Steamboat Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Steamboat Springs clear sky chart from 2005-11-06 to 2024-01-12.

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
49%
24601
20%
74496
16%
24557
53%
24557
28%
46591

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
38%
947
15%
2647
11%
946
40%
946
21%
1901
January11th to 20thNight
34%
801
19%
2439
15%
801
39%
801
21%
1688
January21st to endNight
32%
792
15%
2574
12%
792
38%
792
16%
1861
February1st to 10thNight
26%
720
10%
2340
8%
720
29%
720
14%
1781
February11th to 20thNight
30%
700
13%
2228
8%
700
36%
700
17%
1599
February21st to endNight
29%
592
17%
1776
10%
592
36%
592
18%
1292
March1st to 10thNight
38%
720
19%
2073
11%
720
44%
720
26%
1385
March11th to 20thNight
52%
720
23%
1980
17%
720
56%
720
33%
1249
March21st to endNight
39%
734
15%
2120
11%
734
43%
734
22%
1500
April1st to 10thNight
40%
540
16%
1800
14%
540
46%
540
22%
1163
April11th to 20thNight
40%
533
17%
1777
15%
533
46%
533
22%
1154
April21st to endNight
47%
540
19%
1800
18%
540
52%
540
25%
1108
May1st to 10thNight
47%
540
18%
1622
16%
540
50%
540
25%
1065
May11th to 20thNight
56%
531
18%
1418
14%
531
58%
531
31%
926
May21st to endNight
54%
584
19%
1552
14%
582
59%
582
34%
954
June1st to 10thNight
65%
540
24%
1440
18%
540
68%
540
46%
787
June11th to 20thNight
60%
540
26%
1440
18%
540
65%
540
45%
794
June21st to endNight
73%
540
28%
1440
25%
540
74%
540
55%
729
July1st to 10thNight
79%
525
22%
1400
19%
525
80%
525
49%
763
July11th to 20thNight
80%
522
25%
1392
22%
522
81%
522
51%
742
July21st to endNight
79%
591
21%
1627
21%
558
78%
558
42%
887
August1st to 10thNight
75%
537
21%
1602
20%
534
75%
534
37%
893
August11th to 20thNight
79%
534
30%
1664
29%
534
81%
534
42%
867
August21st to endNight
79%
594
30%
1980
33%
594
81%
594
43%
1012
September1st to 10thNight
75%
540
32%
1800
34%
540
79%
540
44%
869
September11th to 20thNight
73%
540
33%
1800
35%
540
75%
540
42%
910
September21st to endNight
67%
653
32%
2035
26%
653
73%
653
45%
1047
October1st to 10thNight
58%
720
27%
2160
20%
720
63%
720
37%
1232
October11th to 20thNight
56%
720
31%
2160
19%
720
64%
720
40%
1183
October21st to endNight
49%
792
26%
2376
17%
792
55%
792
33%
1406
November1st to 10thNight
45%
889
24%
2369
14%
889
51%
889
37%
1452
November11th to 20thNight
41%
950
22%
2527
13%
950
46%
950
30%
1649
November21st to endNight
45%
950
20%
2660
14%
950
49%
950
30%
1703
December1st to 10thNight
32%
950
14%
2660
8%
950
37%
950
21%
1889
December11th to 20thNight
32%
949
17%
3098
10%
949
36%
949
18%
2048
December21st to endNight
26%
1031
8%
4720
7%
1026
30%
1026
11%
3103

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%10%47%5%3445%7%43%
74736
Night
5%11%5%8%5%2445%6%45%
75013
TransparencyDay
38%6%11%22%17%6%
74448
Night
39%5%11%23%17%5%
74823
SeeingDay
12%14%29%28%15%3
14418
Night
12%7%24%38%18%2
24623

