Garden of he Gods Recreation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Garden of he Gods Recreation Area clear sky chart from 2005-11-05 to 2017-08-12.

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
39%
15623
22%
46475
14%
15577
48%
15577
26%
29200

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
21%
900
20%
2506
8%
895
31%
895
19%
1728
January16th to endNight
20%
960
19%
2541
6%
960
30%
960
20%
1766
February1st to 15thNight
18%
714
18%
2122
5%
711
29%
711
16%
1476
February16th to endNight
19%
631
19%
1893
5%
631
31%
631
18%
1270
March1st to 15thNight
21%
720
17%
2160
7%
720
29%
720
18%
1475
March16th to endNight
30%
609
17%
2005
9%
609
40%
609
20%
1331
April1st to 15thNight
30%
539
23%
1797
12%
539
46%
539
26%
1056
April16th to endNight
37%
540
22%
1800
16%
540
49%
540
24%
1122
May1st to 15thNight
39%
539
19%
1636
11%
539
47%
539
25%
1073
May16th to endNight
52%
563
20%
1600
14%
561
57%
561
31%
1005
June1st to 15thNight
62%
540
22%
1440
15%
540
66%
540
41%
850
June16th to endNight
64%
540
24%
1440
17%
540
68%
540
43%
826
July1st to 15thNight
65%
510
19%
1360
15%
510
67%
510
38%
833
July16th to endNight
72%
564
25%
1422
20%
531
76%
531
45%
803
August1st to 15thNight
78%
527
23%
1750
27%
524
80%
524
43%
887
August16th to endNight
68%
525
24%
1750
27%
525
73%
525
36%
961
September1st to 15thNight
63%
503
29%
1658
28%
503
69%
503
33%
948
September16th to endNight
55%
657
28%
1815
20%
657
60%
657
35%
1090
October1st to 15thNight
51%
660
31%
1875
22%
660
59%
660
35%
1092
October16th to endNight
34%
704
27%
2183
17%
704
46%
704
28%
1328
November1st to 15thNight
40%
700
31%
2276
22%
700
53%
700
32%
1259
November16th to endNight
31%
720
24%
2340
16%
720
42%
720
23%
1423
December1st to 15thNight
25%
798
17%
2418
9%
798
34%
798
18%
1672
December16th to endNight
19%
960
18%
2688
5%
960
30%
960
17%
1926

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
12%6%25%5%25%45%7%41%
47509
Night
13%6%24424446%45%
46653
TransparencyDay
41%5%11%23%15%2
47189
Night
39%410%24%17%3
46477
SeeingDay
14%10%24%24%17%8%
5626
Night
17%12%25%26%15%2
15624

