Daingerfield State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Daingerfield State Park clear sky chart from 2005-11-05 to 2017-09-21.

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
50%
15584
27%
46925
19%
15536
58%
15536
35%
26685

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
33%
900
27%
2327
11%
895
44%
895
32%
1455
January16th to endNight
30%
960
29%
2496
11%
960
41%
960
32%
1560
February1st to 15thNight
30%
873
25%
2280
8%
868
40%
868
33%
1416
February16th to endNight
26%
526
30%
1788
12%
526
43%
526
27%
1024
March1st to 15thNight
33%
540
27%
1980
17%
540
46%
540
24%
1150
March16th to endNight
36%
576
23%
2112
17%
576
47%
576
26%
1216
April1st to 15thNight
35%
539
26%
1889
17%
539
51%
539
33%
991
April16th to endNight
38%
540
25%
1800
17%
540
52%
540
31%
1005
May1st to 15thNight
41%
540
23%
1668
16%
540
54%
540
31%
991
May16th to endNight
55%
563
25%
1683
22%
561
62%
561
36%
971
June1st to 15thNight
74%
540
24%
1620
24%
540
78%
540
47%
831
June16th to endNight
76%
540
25%
1620
27%
540
79%
540
45%
858
July1st to 15thNight
77%
510
21%
1530
24%
510
79%
510
41%
850
July16th to endNight
84%
564
27%
1594
32%
531
87%
531
48%
827
August1st to 15thNight
86%
539
31%
1610
35%
536
86%
536
57%
751
August16th to endNight
74%
573
23%
1893
29%
573
74%
573
31%
1108
September1st to 15thNight
73%
540
24%
1899
28%
540
74%
540
37%
998
September16th to endNight
72%
510
35%
1881
37%
510
77%
510
41%
910
October1st to 15thNight
61%
641
32%
1961
25%
641
65%
641
41%
1048
October16th to endNight
55%
704
37%
2112
23%
704
65%
704
44%
1077
November1st to 15thNight
51%
700
31%
2100
21%
700
60%
700
40%
1135
November16th to endNight
39%
806
32%
2246
16%
806
51%
806
33%
1348
December1st to 15thNight
36%
900
26%
2340
12%
900
45%
900
30%
1524
December16th to endNight
33%
960
24%
2496
10%
960
41%
960
29%
1641

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
12%5%2442445%6%45%
47933
Night
10%424323347%52%
47123
TransparencyDay
38%39%22%20%5%
47633
Night
32%39%23%22%9%
46928
SeeingDay
12%5%17%27%27%10%
5615
Night
14%6%23%31%20%2
15584

