Palo Duro Canyon State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Palo Duro Canyon State Park clear sky chart from 2005-11-05 to 2018-01-12.

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%
16225
32%
48200
20%
16178
64%
16178
45%
24858

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
49%
956
32%
2472
15%
951
60%
951
49%
1327
January16th to endNight
47%
831
39%
2367
19%
831
63%
831
51%
1177
February1st to 15thNight
43%
704
31%
2112
16%
700
58%
700
41%
1114
February16th to endNight
39%
632
36%
1894
14%
632
57%
632
41%
980
March1st to 15thNight
41%
711
31%
2151
16%
711
53%
711
41%
1111
March16th to endNight
35%
576
30%
2052
15%
576
54%
576
35%
994
April1st to 15thNight
33%
539
30%
1798
14%
539
53%
539
37%
904
April16th to endNight
34%
540
30%
1791
18%
540
54%
540
41%
865
May1st to 15thNight
42%
540
30%
1620
19%
540
60%
540
43%
856
May16th to endNight
48%
563
26%
1684
19%
561
60%
561
41%
915
June1st to 15thNight
52%
540
21%
1620
14%
540
61%
540
44%
843
June16th to endNight
65%
540
27%
1501
21%
540
71%
540
53%
762
July1st to 15thNight
76%
510
25%
1437
23%
510
79%
510
47%
781
July16th to endNight
83%
564
29%
1594
31%
531
84%
531
51%
797
August1st to 15thNight
79%
539
26%
1772
31%
536
81%
536
42%
907
August16th to endNight
78%
573
25%
1910
30%
573
80%
573
38%
1029
September1st to 15thNight
69%
540
25%
1875
26%
540
73%
540
33%
1044
September16th to endNight
66%
537
35%
1980
33%
537
73%
537
42%
928
October1st to 15thNight
52%
540
34%
1980
25%
540
65%
540
40%
939
October16th to endNight
59%
810
40%
2346
22%
810
69%
810
59%
1079
November1st to 15thNight
54%
950
34%
2470
15%
950
64%
950
58%
1246
November16th to endNight
52%
975
40%
2535
18%
975
64%
975
54%
1299
December1st to 15thNight
48%
975
34%
2535
16%
975
59%
975
46%
1408
December16th to endNight
40%
1040
36%
2704
16%
1040
54%
1040
42%
1553

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
5%313323347%60%
49124
Night
5%313323347%62%
48393
Cloud CoverDay
6%313323347%60%
49122
Night
5%312323347%62%
48393
TransparencyDay
24%49%23%26%12%
48819
Night
22%49%21%26%15%
48201
SeeingDay
7%5%25%34%21%5%
6011
Night
6%6%29%39%16%
16225

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
5%413313345%63%
1710
16th to endDay
3323313245%65%
1866
February1st to 15thDay
5%423213235%64%
1750
16th to endDay
45%22313335%64%
1580
March1st to 15thDay
7%31332335%7%58%
1807
16th to endDay
6%42422233464%
2169
April1st to 15thDay
6%312323347%59%
2150
16th to endDay
5%31231335%5%64%
2169
May1st to 15thDay
7%413313346%58%
2331
16th to endDay
7%22332345%7%58%
2430
June1st to 15thDay
43123245%48%56%
2340
16th to endDay
321232445%8%60%
2451
July1st to 15thDay
6%31442445%9%52%
2430
16th to endDay
321233446%11%55%
2466
August1st to 15thDay
32135%25%5%6%11%51%
2176
16th to endDay
5%424435%46%8%50%
2292
September1st to 15thDay
10%3135%2445%7%49%
2084
16th to endDay
8%313223346%61%
1980
October1st to 15thDay
9%313322235%60%
1980
16th to endDay
22221233474%
1863
November1st to 15thDay
1313212247%67%
1718
16th to endDay
6%22221113470%
1755
December1st to 15thDay
6%313223336%61%
1755
16th to endDay
7%6%23223345%57%
1872
January1st to 15thNight
4313223436%64%
2472
16th to endNight
4212223235%67%
2367
February1st to 15thNight
5%414313335%62%
2102
16th to endNight
6%413224346%60%
1894
March1st to 15thNight
6%323224336%61%
2151
16th to endNight
7%323313445%61%
2052
April1st to 15thNight
6%31322235%7%60%
1798
16th to endNight
6%212313346%64%
1791
May1st to 15thNight
7%412213346%62%
1619
16th to endNight
6%31321446%8%57%
1683
June1st to 15thNight
41232347%11%58%
1620
16th to endNight
21222346%12%60%
1501
July1st to 15thNight
5%31221346%10%57%
1524
16th to endNight
211222345%10%62%
1702
August1st to 15thNight
22134245%7%11%54%
1782
16th to endNight
4212435%5%6%10%52%
1910
September1st to 15thNight
7%4144245%5%8%51%
1875
16th to endNight
7%31231335%6%61%
1980
October1st to 15thNight
8%413312235%64%
1980
16th to endNight
312212335%73%
2346
November1st to 15thNight
322212246%70%
2470
16th to endNight
4212213236%68%
2535
December1st to 15thNight
6%312323346%62%
2535
16th to endNight
7%5%23323245%58%
2704