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
5%17%7%13%5%2335%6%35%
1518
11th to 20thDay
316%9%13%7%24345%33%
1578
21st to endDay
316%11%16%7%22345%31%
1782
February1st to 10thDay
5%22%8%15%6%24345%27%
1620
11th to 20thDay
5%16%11%14%7%24246%30%
1618
21st to endDay
317%10%15%8%44445%26%
1480
March1st to 10thDay
5%15%7%12%5%2335%6%36%
1885
11th to 20thDay
214%7%8%5%3445%8%39%
1980
21st to endDay
5%17%8%9%7%35%5%5%7%29%
2236
April1st to 10thDay
6%17%5%9%425%36%6%36%
2160
11th to 20thDay
7%16%5%8%6%45%5%6%7%30%
2131
21st to endDay
5%15%46%6%346%6%8%37%
2160
May1st to 10thDay
10%12%46%5%36%5%7%8%34%
2332
11th to 20thDay
9%9%26%5%46%7%7%9%36%
2478
21st to endDay
8%8%35%5%45%6%6%10%40%
2724
June1st to 10thDay
4423425%6%6%9%53%
2520
11th to 20thDay
5%3234245%5%8%59%
2520
21st to endDay
3313425%5%5%8%61%
2520
July1st to 10thDay
5%323436%6%7%8%54%
2520
11th to 20thDay
2325%445%7%8%8%51%
2520
21st to endDay
5%415%6%47%6%6%9%45%
2591
August1st to 10thDay
6%5%25%6%47%6%7%9%43%
2328
11th to 20thDay
44145%35%5%6%9%53%
2237
21st to endDay
5%4245%35%6%8%8%51%
2376
September1st to 10thDay
5%42442445%6%60%
2160
11th to 20thDay
7%5%2442445%6%56%
2160
21st to endDay
9%5%23422346%61%
1920
October1st to 10thDay
10%10%25%434445%49%
1800
11th to 20thDay
8%9%3432335%7%53%
1800
21st to endDay
7%13%45%43345%5%48%
1980
November1st to 10thDay
6%10%5%8%323446%49%
1690
11th to 20thDay
7%16%5%8%423445%43%
1652
21st to endDay
412%6%12%422246%47%
1520
December1st to 10thDay
418%7%13%7%33335%32%
1520
11th to 20thDay
317%8%10%6%23345%37%
1926
21st to endDay
318%7%13%8%44446%30%
2794
January1st to 10thNight
416%7%14%6%33335%35%
2647
11th to 20thNight
318%8%11%6%23335%37%
2439
21st to endNight
417%10%14%7%2323433%
2574
February1st to 10thNight
420%9%15%7%3334428%
2340
11th to 20thNight
5%17%10%12%6%24436%32%
2227
21st to endNight
417%9%14%7%2345%5%30%
1776
March1st to 10thNight
414%6%10%5%2445%7%39%
2073
11th to 20thNight
5%10%6%6%5%34445%48%
1980
21st to endNight
5%15%8%9%5%34446%36%
2120
April1st to 10thNight
7%15%5%7%5%2445%6%40%
1800
11th to 20thNight
7%14%6%8%43445%7%38%
1777
21st to endNight
8%14%46%42445%7%43%
1800
May1st to 10thNight
9%11%45%5%45%5%7%7%39%
1622
11th to 20thNight
8%8%36%5%345%7%8%42%
1417
21st to endNight
6%7%245%35%5%6%9%48%
1552
June1st to 10thNight
45%233245%6%10%56%
1440
11th to 20thNight
5%424424446%61%
1440
21st to endNight
331332445%6%66%
1440
July1st to 10thNight
3313325%5%7%9%60%
1440
11th to 20thNight
22243345%7%10%59%
1440
21st to endNight
23245%35%6%8%10%52%
1723
August1st to 10thNight
44245%35%6%9%8%51%
1611
11th to 20thNight
3324426%45%9%57%
1664
21st to endNight
4324435%46%8%56%
1980
September1st to 10thNight
441432445%6%63%
1800
11th to 20thNight
5%5%33423447%60%
1800
21st to endNight
8%413323335%64%
2035
October1st to 10thNight
9%7%24324345%55%
2160
11th to 20thNight
7%8%24323346%59%
2160
21st to endNight
8%11%46%413335%52%
2376
November1st to 10thNight
6%11%46%423347%51%
2369
11th to 20thNight
6%15%5%8%323346%45%
2527
21st to endNight
411%6%9%5%33446%45%
2660
December1st to 10thNight
419%7%11%6%3234436%
2660
11th to 20thNight
5%14%7%11%7%33347%36%
3271
21st to endNight
314%6%11%9%4445%7%33%
4873

