Summer Village of Yellowstone
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Summer Village of Yellowstone clear sky chart from 2005-11-06 to 2024-01-10.

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%
23391
11%
74249
7%
23359
44%
23359
18%
51954

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
31%
947
10%
2838
5%
947
35%
947
15%
2149
January11th to 20thNight
32%
900
13%
2700
6%
900
39%
900
16%
1968
January21st to endNight
26%
879
14%
2859
7%
879
35%
879
13%
2110
February1st to 10thNight
37%
720
10%
2520
8%
720
41%
720
13%
1833
February11th to 20thNight
36%
700
11%
2356
8%
700
41%
700
14%
1736
February21st to endNight
43%
592
15%
1846
13%
592
48%
592
18%
1331
March1st to 10thNight
38%
720
14%
2160
12%
720
43%
720
18%
1591
March11th to 20thNight
40%
720
16%
2029
10%
720
45%
720
20%
1461
March21st to endNight
40%
792
10%
2111
5%
792
43%
792
18%
1599
April1st to 10thNight
40%
654
11%
1734
6%
654
43%
654
20%
1294
April11th to 20thNight
37%
533
14%
1601
8%
533
43%
533
17%
1157
April21st to endNight
42%
523
12%
1603
10%
523
46%
523
21%
1092
May1st to 10thNight
39%
360
7%
1324
7%
360
42%
360
14%
943
May11th to 20thNight
48%
354
5%
1239
3%
354
50%
354
21%
800
May21st to endNight
43%
388
0%
1358
0%
388
43%
388
16%
958
June1st to 10thNight
45%
360
0%
1238
0%
360
45%
360
16%
876
June11th to 20thNight
43%
360
0%
1080
0%
360
43%
360
12%
857
June21st to endNight
57%
360
0%
1080
0%
360
57%
360
22%
756
July1st to 10thNight
58%
350
0%
1050
0%
350
58%
350
25%
694
July11th to 20thNight
52%
348
0%
1216
0%
348
52%
348
17%
832
July21st to endNight
58%
394
4%
1302
2%
372
59%
372
24%
803
August1st to 10thNight
58%
358
7%
1382
8%
356
60%
356
17%
899
August11th to 20thNight
57%
423
10%
1491
12%
423
60%
423
24%
913
August21st to endNight
52%
594
15%
1782
12%
594
56%
594
24%
1181
September1st to 10thNight
55%
612
14%
1692
10%
612
57%
612
29%
1120
September11th to 20thNight
53%
720
18%
1962
11%
720
55%
720
31%
1284
September21st to endNight
46%
720
19%
1980
12%
720
52%
720
28%
1304
October1st to 10thNight
45%
720
15%
2069
11%
720
48%
720
23%
1432
October11th to 20thNight
39%
720
17%
2340
11%
720
47%
720
22%
1530
October21st to endNight
35%
792
15%
2574
9%
792
44%
792
18%
1794
November1st to 10thNight
31%
905
12%
2574
8%
905
36%
905
15%
1985
November11th to 20thNight
29%
950
13%
2850
6%
950
37%
950
15%
2139
November21st to endNight
31%
950
9%
2850
5%
950
35%
950
17%
2109
December1st to 10thNight
32%
950
14%
2850
7%
950
38%
950
17%
2052
December11th to 20thNight
35%
949
12%
3482
8%
949
40%
949
14%
2547
December21st to endNight
35%
1074
9%
5127
6%
1066
41%
1066
14%
2825

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
10%9%47%7%46%6%6%8%34%
74966
Night
9%10%48%7%46%5%6%8%32%
74677
TransparencyDay
46%9%17%21%7%1
74641
Night
49%8%14%20%8%1
74521
SeeingDay
13%6%24%31%19%6%
14802
Night
14%5%28%35%16%2
23417

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 10thDay
6%12%5%12%9%5%6%6%6%8%25%
1304
11th to 20thDay
7%12%6%10%8%46%46%7%30%
