Carmel
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carmel clear sky chart from 2005-11-05 to

2017-09-12
.

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
38%
15794
18%
46750
11%
15752
44%
15752
23%
31440

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
17%
899
14%
2506
5%
895
25%
895
14%
1926
January16th to endNight
20%
914
12%
2642
6%
914
25%
914
14%
2038
February1st to 15thNight
21%
702
11%
2115
4%
701
27%
701
15%
1536
February16th to endNight
23%
631
15%
1893
7%
631
31%
631
16%
1378
March1st to 15thNight
25%
720
14%
2145
8%
720
31%
720
18%
1523
March16th to endNight
28%
717
15%
2061
7%
717
36%
717
19%
1472
April1st to 15thNight
30%
539
17%
1797
10%
539
41%
539
22%
1169
April16th to endNight
34%
540
21%
1693
11%
540
44%
540
25%
1093
May1st to 15thNight
31%
540
14%
1620
8%
540
37%
540
19%
1154
May16th to endNight
50%
562
17%
1642
11%
561
55%
561
28%
1078
June1st to 15thNight
56%
540
18%
1440
13%
540
60%
540
36%
892
June16th to endNight
56%
540
18%
1440
12%
540
61%
540
34%
919
July1st to 15thNight
61%
510
17%
1360
13%
510
64%
510
35%
847
July16th to endNight
71%
564
24%
1461
18%
531
75%
531
44%
820
August1st to 15thNight
68%
539
23%
1609
20%
536
71%
536
37%
927
August16th to endNight
70%
573
22%
1908
20%
573
74%
573
36%
1028
September1st to 15thNight
61%
595
26%
1832
23%
595
67%
595
34%
1066
September16th to endNight
60%
657
26%
1815
20%
657
63%
657
35%
1107
October1st to 15thNight
51%
660
28%
1815
21%
660
59%
660
35%
1109
October16th to endNight
29%
704
19%
2264
14%
704
38%
704
23%
1442
November1st to 15thNight
39%
700
26%
2276
18%
700
50%
700
28%
1350
November16th to endNight
29%
720
18%
2340
12%
720
37%
720
18%
1600
December1st to 15thNight
21%
768
11%
2388
6%
768
27%
768
13%
1822
December16th to endNight
17%
960
11%
2688
3%
960
24%
960
12%
2144

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
14%7%36%5%3445%7%36%
47908
Night
14%7%36%5%24447%38%
46924
Cloud CoverDay
14%7%36%5%3445%7%36%
47917
Night
14%7%36%5%24447%38%
46929
TransparencyDay
46%5%11%21%12%1
47600
Night
45%5%11%21%14%2
46750
SeeingDay
16%8%25%24%17%8%
5810
Night
18%8%28%28%14%1
15798

By Month

Percentage Cloud Cover NE (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
19%14%5%8%5%3334426%
1432
16th to endDay
13%15%8%9%5%34345%26%
1581
February1st to 15thDay
15%11%6%8%7%35%345%27%
1744
16th to endDay
15%13%49%6%34335%28%
1580
March1st to 15thDay
20%9%48%6%24446%28%
1805
16th to endDay
17%10%47%5%3445%7%30%
2172
April1st to 15thDay
19%9%25%423347%36%
2151
16th to endDay
19%5%36%6%23446%37%
2265
May1st to 15thDay
21%8%36%6%3335%6%31%
2331
16th to endDay
12%5%25%6%46%5%6%7%37%
2471
June1st to 15thDay
11%5%25%435%5%5%8%42%
2520
16th to endDay
9%425%5%36%46%10%40%
2520
July1st to 15thDay
11%5%25%6%345%6%11%38%
2520
16th to endDay
6%3245%36%7%7%11%41%
2607
August1st to 15thDay
8%4245%345%7%8%44%
2340
16th to endDay
9%416%5%35%45%8%43%
2293
September1st to 15thDay
12%5%25%4245%6%7%42%
2035
16th to endDay
13%425%42435%7%46%
1815
October1st to 15thDay
14%6%16%42345%7%43%
1815
16th to endDay
17%6%36%43345%6%38%
1604
November1st to 15thDay
12%6%25%423346%47%
1582
16th to endDay
18%9%46%5%2335%6%32%
1620
December1st to 15thDay
21%14%48%5%2433425%
1569
16th to endDay
21%16%5%9%424346%21%
1536
January1st to 15thNight
19%11%5%8%5%3344427%
2506
16th to endNight
16%13%6%8%6%34335%27%
2642
February1st to 15thNight
16%12%5%7%5%23446%31%
2113
16th to endNight
15%10%6%8%6%34445%30%
1893
March1st to 15thNight
17%8%37%5%25%35%7%33%
2132
16th to endNight
16%9%46%6%34447%34%
2061
April1st to 15thNight
15%7%345%3445%6%39%
1797
16th to endNight
17%6%2442445%7%41%
1693
May1st to 15thNight
20%6%35%5%3445%7%32%
1620
16th to endNight
11%5%35%425%5%5%9%40%
1640
June1st to 15thNight
8%5%25%42345%8%49%
1440
16th to endNight
8%325%5%35%5%6%9%45%
1440
July1st to 15thNight
9%324435%5%6%8%47%
1440
16th to endNight
5%3143236%5%8%55%
1561
August1st to 15thNight
6%3144235%7%10%50%
1620
16th to endNight
6%2145%345%6%8%52%
1908
September1st to 15thNight
10%5%1342335%7%50%
1832
16th to endNight
10%424334447%49%
1815
October1st to 15thNight
11%32433345%7%50%
1815
16th to endNight
18%6%34323346%42%
2264
November1st to 15thNight
13%6%24313445%48%
2276
16th to endNight
19%10%46%423337%34%
2340
December1st to 15thNight
21%11%6%8%6%2333426%
2388
16th to endNight
24%13%5%6%6%33435%23%
2688

