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 2005-11-06 to 2024-02-25.

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
49%
23575
15%
80681
14%
23504
52%
23504
21%
53500

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 10thNight
36%
744
7%
4378
7%
736
40%
736
7%
3238
January11th to 20thNight
38%
754
12%
4375
12%
740
43%
740
8%
3223
January21st to endNight
38%
830
7%
4813
11%
814
44%
814
7%
3784
February1st to 10thNight
27%
760
7%
2470
4%
760
32%
760
12%
1915
February11th to 20thNight
33%
744
9%
2306
6%
740
37%
740
15%
1700
February21st to endNight
37%
610
13%
1829
11%
610
42%
610
17%
1343
March1st to 10thNight
36%
720
10%
2156
8%
720
40%
720
18%
1572
March11th to 20thNight
46%
720
13%
1980
10%
720
50%
720
23%
1376
March21st to endNight
40%
792
10%
2178
5%
792
42%
792
18%
1665
April1st to 10thNight
44%
720
14%
1818
7%
720
47%
720
23%
1303
April11th to 20thNight
40%
561
13%
1629
8%
561
43%
561
20%
1140
April21st to endNight
48%
540
12%
1620
9%
540
50%
540
23%
1085
May1st to 10thNight
56%
540
14%
1620
12%
540
57%
540
26%
1038
May11th to 20thNight
53%
531
12%
1595
12%
531
54%
531
24%
1061
May21st to endNight
52%
404
9%
1499
10%
404
55%
404
16%
1060
June1st to 10thNight
62%
360
14%
1260
16%
360
65%
360
23%
798
June11th to 20thNight
51%
360
18%
1260
17%
360
59%
360
27%
755
June21st to endNight
72%
360
25%
1260
31%
360
77%
360
42%
615
July1st to 10thNight
79%
350
20%
1337
32%
350
82%
350
46%
564
July11th to 20thNight
80%
348
27%
1392
37%
348
87%
348
56%
517
July21st to endNight
81%
396
31%
1490
41%
374
84%
374
49%
606
August1st to 10thNight
67%
537
25%
1602
23%
534
69%
534
41%
842
August11th to 20thNight
79%
534
34%
1602
29%
534
80%
534
57%
733
August21st to endNight
70%
612
32%
1800
24%
612
72%
612
45%
933
September1st to 10thNight
71%
720
30%
1862
20%
720
75%
720
56%
988
September11th to 20thNight
71%
720
29%
1980
24%
720
74%
720
44%
1107
September21st to endNight
63%
720
30%
1980
24%
720
68%
720
44%
1111
October1st to 10thNight
59%
720
21%
2005
17%
720
62%
720
33%
1234
October11th to 20thNight
56%
720
25%
2186
21%
720
60%
720
32%
1309
October21st to endNight
48%
792
19%
2574
16%
792
54%
792
25%
1627
November1st to 10thNight
46%
740
18%
2405
18%
740
49%
740
23%
1575
November11th to 20thNight
40%
760
15%
2470
12%
760
45%
760
20%
1690
November21st to endNight
44%
950
14%
2660
10%
950
47%
950
26%
1778
December1st to 10thNight
39%
950
11%
2788
7%
950
42%
950
18%
2018
December11th to 20thNight
34%
949
10%
3409
6%
949
36%
949
12%
2553
December21st to endNight
27%
1007
5%
5093
4%
1003
31%
1003
7%
3644

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
5%8%48%7%46%6%7%9%38%
78142
Night
5%9%49%8%46%6%6%9%34%
81155
TransparencyDay
38%12%13%18%13%6%
77846
Night
39%12%14%19%12%4
80973
SeeingDay
8%17%33%28%12%2
13978
Night
7%9%26%38%18%2
23620

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 10thDay
110%8%13%13%8%10%8%7%8%14%
2539
11th to 20thDay
210%6%12%11%5%6%6%7%11%26%
2540
21st to endDay