1260
21st to endDay
7%15%6%10%8%46%7%7%6%24%
1512
February1st to 10thDay
9%11%6%9%9%5%6%6%9%8%21%
1440
11th to 20thDay
5%13%7%9%9%5%6%7%6%8%26%
1491
21st to endDay
411%6%9%10%6%6%7%7%7%25%
1408
March1st to 10thDay
7%15%7%9%9%6%6%5%5%8%25%
1800
11th to 20thDay
8%10%6%7%6%45%6%7%7%33%
1930
21st to endDay
9%14%6%9%8%46%6%7%8%23%
2242
April1st to 10thDay
7%11%49%7%5%7%6%7%8%29%
2225
11th to 20thDay
11%10%48%7%46%6%6%7%30%
2310
21st to endDay
10%11%37%7%45%6%6%8%31%
2354
May1st to 10thDay
11%10%48%8%46%7%7%7%28%
2636
11th to 20thDay
9%6%26%6%46%5%7%8%41%
2654
21st to endDay
18%8%35%6%36%5%6%8%34%
2917
June1st to 10thDay
17%8%37%7%45%6%6%7%31%
2718
11th to 20thDay
19%8%47%8%5%6%6%6%7%25%
2880
21st to endDay
10%6%36%6%46%6%7%9%39%
2880
July1st to 10thDay
12%6%27%5%45%6%7%8%39%
2880
11th to 20thDay
10%5%26%7%46%6%7%11%36%
2700
21st to endDay
10%425%5%36%5%7%9%45%
2938
August1st to 10thDay
9%5%25%6%45%6%8%11%38%
2548
11th to 20thDay
8%5%25%5%35%5%7%11%45%
2408
21st to endDay
11%6%25%7%46%6%6%8%40%
2574
September1st to 10thDay
12%7%36%6%345%6%8%41%
2265
11th to 20thDay
14%7%35%5%25%45%9%42%
1998
21st to endDay
9%6%38%5%35%5%6%9%41%
1980
October1st to 10thDay
11%10%38%7%345%5%6%38%
1890
11th to 20thDay
10%9%5%7%7%345%6%7%36%
1620
21st to endDay
9%12%5%7%7%45%6%6%7%31%
1782
November1st to 10thDay
11%14%6%9%7%45%5%5%8%25%
1484
11th to 20thDay
8%12%49%8%45%45%7%33%
1330
21st to endDay
6%10%6%11%9%5%6%5%5%7%30%
1330
December1st to 10thDay
6%11%5%11%8%6%7%6%47%28%
1330
11th to 20thDay
6%11%6%11%8%5%7%5%5%8%28%
1682
21st to endDay
5%7%47%7%46%6%7%9%39%
2266
January1st to 10thNight
6%12%6%12%10%5%6%6%5%7%26%
2838
11th to 20thNight
7%10%6%10%8%46%5%6%9%28%
2700
21st to endNight
7%13%6%11%8%46%5%6%8%26%
2859
February1st to 10thNight
6%11%6%13%9%6%6%5%6%7%27%
2520
11th to 20thNight
5%11%6%11%10%5%6%6%5%7%26%
2354
21st to endNight
7%11%5%8%9%47%7%6%8%28%
1846
March1st to 10thNight
7%11%5%9%9%5%6%6%7%7%28%
2160
11th to 20thNight
8%9%5%9%8%46%6%7%8%30%
2029
21st to endNight
9%13%6%9%6%46%5%5%9%27%
2111
April1st to 10thNight
9%9%48%9%5%7%6%6%8%28%
1734
11th to 20thNight
9%11%48%8%5%7%5%5%8%29%
1601
21st to endNight
13%9%47%5%35%5%7%8%34%
1603
May1st to 10thNight
11%12%5%9%8%45%6%6%8%27%
1324
11th to 20thNight
9%8%38%7%345%7%7%38%
1239
21st to endNight
19%8%47%6%45%5%5%7%31%
1358
June1st to 10thNight
15%10%47%6%46%6%6%7%30%
1238
11th to 20thNight
16%8%39%7%49%8%8%9%19%
1080
21st to endNight
11%5%37%5%46%8%7%10%34%
1080
July1st to 10thNight
13%7%25%5%35%47%10%38%
1080
11th to 20thNight
11%5%37%7%46%7%9%9%33%
1257
21st to endNight
11%425%6%45%5%7%10%41%
1379
August1st to 10thNight
10%6%36%7%36%7%7%9%37%
1389
11th to 20thNight
10%6%35%5%36%5%7%10%41%
1491
21st to endNight
12%5%36%6%25%7%6%9%39%
1782
September1st to 10thNight
13%6%25%5%35%5%6%8%42%
1692
11th to 20thNight
12%8%25%5%3446%8%44%
1962
21st to endNight
10%8%26%5%35%46%8%43%
1980
October1st to 10thNight
12%8%47%6%45%45%7%38%
2069
11th to 20thNight
10%9%47%6%35%5%6%7%38%
2340
21st to endNight
