Dinosaur Valley State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dinosaur Valley State Park clear sky chart from 2005-11-05 to

2017-09-12
.

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
52%
15535
31%
46868
21%
15489
62%
15489
42%
24840

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
41%
897
31%
2327
15%
895
50%
895
41%
1335
January16th to endNight
41%
954
35%
2490
14%
954
53%
954
42%
1426
February1st to 15thNight
34%
704
30%
2105
13%
697
49%
697
37%
1158
February16th to endNight
29%
632
32%
1894
11%
632
46%
632
39%
1016
March1st to 15thNight
33%
558
29%
1998
15%
558
48%
558
29%
1091
March16th to endNight
35%
576
27%
2112
15%
576
52%
576
32%
1089
April1st to 15thNight
32%
539
27%
1977
13%
539
52%
539
34%
967
April16th to endNight
34%
540
29%
1702
17%
540
52%
540
38%
929
May1st to 15thNight
37%
540
24%
1620
15%
540
51%
540
35%
932
May16th to endNight
52%
562
26%
1684
20%
561
65%
561
42%
918
June1st to 15thNight
70%
540
24%
1620
25%
540
75%
540
57%
757
June16th to endNight
73%
540
28%
1620
30%
540
76%
540
48%
824
July1st to 15thNight
78%
510
26%
1530
28%
510
81%
510
51%
771
July16th to endNight
88%
564
33%
1594
39%
531
90%
531
58%
738
August1st to 15thNight
90%
539
37%
1610
43%
536
91%
536
60%
733
August16th to endNight
79%
573
30%
1938
35%
573
81%
573
40%
1004
September1st to 15thNight
74%
530
24%
1943
29%
530
76%
530
36%
1021
September16th to endNight
71%
492
33%
1815
33%
492
76%
492
40%
880
October1st to 15thNight
65%
530
37%
1850
32%
530
71%
530
45%
859
October16th to endNight
56%
704
37%
2112
22%
704
67%
704
49%
1038
November1st to 15thNight
54%
751
33%
2151
18%
751
64%
751
47%
1126
November16th to endNight
45%
900
34%
2340
16%
900
54%
900
42%
1342
December1st to 15thNight
41%
900
33%
2340
16%
900
50%
900
40%
1381
December16th to endNight
40%
960
29%
2496
13%
960
50%
960
37%
1505

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
7%313323335%61%
47779
Night
6%312212236%65%
47071
Cloud CoverDay
9%423324446%54%
47777
Night
8%313323347%58%
47071
TransparencyDay
30%39%23%23%9%
47477
Night
26%29%23%24%12%
46876
SeeingDay
9%318%31%27%9%
5519
Night
10%5%26%36%18%1
15539

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
11%31331222265%
1611
16th to endDay
7%3222223467%
1743
February1st to 15thDay
8%5%2321223363%
1750
16th to endDay
10%412211125%66%
1580
March1st to 15thDay
13%413313225%57%
1961
16th to endDay
6%313312235%65%
2112
April1st to 15thDay
7%312213245%63%
1971
16th to endDay
8%31331223463%
2253
May1st to 15thDay
10%42332333458%
2331
16th to endDay
7%4244245%5%7%52%
2430
June1st to 15thDay
2212423437%65%
2340
16th to endDay
3212323347%65%
2340
July1st to 15thDay
4213324437%62%
2340
16th to endDay
311322446%8%62%
2466
August1st to 15thDay
21232445%7%64%
2340
16th to endDay
6%4245%25%5%6%8%49%
2260
September1st to 15thDay
9%3134345%5%5%53%
1936
16th to endDay
7%214313446%59%
1815
October1st to 15thDay
8%4221233464%
1768
16th to endDay
6%21221212471%
1760
November1st to 15thDay
7%3331322465%
1704
16th to endDay
9%31332112367%
1620
December1st to 15thDay
14%6%1321222358%
1620
16th to endDay
10%5%1431233459%
1728
January1st to 15thNight
9%41321122464%
2327
16th to endNight
8%21221223469%
2490
February1st to 15thNight
9%41321122365%
2102
16th to endNight
9%21221213467%
1894
March1st to 15thNight
12%31321233459%
1998
16th to endNight
4212222235%68%
2112
April1st to 15thNight
6%213222235%66%
1977
16th to endNight
7%31231233465%
1702
May1st to 15thNight
6%31332335%5%62%
1619
16th to endNight
5%1232335%8%63%
1683
June1st to 15thNight
212212347%71%
1620
16th to endNight
112312247%72%
1620
July1st to 15thNight
3112312248%67%
1620
16th to endNight
1121235%9%69%
1702
August1st to 15thNight
111212238%73%
1620
16th to endNight
441332445%8%56%
1938
September1st to 15thNight
8%313422347%58%
1943
16th to endNight
6%313313347%59%
1815
October1st to 15thNight
6%312212235%68%
1850
16th to endNight
7%2122232470%
2112
November1st to 15thNight
5%21331223468%
2151
16th to endNight
10%213312235%63%
2340
December1st to 15thNight
11%41321223461%
2340
16th to endNight
9%5%1341234460%
2496

