Royal Gorge Resort
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Royal Gorge Resort clear sky chart from 2005-11-05 to 2017-09-20.

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
51%
15207
15%
46865
14%
15178
54%
15178
24%
30947

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
37%
716
9%
2506
7%
716
40%
716
12%
1911
January16th to endNight
46%
768
13%
2680
14%
768
48%
768
14%
1986
February1st to 15thNight
33%
700
5%
2285
4%
696
35%
696
12%
1777
February16th to endNight
36%
632
10%
1895
9%
632
39%
632
15%
1419
March1st to 15thNight
41%
720
9%
2097
7%
720
44%
720
18%
1537
March16th to endNight
42%
768
11%
2112
7%
768
45%
768
21%
1539
April1st to 15thNight
45%
677
11%
1769
6%
677
47%
677
22%
1281
April16th to endNight
48%
540
13%
1620
10%
540
50%
540
24%
1068
May1st to 15thNight
55%
539
15%
1619
14%
539
57%
539
27%
1019
May16th to endNight
56%
441
10%
1517
11%
441
58%
441
18%
1052
June1st to 15thNight
61%
360
13%
1260
16%
360
64%
360
25%
795
June16th to endNight
70%
360
23%
1260
28%
360
75%
360
40%
625
July1st to 15thNight
84%
340
19%
1318
29%
340
87%
340
47%
550
July16th to endNight
84%
378
29%
1418
41%
356
86%
356
53%
549
August1st to 15thNight
75%
539
26%
1611
24%
536
76%
536
47%
809
August16th to endNight
75%
585
33%
1731
26%
585
77%
585
51%
847
September1st to 15thNight
74%
720
27%
1902
20%
720
77%
720
53%
1024
September16th to endNight
67%
675
29%
1869
24%
675
69%
675
40%
1071
October1st to 15thNight
58%
660
24%
1886
19%
660
62%
660
33%
1150
October16th to endNight
53%
704
18%
2249
17%
704
55%
704
25%
1457
November1st to 15thNight
47%
700
18%
2275
17%
700
50%
700
23%
1507
November16th to endNight
42%
840
12%
2460
9%
840
44%
840
21%
1716
December1st to 15thNight
38%
900
7%
2661
5%
900
39%
900
15%
2028
December16th to endNight
33%
945
9%
2865
6%
945
35%
945
13%
2230

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
3436%7%46%7%7%9%39%
47980
Night
25%36%6%47%7%7%9%38%
47036
Cloud CoverDay
5%7%37%6%36%6%6%8%38%
47981
Night
48%37%6%35%5%7%9%37%
47038
TransparencyDay
39%11%13%17%12%5%
47654
Night
38%10%14%19%11%4
46866
SeeingDay
9%16%32%27%12%2
5699
Night
7%8%24%37%19%2
15217

By Month

Percentage Cloud Cover NW (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
449%10%7%8%9%10%11%21%
1432
16th to endDay
5%49%9%8%9%9%10%14%17%
1542
February1st to 15thDay
5%38%9%9%13%10%9%10%19%
1577
16th to endDay
45%10%10%6%10%11%11%11%18%
1579
March1st to 15thDay
3436%9%48%10%9%13%25%
1863
16th to endDay
36%38%8%6%9%8%9%12%24%
2111
April1st to 15thDay
25%47%7%6%9%8%8%12%25%
2176
16th to endDay
36%36%7%46%6%8%10%35%
2340
May1st to 15thDay
35%36%6%45%6%6%9%42%
2331
16th to endDay
6%9%39%8%46%8%6%8%29%
2593
June1st to 15thDay
8%5%27%6%37%5%7%8%36%
2700
16th to endDay
331442446%7%57%
2700
July1st to 15thDay
3213435%6%7%8%53%
2558
16th to endDay
2213435%45%5%61%
2654
August1st to 15thDay
32135%35%6%7%9%50%
2340
16th to endDay
221332345%6%63%
2468
September1st to 15thDay
431342335%5%62%
2058
16th to endDay
6%42442445%9%51%
1860
October1st to 15thDay
6%6%35%6%36%5%5%8%43%
1744
16th to endDay
3436%6%45%6%8%10%40%
1620
November1st to 15thDay
25%36%7%5%6%7%8%10%35%
1584
16th to endDay
145%8%8%5%6%8%11%10%28%
1486
December1st to 15thDay
16%410%12%7%12%9%9%8%17%
1296
16th to endDay
17%411%12%5%9%9%11%9%17%
1368
January1st to 15thNight
16%411%11%6%10%9%8%10%19%
2506
16th to endNight
17%410%10%6%12%11%10%9%16%
2680
February1st to 15thNight
26%412%13%7%11%10%7%8%15%
2274
16th to endNight
5%5%9%9%5%10%10%8%13%21%
1895
March1st to 15thNight
2448%7%6%9%9%10%13%25%
2097
16th to endNight
35%37%6%47%7%8%11%34%
2109
April1st to 15thNight
46%46%7%47%6%8%12%31%
1769
16th to endNight
36%37%6%35%5%5%9%41%
1620
May1st to 15thNight
3426%5%35%5%5%10%48%
1619
16th to endNight
6%8%25%5%26%6%7%11%36%
1517
June1st to 15thNight
7%5%25%425%46%7%47%
1260
16th to endNight
3213323448%62%
1260
July1st to 15thNight
1122245%6%10%63%
1398
16th to endNight
112213235%74%
1514
August1st to 15thNight
22232446%9%60%
1620
16th to endNight
2213213447%65%
1731
September1st to 15thNight
321231235%5%66%
1902
16th to endNight
4323424446%58%
1869
October1st to 15thNight
5%5%234236%5%9%50%
1886
16th to endNight
35%25%446%5%5%7%46%
2249
November1st to 15thNight
27%36%5%35%7%8%10%39%
2275
16th to endNight
25%45%7%5%8%8%9%12%31%
2460
December1st to 15thNight
15%49%9%6%10%9%10%10%21%
2661
16th to endNight
28%411%10%6%10%9%9%8%17%
2865