8%11%48%8%5%5%6%7%7%33%
2574
November1st to 10thNight
14%15%5%9%7%35%6%5%6%25%
2574
11th to 20thNight
8%12%6%11%8%46%5%5%7%28%
2850
21st to endNight
7%10%6%10%9%5%6%5%6%8%28%
2850
December1st to 10thNight
9%12%410%9%445%6%7%30%
2850
11th to 20thNight
8%14%6%10%7%46%5%6%7%28%
3510
21st to endNight
38%38%7%45%5%6%9%42%
5374

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
56%7%12%16%8%1
1304
11th to 20thDay
53%7%15%15%8%2
1260
21st to endDay
56%8%13%16%7%
1512
February1st to 10thDay
55%6%17%13%8%1
1440
11th to 20thDay
54%9%15%16%6%
1499
21st to endDay
55%8%12%17%7%
1408
March1st to 10thDay
57%7%15%16%5%
1800
11th to 20thDay
47%7%13%23%10%1
1931
21st to endDay
56%10%15%15%5%
2242
April1st to 10thDay
49%9%16%17%8%1
2225
11th to 20thDay
50%8%14%21%7%
2310
21st to endDay
49%7%13%22%7%1
2354
May1st to 10thDay
51%8%14%17%9%1
2636
11th to 20thDay
37%8%14%30%11%1
2658
21st to endDay
48%8%14%19%11%
2918
June1st to 10thDay
51%7%16%20%7%
2718
11th to 20thDay
55%10%14%15%5%
2880
21st to endDay
39%11%20%24%5%1
2880
July1st to 10thDay
41%10%18%25%5%1
2801
11th to 20thDay
41%13%25%20%2
2619
21st to endDay
33%10%28%26%3
2775
August1st to 10thDay
37%12%27%21%3
2530
11th to 20thDay
33%10%26%26%6%
2408
21st to endDay
40%10%21%23%6%
2574
September1st to 10thDay
40%8%19%24%7%1
2265
11th to 20thDay
39%8%20%26%7%
1998
21st to endDay
39%9%16%25%9%2
1980
October1st to 10thDay
46%7%17%22%8%1
1890
11th to 20thDay
45%9%14%24%8%
1620
21st to endDay
50%8%12%23%7%
1782
November1st to 10thDay
58%7%13%15%6%1
1484
11th to 20thDay
50%7%16%19%8%
1330
21st to endDay
52%8%15%17%6%1
1330
December1st to 10thDay
55%7%12%15%9%1
1330
11th to 20thDay
53%7%14%18%7%
1684
21st to endDay
38%6%14%24%16%2
2266
January1st to 10thNight
57%7%13%15%7%2
2838
11th to 20thNight
51%8%15%17%7%2
2700
21st to endNight
55%7%13%14%10%1
2859
February1st to 10thNight
56%7%13%16%8%1
2520
11th to 20thNight
54%9%14%15%9%
2356
21st to endNight
52%7%12%19%9%1
1846
March1st to 10thNight
52%8%14%20%6%1
2160
11th to 20thNight
51%6%11%19%12%1
2029
21st to endNight
54%8%13%18%6%1
2111
April1st to 10thNight
51%7%14%17%9%1
1734
11th to 20thNight
54%6%11%19%10%2
1601
21st to endNight
46%7%11%23%12%1
1603
May1st to 10thNight
53%8%10%19%10%1
1324
11th to 20thNight
43%8%11%23%13%1
1239
21st to endNight
52%7%12%17%11%1
1358
June1st to 10thNight
52%7%14%19%8%
1238
11th to 20thNight
56%13%13%14%3
1080
21st to endNight
42%13%19%21%5%
1080
July1st to 10thNight
39%10%22%22%6%1
1050
11th to 20thNight
43%13%22%18%3
1216
21st to endNight
36%11%23%27%4
1302
August1st to 10thNight
42%12%21%24%2
1382
11th to 20thNight
37%9%22%25%6%1
1491
21st to endNight
39%10%16%25%8%
1782
September1st to 10thNight
37%9%17%27%8%2
1692
11th to 20thNight
38%6%16%29%10%1
1962
21st to endNight
38%9%14%26%13%2
1980
October1st to 10thNight
46%7%13%23%11%
2069
11th to 20thNight
42%7%15%25%9%
2340
21st to endNight
48%8%15%21%8%1
2574
November1st to 10thNight
59%6%11%18%6%
2574
11th to 20thNight
56%7%12%17%7%1
2850
21st to endNight
53%8%15%17%5%1