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
5%313323345%63%
1710
16th to endDay
3323312345%66%
1866
February1st to 15thDay
5%424213226%64%
1750
16th to endDay
45%22323335%64%
1580
March1st to 15thDay
7%313323447%58%
1807
16th to endDay
6%323312335%64%
2167
April1st to 15thDay
6%313313447%60%
2150
16th to endDay
6%21122335%5%64%
2169
May1st to 15thDay
8%413313346%59%
2331
16th to endDay
7%31332335%7%58%
2430
June1st to 15thDay
5%3133245%48%57%
2340
16th to endDay
32123245%5%8%60%
2451
July1st to 15thDay
7%22442446%9%53%
2430
16th to endDay
3212325%5%6%11%55%
2466
August1st to 15thDay
4213425%5%7%10%52%
2176
16th to endDay
5%414435%5%6%8%50%
2292
September1st to 15thDay
10%3234345%5%7%49%
2084
16th to endDay
8%31322235%5%61%
1980
October1st to 15thDay
9%323322235%61%
1980
16th to endDay
221221223474%
1863
November1st to 15thDay
2213212247%67%
1718
16th to endDay
6%22221123470%
1755
December1st to 15thDay
6%313323345%62%
1755
16th to endDay
7%6%23313345%57%
1872
January1st to 15thNight
4313223346%63%
2472
16th to endNight
5%213213235%68%
2367
February1st to 15thNight
6%41431333463%
2102
16th to endNight
6%412324347%60%
1894
March1st to 15thNight
6%322323336%61%
2151
16th to endNight
7%422322445%61%
2052
April1st to 15thNight
6%322322347%60%
1798
16th to endNight
7%212223346%64%
1791
May1st to 15thNight
7%412223246%62%
1619
16th to endNight
7%31231446%8%58%
1683
June1st to 15thNight
41222347%10%58%
1620
16th to endNight
21222346%11%60%
1501
July1st to 15thNight
5%21222347%10%56%
1524
16th to endNight
311222436%9%61%
1702
August1st to 15thNight
31233245%7%11%53%
1782
16th to endNight
4213425%5%7%10%52%
1910
September1st to 15thNight
7%4144245%5%8%51%
1875
16th to endNight
7%21222335%6%62%
1980
October1st to 15thNight
8%41321223464%
1980
16th to endNight
311212335%73%
2346
November1st to 15thNight
322212245%70%
2470
16th to endNight
4212213236%69%
2535
December1st to 15thNight
6%312313346%62%
2535
16th to endNight
7%5%23322346%58%
2704

