Goblin Valley State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Goblin Valley State Park clear sky chart from 2005-11-05 to 2017-08-12.

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
67%
15538
28%
46778
24%
15502
72%
15502
44%
24568

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
70%
716
22%
2327
23%
716
74%
716
36%
1311
January16th to endNight
68%
768
28%
2496
28%
768
72%
768
36%
1376
February1st to 15thNight
66%
697
19%
2288
20%
697
69%
697
35%
1279
February16th to endNight
54%
632
29%
1908
23%
632
63%
632
39%
1073
March1st to 15thNight
64%
720
29%
1980
24%
720
69%
720
44%
1101
March16th to endNight
57%
768
28%
2112
17%
768
66%
768
46%
1155
April1st to 15thNight
51%
627
25%
1886
16%
627
58%
627
40%
1014
April16th to endNight
54%
540
35%
1668
21%
540
67%
540
47%
821
May1st to 15thNight
57%
539
26%
1620
18%
539
62%
539
39%
890
May16th to endNight
61%
561
26%
1685
20%
561
67%
561
44%
854
June1st to 15thNight
66%
540
26%
1620
23%
540
69%
540
53%
770
June16th to endNight
73%
540
30%
1620
30%
540
76%
540
63%
710
July1st to 15thNight
77%
510
20%
1530
19%
510
78%
510
40%
820
July16th to endNight
79%
564
23%
1593
22%
531
79%
531
43%
860
August1st to 15thNight
77%
527
26%
1575
23%
524
77%
524
42%
824
August16th to endNight
82%
525
33%
1636
31%
525
83%
525
49%
789
September1st to 15thNight
76%
593
34%
1748
31%
593
80%
593
50%
881
September16th to endNight
80%
656
40%
1815
31%
656
84%
656
64%
840
October1st to 15thNight
69%
660
35%
1947
28%
660
74%
660
53%
962
October16th to endNight
71%
704
36%
2112
29%
704
77%
704
53%
1013
November1st to 15thNight
73%
700
33%
2193
30%
700
77%
700
48%
1077
November16th to endNight
68%
756
34%
2376
31%
756
74%
756
51%
1115
December1st to 15thNight
68%
900
23%
2520
19%
900
72%
900
45%
1399
December16th to endNight
57%
795
16%
2523
15%
795
61%
795
25%
1634

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
331342445%7%57%
47185
Night
441342345%7%58%
46972
TransparencyDay
23%410%21%22%15%
46880
Night
24%411%22%22%14%
46778
SeeingDay
6%9%21%30%23%9%
5123
Night
5%216%40%30%4
15552

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
25%26%7%5%5%6%6%8%43%
1611
16th to endDay
5%3145%35%5%7%10%45%
1728
February1st to 15thDay
15%15%5%3447%12%48%
1575
16th to endDay
47%2442346%8%53%
1561
March1st to 15thDay
2414324448%59%
1980
16th to endDay
341333446%7%56%
2112
April1st to 15thDay
3424423347%59%
2061
16th to endDay
3314434347%60%
2289
May1st to 15thDay
43135%245%5%8%54%
2331
16th to endDay
431332345%7%59%
2429
June1st to 15thDay
223214346%67%
2340
16th to endDay
11122223476%
2340
July1st to 15thDay
43135%346%6%7%52%
2340
16th to endDay
42145%46%6%8%10%45%
2467
August1st to 15thDay
43135%45%6%6%8%50%
2290
16th to endDay
3212425%5%6%6%58%
2212
September1st to 15thDay
5%2332345%6%60%
1880
16th to endDay
3112211235%73%
1815
October1st to 15thDay
4313222246%66%
1683
16th to endDay
3312213246%68%
1760
November1st to 15thDay
3312212245%70%
1663
16th to endDay
3322213337%66%
1569
December1st to 15thDay
36%145%35%5%6%7%49%
1440
16th to endDay
46%37%8%46%7%5%9%35%
1709
January1st to 15thNight
35%245%23349%54%
2327
16th to endNight
5%5%245%2445%9%52%
2496
February1st to 15thNight
44245%2345%9%53%
2277
16th to endNight
35%35%5%24346%53%
1908
March1st to 15thNight
5%32332435%8%57%
1980
16th to endNight
332442446%7%56%
2112
April1st to 15thNight
5%5%24324446%55%
1886
16th to endNight
231322346%8%60%
1668
May1st to 15thNight
4424425%5%5%6%54%
1619
16th to endNight
331342445%7%59%
1684
June1st to 15thNight
333223347%65%
1620
16th to endNight
2112212335%73%
1620
July1st to 15thNight
32135%35%6%7%9%51%
1620
16th to endNight
22145%45%5%7%11%48%
1701
August1st to 15thNight
31144345%6%7%56%
1584
16th to endNight
221332446%9%58%
1636
September1st to 15thNight
5%2123135%5%7%62%
1748
16th to endNight
21121232476%
1815
October1st to 15thNight
5%313212346%65%
1947
16th to endNight
4312213346%66%
2112
November1st to 15thNight
241332235%6%64%
2193
16th to endNight
4312212436%66%
2376
December1st to 15thNight
45%13423347%58%
2520
16th to endNight
5%7%36%7%36%46%8%41%
2523

