Scofield State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Scofield State Park clear sky chart from 2005-11-06 to 2024-03-06.

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
46%
24490
25%
80043
17%
24401
57%
24401
33%
42139

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
40%
748
18%
4010
16%
736
48%
736
19%
2036
January11th to 20thNight
39%
758
20%
4045
19%
740
51%
740
19%
2043
January21st to endNight
38%
827
18%
4315
17%
814
52%
814
18%
2260
February1st to 10thNight
31%
760
21%
2470
11%
760
46%
760
27%
1345
February11th to 20thNight
33%
740
24%
2358
13%
740
48%
740
27%
1279
February21st to endNight
29%
628
27%
1884
13%
628
45%
628
31%
1003
March1st to 10thNight
38%
742
25%
2054
14%
742
50%
742
34%
1164
March11th to 20thNight
46%
720
25%
1980
16%
720
54%
720
37%
1114
March21st to endNight
32%
792
21%
2178
8%
792
44%
792
30%
1274
April1st to 10thNight
35%
680
23%
1940
9%
680
46%
680
32%
1083
April11th to 20thNight
32%
533
26%
1704
12%
533
46%
533
29%
919
April21st to endNight
36%
540
31%
1620
14%
540
53%
540
36%
829
May1st to 10thNight
39%
540
25%
1620
14%
540
49%
540
30%
932
May11th to 20thNight
50%
531
24%
1595
18%
531
57%
531
36%
874
May21st to endNight
46%
583
20%
1746
13%
582
55%
582
33%
970
June1st to 10thNight
50%
540
27%
1547
16%
540
62%
540
43%
798
June11th to 20thNight
47%
540
30%
1440
17%
540
59%
540
45%
747
June21st to endNight
58%
540
29%
1609
23%
540
66%
540
51%
753
July1st to 10thNight
62%
525
22%
1575
18%
525
68%
525
41%
842
July11th to 20thNight
63%
522
21%
1566
19%
522
67%
522
37%
871
July21st to endNight
70%
591
22%
1674
19%
558
72%
558
36%
951
August1st to 10thNight
62%
537
24%
1602
17%
534
67%
534
37%
878
August11th to 20thNight
65%
534
29%
1602
20%
534
70%
534
43%
822
August21st to endNight
66%
594
34%
1844
28%
594
71%
594
43%
938
September1st to 10thNight
68%
625
35%
1885
27%
625
76%
625
54%
888
September11th to 20thNight
69%
720
35%
1980
25%
720
77%
720
55%
981
September21st to endNight
61%
720
38%
1980
23%
720
71%
720
51%
998
October1st to 10thNight
53%
720
29%
2092
19%
720
62%
720
41%
1118
October11th to 20thNight
53%
720
35%
2160
20%
720
67%
720
45%
1040
October21st to endNight
49%
792
35%
2376
20%
792
64%
792
43%
1161
November1st to 10thNight
49%
740
32%
2341
21%
740
62%
740
41%
1156
November11th to 20thNight
45%
760
31%
2470
22%
760
57%
760
41%
1142
November21st to endNight
46%
886
27%
2596
17%
886
56%
886
37%
1373
December1st to 10thNight
38%
950
22%
2660
11%
950
47%
950
35%
1496
December11th to 20thNight
37%
948
22%
3117
12%
948
44%
948
25%
1792
December21st to endNight
31%
864
12%
4408
10%
855
40%
855
16%
2269

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
46%37%6%45%5%6%7%48%
78618
Night
25%36%6%345%6%8%51%
80937
TransparencyDay
33%410%23%21%10%
78343
Night
28%312%26%21%9%
80733
SeeingDay
11%20%32%24%10%3
13980
Night
7%15%25%31%18%4
24530