Percentage Cloud Cover SE (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
19%14%5%9%5%3434426%
1432
16th to endDay
13%15%8%9%6%33345%26%
1581
February1st to 15thDay
15%11%6%9%7%35%345%27%
1744
16th to endDay
15%12%410%6%34335%28%
1580
March1st to 15thDay
21%9%47%5%24446%28%
1815
16th to endDay
17%10%47%5%2445%7%31%
2171
April1st to 15thDay
19%9%25%423347%36%
2151
16th to endDay
19%5%36%6%23446%36%
2265
May1st to 15thDay
21%7%46%5%3345%6%31%
2331
16th to endDay
12%5%25%6%36%5%6%7%37%
2471
June1st to 15thDay
11%5%25%435%45%8%42%
2520
16th to endDay
9%425%5%35%46%10%40%
2520
July1st to 15thDay
11%5%25%5%345%6%11%38%
2520
16th to endDay
6%3245%36%6%7%10%42%
2607
August1st to 15thDay
8%4345%35%5%7%9%43%
2340
16th to endDay
8%5%25%6%35%45%8%43%
2293
September1st to 15thDay
12%5%35%5%2447%7%42%
2035
16th to endDay
12%425%42435%7%46%
1815
October1st to 15thDay
13%6%25%423447%43%
1815
16th to endDay
16%6%36%42445%6%38%
1604
November1st to 15thDay
12%6%25%423346%47%
1582
16th to endDay
18%9%46%6%3335%6%32%
1620
December1st to 15thDay
21%14%48%5%2333425%
1569
16th to endDay
20%16%5%9%424346%21%
1536
January1st to 15thNight
19%12%48%6%2444427%
2506
16th to endNight
16%13%6%8%6%34335%27%
2642
February1st to 15thNight
16%12%5%7%5%24346%31%
2106
16th to endNight
15%10%5%9%6%24445%30%
1893
March1st to 15thNight
17%9%37%5%2435%6%33%
2145
16th to endNight
16%8%46%6%2435%7%34%
2061
April1st to 15thNight
15%7%345%3445%6%39%
1797
16th to endNight
17%5%14424447%41%
1693
May1st to 15thNight
20%7%35%5%3445%7%32%
1619
16th to endNight
11%5%25%435%5%5%9%40%
1640
June1st to 15thNight
8%5%25%42345%8%48%
1440
16th to endNight
7%325%5%35%5%6%9%45%
1440
July1st to 15thNight
9%323435%5%6%8%47%
1440
16th to endNight
5%2244236%5%9%55%
1561
August1st to 15thNight
6%3144235%7%10%50%
1620
16th to endNight
6%2145%245%6%7%52%
1908
September1st to 15thNight
10%42442335%7%50%
1832
16th to endNight
10%424324448%49%
1815
October1st to 15thNight
11%32433345%7%50%
1815
16th to endNight
18%6%34423346%42%
2264
November1st to 15thNight
12%7%24323446%47%
2276
16th to endNight
19%10%46%423347%34%
2340
December1st to 15thNight
20%12%6%8%6%2333426%
2388
16th to endNight
24%13%5%6%6%33435%23%
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
62%38%16%8%
1433
16th to endDay
60%413%16%5%
1581
February1st to 15thDay
59%410%16%8%
1746
16th to endDay
58%410%19%5%
1580
March1st to 15thDay
57%5%11%18%6%
1815
16th to endDay
53%5%13%20%5%1
2172
April1st to 15thDay
48%5%11%22%11%1
2151
16th to endDay
48%411%19%11%4
2265
May1st to 15thDay
54%5%11%18%9%
2331
16th to endDay
42%8%11%18%15%2
2475
June1st to 15thDay
38%6%12%23%17%1
2520
16th to endDay
38%5%13%21%16%3
2520
July1st to 15thDay
41%6%11%20%17%2
2371
16th to endDay
33%8%18%24%12%2
2444
August1st to 15thDay
34%8%12%24%17%1
2327
16th to endDay
36%8%9%24%14%6%
2293
September1st to 15thDay
38%6%9%22%18%4
2035
16th to endDay
36%48%24%23%1
1815
October1st to 15thDay
39%5%9%25%17%2
1815
16th to endDay
45%5%11%23%12%
1604
November1st to 15thDay
38%311%22%19%4
1582
16th to endDay
53%310%21%9%