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
28%410%11%5%8%6%8%11%21%
1432
16th to endDay
310%6%10%7%5%7%7%7%12%22%
1542
February1st to 15thDay
38%5%8%9%5%10%8%9%10%20%
1577
16th to endDay
28%6%9%10%6%9%8%7%11%20%
1579
March1st to 15thDay
49%48%7%48%8%8%11%25%
1863
16th to endDay
49%49%9%46%7%8%9%24%
2112
April1st to 15thDay
49%48%7%5%7%6%8%9%26%
2176
16th to endDay
5%8%48%7%37%5%5%7%35%
2340
May1st to 15thDay
5%7%36%6%35%6%7%9%37%
2331
16th to endDay
8%10%5%9%8%46%6%5%7%26%
2593
June1st to 15thDay
11%7%36%6%35%5%7%8%33%
2700
16th to endDay
5%32443445%6%55%
2700
July1st to 15thDay
33135%25%6%6%8%53%
2558
16th to endDay
3213425%346%61%
2654
August1st to 15thDay
3335%45%6%7%7%52%
2340
16th to endDay
2323324447%61%
2468
September1st to 15thDay
5%413313445%61%
2058
16th to endDay
7%5%235%2335%8%50%
1860
October1st to 15thDay
8%6%37%5%345%6%7%41%
1744
16th to endDay
6%8%37%5%35%6%6%9%37%
1620
November1st to 15thDay
6%9%48%6%25%6%5%9%34%
1584
16th to endDay
311%5%9%8%346%8%10%27%
1486
December1st to 15thDay
311%6%13%9%6%9%6%7%7%16%
1296
16th to endDay
310%7%12%9%5%8%8%7%7%17%
1368
January1st to 15thNight
312%5%9%9%5%8%7%8%10%18%
2506
16th to endNight
410%5%9%8%47%8%9%12%19%
2680
February1st to 15thNight
413%5%11%9%47%8%8%11%15%
2274
16th to endNight
28%6%11%10%47%8%8%11%20%
1895
March1st to 15thNight
29%5%8%7%47%6%9%11%27%
2097
16th to endNight
49%48%6%46%6%7%10%31%
2112
April1st to 15thNight
5%10%48%5%36%6%6%12%30%
1769
16th to endNight
5%9%46%6%45%45%8%39%
1620
May1st to 15thNight
5%6%35%4245%6%9%46%
1619
16th to endNight
8%9%36%4346%8%10%34%
1516
June1st to 15thNight
10%6%2343346%7%44%
1260
16th to endNight
4413223347%61%
1260
July1st to 15thNight
11122145%6%9%62%
1398
16th to endNight
112222336%73%
1514
August1st to 15thNight
221332346%8%61%
1620
16th to endNight
221231345%7%65%
1731
September1st to 15thNight
5%313113345%66%
1902
16th to endNight
6%5%2442335%5%56%
1869
October1st to 15thNight
7%7%243245%5%9%48%
1886
16th to endNight
8%8%25%6%3445%7%42%
2249
November1st to 15thNight
6%9%46%5%35%47%9%36%
2275
16th to endNight
49%48%6%36%5%8%11%30%
2460
December1st to 15thNight
49%410%10%5%7%7%8%11%20%
2661
16th to endNight
413%7%11%9%5%7%6%6%9%18%
2865

