Caprock Canyons State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Caprock Canyons State Park clear sky chart from 2005-11-05 to 2018-10-08.

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%
17063
32%
51130
19%
17016
63%
17016
45%
26086

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
48%
975
34%
2522
16%
970
60%
970
50%
1347
January16th to endNight
43%
916
41%
2580
19%
916
61%
916
53%
1267
February1st to 15thNight
40%
764
31%
2292
14%
760
55%
760
40%
1207
February16th to endNight
37%
684
35%
2050
13%
684
54%
684
41%
1054
March1st to 15thNight
34%
748
31%
2308
14%
748
49%
748
39%
1204
March16th to endNight
34%
624
30%
2263
16%
624
53%
624
35%
1090
April1st to 15thNight
30%
584
31%
1948
13%
584
54%
584
38%
964
April16th to endNight
33%
579
31%
1900
16%
579
55%
579
42%
918
May1st to 15thNight
36%
585
31%
1755
16%
585
58%
585
42%
921
May16th to endNight
47%
611
27%
1828
18%
609
62%
609
45%
955
June1st to 15thNight
52%
585
24%
1755
16%
585
63%
585
47%
893
June16th to endNight
65%
585
25%
1755
22%
585
71%
585
52%
854
July1st to 15thNight
74%
555
23%
1665
22%
555
78%
555
46%
865
July16th to endNight
86%
612
31%
1738
34%
579
87%
579
56%
822
August1st to 15thNight
79%
575
29%
1864
35%
572
80%
572
42%
952
August16th to endNight
76%
621
25%
2070
29%
621
79%
621
40%
1082
September1st to 15thNight
68%
585
25%
2055
26%
585
72%
585
31%
1157
September16th to endNight
63%
582
33%
2145
30%
582
71%
582
42%
1006
October1st to 15thNight
53%
564
35%
2068
27%
564
65%
564
41%
972
October16th to endNight
55%
789
41%
2325
20%
789
68%
789
58%
1062
November1st to 15thNight
50%
950
35%
2470
13%
950
61%
950
56%
1238
November16th to endNight
48%
975
41%
2535
16%
975
61%
975
53%
1297
December1st to 15thNight
45%
975
36%
2535
15%
975
58%
975
48%
1385
December16th to endNight
39%
1040
35%
2704
14%
1040
53%
1040
41%
1574

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
6%313323346%59%
52001
Night
6%313313347%61%
51326
Cloud CoverDay
7%313323346%60%
51999
Night
6%312313346%61%
51326
TransparencyDay
24%38%23%25%13%
51699
Night
22%38%22%26%16%
51131
SeeingDay
7%5%24%33%22%5%
7030
Night
7%7%30%37%16%
17063