1620
December1st to 15thDay
62%410%16%6%
1569
16th to endDay
64%410%15%3
1536
January1st to 15thNight
59%47%18%9%
2506
16th to endNight
60%411%17%6%
2642
February1st to 15thNight
55%313%17%8%
2115
16th to endNight
55%412%19%7%
1893
March1st to 15thNight
50%5%11%20%9%2
2145
16th to endNight
50%5%11%23%7%1
2061
April1st to 15thNight
44%411%22%15%2
1797
16th to endNight
42%5%10%21%13%7%
1693
May1st to 15thNight
50%6%11%19%10%1
1620
16th to endNight
40%6%12%21%15%4
1642
June1st to 15thNight
32%6%10%27%21%2
1440
16th to endNight
33%8%13%22%18%4
1440
July1st to 15thNight
32%7%13%21%19%4
1360
16th to endNight
24%6%13%33%18%3
1461
August1st to 15thNight
28%7%14%23%23%2
1609
16th to endNight
28%5%13%24%21%6%
1908
September1st to 15thNight
32%5%9%23%22%6%
1832
16th to endNight
33%5%8%23%25%4
1815
October1st to 15thNight
32%5%11%23%23%3
1815
16th to endNight
44%310%26%13%1
2264
November1st to 15thNight
37%38%22%22%5%
2276
16th to endNight
51%210%23%11%
2340
December1st to 15thNight
62%39%16%8%
2388
16th to endNight
64%310%14%6%
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
31%20%28%16%21
90
16th to endDay
21%21%36%16%3
96
February1st to 15thDay
21%31%30%14%3
90
16th to endDay
17%14%41%20%4
81
March1st to 15thDay
30%20%33%14%1
105
16th to endDay
23%14%32%19%9%1
288
April1st to 15thDay
21%15%28%21%11%1
270
16th to endDay
22%8%30%21%12%5%
270
May1st to 15thDay
27%8%31%17%10%4
288
16th to endDay
15%7%30%20%16%10%
371
June1st to 15thDay
12%326%33%17%5%
495
16th to endDay
12%8%30%26%14%7%
495
July1st to 15thDay
13%326%28%18%10%
475
16th to endDay
6%216%31%26%16%
467
August1st to 15thDay
12%112%21%30%21%
313
16th to endDay
9%214%24%32%16%
332
September1st to 15thDay
11%5%13%28%28%13%
299
16th to endDay
17%5%12%22%27%13%
254
October1st to 15thDay
12%7%20%32%20%7%
255
16th to endDay
17%11%45%23%
110
November1st to 15thDay
11%11%23%20%27%6%
90
16th to endDay
28%11%35%17%6%
90
December1st to 15thDay
18%23%33%17%5%1
90
16th to endDay
25%32%34%7%1
96
January1st to 15thNight
26%14%36%19%3
900
16th to endNight
23%15%32%24%3
914
February1st to 15thNight
23%14%34%25%2
704
16th to endNight
22%11%37%24%4
631
March1st to 15thNight
21%13%34%24%5%
720
16th to endNight
21%10%33%26%6%1
717
April1st to 15thNight
17%12%33%25%9%
539
16th to endNight
19%6%35%26%10%1
540
May1st to 15thNight
21%7%31%27%11%
540
16th to endNight
12%325%34%20%2
563
June1st to 15thNight
10%222%45%17%
540
16th to endNight
9%224%39%23%1
540
July1st to 15thNight
9%120%38%28%2
510
16th to endNight
6%114%38%34%4
564
August1st to 15thNight
6%116%38%31%5%
539
16th to endNight
6%13%32%40%5%
573
September1st to 15thNight
11%315%34%29%4
595
16th to endNight
13%317%30%31%3
657
October1st to 15thNight
13%7%22%32%18%5%
660
16th to endNight
23%9%35%23%7%
704
November1st to 15thNight
16%9%31%27%13%1
700
16th to endNight
24%13%29%23%8%
720
December1st to 15thNight
27%11%31%20%7%
768
16th to endNight
32%10%32%18%5%
960
Page generated at 2017-09-13 07:39:23. Version ac04

Copyright 2017 A. Danko


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