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
145%12%8%6%5%6%6%9%37%
2858
11th to 20thDay
16%5%10%10%6%6%6%7%7%35%
2860
21st to endDay
211%7%11%5%23346%46%
3146
February1st to 10thDay
18%5%10%7%445%6%6%44%
1710
11th to 20thDay
310%5%8%5%245%7%8%42%
1707
21st to endDay
29%5%9%8%45%5%5%7%41%
1570
March1st to 10thDay
39%5%9%7%35%5%7%8%39%
2022
11th to 20thDay
210%5%7%6%35%6%6%7%43%
1980
21st to endDay
412%5%8%7%46%5%6%6%37%
2178
April1st to 10thDay
39%37%6%47%5%6%8%42%
2020
11th to 20thDay
48%38%8%46%6%5%7%41%
2202
21st to endDay
6%8%46%6%35%46%7%45%
2340
May1st to 10thDay
6%7%36%6%36%6%6%7%43%
2340
11th to 20thDay
6%9%26%7%46%5%6%7%42%
2301
21st to endDay
7%9%35%7%5%6%6%6%8%39%
2530
June1st to 10thDay
4425%435%5%5%8%55%
2402
11th to 20thDay
5%424434447%60%
2518
21st to endDay
341343445%7%63%
2340
July1st to 10thDay
6%425%5%37%6%6%7%49%
2340
11th to 20thDay
6%435%7%46%6%6%8%46%
2340
21st to endDay
6%426%7%46%7%7%8%42%
2545
August1st to 10thDay
6%5%26%5%36%6%7%8%47%
2328
11th to 20thDay
4415%5%45%5%6%7%54%
2299
21st to endDay
5%426%6%46%6%6%7%49%
2512
September1st to 10thDay
5%4245%34446%59%
2071
11th to 20thDay
5%4245%3445%6%59%
1980
21st to endDay
5%42432235%5%64%
1980
October1st to 10thDay
8%7%25%5%3444454%
1868
11th to 20thDay
5%434423347%61%
1800
21st to endDay
25%35%433446%60%
1980
November1st to 10thDay
37%35%43446%8%54%
1738
11th to 20thDay
24344245%6%8%57%
1710
21st to endDay
25%47%6%245%6%7%52%
1561
December1st to 10thDay
25%37%6%4447%8%49%
1520
11th to 20thDay
27%47%8%36%7%7%10%40%
1926
21st to endDay
26%410%7%45%5%7%8%42%
3096
January1st to 10thNight
14314%14%5%445%7%40%
4097
11th to 20thNight
14412%12%7%6%5%6%7%36%
4110
21st to endNight
110%6%11%7%2445%8%42%
4521
February1st to 10thNight
16%36%6%46%5%6%9%48%
2470
11th to 20thNight
15%47%6%35%6%7%9%47%
2357
21st to endNight
2446%5%45%7%7%8%48%
1884
March1st to 10thNight
15%46%6%35%5%8%10%46%
2054
11th to 20thNight
17%46%5%35%46%9%51%
1980
21st to endNight
27%46%6%346%8%8%45%
2178
April1st to 10thNight
26%25%5%45%5%6%8%51%
1940
11th to 20thNight
45%26%5%35%5%6%9%50%
1704
21st to endNight
35%25%5%345%7%9%53%
1620
May1st to 10thNight
46%36%6%446%8%8%46%
1620
11th to 20thNight
35%25%6%36%6%6%8%52%
1594
21st to endNight
5%5%25%5%35%46%9%51%
1746
June1st to 10thNight
44234336%6%9%56%
1547
11th to 20thNight
3313334445%66%
1440
21st to endNight
21133345%5%6%67%
1609
July1st to 10thNight
4325%5%35%45%7%57%
1620
11th to 20thNight
5%435%5%35%6%7%8%48%
1620
21st to endNight
5%326%5%46%8%7%10%45%
1773
August1st to 10thNight
5%5%25%446%6%6%9%50%
1611
11th to 20thNight
4425%43446%9%55%
1602
21st to endNight
3325%5%3445%7%59%
1844
September1st to 10thNight
331322345%7%67%
1885
11th to 20thNight
3212423447%66%
1980
21st to endNight
5%324223345%69%
1980
October1st to 10thNight
5%5%24424446%60%
2092
11th to 20thNight
232432345%6%65%
2160
21st to endNight
33245%3345%6%62%
2376
November1st to 10thNight
25%25%42446%7%59%
2341
11th to 20thNight
14144245%7%9%59%
2470
21st to endNight
25%26%5%3446%8%54%
2596
December1st to 10thNight
26%37%6%345%7%8%50%
2660
11th to 20thNight
27%36%8%45%6%8%8%42%
3271
21st to endNight
26%38%10%46%6%7%8%39%
4585