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%5%2322333463%
1746
16th to endDay
4312323236%65%
2005
February1st to 15thDay
5%413322235%66%
1900
16th to endDay
6%5%13323235%60%
1710
March1st to 15thDay
8%413313347%57%
1980
16th to endDay
7%413223245%61%
2311
April1st to 15thDay
7%313322236%62%
2330
16th to endDay
7%32224445%62%
2333
May1st to 15thDay
9%423224335%57%
2526
16th to endDay
7%31332445%7%55%
2638
June1st to 15thDay
5%31232345%8%57%
2535
16th to endDay
421332445%9%60%
2535
July1st to 15thDay
7%213425%5%6%8%50%
2535
16th to endDay
211233446%9%61%
2674
August1st to 15thDay
4212325%5%6%9%55%
2336
16th to endDay
6%3144345%6%8%51%
2484
September1st to 15thDay
12%31342346%8%48%
2233
16th to endDay
8%313323346%59%
2145
October1st to 15thDay
10%31331233361%
2061
16th to endDay
3212212235%71%
1884
November1st to 15thDay
4312213346%66%
1718
16th to endDay
5%21221223469%
1755
December1st to 15thDay
7%323323336%60%
1755
16th to endDay
8%6%24322325%58%
1872
January1st to 15thNight
5%212313346%64%
2522
16th to endNight
5%212212245%69%
2580
February1st to 15thNight
6%41332333462%
2282
16th to endNight
7%5%12213346%60%
2050
March1st to 15thNight
6%424323346%58%
2308
16th to endNight
8%213313345%60%
2263
April1st to 15thNight
5%323323346%61%
1948
16th to endNight
7%212313246%63%
1900
May1st to 15thNight
9%21221235%6%60%
1754
16th to endNight
7%31231335%7%61%
1827
June1st to 15thNight
32332347%9%57%
1755
16th to endNight
2122145%5%12%59%
1755
July1st to 15thNight
421342446%10%55%
1755
16th to endNight
21221445%10%63%
1846
August1st to 15thNight
4213425%5%6%10%54%
1874
16th to endNight
5%31343445%9%54%
2070
September1st to 15thNight
10%32442445%7%48%
2055
16th to endNight
7%312322346%61%
2145
October1st to 15thNight
10%312212235%64%
2068
16th to endNight
311221223474%
2325
November1st to 15thNight
4212212346%70%
2470
16th to endNight
4212113335%69%
2535
December1st to 15thNight
7%312223235%63%
2535
16th to endNight
8%6%24313246%56%
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%5%2322233463%
1746
16th to endDay
4312223336%65%
2005
February1st to 15thDay
5%313222235%66%
1900
16th to endDay
6%5%13322335%61%
1710
March1st to 15thDay
8%423312338%57%
1980
16th to endDay
7%413223245%61%
2309
April1st to 15thDay
7%313322236%62%
2330
16th to endDay
7%32324335%62%
2333
May1st to 15thDay
10%423324335%57%
2526
16th to endDay
7%31332445%7%55%
2638
June1st to 15thDay
5%32232435%9%57%
2535
16th to endDay
421332435%8%61%
2535
July1st to 15thDay
7%213435%5%6%8%51%
2535
16th to endDay
211332445%9%61%
2674
August1st to 15thDay
4212325%5%7%8%55%
2336
16th to endDay
7%213435%5%5%8%51%
2484
September1st to 15thDay
12%31442436%7%48%
2233
16th to endDay
8%213313446%59%
2145
October1st to 15thDay
10%31331223462%
2061
16th to endDay
421221233471%
1884
November1st to 15thDay
4312213336%66%
1718
16th to endDay
6%21221233469%
1755
December1st to 15thDay
7%313323336%60%
1755
16th to endDay
8%7%23322325%58%
1872
January1st to 15thNight
5%312213446%64%
2522
16th to endNight
5%21121233469%
2580
February1st to 15thNight
6%42332333462%
2282
16th to endNight
7%423213346%60%
2050
March1st to 15thNight
6%414323346%59%
2308
16th to endNight
8%213323345%59%
2263
April1st to 15thNight
5%32232335%6%61%
1948
16th to endNight
7%212322347%63%
1900
May1st to 15thNight
9%21221335%7%60%
1754
16th to endNight
7%21231245%7%60%
1827
June1st to 15thNight
321332447%9%58%
1755
16th to endNight
3113145%6%11%59%
1755
July1st to 15thNight
421232446%10%55%
1755
16th to endNight
21222346%9%63%
1846
August1st to 15thNight
4213425%5%5%10%54%
1874
16th to endNight
6%21343446%9%54%
2070
September1st to 15thNight
10%3145%245%5%7%49%
2055
16th to endNight
8%21232235%6%61%
2145
October1st to 15thNight
10%313212335%64%
2068
16th to endNight
31221223474%
2325
November1st to 15thNight
4311112336%69%
2470
16th to endNight
5%212212345%69%
2535
December1st to 15thNight
7%312223235%63%
2535
16th to endNight
8%6%23213346%56%