49%6%15%12%7%6%7%8%10%14%
2804
February1st to 10thDay
311%6%10%9%5%9%7%9%9%21%
1710
11th to 20thDay
210%6%9%9%5%8%8%8%9%26%
1761
21st to endDay
29%6%11%9%6%9%7%8%11%21%
1521
March1st to 10thDay
48%49%9%5%7%8%8%11%26%
1803
11th to 20thDay
5%10%5%9%7%47%8%9%10%27%
1980
21st to endDay
410%5%11%10%5%7%6%9%9%25%
2178
April1st to 10thDay
410%5%10%8%5%7%6%8%10%28%
2138
11th to 20thDay
49%48%6%5%8%6%7%8%35%
2279
21st to endDay
6%10%5%9%7%47%6%5%8%33%
2340
May1st to 10thDay
5%8%37%7%46%7%8%9%35%
2340
11th to 20thDay
7%8%47%7%5%6%6%7%10%34%
2301
21st to endDay
9%12%5%9%9%5%6%7%6%8%26%
2772
June1st to 10thDay
10%7%46%7%36%7%7%9%33%
2700
11th to 20thDay
10%7%36%6%35%46%7%43%
2700
21st to endDay
34244345%6%7%59%
2700
July1st to 10thDay
33135%26%8%7%8%54%
2577
11th to 20thDay
331342445%7%65%
2520
21st to endDay
4324435%5%5%6%59%
2737
August1st to 10thDay
6%414446%6%7%7%50%
2328
11th to 20thDay
231343445%8%64%
2299
21st to endDay
35%233345%5%7%61%
2552
September1st to 10thDay
5%314324446%64%
2098
11th to 20thDay
6%6%245%345%46%55%
1980
21st to endDay
7%6%245%23448%54%
1980
October1st to 10thDay
8%7%38%6%45%6%6%7%42%
1954
11th to 20thDay
6%7%36%5%345%6%10%45%
1769
21st to endDay
5%8%47%5%45%6%6%9%41%
1782
November1st to 10thDay
7%10%48%6%26%5%6%9%37%
1674
11th to 20thDay
5%10%5%8%7%36%6%7%10%32%
1688
21st to endDay
49%49%8%447%9%13%29%
1520
December1st to 10thDay
411%6%10%8%6%9%6%7%10%24%
1387
11th to 20thDay
312%6%13%10%6%8%6%8%10%18%
1685
21st to endDay
28%5%12%14%7%9%8%6%9%17%
2506
January1st to 10thNight
213%6%13%14%9%11%7%6%7%12%
4406
11th to 20thNight
415%7%15%8%5%6%5%7%9%19%
4420
21st to endNight
412%6%15%18%7%7%6%6%7%11%
4849
February1st to 10thNight
313%7%13%10%5%8%7%7%10%18%
2470
11th to 20thNight
312%5%11%10%5%7%8%8%11%20%
2305
21st to endNight
29%6%13%10%5%8%8%8%11%22%
1829
March1st to 10thNight
311%6%10%7%5%6%6%8%12%27%
2156
11th to 20thNight
410%38%6%47%6%8%14%30%
1980
21st to endNight
411%5%9%9%5%6%5%8%10%27%
2178
April1st to 10thNight
5%10%5%9%6%46%6%6%13%31%
1818
11th to 20thNight
6%10%48%6%47%6%7%9%34%
1629
21st to endNight
5%10%5%7%7%45%5%7%11%36%
1620
May1st to 10thNight
6%7%46%5%35%6%8%10%42%
1620
11th to 20thNight
7%6%35%5%446%7%11%40%
1594
21st to endNight
9%11%38%5%35%6%8%9%31%
1499
June1st to 10thNight
9%7%35%5%445%7%9%43%
1260
11th to 20thNight
9%7%25%43445%7%49%
1260
21st to endNight
441432335%8%63%
1260
July1st to 10thNight
32133145%6%8%64%
1377
11th to 20thNight
211221345%6%71%
1440
21st to endNight
2213324446%70%
1578
August1st to 10thNight
44244245%6%8%57%
1611
11th to 20thNight
121232336%8%69%
1602
21st to endNight
42244245%5%7%61%
1800
September1st to 10thNight
5%313223346%67%
1862
11th to 20thNight
6%425%32346%7%58%
1980
21st to endNight
6%5%24434345%61%
1980
October1st to 10thNight
6%7%25%5%345%6%8%49%
2005
11th to 20thNight
8%8%35%42445%9%48%
2186
21st to endNight
9%8%36%6%35%5%6%9%42%
2574
November1st to 10thNight
8%10%47%6%35%5%6%9%37%
2405
11th to 20thNight
6%9%5%8%7%47%7%7%9%31%