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
49%5%16%20%8%2
1519
11th to 20thDay
52%6%12%19%9%2
1578
21st to endDay
56%416%14%7%2
1782
February1st to 10thDay
61%411%14%9%1
1620
11th to 20thDay
56%5%9%19%8%2
1627
21st to endDay
57%6%11%14%10%2
1480
March1st to 10thDay
49%412%24%10%1
1885
11th to 20thDay
43%6%14%23%11%2
1980
21st to endDay
53%7%10%21%8%2
2236
April1st to 10thDay
47%5%13%18%13%4
2160
11th to 20thDay
49%6%11%19%13%1
2134
21st to endDay
43%7%10%29%10%
2160
May1st to 10thDay
44%7%11%23%14%1
2332
11th to 20thDay
40%8%14%26%11%1
2482
21st to endDay
37%7%13%26%15%2
2724
June1st to 10thDay
26%7%13%25%22%8%
2520
11th to 20thDay
23%6%9%17%29%15%
2520
21st to endDay
19%7%6%21%31%16%
2520
July1st to 10thDay
24%9%8%20%27%13%
2451
11th to 20thDay
25%7%13%21%20%13%
2445
21st to endDay
31%9%13%20%18%9%
2447
August1st to 10thDay
34%10%12%20%18%7%
2313
11th to 20thDay
26%7%10%22%24%11%
2237
21st to endDay
27%7%9%24%24%10%
2376
September1st to 10thDay
24%5%8%16%28%19%
2160
11th to 20thDay
27%5%9%22%25%11%
2160
21st to endDay
26%45%31%29%5%
1920
October1st to 10thDay
36%6%9%25%18%6%
1800
11th to 20thDay
30%5%7%33%20%4
1800
21st to endDay
37%413%29%14%3
1980
November1st to 10thDay
34%6%12%26%22%1
1690
11th to 20thDay
42%5%15%22%14%2
1652
21st to endDay
40%312%28%15%2
1520
December1st to 10thDay
54%5%17%14%9%2
1520
11th to 20thDay
48%5%13%25%8%
1924
21st to endDay
52%8%6%18%14%2
2794
January1st to 10thNight
51%5%13%21%9%1
2647
11th to 20thNight
51%312%20%12%2
2439
21st to endNight
57%311%18%8%2
2574
February1st to 10thNight
61%410%16%8%1
2340
11th to 20thNight
53%5%9%21%9%2
2228
21st to endNight
54%5%10%17%12%2
1776
March1st to 10thNight
43%6%12%26%13%1
2073
11th to 20thNight
37%5%12%27%16%4
1980
21st to endNight
49%6%12%23%9%1
2120
April1st to 10thNight
43%6%12%19%16%4
1800
11th to 20thNight
44%6%12%22%15%1
1777
21st to endNight
40%5%11%26%17%1
1800
May1st to 10thNight
40%8%11%25%14%1
1622
11th to 20thNight
37%8%16%26%11%2
1418
21st to endNight
31%8%12%28%18%3
1552
June1st to 10thNight
22%6%15%28%21%8%
1440
11th to 20thNight
24%49%19%24%20%
1440
21st to endNight
17%5%6%23%28%21%
1440
July1st to 10thNight
20%7%14%20%22%17%
1400
11th to 20thNight
19%7%15%25%20%15%
1392
21st to endNight
25%6%20%22%18%10%
1627
August1st to 10thNight
27%8%14%26%16%9%
1602
11th to 20thNight
23%6%10%21%25%15%
1664
21st to endNight
24%5%11%22%26%12%
1980
September1st to 10thNight
22%5%10%17%26%20%
1800
11th to 20thNight
25%410%23%23%15%
1800
21st to endNight
23%5%5%27%33%7%
2035
October1st to 10thNight
30%6%9%27%20%9%
2160
11th to 20thNight
28%47%34%22%5%
2160
21st to endNight
35%413%28%17%3
2376
November1st to 10thNight
33%5%12%26%21%3
2369
11th to 20thNight
39%5%13%26%14%3
2527
21st to endNight
40%411%28%15%2
2660
December1st to 10thNight
51%5%13%18%12%2
2660
11th to 20thNight
47%412%25%12%
3272
21st to endNight
49%7%10%16%16%1
4873