Percentage Cloud Cover SE (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
13%42431222357%
1611
16th to endDay
12%412223245%58%
1743
February1st to 15thDay
10%6%2421224456%
1750
16th to endDay
15%423211225%57%
1580
March1st to 15thDay
15%424324336%49%
1961
16th to endDay
11%5%24413335%53%
2110
April1st to 15thDay
9%423324447%54%
1971
16th to endDay
9%42343435%5%53%
2253
May1st to 15thDay
12%5%33434446%47%
2331
16th to endDay
10%425%4346%6%9%42%
2430
June1st to 15thDay
421342445%7%58%
2340
16th to endDay
7%223325%45%8%52%
2340
July1st to 15thDay
7%314435%5%5%8%51%
2340
16th to endDay
4213435%5%6%9%53%
2466
August1st to 15thDay
212336%46%9%59%
2340
16th to endDay
6%4245%35%5%6%8%45%
2260
September1st to 15thDay
10%3235%35%6%5%6%48%
1936
16th to endDay
8%314324446%56%
1815
October1st to 15thDay
10%412314345%59%
1768
16th to endDay
7%212212125%68%
1760
November1st to 15thDay
8%31341433460%
1704
16th to endDay
11%41331213461%
1620
December1st to 15thDay
15%7%13212335%52%
1620
16th to endDay
14%5%2442233452%
1728
January1st to 15thNight
11%5%23312236%58%
2327
16th to endNight
12%312222335%59%
2490
February1st to 15thNight
11%5%2332222459%
2102
16th to endNight
12%312312246%59%
1894
March1st to 15thNight
13%414313346%51%
1998
16th to endNight
8%323324247%57%
2112
April1st to 15thNight
7%324323347%58%
1977
16th to endNight
9%423323345%57%
1702
May1st to 15thNight
9%42432446%6%52%
1619
16th to endNight
6%21232446%9%54%
1683
June1st to 15thNight
211221335%9%65%
1620
16th to endNight
211442435%8%60%
1620
July1st to 15thNight
411331335%11%58%
1620
16th to endNight
21221336%12%62%
1702
August1st to 15thNight
111121335%9%67%
1620
16th to endNight
5%3233245%5%10%53%
1938
September1st to 15thNight
9%31342335%8%52%
1943
16th to endNight
6%41341335%9%56%
1815
October1st to 15thNight
7%312212346%63%
1850
16th to endNight
8%22112225%67%
2112
November1st to 15thNight
6%214322335%64%
2151
16th to endNight
10%313313335%59%
2340
December1st to 15thNight
12%5%23213245%55%
2340
16th to endNight
12%5%24422345%53%
2496