2470
21st to endNight
48%48%6%36%7%8%13%34%
2660
December1st to 10thNight
48%410%10%5%8%8%9%12%23%
2788
11th to 20thNight
412%5%11%9%6%8%7%7%12%19%
3506
21st to endNight
311%6%14%14%8%7%7%6%7%16%
5178

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 10thDay
53%18%13%12%4
2539
11th to 20thDay
49%9%16%13%9%3
2540
21st to endDay
53%15%13%15%41
2804
February1st to 10thDay
51%14%15%15%5%
1710
11th to 20thDay
47%15%16%14%8%
1770
21st to endDay
49%16%14%14%7%1
1521
March1st to 10thDay
44%17%17%15%7%
1803
11th to 20thDay
44%16%17%17%6%
1980
21st to endDay
51%16%16%13%3
2178
April1st to 10thDay
47%14%18%16%5%1
2138
11th to 20thDay
41%15%17%18%8%1
2282
21st to endDay
46%12%14%21%6%
2340
May1st to 10thDay
39%14%17%22%8%1
2340
11th to 20thDay
42%13%16%21%7%1
2304
21st to endDay
54%14%14%12%5%1
2773
June1st to 10thDay
43%13%17%21%6%
2700
11th to 20thDay
38%10%10%19%16%6%
2700
21st to endDay
23%9%9%22%29%9%
2700
July1st to 10thDay
21%10%12%19%22%16%
2508
11th to 20thDay
17%5%7%15%26%29%
2445
21st to endDay
23%6%7%12%28%24%
2585
August1st to 10thDay
28%9%10%17%23%12%
2313
11th to 20thDay
18%6%8%23%31%13%
2299
21st to endDay
22%7%9%20%28%15%
2552
September1st to 10thDay
20%6%8%19%29%18%
2098
11th to 20thDay
27%9%10%21%25%8%
1980
21st to endDay
28%6%11%27%25%4
1980
October1st to 10thDay
39%10%12%23%13%3
1954
11th to 20thDay
33%10%15%26%14%2
1769
21st to endDay
35%12%16%24%12%1
1782
November1st to 10thDay
40%13%13%20%12%2
1674
11th to 20thDay
44%12%17%19%7%2
1688
21st to endDay
40%13%16%17%11%3
1520
December1st to 10thDay
50%11%13%14%9%2
1387
11th to 20thDay
48%15%19%13%4
1684
21st to endDay
45%14%14%14%8%5%
2506
January1st to 10thNight
51%17%14%14%3
4406
11th to 20thNight
55%11%10%14%6%4
4420
21st to endNight
56%16%12%12%41
4849
February1st to 10thNight
56%11%15%12%5%
2470
11th to 20thNight
48%13%17%14%8%
2306
21st to endNight
46%14%14%16%8%2
1829
March1st to 10thNight
43%16%17%17%7%
2156
11th to 20thNight
38%14%18%21%9%
1980
21st to endNight
47%15%17%17%4
2178
April1st to 10thNight
42%12%17%20%7%1
1818
11th to 20thNight
42%13%17%19%9%
1629
21st to endNight
39%11%20%22%7%
1620
May1st to 10thNight
32%15%17%30%6%1
1620
11th to 20thNight
35%15%18%24%8%
1595
21st to endNight
46%13%18%18%5%
1499
June1st to 10thNight
36%12%17%27%7%1
1260
11th to 20thNight
34%9%12%21%18%6%
1260
21st to endNight
20%8%10%26%27%10%
1260
July1st to 10thNight
15%8%11%24%29%14%
1337
11th to 20thNight
11%5%8%20%27%30%
1392
21st to endNight
16%5%6%14%34%26%
1490
August1st to 10thNight
24%6%11%20%25%14%
1602
11th to 20thNight
13%7%9%27%29%15%
1602
21st to endNight
19%9%8%22%27%16%
1800
September1st to 10thNight
18%5%10%20%31%17%
1862
11th to 20thNight
23%7%13%22%26%9%
1980
21st to endNight
25%7%9%29%25%6%
1980
October1st to 10thNight
31%10%13%27%17%3
2005
11th to 20thNight
33%7%13%31%14%2
2186
21st to endNight
34%12%16%24%14%1
2574
November1st to 10thNight
39%11%15%22%11%2
2405
11th to 20thNight
41%13%17%21%6%1
2470
21st to endNight