By Month

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
16%5%2332333451%
1611
16th to endDay
20%5%1333335%49%
1728
February1st to 15thDay
18%7%35%32323346%
1591
16th to endDay
18%6%25%42233446%
1685
March1st to 15thDay
21%6%24313335%44%
1980
16th to endDay
17%6%26%5%24345%41%
2110
April1st to 15thDay
12%5%25%424348%46%
2058
16th to endDay
13%6%24435%35%7%43%
2160
May1st to 15thDay
15%6%36%5%25%445%40%
2280
16th to endDay
11%5%25%5%35%5%6%7%40%
2430
June1st to 15thDay
6%3246%25%6%7%9%46%
2340
16th to endDay
6%3245%46%6%6%10%42%
2340
July1st to 15thDay
8%5%25%6%47%7%6%10%35%
2340
16th to endDay
7%315%5%36%6%8%9%41%
2466
August1st to 15thDay
5%2135%35%5%6%9%51%
2340
16th to endDay
10%6%25%5%36%7%7%9%34%
2308
September1st to 15thDay
12%425%42435%7%46%
2058
16th to endDay
8%413424446%54%
1871
October1st to 15thDay
13%313324346%52%
1658
16th to endDay
11%32331223362%
1760
November1st to 15thDay
13%424423345%51%
1758
16th to endDay
16%423312325%53%
1713
December1st to 15thDay
19%8%2431323446%
1620
16th to endDay
17%6%35%42333444%
1728
January1st to 15thNight
15%5%24323325%52%
2327
16th to endNight
18%42422233351%
2496
February1st to 15thNight
14%6%2431234452%
2271
16th to endNight
16%5%14323325%51%
1788
March1st to 15thNight
17%6%24312236%47%
1980
16th to endNight
11%6%25%424437%47%
2112
April1st to 15thNight
7%32342345%7%53%
1889
16th to endNight
10%5%24423447%50%
1800
May1st to 15thNight
10%5%2442445%6%49%
1667
16th to endNight
8%3143245%7%10%47%
1683
June1st to 15thNight
321331345%8%61%
1620
16th to endNight
431232445%11%55%
1620
July1st to 15thNight
43245%245%6%11%49%
1620
16th to endNight
2213225%5%6%13%54%
1702
August1st to 15thNight
321122246%11%61%
1620
16th to endNight
7%425%435%6%7%10%42%
1893
September1st to 15thNight
10%413314448%53%
1899
16th to endNight
6%313322348%59%
1881
October1st to 15thNight
8%413422345%59%
1961
16th to endNight
12%31211223464%
2112
November1st to 15thNight
8%324333336%57%
2100
16th to endNight
14%5%2442323454%
2246
December1st to 15thNight
15%6%35%422336%46%
2340
16th to endNight
17%6%24424345%45%
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
38%25%20%25%7%
1612
16th to endDay
39%1420%25%7%
1728
February1st to 15thDay
45%1319%22%7%
1592
16th to endDay
42%2418%22%8%
1685
March1st to 15thDay
44%16%19%20%7%
1980
16th to endDay
45%27%18%22%3
2112
April1st to 15thDay
38%28%22%19%8%
2058
16th to endDay
41%28%20%22%4
2160
May1st to 15thDay
46%29%16%18%6%
2280
16th to endDay
40%412%24%15%1
2434
June1st to 15thDay
32%5%12%29%18%1
2340
16th to endDay
35%5%12%23%20%2
2340
July1st to 15thDay
39%5%15%27%12%
2201
16th to endDay
33%420%26%13%
2311
August1st to 15thDay
28%414%34%16%2
2326
16th to endDay
42%5%15%23%10%2
2308
September1st to 15thDay
37%311%22%16%8%
2058
16th to endDay
30%38%24%24%9%
1871
October1st to 15thDay
33%28%18%21%15%
1658
16th to endDay
29%1320%32%13%
1760
November1st to 15thDay
35%27%23%22%8%
1758
16th to endDay
36%2316%29%10%
1713
December1st to 15thDay
44%17%18%21%6%
1620
16th to endDay
45%15%21%19%5%
1728
January1st to 15thNight
37%16%16%28%9%
2327
16th to endNight
38%1418%25%11%
2496
February1st to 15thNight
36%16%22%21%10%
2281
16th to endNight
37%16%21%21%11%
1788
March1st to 15thNight
39%27%18%20%10%
1980
16th to endNight
37%38%21%22%5%
2112
April1st to 15thNight
30%210%24%20%10%
1889
16th to endNight
34%29%22%23%7%
1800
May1st to 15thNight
35%310%21%17%10%
1668
16th to endNight
30%5%16%26%18%3
1685
June1st to 15thNight
20%5%12%33%23%3
1620
16th to endNight
24%414%26%25%4
1620
July1st to 15thNight
27%416%33%15%1
1530
16th to endNight
20%6%20%31%18%2
1594
August1st to 15thNight
16%318%34%21%4
1610
16th to endNight
33%6%14%26%15%3
1893
September1st to 15thNight
28%313%24%19%9%
1899
16th to endNight
25%28%24%26%12%
1881
October1st to 15thNight
27%28%20%22%17%
1961
16th to endNight
24%1419%28%20%
2112
November1st to 15thNight
29%19%22%26%11%
2100
16th to endNight
36%1415%29%13%
2246
December1st to 15thNight
41%18%21%19%8%
2340
16th to endNight
42%27%19%20%8%
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%12%37%21%12%
90
16th to endDay
18%20%38%13%7%1
96
February1st to 15thDay
16%16%44%17%4
90
16th to endDay
16%22%40%13%7%
81
March1st to 15thDay
27%15%43%7%41
90
16th to endDay
10%17%30%30%11%
96
April1st to 15thDay
18%10%32%25%11%1
177
16th to endDay
20%8%31%23%13%2
270
May1st to 15thDay
16%7%36%27%10%2
417
16th to endDay
15%426%31%18%4
517
June1st to 15thDay
8%29%36%33%9%
495
16th to endDay
6%111%33%33%13%
495
July1st to 15thDay
8%17%34%37%10%
475
16th to endDay
5%1324%44%20%
515
August1st to 15thDay
8%425%42%18%
493
16th to endDay
16%1418%40%18%
348
September1st to 15thDay
7%422%42%22%
213
16th to endDay
37%28%40%19%
105
October1st to 15thDay
213%48%26%8%
90
16th to endDay
17%216%35%22%5%
96
November1st to 15thDay
22%6%28%25%15%1
90
16th to endDay
25%13%27%23%6%3
90
December1st to 15thDay
27%6%32%17%10%5%
90
16th to endDay
19%25%30%20%31
96
January1st to 15thNight
20%12%29%29%8%
900
16th to endNight
21%10%34%27%5%
960
February1st to 15thNight
19%10%34%28%6%
873
16th to endNight
22%10%37%25%3
526
March1st to 15thNight
21%9%31%30%7%
540
16th to endNight
14%8%34%33%7%
576
April1st to 15thNight
9%10%39%29%9%
539
16th to endNight
14%8%34%28%12%1
540
May1st to 15thNight
12%6%34%32%12%1
540
16th to endNight
7%327%38%22%1
563
June1st to 15thNight
6%10%38%40%3
540
16th to endNight
5%110%35%40%7%
540
July1st to 15thNight
5%5%41%41%5%
510
16th to endNight
3426%51%12%
564
August1st to 15thNight
4233%50%8%
539
16th to endNight
10%231%45%8%
573
September1st to 15thNight
12%15%27%46%6%
540
16th to endNight
7%111%30%42%6%
510
October1st to 15thNight
11%117%38%26%4
641
16th to endNight
14%5%21%30%24%2
704
November1st to 15thNight
11%5%26%38%16%2
700
16th to endNight
18%8%28%28%13%1
806
December1st to 15thNight
20%9%27%34%7%
900
16th to endNight
21%10%30%28%7%
960
Page generated at 2017-09-22 06:35:33. Version ac04

Copyright 2017 A. Danko


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