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
33%15%19%28%11%
1612
16th to endDay
30%16%18%28%14%
1743
February1st to 15thDay
31%25%19%26%13%
1751
16th to endDay
31%15%20%24%15%
1580
March1st to 15thDay
37%28%16%23%10%
1961
16th to endDay
33%38%21%22%9%
2112
April1st to 15thDay
30%210%23%18%13%
1971
16th to endDay
32%28%20%23%11%
2253
May1st to 15thDay
38%39%19%19%9%
2331
16th to endDay
36%414%22%19%2
2434
June1st to 15thDay
25%312%28%25%5%
2340
16th to endDay
29%312%26%21%6%
2340
July1st to 15thDay
29%415%31%17%2
2201
16th to endDay
23%5%17%31%20%2
2311
August1st to 15thDay
21%412%33%23%4
2326
16th to endDay
33%413%28%16%2
2260
September1st to 15thDay
34%5%9%23%19%7%
1936
16th to endDay
27%38%21%27%10%
1815
October1st to 15thDay
27%29%24%20%15%
1768
16th to endDay
21%15%20%30%20%
1760
November1st to 15thDay
28%26%25%24%12%
1704
16th to endDay
29%1417%27%19%
1620
December1st to 15thDay
35%16%22%24%8%
1620
16th to endDay
37%15%21%25%8%
1728
January1st to 15thNight
29%15%18%27%17%
2327
16th to endNight
28%25%17%28%17%
2490
February1st to 15thNight
30%16%15%26%18%
2112
16th to endNight
29%17%19%24%17%
1894
March1st to 15thNight
34%28%17%22%13%
1998
16th to endNight
29%311%21%26%8%
2112
April1st to 15thNight
28%29%22%21%15%
1977
16th to endNight
29%310%19%26%11%
1702
May1st to 15thNight
31%411%20%20%10%
1620
16th to endNight
26%417%24%21%5%
1685
June1st to 15thNight
16%315%33%23%8%
1620
16th to endNight
22%411%30%25%6%
1620
July1st to 15thNight
21%313%37%19%4
1530
16th to endNight
14%417%36%23%3
1594
August1st to 15thNight
14%311%35%28%6%
1610
16th to endNight
27%313%30%20%4
1938
September1st to 15thNight
30%310%24%21%9%
1943
16th to endNight
25%37%22%26%14%
1815
October1st to 15thNight
22%210%25%20%18%
1850
16th to endNight
21%1418%29%24%
2112
November1st to 15thNight
24%26%25%25%15%
2151
16th to endNight
29%16%15%28%18%
2340
December1st to 15thNight
32%17%22%23%12%
2340
16th to endNight
34%17%20%23%13%
2496

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
16%7%32%33%5%4
90
16th to endDay
8%6%46%23%13%1
96
February1st to 15thDay
6%8%36%38%8%
90
16th to endDay
13%348%25%8%
81
March1st to 15thDay
20%13%28%26%8%2
90
16th to endDay
39%37%35%10%4
96
April1st to 15thDay
13%11%26%28%20%
90
16th to endDay
11%12%38%26%10%1
363
May1st to 15thDay
16%7%35%26%11%2
468
16th to endDay
14%233%29%16%4
517
June1st to 15thDay
415%43%29%7%
495
16th to endDay
7%19%37%32%10%
495
July1st to 15thDay
6%6%39%36%10%
475
16th to endDay
2325%48%19%
515
August1st to 15thDay
3229%46%17%
493
16th to endDay
12%432%30%20%
300
September1st to 15thDay
1114%47%34%
123
16th to endDay
5%112%45%35%
90
October1st to 15thDay
41332%43%15%
90
16th to endDay
17%116%28%29%7%
96
November1st to 15thDay
20%323%35%13%4
90
16th to endDay
22%14%27%21%11%3
90
December1st to 15thDay
25%424%30%10%5%
90
16th to endDay
9%13%39%28%9%
96
January1st to 15thNight
14%9%28%37%9%
900
16th to endNight
13%8%33%36%7%
954
February1st to 15thNight
14%8%37%33%6%
704
16th to endNight
14%9%44%28%3
632
March1st to 15thNight
17%9%36%28%6%
558
16th to endNight
10%10%39%33%6%
576
April1st to 15thNight
10%9%44%29%5%
539
16th to endNight
10%8%44%27%8%
540
May1st to 15thNight
10%442%33%7%
540
16th to endNight
7%133%36%18%1
563
June1st to 15thNight
219%49%24%2
540
16th to endNight
413%47%30%3
540
July1st to 15thNight
5%9%44%37%3
510
16th to endNight
2346%43%4
564
August1st to 15thNight
2238%50%5%
539
16th to endNight
7%436%46%5%
573
September1st to 15thNight
11%437%41%4
530
16th to endNight
8%9%38%39%2
492
October1st to 15thNight
9%217%43%24%3
530
16th to endNight
9%425%36%20%1
704
November1st to 15thNight
7%329%38%19%1
751
16th to endNight
13%6%31%35%12%1
900
December1st to 15thNight
17%5%31%36%9%
900
16th to endNight
16%6%31%36%9%
960
Page generated at 2017-09-13 06:39:12. Version ac04

Copyright 2017 A. Danko


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