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
19%15%25%27%13%2
270
11th to 20thDay
16%13%33%28%9%1
245
21st to endDay
13%17%39%26%4
264
February1st to 10thDay
25%20%33%19%3
240
11th to 20thDay
17%22%31%25%5%
240
21st to endDay
15%26%35%22%3
198
March1st to 10thDay
20%25%26%22%7%1
325
11th to 20thDay
16%21%32%24%6%1
420
21st to endDay
20%29%32%16%3
462
April1st to 10thDay
22%25%29%19%6%
420
11th to 20thDay
25%27%27%17%41
412
21st to endDay
16%23%30%20%7%2
420
May1st to 10thDay
18%20%32%19%10%1
447
11th to 20thDay
15%12%25%28%18%2
625
21st to endDay
12%13%29%27%16%3
679
June1st to 10thDay
6%10%27%31%21%5%
630
11th to 20thDay
8%14%31%30%16%2
630
21st to endDay
48%29%32%23%3
630
July1st to 10thDay
5%5%19%36%32%4
621
11th to 20thDay
45%21%37%27%6%
618
21st to endDay
45%21%38%26%6%
533
August1st to 10thDay
6%5%33%34%18%5%
447
11th to 20thDay
45%29%34%22%5%
437
21st to endDay
5%6%27%36%20%6%
495
September1st to 10thDay
7%10%28%29%18%6%
450
11th to 20thDay
6%9%33%29%19%4
450
21st to endDay
12%11%26%25%18%8%
326
October1st to 10thDay
16%9%22%27%18%9%
270
11th to 20thDay
12%16%26%29%13%3
270
21st to endDay
20%16%31%25%8%2
297
November1st to 10thDay
18%20%27%23%10%3
270
11th to 20thDay
16%14%30%30%9%1
270
21st to endDay
14%11%35%31%9%1
270
December1st to 10thDay
17%15%34%23%9%1
270
11th to 20thDay
17%11%36%27%7%1
270
21st to endDay
20%15%33%25%7%1
297
January1st to 10thNight
17%12%24%36%11%1
950
11th to 20thNight
16%12%30%32%8%1
801
21st to endNight
16%9%32%34%9%1
792
February1st to 10thNight
17%10%35%32%6%
720
11th to 20thNight
14%10%32%37%7%
704
21st to endNight
14%12%35%35%4
592
March1st to 10thNight
13%10%30%36%10%1
720
11th to 20thNight
10%7%22%48%13%
720
21st to endNight
14%9%31%36%10%1
734
April1st to 10thNight
17%11%28%38%6%
540
11th to 20thNight
14%10%30%35%10%1
533
21st to endNight
14%10%22%37%16%1
540
May1st to 10thNight
14%5%28%40%13%1
540
11th to 20thNight
11%319%40%24%2
531
21st to endNight
10%5%22%39%22%3
584
June1st to 10thNight
6%418%42%29%1
540
11th to 20thNight
6%5%22%46%20%1
540
21st to endNight
4214%50%29%1
540
July1st to 10thNight
3111%42%41%3
525
11th to 20thNight
228%46%39%3
522
21st to endNight
216%43%45%3
591
August1st to 10thNight
6%18%40%44%1
537
11th to 20thNight
319%47%38%2
534
21st to endNight
5%8%42%40%5%
594
September1st to 10thNight
5%212%46%32%4
540
11th to 20thNight
6%311%45%32%3
540
21st to endNight
9%317%37%28%6%
653
October1st to 10thNight
12%5%20%39%21%4
720
11th to 20thNight
11%7%22%41%18%2
720
21st to endNight
15%6%25%38%15%2
792
November1st to 10thNight
14%8%29%34%15%1
889
11th to 20thNight
16%10%27%37%9%1
950
21st to endNight
11%9%26%41%12%1
950
December1st to 10thNight
19%10%30%32%8%1
950
11th to 20thNight
15%11%30%36%7%
950
21st to endNight
18%12%32%30%7%1
1045
Page generated at 2024-01-09 14:24:24. Version ac07

Copyright 2024 Attilla Danko


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