2850
December1st to 10thNight
53%5%12%18%10%1
2850
11th to 20thNight
55%7%15%17%6%
3507
21st to endNight
38%6%15%23%14%2
5374

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
11%430%29%19%7%
178
11th to 20thDay
12%8%29%29%18%5%
160
21st to endDay
12%12%24%31%16%5%
176
February1st to 10thDay
16%9%31%31%11%2
160
11th to 20thDay
17%5%30%33%11%2
202
21st to endDay
6%8%30%30%19%6%
274
March1st to 10thDay
13%8%30%31%16%3
420
11th to 20thDay
10%6%28%34%16%6%
420
21st to endDay
14%6%31%24%21%3
462
April1st to 10thDay
9%12%32%33%11%4
420
11th to 20thDay
15%6%22%33%17%7%
412
21st to endDay
14%10%28%29%15%5%
420
May1st to 10thDay
14%9%26%29%18%3
539
11th to 20thDay
11%5%23%36%20%5%
625
21st to endDay
18%421%29%20%7%
679
June1st to 10thDay
18%8%24%31%14%4
648
11th to 20thDay
20%5%21%27%20%7%
810
21st to endDay
12%418%30%26%9%
810
July1st to 10thDay
13%220%34%23%8%
796
11th to 20thDay
12%320%33%25%6%
618
21st to endDay
11%414%33%26%11%
684
August1st to 10thDay
11%6%16%31%22%16%
488
11th to 20thDay
9%426%32%22%7%
437
21st to endDay
16%5%17%32%23%8%
495
September1st to 10thDay
16%9%27%24%20%5%
450
11th to 20thDay
17%5%24%29%19%6%
450
21st to endDay
12%11%29%30%14%5%
450
October1st to 10thDay
15%8%24%30%18%5%
368
11th to 20thDay
15%10%30%26%15%4
270
21st to endDay
14%10%37%26%10%2
297
November1st to 10thDay
19%6%32%29%12%3
266
11th to 20thDay
12%7%37%29%12%3
180
21st to endDay
8%7%36%33%12%5%
180
December1st to 10thDay
9%8%30%33%13%7%
180
11th to 20thDay
8%11%32%34%13%2
180
21st to endDay
7%424%35%27%5%
198
January1st to 10thNight
12%5%35%32%13%2
951
11th to 20thNight
11%8%33%33%13%2
900
21st to endNight
13%10%35%29%11%2
879
February1st to 10thNight
11%7%28%34%18%3
720
11th to 20thNight
11%5%34%33%15%2
704
21st to endNight
11%428%35%18%4
592
March1st to 10thNight
11%5%31%34%17%2
720
11th to 20thNight
12%430%37%15%3
720
21st to endNight
14%5%25%38%16%3
792
April1st to 10thNight
11%7%27%37%16%2
654
11th to 20thNight
14%6%28%33%17%1
533
21st to endNight
15%6%27%36%15%1
523
May1st to 10thNight
14%6%26%37%15%2
360
11th to 20thNight
13%227%35%21%2
354
21st to endNight
20%5%22%33%18%1
389
June1st to 10thNight
20%5%21%38%14%2
360
11th to 20thNight
20%419%34%20%3
360
21st to endNight
14%318%36%25%4
360
July1st to 10thNight
16%314%42%24%1
350
11th to 20thNight
13%5%20%38%23%2
348
21st to endNight
11%317%41%25%3
394
August1st to 10thNight
11%418%31%31%5%
358
11th to 20thNight
13%418%38%25%4
423
21st to endNight
13%323%38%23%1
594
September1st to 10thNight
16%318%39%22%2
612
11th to 20thNight
16%419%38%21%2
720
21st to endNight
14%5%28%35%16%2
720
October1st to 10thNight
17%426%36%17%1
720
11th to 20thNight
15%431%36%13%1
720
21st to endNight
12%9%33%33%12%1
792
November1st to 10thNight
21%5%30%31%10%2
905
11th to 20thNight
13%8%37%30%10%3
950
21st to endNight
12%6%37%34%10%1
950
December1st to 10thNight
14%6%33%30%14%3
950
11th to 20thNight
13%7%32%34%14%1
950
21st to endNight
11%430%37%15%3
1090
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