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 2005-11-05 to 2017-10-16.

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%
15897
25%
47410
17%
15859
57%
15859
35%
26153

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
42%
717
22%
2327
17%
716
49%
716
30%
1312
January16th to endNight
43%
768
25%
2496
19%
768
52%
768
30%
1401
February1st to 15thNight
40%
700
18%
2288
14%
700
48%
700
27%
1318
February16th to endNight
34%
632
26%
1925
15%
632
47%
632
30%
1053
March1st to 15thNight
47%
720
25%
1989
17%
720
55%
720
41%
1074
March16th to endNight
39%
768
21%
2112
11%
768
46%
768
32%
1233
April1st to 15thNight
35%
632
20%
1891
10%
632
44%
632
29%
1100
April16th to endNight
38%
540
27%
1629
15%
540
49%
540
33%
865
May1st to 15thNight
45%
540
23%
1620
15%
540
51%
540
31%
940
May16th to endNight
51%
562
21%
1685
16%
561
57%
561
35%
936
June1st to 15thNight
50%
540
24%
1509
16%
540
59%
540
42%
799
June16th to endNight
57%
540
30%
1553
24%
540
66%
540
54%
731
July1st to 15thNight
65%
510
18%
1530
17%
510
68%
510
36%
868
July16th to endNight
66%
564
20%
1593
18%
531
67%
531
33%
945
August1st to 15thNight
64%
539
22%
1611
17%
536
68%
536
35%
915
August16th to endNight
69%
573
33%
1761
27%
573
73%
573
41%
915
September1st to 15thNight
71%
657
31%
1917
23%
657
79%
657
52%
945
September16th to endNight
67%
716
38%
1980
27%
716
74%
716
51%
1001
October1st to 15thNight
53%
720
29%
2115
18%
720
63%
720
44%
1089
October16th to endNight
53%
708
32%
2124
21%
708
64%
708
40%
1098
November1st to 15thNight
52%
700
29%
2236
23%
700
61%
700
37%
1154
November16th to endNight
49%
799
26%
2419
19%
799
56%
799
37%
1252
December1st to 15thNight
36%
900
17%
2520
10%
900
43%
900
29%
1522
December16th to endNight
36%
852
17%
2580
11%
852
42%
852
22%
1687

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%36%5%35%5%5%7%47%
47995
Night
35%25%5%345%6%8%51%
47604
TransparencyDay
34%411%22%18%8%
47690
Night
28%413%26%18%8%
47410
SeeingDay
11%19%31%24%10%2
5541
Night
6%13%22%30%21%4
15905

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 15thDay
17%47%4346%6%9%43%
1611
16th to endDay
28%46%5%345%5%6%46%
1728
February1st to 15thDay
18%5%8%5%3447%8%42%
1575
16th to endDay
411%5%7%5%335%5%6%40%
1548
March1st to 15thDay
27%48%6%35%46%7%43%
1971
16th to endDay
310%46%7%35%5%5%6%39%
2112
April1st to 15thDay
38%37%6%47%5%5%6%41%
2057
16th to endDay
6%8%37%7%35%45%6%41%
2330
May1st to 15thDay
7%7%36%6%35%5%5%7%42%
2331
16th to endDay
6%8%36%7%45%5%5%6%40%
2429
June1st to 15thDay
5%425%425%447%53%
2442
16th to endDay
3313322335%66%
2398
July1st to 15thDay
6%425%5%37%5%6%6%44%
2340
16th to endDay
6%426%7%36%6%5%8%40%
2467
August1st to 15thDay
6%5%15%5%36%5%7%7%44%
2340
16th to endDay
4425%6%45%6%5%6%49%
2441
September1st to 15thDay
6%4245%345%45%53%
2040
16th to endDay
5%42432235%5%60%
1980
October1st to 15thDay
7%5%2443334455%
1844
16th to endDay
45%245%23446%54%
1768
November1st to 15thDay
35%35%42445%6%53%
1623
16th to endDay
2436%42446%8%52%
1527
December1st to 15thDay
25%37%7%45%48%7%42%
1440
16th to endDay
39%48%9%35%5%5%9%34%
1653
January1st to 15thNight
15%37%6%3447%9%46%
2327
16th to endNight
27%446%345%6%9%45%
2496
February1st to 15thNight
15%35%5%36%46%9%47%
2277
16th to endNight
2445%4347%9%8%44%
1925
March1st to 15thNight
1435%42447%11%50%
1989
16th to endNight
27%45%5%245%7%8%46%
2112
April1st to 15thNight
37%345%35%46%8%47%
1891
16th to endNight
3425%5%245%6%9%50%
1629
May1st to 15thNight
4425%5%345%7%7%47%
1619
16th to endNight
45%14435%45%9%50%
1684
June1st to 15thNight
44233235%5%7%59%
1509
16th to endNight
113324345%69%
1553
July1st to 15thNight
4325%6%35%5%5%7%50%
1620
16th to endNight
6%326%436%6%6%9%43%
1701
August1st to 15thNight
5%5%25%5%35%6%5%9%47%
1620
16th to endNight
33245%2446%8%54%
1761
September1st to 15thNight
421222245%7%63%
1917
16th to endNight
4323212345%66%
1980
October1st to 15thNight
331342435%6%60%
2115
16th to endNight
342442346%7%57%
2124
November1st to 15thNight
242442446%6%55%
2236
16th to endNight
1415%5%2446%7%54%
2419
December1st to 15thNight
26%27%5%345%7%8%45%
2520
16th to endNight
38%39%7%46%6%6%8%34%
2580