By Month

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%9%47%5%22445%34%
1432
16th to endDay
12%10%47%5%24445%37%
1683
February1st to 15thDay
14%11%47%423335%38%
1738
16th to endDay
12%9%5%6%6%345%5%6%35%
1580
March1st to 15thDay
19%7%36%424435%36%
1800
16th to endDay
17%8%35%5%345%47%33%
2227
April1st to 15thDay
12%6%25%5%2445%6%44%
2151
16th to endDay
17%6%26%5%24446%39%
2160
May1st to 15thDay
18%5%25%5%26%5%6%7%35%
2313
16th to endDay
10%5%25%6%36%5%6%9%37%
2511
June1st to 15thDay
8%325%426%5%5%9%46%
2520
16th to endDay
5%3245%36%5%8%11%43%
2520
July1st to 15thDay
10%425%5%35%5%7%8%41%
2520
16th to endDay
4314436%7%7%11%43%
2648
August1st to 15thDay
7%325%5%35%6%6%11%42%
2112
16th to endDay
7%414336%5%6%11%44%
2100
September1st to 15thDay
10%5%35%6%35%5%47%41%
1961
16th to endDay
12%5%135%23347%48%
1815
October1st to 15thDay
11%425%423346%51%
1752
16th to endDay
16%413223346%50%
1689
November1st to 15thDay
11%425%424445%49%
1582
16th to endDay
19%7%2441333444%
1620
December1st to 15thDay
19%10%35%424345%36%
1539
16th to endDay
18%11%445%23345%36%
1536
January1st to 15thNight
17%8%37%6%23335%38%
2506
16th to endNight
15%7%45%5%2445%5%39%
2541
February1st to 15thNight
16%10%46%5%2334437%
2113
16th to endNight
14%7%37%6%34446%38%
1893
March1st to 15thNight
17%8%35%42433440%
2160
16th to endNight
18%6%244345%47%38%
2005
April1st to 15thNight
13%5%1442445%6%47%
1797
16th to endNight
17%5%25%424346%42%
1800
May1st to 15thNight
15%6%25%5%33347%41%
1636
16th to endNight
7%325%5%45%6%5%11%43%
1599
June1st to 15thNight
7%32332447%7%52%
1440
16th to endNight
42134346%7%12%49%
1440
July1st to 15thNight
8%42442346%8%50%
1440
16th to endNight
5%214425%47%9%52%
1518
August1st to 15thNight
431233346%9%57%
1762
16th to endNight
6%31442446%8%53%
1750
September1st to 15thNight
10%5%2433435%6%51%
1658
16th to endNight
11%414424347%52%
1815
October1st to 15thNight
11%5%24323336%53%
1875
16th to endNight
16%6%2442323450%
2183
November1st to 15thNight
11%314323447%53%
2276
16th to endNight
17%5%24424235%47%
2340
December1st to 15thNight
20%9%35%323345%36%
2418
16th to endNight
19%10%46%424335%35%
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
51%39%22%10%1
1433
16th to endDay
47%311%27%8%
1683
February1st to 15thDay
49%310%24%9%1
1740
16th to endDay
49%313%20%11%1
1580
March1st to 15thDay
51%38%22%12%1
1800
16th to endDay
49%5%15%21%7%
2228
April1st to 15thDay
40%411%24%17%2
2151
16th to endDay
46%410%25%12%1
2160
May1st to 15thDay
47%7%11%21%11%
2313
16th to endDay
41%8%14%19%12%2
2515
June1st to 15thDay
33%6%13%26%18%2
2520
16th to endDay
30%8%14%22%20%3
2520
July1st to 15thDay
38%6%12%23%14%4
2371
16th to endDay
30%9%17%26%13%2
2481
August1st to 15thDay
34%7%12%26%16%2
2100
16th to endDay
31%6%14%24%18%4
2100
September1st to 15thDay
38%5%11%21%17%4
1961
16th to endDay
35%46%23%24%4
1815
October1st to 15thDay
34%38%26%21%5%
1752
16th to endDay
35%37%29%19%4
1689
November1st to 15thDay
34%48%20%22%7%
1582
16th to endDay
44%27%27%15%2
1620
December1st to 15thDay
51%212%20%10%1
1539
16th to endDay
51%212%21%9%1
1536
January1st to 15thNight
48%38%22%15%1
2506
16th to endNight
46%412%22%12%1
2541
February1st to 15thNight
51%28%23%11%1
2122
16th to endNight
47%311%22%13%1
1893
March1st to 15thNight
48%39%18%16%4
2160
16th to endNight
45%5%13%22%11%1
2005
April1st to 15thNight
36%410%26%18%4
1797
16th to endNight
41%37%25%17%3
1800
May1st to 15thNight
41%6%10%25%14%1
1637
16th to endNight
34%7%15%21%16%4
1601
June1st to 15thNight
28%5%14%26%22%2
1440
16th to endNight
26%5%16%24%22%5%
1440
July1st to 15thNight
31%5%13%26%15%6%
1360
16th to endNight
24%6%16%33%16%3
1422
August1st to 15thNight
22%5%17%26%24%3
1750
16th to endNight
28%6%11%26%20%6%
1750
September1st to 15thNight
33%47%27%19%6%
1658
16th to endNight
33%48%22%23%8%
1815
October1st to 15thNight
32%37%23%25%6%
1875
16th to endNight
38%35%26%19%6%
2183
November1st to 15thNight
31%38%23%24%8%
2276
16th to endNight
40%28%25%19%2
2340
December1st to 15thNight
50%39%20%13%1
2418
16th to endNight
52%39%19%11%1
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
33%26%26%8%4
90
16th to endDay
17%43%31%6%1
96
February1st to 15thDay
18%40%30%10%1
90
16th to endDay
25%25%32%14%1
81
March1st to 15thDay
31%30%25%11%2
90
16th to endDay
21%16%36%20%5%
235
April1st to 15thDay
16%20%32%19%8%1
270
16th to endDay
22%10%29%22%12%1
270
May1st to 15thDay
21%14%31%18%9%3
288
16th to endDay
15%8%30%22%13%9%
411
June1st to 15thDay
11%422%29%23%8%
495
16th to endDay
5%6%28%37%15%6%
495
July1st to 15thDay
12%324%32%17%10%
475
16th to endDay
5%113%31%33%14%
512
August1st to 15thDay
11%312%23%28%20%
297
16th to endDay
13%11%26%32%16%
268
September1st to 15thDay
9%315%23%29%18%
255
16th to endDay
15%6%11%24%27%14%
254
October1st to 15thDay
10%6%29%23%20%8%
192
16th to endDay
15%11%38%25%9%
96
November1st to 15thDay
6%15%34%21%22%
90
16th to endDay
34%21%25%13%5%
90
December1st to 15thDay
12%22%43%13%44
90
16th to endDay
30%28%36%41
96
January1st to 15thNight
22%24%28%20%3
900
16th to endNight
21%23%32%20%2
960
February1st to 15thNight
21%23%32%20%2
714
16th to endNight
19%23%34%21%1
631
March1st to 15thNight
21%18%35%21%3
720
16th to endNight
22%11%30%24%9%
609
April1st to 15thNight
15%17%33%21%10%
539
16th to endNight
21%9%26%28%12%
540
May1st to 15thNight
18%7%28%30%12%1
540
16th to endNight
8%425%33%24%2
563
June1st to 15thNight
10%219%37%27%3
540
16th to endNight
5%220%42%26%2
540
July1st to 15thNight
10%212%36%33%4
510
16th to endNight
6%111%31%36%11%
564
August1st to 15thNight
6%9%32%42%8%
527
16th to endNight
8%212%31%40%5%
525
September1st to 15thNight
11%413%26%34%9%
503
16th to endNight
14%5%19%24%28%8%
657
October1st to 15thNight
13%8%21%28%23%5%
660
16th to endNight
20%11%30%24%12%1
704
November1st to 15thNight
14%14%27%26%15%1
700
16th to endNight
20%19%26%23%10%
720
December1st to 15thNight
26%17%26%20%7%
798
16th to endNight
26%20%29%19%4
960
Page generated at 2017-08-13 13:16:53. Version ac04

Copyright 2017 A. Danko


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