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
36%6%12%31%14%1
2859
11th to 20thDay
34%5%20%26%13%2
2860
21st to endDay
36%318%26%14%3
3146
February1st to 10thDay
37%6%19%21%14%4
1710
11th to 20thDay
34%415%26%18%2
1716
21st to endDay
40%311%28%16%2
1570
March1st to 10thDay
39%313%29%13%2
2022
11th to 20thDay
39%315%26%12%4
1980
21st to endDay
44%413%26%10%3
2178
April1st to 10thDay
38%412%24%18%5%
2020
11th to 20thDay
40%310%24%20%2
2205
21st to endDay
36%38%31%20%1
2340
May1st to 10thDay
36%5%7%25%22%4
2340
11th to 20thDay
39%47%26%20%4
2304
21st to endDay
42%49%22%21%3
2530
June1st to 10thDay
27%36%21%33%10%
2402
11th to 20thDay
26%35%15%30%21%
2518
21st to endDay
22%3213%27%32%
2340
July1st to 10thDay
31%7%413%19%26%
2276
11th to 20thDay
34%5%7%16%17%22%
2271
21st to endDay
36%5%10%15%18%16%
2404
August1st to 10thDay
33%5%9%16%17%20%
2313
11th to 20thDay
28%5%6%12%27%21%
2299
21st to endDay
32%5%6%18%25%15%
2512
September1st to 10thDay
26%46%13%26%25%
2071
11th to 20thDay
28%37%17%25%20%
1980
21st to endDay
23%3420%37%14%
1980
October1st to 10thDay
34%26%21%27%10%
1868
11th to 20thDay
23%35%29%32%8%
1800
21st to endDay
24%311%31%26%4
1980
November1st to 10thDay
27%5%12%28%23%6%
1738
11th to 20thDay
22%418%31%23%3
1710
21st to endDay
29%312%29%21%5%
1561
December1st to 10thDay
29%6%22%26%12%5%
1520
11th to 20thDay
35%417%28%15%2
1924
21st to endDay
37%313%16%20%11%
3096
January1st to 10thNight
35%314%27%19%2
4097
11th to 20thNight
34%320%27%12%4
4110
21st to endNight
36%217%27%15%3
4521
February1st to 10thNight
28%6%20%28%15%3
2470
11th to 20thNight
28%5%12%28%23%3
2358
21st to endNight
27%414%30%20%5%
1884
March1st to 10thNight
29%316%34%17%2
2054
11th to 20thNight
30%213%34%17%4
1980
21st to endNight
30%418%30%14%3
2178
April1st to 10thNight
27%5%15%25%21%7%
1940
11th to 20thNight
29%410%30%24%3
1704
21st to endNight
25%213%35%23%2
1620
May1st to 10thNight
32%410%30%20%5%
1620
11th to 20thNight
29%411%28%23%6%
1595
21st to endNight
30%313%29%21%4
1746
June1st to 10thNight
23%37%28%29%10%
1547
11th to 20thNight
20%36%17%29%25%
1440
21st to endNight
18%3211%27%38%
1609
July1st to 10thNight
26%5%6%14%21%28%
1575
11th to 20thNight
30%410%17%18%22%
1566
21st to endNight
30%5%12%19%16%17%
1674
August1st to 10thNight
29%413%19%17%18%
1602
11th to 20thNight
26%29%17%22%22%
1602
21st to endNight
24%47%19%27%19%
1844
September1st to 10thNight
18%37%17%28%27%
1885
11th to 20thNight
19%29%23%24%24%
1980
21st to endNight
20%2318%38%18%
1980
October1st to 10thNight
25%37%26%27%12%
2092
11th to 20thNight
19%36%25%36%10%
2160
21st to endNight
20%312%33%26%6%
2376
November1st to 10thNight
22%411%31%24%7%
2341
11th to 20thNight
19%316%34%24%4
2470
21st to endNight
26%412%28%24%8%
2596
December1st to 10thNight
28%419%28%15%5%
2660
11th to 20thNight
33%5%15%29%15%3
3272
21st to endNight
36%314%21%17%9%
4585

