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 2017-12-20.

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
40%
16124
22%
48018
14%
16078
48%
16078
27%
30110

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
77%
539
23%
1788
26%
536
78%
536
42%
920
August16th to endNight
68%
573
25%
1910
27%
573
73%
573
35%
1056
September1st to 15thNight
63%
549
28%
1809
27%
549
68%
549
33%
1033
September16th to endNight
58%
717
31%
1980
23%
717
62%
717
37%
1168
October1st to 15thNight
50%
720
30%
2046
21%
720
58%
720
34%
1204
October16th to endNight
34%
768
28%
2382
18%
768
47%
768
29%
1443
November1st to 15thNight
38%
760
29%
2471
21%
760
51%
760
30%
1406
November16th to endNight
32%
780
26%
2535
18%
780
44%
780
24%
1513
December1st to 15thNight
26%
865
18%
2620
9%
865
36%
865
19%
1775
December16th to endNight
18%
984
18%
2755
5%
984
30%
984
17%
1978

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%
48834
Night
13%6%25%424446%45%
48196
TransparencyDay
40%5%11%24%15%2
48514
Night
39%410%24%17%3
48020
SeeingDay
14%10%24%24%17%8%
6075
Night
17%12%25%26%16%2
16125

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%315%5%35%6%6%11%42%
2160
16th to endDay
7%414435%5%7%11%44%
2292
September1st to 15thDay
11%5%345%35%5%47%43%
2139
16th to endDay
11%4135%2335%7%50%
1980
October1st to 15thDay
11%5%25%423346%50%
1911
16th to endDay
15%414323346%50%
1842
November1st to 15thDay
12%425%424445%48%
1717
16th to endDay
18%7%23413335%45%
1755
December1st to 15thDay
17%9%35%424345%37%
1667
16th to endDay
18%11%45%5%23335%36%
1568
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%56%
1800
16th to endNight
6%41442446%8%52%
1910
September1st to 15thNight
11%5%2433335%6%51%
1809
16th to endNight
10%314414346%54%
1980
October1st to 15thNight
10%5%24423346%52%
2046
16th to endNight
15%6%2442323450%
2382
November1st to 15thNight
12%414323447%51%
2471
16th to endNight
16%5%24424235%49%
2535
December1st to 15thNight
19%9%35%323345%38%
2620
16th to endNight
19%10%46%424335%35%
2755

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%13%26%15%2
2148
16th to endDay
32%6%14%23%18%4
2292
September1st to 15thDay
38%5%10%23%17%4
2139
16th to endDay
33%5%7%25%23%4
1980
October1st to 15thDay
35%39%25%20%5%
1911
16th to endDay
35%37%29%20%4
1842
November1st to 15thDay
36%48%21%21%7%
1717
16th to endDay
42%27%28%16%2
1755
December1st to 15thDay
49%312%21%12%1
1667
16th to endDay
52%212%21%9%1
1568
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
23%5%17%26%23%3
1788
16th to endNight
28%6%12%25%20%5%
1910
September1st to 15thNight
33%47%28%19%6%
1809
16th to endNight
31%48%24%23%7%
1980
October1st to 15thNight
33%37%23%25%6%
2046
16th to endNight
38%35%26%20%6%
2382
November1st to 15thNight
33%38%22%23%7%
2471
16th to endNight
39%28%25%21%2
2535
December1st to 15thNight
48%39%21%14%1
2620
16th to endNight
52%39%20%11%1
2755

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%313%24%28%19%
313
16th to endDay
13%13%28%30%12%
332
September1st to 15thDay
11%416%22%27%17%
315
16th to endDay
12%5%13%23%30%15%
314
October1st to 15thDay
13%6%30%25%17%6%
246
16th to endDay
16%14%38%22%7%
144
November1st to 15thDay
13%19%32%18%16%
135
16th to endDay
26%19%30%18%5%
135
December1st to 15thDay
9%30%37%14%5%3
135
16th to endDay
31%29%34%3
108
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
7%9%32%41%8%
539
16th to endNight
8%212%31%39%5%
573
September1st to 15thNight
12%5%12%27%33%8%
549
16th to endNight
13%418%24%30%8%
717
October1st to 15thNight
13%7%21%29%22%5%
720
16th to endNight
19%11%31%23%12%1
768
November1st to 15thNight
15%14%27%26%15%
760
16th to endNight
18%19%26%24%11%
780
December1st to 15thNight
24%18%26%22%7%
865
16th to endNight
26%20%29%19%3
984
Page generated at 2017-12-21 06:04:56. Version ac04

Copyright 2017 A. Danko


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