37%12%14%22%12%3
2660
December1st to 10thNight
44%14%19%13%7%2
2788
11th to 20thNight
49%13%16%16%5%
3507
21st to endNight
50%14%13%11%7%5%
5178

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 10thDay
8%13%37%27%13%2
180
11th to 20thDay
6%13%42%24%9%5%
180
21st to endDay
6%12%44%26%11%
203
February1st to 10thDay
6%25%48%17%41
270
11th to 20thDay
323%41%24%7%1
366
21st to endDay
5%23%36%29%7%1
363
March1st to 10thDay
6%23%44%22%5%
420
11th to 20thDay
7%16%41%28%8%
420
21st to endDay
6%22%43%22%7%
462
April1st to 10thDay
10%22%36%23%7%1
420
11th to 20thDay
9%27%34%21%8%1
412
21st to endDay
10%26%29%24%9%2
420
May1st to 10thDay
9%22%30%28%11%1
423
11th to 20thDay
15%17%29%27%11%1
448
21st to endDay
13%17%24%26%16%5%
552
June1st to 10thDay
13%13%25%30%17%3
630
11th to 20thDay
16%18%30%23%12%1
630
21st to endDay
6%10%26%35%21%2
630
July1st to 10thDay
411%34%34%15%2
503
11th to 20thDay
413%39%34%9%
444
21st to endDay
5%12%33%33%15%2
487
August1st to 10thDay
8%7%30%36%16%2
447
11th to 20thDay
5%8%26%38%19%5%
437
21st to endDay
6%14%29%33%15%3
495
September1st to 10thDay
8%12%28%30%19%3
450
11th to 20thDay
10%15%28%29%14%4
450
21st to endDay
9%18%25%30%16%2
450
October1st to 10thDay
9%15%29%25%20%2
424
11th to 20thDay
8%19%27%28%14%5%
270
21st to endDay
8%22%35%25%9%1
297
November1st to 10thDay
11%17%35%27%9%1
270
11th to 20thDay
8%15%39%26%11%1
270
21st to endDay
7%14%37%34%7%
270
December1st to 10thDay
8%11%40%22%15%3
207
11th to 20thDay
7%18%44%24%5%2
180
21st to endDay
8%14%41%24%12%2
198
January1st to 10thNight
6%11%32%39%12%1
760
11th to 20thNight
6%12%31%35%13%3
760
21st to endNight
6%7%32%40%14%2
836
February1st to 10thNight
5%13%41%33%7%1
760
11th to 20thNight
7%12%35%35%10%1
744
21st to endNight
5%12%32%36%13%2
610
March1st to 10thNight
6%10%36%37%10%1
720
11th to 20thNight
5%13%28%37%15%1
720
21st to endNight
7%12%26%42%12%1
792
April1st to 10thNight
7%11%27%35%17%2
720
11th to 20thNight
9%12%34%32%13%1
561
21st to endNight
9%9%27%35%18%2
540
May1st to 10thNight
7%9%23%38%21%2
540
11th to 20thNight
10%8%23%30%27%2
531
21st to endNight
12%7%20%32%24%3
405
June1st to 10thNight
11%415%43%25%2
360
11th to 20thNight
12%8%26%36%18%2
360
21st to endNight
4316%44%31%2
360
July1st to 10thNight
2311%46%35%3
350
11th to 20thNight
2114%58%25%
348
21st to endNight
3110%49%36%2
396
August1st to 10thNight
5%317%43%30%2
537
11th to 20thNight
2214%46%34%2
534
21st to endNight
6%414%45%30%1
612
September1st to 10thNight
7%214%42%32%4
720
11th to 20thNight
7%412%41%30%7%
720
21st to endNight
7%7%18%36%29%4
720
October1st to 10thNight
8%7%20%41%23%2
720
11th to 20thNight
9%9%21%38%20%4
720
21st to endNight
8%11%25%40%12%3
792
November1st to 10thNight
8%11%28%39%14%
740
11th to 20thNight
7%14%33%35%10%1
760
21st to endNight
7%11%31%35%14%2
950
December1st to 10thNight
7%10%33%39%10%2
950
11th to 20thNight
7%11%34%36%10%1
950
21st to endNight
7%15%36%30%11%1
1022
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