15thNight
5%3145%45%7%7%9%45%
1800
16th to endNight
4313313346%65%
1947
October1st to 15thNight
4212313335%68%
2160
16th to endNight
321222332472%
2304
November1st to 15thNight
322212235%75%
2143
16th to endNight
5%31221223470%
2340
December1st to 15thNight
6%413212336%64%
2511
16th to endNight
7%5%23314346%56%
2676

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
19%410%32%28%4
1612
16th to endDay
21%38%27%29%8%
1728
February1st to 15thDay
24%38%28%23%10%
1627
16th to endDay
22%36%23%31%12%
1580
March1st to 15thDay
22%4421%33%13%
1950
16th to endDay
20%45%20%35%14%
2142
April1st to 15thDay
20%4420%33%15%
2150
16th to endDay
19%3417%34%20%
2160
May1st to 15thDay
19%5%7%18%29%19%
2153
16th to endDay
18%46%18%28%24%
2531
June1st to 15thDay
15%47%16%21%35%
2520
16th to endDay
14%36%19%23%32%
2520
July1st to 15thDay
26%8%14%18%16%15%
2238
16th to endDay
26%11%19%27%11%2
2312
August1st to 15thDay
27%9%16%20%18%6%
2241
16th to endDay
26%8%14%24%18%7%
2292
September1st to 15thDay
28%7%13%20%19%10%
2160
16th to endDay
19%36%20%29%20%
2010
October1st to 15thDay
18%46%18%33%19%
1800
16th to endDay
13%37%20%36%17%
1918
November1st to 15thDay
14%37%23%37%12%
1702
16th to endDay
19%2424%36%12%
1620
December1st to 15thDay
24%39%36%20%5%
1446
16th to endDay
29%5%12%30%18%3
1557
January1st to 15thNight
21%29%31%29%6%
2327
16th to endNight
22%37%27%30%8%
2496
February1st to 15thNight
23%39%26%23%12%
2235
16th to endNight
23%3421%34%13%
1894
March1st to 15thNight
25%4422%30%13%
2008
16th to endNight
19%35%17%37%16%
2082
April1st to 15thNight
24%2320%30%18%
1798
16th to endNight
20%4413%34%22%
1800
May1st to 15thNight
22%5%8%16%26%20%
1795
16th to endNight
21%49%16%23%24%
1583
June1st to 15thNight
19%5%9%14%16%34%
1440
16th to endNight
18%5%11%12%18%32%
1440
July1st to 15thNight
31%9%17%16%12%13%
1488
16th to endNight
31%9%23%22%10%2
1593
August1st to 15thNight
28%9%19%20%13%8%
1692
16th to endNight
26%9%18%23%15%7%
1910
September1st to 15thNight
31%8%17%17%14%10%
1800
16th to endNight
20%37%17%27%23%
1947
October1st to 15thNight
19%38%15%28%24%
2160
16th to endNight
16%35%16%35%22%
2304
November1st to 15thNight
14%2422%40%16%
2143
16th to endNight
20%1420%34%18%
2340
December1st to 15thNight
22%39%30%28%5%
2511
16th to endNight
29%5%9%32%20%3
2676

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
7%12%33%37%8%
90
16th to endDay
5%18%32%27%16%
96
February1st to 15thDay
5%15%27%34%16%
90
16th to endDay
423%30%25%14%
81
March1st to 15thDay
7%24%32%27%7%
240
16th to endDay
9%33%30%18%8%
288
April1st to 15thDay
9%32%34%17%5%
269
16th to endDay
8%35%35%16%3
270
May1st to 15thDay
6%26%40%20%4
288
16th to endDay
5%16%34%28%13%1
429
June1st to 15thDay
210%23%38%24%1
495
16th to endDay
1418%38%34%2
495
July1st to 15thDay
3418%45%25%2
342
16th to endDay
5%210%37%35%8%
327
August1st to 15thDay
4114%46%29%3
315
16th to endDay
6%317%41%26%5%
332
September1st to 15thDay
7%422%42%20%2
315
16th to endDay
6%8%35%35%13%1
225
October1st to 15thDay
314%26%34%16%4
135
16th to endDay
6%5%20%37%26%4
144
November1st to 15thDay
412%25%37%18%1
90
16th to endDay
10%26%27%26%8%
90
December1st to 15thDay
11%13%34%34%6%
90
16th to endDay
22%10%30%30%6%
96
January1st to 15thNight
5%425%42%19%1
720
16th to endNight
7%8%26%37%17%1
768
February1st to 15thNight
6%8%30%38%14%1
704
16th to endNight
6%14%35%37%6%
632
March1st to 15thNight
7%11%26%39%14%
720
16th to endNight
6%13%28%38%13%
738
April1st to 15thNight
5%21%33%32%7%
539
16th to endNight
7%18%30%34%7%
540
May1st to 15thNight
5%12%32%39%9%
540
16th to endNight
6%9%28%37%17%
563
June1st to 15thNight
25%29%44%16%
540
16th to endNight
2224%43%26%1
540
July1st to 15thNight
3213%41%34%4
510
16th to endNight
26%37%45%6%
564
August1st to 15thNight
417%34%44%7%
539
16th to endNight
419%39%40%4
573
September1st to 15thNight
5%214%43%31%2
540
16th to endNight
6%219%42%27%1
594
October1st to 15thNight
5%5%23%43%20%2
720
16th to endNight
35%19%41%24%4
768
November1st to 15thNight
45%25%39%24%1
743
16th to endNight
7%10%19%36%23%3
900
December1st to 15thNight
8%8%25%41%15%1
900
16th to endNight
10%8%27%39%12%1
948
Page generated at 2017-11-01 15:23:36. Version ac04

Copyright 2017 A. Danko


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