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
49%15%15%13%5%1
1432
16th to endDay
49%12%13%17%42
1542
February1st to 15thDay
52%13%16%12%5%
1577
16th to endDay
52%14%15%12%3
1579
March1st to 15thDay
45%17%18%12%5%
1863
16th to endDay
51%15%15%15%2
2112
April1st to 15thDay
50%14%17%14%3
2176
16th to endDay
44%12%16%19%7%
2340
May1st to 15thDay
39%10%16%24%8%
2331
16th to endDay
53%12%14%12%5%
2597
June1st to 15thDay
44%10%14%18%9%2
2700
16th to endDay
25%8%9%22%26%7%
2700
July1st to 15thDay
24%8%10%18%22%15%
2409
16th to endDay
21%47%12%26%27%
2487
August1st to 15thDay
26%9%9%17%24%13%
2325
16th to endDay
21%6%9%20%28%14%
2468
September1st to 15thDay
23%6%8%19%31%10%
2058
16th to endDay
30%7%11%26%21%3
1860
October1st to 15thDay
39%9%14%23%10%2
1744
16th to endDay
38%13%14%23%9%
1620
November1st to 15thDay
43%12%15%18%7%2
1584
16th to endDay
45%12%15%15%7%2
1486
December1st to 15thDay
58%13%14%10%3
1296
16th to endDay
56%12%14%11%3
1368
January1st to 15thNight
53%13%13%13%41
2506
16th to endNight
51%11%10%17%6%2
2680
February1st to 15thNight
57%9%16%11%4
2285
16th to endNight
48%14%17%16%21
1895
March1st to 15thNight
43%15%17%16%6%
2097
16th to endNight
42%14%18%19%4
2112
April1st to 15thNight
43%12%19%17%6%
1769
16th to endNight
39%9%19%23%8%
1620
May1st to 15thNight
33%11%16%32%6%
1620
16th to endNight
41%14%18%19%6%
1517
June1st to 15thNight
36%10%14%25%10%2
1260
16th to endNight
22%6%10%25%25%8%
1260
July1st to 15thNight
14%7%12%23%27%15%
1318
16th to endNight
14%35%15%32%28%
1418
August1st to 15thNight
19%6%11%21%24%16%
1611
16th to endNight
16%6%8%24%29%15%
1731
September1st to 15thNight
19%5%11%20%31%11%
1902
16th to endNight
27%5%11%27%22%4
1869
October1st to 15thNight
31%9%15%30%12%1
1886
16th to endNight
37%10%14%23%14%
2249
November1st to 15thNight
39%11%16%22%8%2
2275
16th to endNight
41%12%16%18%8%2
2460
December1st to 15thNight
49%14%19%12%3
2661
16th to endNight
55%11%14%13%4
2865

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
6%135%33%18%5%
60
16th to endDay
6%10%44%26%12%
65
February1st to 15thDay
6%19%36%17%17%2
92
16th to endDay
225%37%24%9%
238
March1st to 15thDay
10%22%41%21%4
270
16th to endDay
7%27%44%17%3
288
April1st to 15thDay
7%26%32%21%8%2
269
16th to endDay
9%27%32%22%6%1
270
May1st to 15thDay
11%21%35%22%9%
288
16th to endDay
16%16%24%26%12%4
375
June1st to 15thDay
15%12%26%29%13%3
495
16th to endDay
7%11%27%28%22%2
495
July1st to 15thDay
6%11%25%36%17%2
343
16th to endDay
6%14%37%29%10%2
327
August1st to 15thDay
5%8%33%36%12%3
315
16th to endDay
6%8%32%30%15%6%
332
September1st to 15thDay
11%15%26%25%16%4
315
16th to endDay
10%14%29%27%14%3
272
October1st to 15thDay
13%20%28%22%14%1
184
16th to endDay
9%19%29%29%9%3
96
November1st to 15thDay
8%430%38%15%2
90
16th to endDay
8%17%37%31%31
90
December1st to 15thDay
12%15%48%15%9%
66
16th to endDay
7%15%32%29%12%1
64
January1st to 15thNight
7%12%29%36%12%2
720
16th to endNight
6%8%26%38%17%1
768
February1st to 15thNight
7%10%34%36%10%1
704
16th to endNight
5%11%35%31%14%1
632
March1st to 15thNight
5%12%32%36%11%1
720
16th to endNight
7%14%27%38%11%
768
April1st to 15thNight
8%9%28%32%18%2
677
16th to endNight
8%8%28%35%16%2
540
May1st to 15thNight
8%8%22%33%23%3
540
16th to endNight
12%5%20%31%27%2
442
June1st to 15thNight
12%218%41%22%1
360
16th to endNight
5%315%40%32%1
360
July1st to 15thNight
227%44%40%2
340
16th to endNight
29%49%35%1
378
August1st to 15thNight
4113%40%38%1
539
16th to endNight
5%211%43%34%2
585
September1st to 15thNight
6%113%37%33%7%
720
16th to endNight
7%6%12%36%31%5%
675
October1st to 15thNight
10%6%21%37%22%2
660
16th to endNight
9%9%20%39%17%3
704
November1st to 15thNight
6%12%28%38%14%
700
16th to endNight
7%13%31%33%12%2
840
December1st to 15thNight
6%11%32%38%9%1
900
16th to endNight
7%12%34%32%11%1
945
Page generated at 2017-09-21 05:18:11. Version ac04

Copyright 2017 A. Danko


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