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
32%6%24%26%9%
1612
16th to endDay
34%6%17%24%12%5%
1728
February1st to 15thDay
35%7%21%21%11%2
1575
16th to endDay
40%314%28%13%
1548
March1st to 15thDay
35%317%28%11%3
1971
16th to endDay
40%415%27%7%4
2112
April1st to 15thDay
40%311%25%15%2
2057
16th to endDay
42%39%26%16%2
2330
May1st to 15thDay
38%47%24%20%4
2331
16th to endDay
42%39%22%19%2
2432
June1st to 15thDay
30%35%17%31%11%
2442
16th to endDay
21%2210%29%34%
2398
July1st to 15thDay
37%5%5%13%13%24%
2201
16th to endDay
37%5%7%14%16%18%
2312
August1st to 15thDay
34%6%8%16%14%18%
2325
16th to endDay
32%46%17%26%12%
2441
September1st to 15thDay
31%37%14%25%17%
2040
16th to endDay
25%36%21%32%11%
1980
October1st to 15thDay
30%27%25%27%5%
1844
16th to endDay
29%39%30%25%1
1768
November1st to 15thDay
28%5%13%26%20%5%
1623
16th to endDay
27%219%31%16%2
1527
December1st to 15thDay
34%7%24%26%6%
1440
16th to endDay
44%6%17%21%8%1
1653
January1st to 15thNight
30%5%22%28%10%2
2327
16th to endNight
31%419%25%13%6%
2496
February1st to 15thNight
30%8%17%26%13%2
2288
16th to endNight
28%415%33%16%1
1925
March1st to 15thNight
25%219%34%15%2
1989
16th to endNight
30%318%31%12%3
2112
April1st to 15thNight
32%414%25%19%3
1891
16th to endNight
27%314%33%19%1
1629
May1st to 15thNight
32%311%27%18%5%
1620
16th to endNight
29%313%30%20%2
1685
June1st to 15thNight
23%38%20%31%12%
1509
16th to endNight
16%2310%28%39%
1553
July1st to 15thNight
30%48%16%13%26%
1530
16th to endNight
33%5%9%16%15%19%
1593
August1st to 15thNight
32%311%19%15%18%
1611
16th to endNight
25%37%22%26%14%
1761
September1st to 15thNight
19%210%18%27%20%
1917
16th to endNight
20%25%24%31%15%
1980
October1st to 15thNight
23%29%27%27%9%
2115
16th to endNight
23%410%29%29%3
2124
November1st to 15thNight
24%414%29%20%6%
2236
16th to endNight
24%317%32%18%3
2419
December1st to 15thNight
32%6%20%29%11%
2520
16th to endNight
42%6%18%23%8%1
2580

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
20%18%27%31%2
90
16th to endDay
12%13%33%26%13%1
96
February1st to 15thDay
10%27%24%17%18%1
90
16th to endDay
13%35%32%12%4
207
March1st to 15thDay
12%27%36%18%5%
270
16th to endDay
15%32%37%12%1
288
April1st to 15thDay
14%31%32%11%6%2
269
16th to endDay
20%34%29%12%3
270
May1st to 15thDay
16%28%35%14%41
288
16th to endDay
15%21%28%22%10%2
330
June1st to 15thDay
9%18%31%24%12%3
417
16th to endDay
6%14%36%27%13%1
373
July1st to 15thDay
11%10%29%33%10%4
305
16th to endDay
5%6%29%40%14%2
327
August1st to 15thDay
8%6%38%32%10%2
315
16th to endDay
7%8%30%29%18%5%
332
September1st to 15thDay
8%14%34%24%12%5%
315
16th to endDay
11%15%26%29%14%2
315
October1st to 15thDay
10%25%24%24%13%2
179
16th to endDay
18%17%25%25%13%1
99
November1st to 15thDay
220%21%25%24%6%
90
16th to endDay
10%30%30%22%5%2
90
December1st to 15thDay
322%45%23%5%
90
16th to endDay
10%20%27%34%6%1
96
January1st to 15thNight
416%29%25%18%5%
720
16th to endNight
8%18%23%26%17%5%
768
February1st to 15thNight
7%17%28%28%14%4
704
16th to endNight
5%21%31%30%9%1
632
March1st to 15thNight
416%25%33%16%2
720
16th to endNight
5%22%26%27%14%2
768
April1st to 15thNight
11%17%30%25%13%2
632
16th to endNight
5%22%28%26%14%2
540
May1st to 15thNight
7%15%25%30%17%3
540
16th to endNight
7%12%22%28%25%3
563
June1st to 15thNight
7%10%25%31%22%2
540
16th to endNight
28%25%35%24%3
540
July1st to 15thNight
5%411%28%41%7%
510
16th to endNight
7%39%33%39%7%
564
August1st to 15thNight
7%211%38%35%3
539
16th to endNight
4211%32%39%8%
573
September1st to 15thNight
5%214%33%33%11%
657
16th to endNight
6%6%14%28%31%11%
716
October1st to 15thNight
411%25%31%21%5%
720
16th to endNight
5%14%21%29%22%6%
708
November1st to 15thNight
5%14%21%29%22%6%
700
16th to endNight
6%18%19%31%18%6%
799
December1st to 15thNight
7%19%30%28%11%2
900
16th to endNight
10%15%28%33%10%1
852
Page generated at 2017-10-17 14:35:19. Version ac04

Copyright 2017 A. Danko


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