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
17%21%30%24%7%1
270
11th to 20thDay
17%24%25%26%6%2
270
21st to endDay
10%29%31%19%10%
297
February1st to 10thDay
15%36%30%12%6%
270
11th to 20thDay
15%33%30%15%6%1
312
21st to endDay
15%33%37%13%21
382
March1st to 10thDay
14%29%36%16%5%
441
11th to 20thDay
13%24%35%21%5%1
420
21st to endDay
17%29%38%12%3
462
April1st to 10thDay
16%28%31%14%9%1
420
11th to 20thDay
18%31%36%9%5%1
412
21st to endDay
19%30%26%16%7%1
420
May1st to 10thDay
17%28%34%14%5%1
423
11th to 20thDay
16%19%35%19%9%2
448
21st to endDay
14%20%29%23%12%2
485
June1st to 10thDay
7%18%36%27%10%2
512
11th to 20thDay
10%18%35%22%12%3
628
21st to endDay
6%18%38%30%8%1
450
July1st to 10thDay
7%9%30%37%12%4
446
11th to 20thDay
6%8%34%36%14%2
444
21st to endDay
5%324%40%21%6%
487
August1st to 10thDay
8%6%35%33%15%3
447
11th to 20thDay
5%7%33%35%15%5%
437
21st to endDay
6%8%33%31%18%5%
495
September1st to 10thDay
7%14%27%28%16%8%
450
11th to 20thDay
8%15%32%26%15%4
450
21st to endDay
9%16%27%29%14%5%
450
October1st to 10thDay
15%18%26%22%13%6%
338
11th to 20thDay
10%19%28%25%16%3
270
21st to endDay
10%25%30%24%10%1
297
November1st to 10thDay
14%27%23%21%14%1
270
11th to 20thDay
10%18%38%21%9%4
270
21st to endDay
9%19%31%26%13%2
270
December1st to 10thDay
11%17%35%25%9%3
270
11th to 20thDay
7%27%30%28%8%
270
21st to endDay
14%24%34%20%7%1
297
January1st to 10thNight
7%17%28%27%16%4
760
11th to 20thNight
8%18%28%31%13%3
760
21st to endNight
8%21%25%30%14%3
836
February1st to 10thNight
9%24%31%24%9%4
760
11th to 20thNight
5%26%28%29%9%2
744
21st to endNight
9%22%33%27%7%1
628
March1st to 10thNight
5%20%30%32%11%2
742
11th to 20thNight
6%15%26%34%18%2
720
21st to endNight
7%23%30%27%9%2
792
April1st to 10thNight
11%18%31%27%11%1
680
11th to 20thNight
10%20%33%26%9%2
533
21st to endNight
7%23%30%24%14%2
540
May1st to 10thNight
9%18%28%30%13%3
540
11th to 20thNight
8%10%25%33%21%3
531
21st to endNight
9%14%23%30%21%3
584
June1st to 10thNight
7%11%26%31%22%3
540
11th to 20thNight
6%17%26%35%15%2
540
21st to endNight
37%26%38%23%3
540
July1st to 10thNight
5%5%18%29%37%6%
525
11th to 20thNight
4416%39%32%5%
522
21st to endNight
7%38%37%39%6%
591
August1st to 10thNight
6%414%40%32%4
537
11th to 20thNight
5%415%38%33%5%
534
21st to endNight
5%416%37%34%5%
594
September1st to 10thNight
5%418%34%33%7%
625
11th to 20thNight
5%418%38%27%9%
720
21st to endNight
7%9%18%29%27%10%
720
October1st to 10thNight
7%12%23%33%22%3
720
11th to 20thNight
5%16%22%30%24%4
720
21st to endNight
7%17%23%31%17%5%
792
November1st to 10thNight
7%14%24%33%18%4
740
11th to 20thNight
7%19%25%30%14%4
760
21st to endNight
8%18%22%31%16%4
886
December1st to 10thNight
9%18%31%30%12%2
950
11th to 20thNight
8%19%28%32%12%1
950
21st to endNight
11%19%29%31%8%1
874
Page generated at 2024-03-03 04:28:54. Version ac07

Copyright © 2024 Attilla Danko.


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