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
23%27%27%27%10%
1711
16th to endDay
20%36%22%33%13%
1866
February1st to 15thDay
23%28%23%27%14%
1751
16th to endDay
22%25%23%30%15%
1580
March1st to 15thDay
25%36%20%30%13%
1807
16th to endDay
24%27%24%24%16%
2169
April1st to 15thDay
24%47%15%28%20%
2150
16th to endDay
20%39%23%28%14%
2169
May1st to 15thDay
26%5%8%18%25%16%
2331
16th to endDay
25%5%10%20%22%15%
2434
June1st to 15thDay
24%5%11%24%18%13%
2340
16th to endDay
20%6%12%26%21%14%
2451
July1st to 15thDay
27%5%11%25%21%7%
2288
16th to endDay
19%7%15%30%21%4
2311
August1st to 15thDay
24%7%14%28%19%5%
2162
16th to endDay
29%7%12%22%22%6%
2292
September1st to 15thDay
32%6%12%24%16%6%
2084
16th to endDay
24%48%24%28%9%
1980
October1st to 15thDay
27%37%20%28%12%
1980
16th to endDay
14%26%21%36%18%
1863
November1st to 15thDay
17%37%20%34%17%
1718
16th to endDay
19%1419%34%20%
1755
December1st to 15thDay
24%29%25%28%9%
1755
16th to endDay
29%36%25%25%10%
1872
January1st to 15thNight
21%27%22%32%12%
2472
16th to endNight
20%26%20%33%17%
2367
February1st to 15thNight
26%26%19%27%16%
2112
16th to endNight
25%25%19%27%19%
1894
March1st to 15thNight
24%36%21%27%16%
2151
16th to endNight
25%39%25%19%17%
2052
April1st to 15thNight
23%5%9%20%23%18%
1798
16th to endNight
22%310%20%24%17%
1791
May1st to 15thNight
23%5%8%15%26%19%
1620
16th to endNight
24%6%13%17%20%17%
1685
June1st to 15thNight
19%8%17%21%19%13%
1620
16th to endNight
16%6%15%25%20%14%
1501
July1st to 15thNight
21%7%11%28%21%9%
1437
16th to endNight
17%6%14%29%25%5%
1594
August1st to 15thNight
21%7%16%24%20%8%
1772
16th to endNight
25%7%13%26%20%5%
1910
September1st to 15thNight
30%6%12%26%16%8%
1875
16th to endNight
21%49%22%30%10%
1980
October1st to 15thNight
24%211%18%24%17%
1980
16th to endNight
13%35%19%38%19%
2346
November1st to 15thNight
15%37%21%32%18%
2470
16th to endNight
18%2319%33%23%
2535
December1st to 15thNight
23%37%22%27%14%
2535
16th to endNight
27%37%20%29%12%
2704

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
13%6%29%30%19%
123
16th to endDay
5%10%45%25%10%3
96
February1st to 15thDay
6%8%33%34%13%3
90
16th to endDay
412%33%38%11%
81
March1st to 15thDay
36%45%33%11%
90
16th to endDay
8%11%37%26%14%1
153
April1st to 15thDay
9%15%44%24%6%
269
16th to endDay
9%18%39%23%6%1
279
May1st to 15thDay
9%9%36%33%10%
468
16th to endDay
11%6%33%29%16%2
517
June1st to 15thDay
5%429%38%19%3
495
16th to endDay
5%120%35%29%6%
495
July1st to 15thDay
6%11%42%30%9%
475
16th to endDay
315%34%41%13%
515
August1st to 15thDay
5%8%41%34%9%
331
16th to endDay
7%114%36%28%10%
332
September1st to 15thDay
5%10%46%27%9%
239
16th to endDay
17%215%32%24%8%
135
October1st to 15thDay
9%32%34%19%2
135
16th to endDay
4329%34%23%4
144
November1st to 15thDay
5%6%31%31%18%6%
135
16th to endDay
11%16%25%33%11%2
135
December1st to 15thDay
46%41%34%11%1
135
16th to endDay
9%16%40%27%6%
144
January1st to 15thNight
6%9%31%41%11%
956
16th to endNight
6%6%36%39%10%
831
February1st to 15thNight
8%10%35%38%7%
704
16th to endNight
8%10%39%36%4
632
March1st to 15thNight
8%10%36%37%6%
711
16th to endNight
7%14%39%32%5%
576
April1st to 15thNight
8%13%41%31%4
539
16th to endNight
9%10%44%31%4
540
May1st to 15thNight
8%8%38%35%9%
540
16th to endNight
7%6%34%38%12%
563
June1st to 15thNight
4436%42%12%
540
16th to endNight
2127%46%20%
540
July1st to 15thNight
6%110%50%30%
510
16th to endNight
38%42%44%1
564
August1st to 15thNight
29%44%41%
539
16th to endNight
5%19%43%39%1
573
September1st to 15thNight
7%113%42%32%2
540
16th to endNight
8%119%42%25%2
537
October1st to 15thNight
10%330%41%12%1
540
16th to endNight
46%27%38%21%1
810
November1st to 15thNight
5%6%30%38%19%
950
16th to endNight
6%8%30%38%15%
975
December1st to 15thNight
8%8%31%39%11%
975
16th to endNight
10%8%36%35%8%
1040
Page generated at 2018-01-12 21:01:29. Version ac04

Copyright 2018 A. Danko


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