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
24%26%25%27%12%
1747
16th to endDay
22%25%21%32%16%
2005
February1st to 15thDay
22%28%25%25%15%
1901
16th to endDay
26%1420%28%18%
1710
March1st to 15thDay
27%1420%30%14%
1980
16th to endDay
25%26%26%22%15%
2311
April1st to 15thDay
24%37%17%26%20%
2330
16th to endDay
24%37%23%26%14%
2333
May1st to 15thDay
29%35%19%24%16%
2526
16th to endDay
26%5%10%22%20%14%
2642
June1st to 15thDay
23%5%12%25%21%11%
2535
16th to endDay
20%5%12%27%21%12%
2535
July1st to 15thDay
28%5%11%27%21%6%
2396
16th to endDay
17%414%32%25%4
2519
August1st to 15thDay
22%6%15%27%20%7%
2322
16th to endDay
29%5%12%26%20%6%
2484
September1st to 15thDay
32%5%10%24%18%7%
2233
16th to endDay
26%37%24%28%10%
2145
October1st to 15thDay
27%38%23%24%13%
2061
16th to endDay
17%25%19%34%20%
1884
November1st to 15thDay
19%25%21%33%17%
1718
16th to endDay
19%2317%34%21%
1755
December1st to 15thDay
26%27%24%27%11%
1755
16th to endDay
30%26%23%26%10%
1872
January1st to 15thNight
21%26%23%30%15%
2522
16th to endNight
19%16%18%33%20%
2580
February1st to 15thNight
26%37%19%27%16%
2292
16th to endNight
25%25%20%26%20%
2050
March1st to 15thNight
26%26%19%26%19%
2308
16th to endNight
25%38%26%20%15%
2263
April1st to 15thNight
23%310%17%24%19%
1948
16th to endNight
22%37%22%27%16%
1900
May1st to 15thNight
24%48%18%24%19%
1755
16th to endNight
22%5%12%21%21%17%
1829
June1st to 15thNight
20%5%14%26%20%11%
1755
16th to endNight
17%5%13%26%21%15%
1755
July1st to 15thNight
23%413%27%22%9%
1665
16th to endNight
15%5%12%28%28%9%
1738
August1st to 15thNight
23%5%11%24%25%9%
1864
16th to endNight
25%5%13%25%21%8%
2070
September1st to 15thNight
32%5%11%22%18%9%
2055
16th to endNight
22%410%20%31%11%
2145
October1st to 15thNight
23%310%22%24%16%
2068
16th to endNight
14%2418%36%22%
2325
November1st to 15thNight
16%26%23%29%21%
2470
16th to endNight
18%2318%32%24%
2535
December1st to 15thNight
24%17%23%27%15%
2535
16th to endNight
29%25%20%28%13%
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%7%31%25%21%
135
16th to endDay
215%36%27%17%
144
February1st to 15thDay
38%34%38%14%
135
16th to endDay
11%12%41%23%10%
120
March1st to 15thDay
7%8%49%25%8%1
135
16th to endDay
13%11%32%29%11%
167
April1st to 15thDay
10%17%43%22%5%
329
16th to endDay
12%12%42%20%8%2
345
May1st to 15thDay
10%8%37%30%11%
543
16th to endDay
10%5%34%31%17%1
597
June1st to 15thDay
6%426%39%20%3
570
16th to endDay
5%119%37%30%6%
570
July1st to 15thDay
5%18%43%28%13%
550
16th to endDay
21337%42%12%
595
August1st to 15thDay
5%6%38%38%9%
401
16th to endDay
5%111%36%35%9%
396
September1st to 15thDay
7%19%33%37%10%
268
16th to endDay
12%319%31%24%8%
180
October1st to 15thDay
9%326%34%21%3
157
16th to endDay
9%29%30%25%4
144
November1st to 15thDay
15%5%29%25%15%8%
135
16th to endDay
10%17%31%24%13%2
135
December1st to 15thDay
5%346%32%11%
135
16th to endDay
9%18%39%29%4
144
January1st to 15thNight
6%9%31%40%11%
975
16th to endNight
6%7%39%37%9%
916
February1st to 15thNight
8%9%37%34%8%
764
16th to endNight
10%11%37%35%3
684
March1st to 15thNight
9%12%39%31%7%
748
16th to endNight
9%12%41%31%5%
624
April1st to 15thNight
6%14%44%31%3
584
16th to endNight
7%10%44%32%3
579
May1st to 15thNight
9%6%42%30%9%
585
16th to endNight
7%5%35%35%15%1
611
June1st to 15thNight
4334%42%15%
585
16th to endNight
3124%46%22%
585
July1st to 15thNight
5%19%50%30%1
555
16th to endNight
3446%41%2
612
August1st to 15thNight
5%15%42%44%1
575
16th to endNight
6%18%42%37%3
621
September1st to 15thNight
10%110%40%34%2
585
16th to endNight
8%118%41%26%2
582
October1st to 15thNight
13%327%39%14%1
564
16th to endNight
37%31%37%19%1
789
November1st to 15thNight
6%7%32%37%14%
950
16th to endNight
5%9%34%36%12%1
975
December1st to 15thNight
9%7%34%36%10%
975
16th to endNight
11%9%35%35%8%
1040
Page generated at 2018-10-09 09:39:13. Version ac04

Copyright 2018 A. Danko


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