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
36%8%20%28%7%
1612
16th to endDay
30%7%17%30%11%1
1728
February1st to 15thDay
26%9%22%25%13%2
1575
16th to endDay
28%410%32%20%3
1561
March1st to 15thDay
23%310%31%23%7%
1980
16th to endDay
24%413%28%24%5%
2112
April1st to 15thDay
24%27%25%29%10%
2061
16th to endDay
23%37%21%30%14%
2289
May1st to 15thDay
25%38%17%29%15%
2331
16th to endDay
21%49%18%30%16%
2432
June1st to 15thDay
17%25%10%26%37%
2340
16th to endDay
11%135%20%56%
2340
July1st to 15thDay
26%5%8%13%16%29%
2201
16th to endDay
28%6%12%14%17%20%
2312
August1st to 15thDay
27%7%9%16%15%24%
2275
16th to endDay
22%5%7%17%24%22%
2212
September1st to 15thDay
21%5%7%12%23%28%
1880
16th to endDay
14%35%17%33%25%
1815
October1st to 15thDay
19%35%26%33%10%
1683
16th to endDay
17%47%30%33%5%
1760
November1st to 15thDay
17%212%33%29%4
1663
16th to endDay
19%312%37%23%3
1569
December1st to 15thDay
31%7%22%28%9%
1440
16th to endDay
42%9%20%19%6%1
1709
January1st to 15thNight
27%8%18%34%10%
2327
16th to endNight
29%5%17%30%15%2
2496
February1st to 15thNight
28%7%18%26%14%3
2288
16th to endNight
30%310%29%23%2
1908
March1st to 15thNight
25%47%28%26%7%
1980
16th to endNight
25%210%27%27%6%
2112
April1st to 15thNight
27%39%19%26%14%
1886
16th to endNight
20%47%23%31%12%
1668
May1st to 15thNight
27%5%7%14%30%14%
1620
16th to endNight
21%5%8%16%31%15%
1685
June1st to 15thNight
18%25%9%24%38%
1620
16th to endNight
13%245%16%57%
1620
July1st to 15thNight
25%6%9%15%13%28%
1530
16th to endNight
24%5%12%19%17%20%
1593
August1st to 15thNight
23%6%11%17%19%21%
1575
16th to endNight
19%48%19%20%27%
1636
September1st to 15thNight
20%47%14%18%35%
1748
16th to endNight
13%25%15%29%33%
1815
October1st to 15thNight
19%26%21%33%15%
1947
16th to endNight
18%38%18%40%10%
2112
November1st to 15thNight
21%39%27%30%7%
2193
16th to endNight
19%210%30%30%6%
2376
December1st to 15thNight
25%419%34%15%
2520
16th to endNight
40%8%20%22%7%1
2523

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
22%10%35%20%12%
90
16th to endDay
7%315%27%37%9%
96
February1st to 15thDay
11%6%34%32%15%
90
16th to endDay
7%17%22%28%18%4
207
March1st to 15thDay
49%23%35%22%4
270
16th to endDay
7%17%27%33%13%1
288
April1st to 15thDay
5%21%31%20%13%7%
269
16th to endDay
8%25%27%24%11%3
270
May1st to 15thDay
7%15%27%30%15%3
288
16th to endDay
6%10%27%26%20%9%
330
June1st to 15thDay
415%27%23%18%9%
315
16th to endDay
26%24%31%24%11%
315
July1st to 15thDay
5%414%28%33%13%
305
16th to endDay
416%24%38%15%
327
August1st to 15thDay
5%317%34%26%13%
300
16th to endDay
7%115%29%32%13%
268
September1st to 15thDay
45%23%36%25%6%
255
16th to endDay
5%6%17%27%29%13%
255
October1st to 15thDay
2417%27%31%17%
123
16th to endDay
9%415%35%29%6%
96
November1st to 15thDay
212%33%35%16%
90
16th to endDay
6%6%21%42%20%3
90
December1st to 15thDay
6%13%55%21%3
90
16th to endDay
9%8%13%31%29%8%
96
January1st to 15thNight
7%12%46%26%6%
720
16th to endNight
7%14%43%27%5%
768
February1st to 15thNight
6%113%49%23%5%
704
16th to endNight
5%224%47%17%2
632
March1st to 15thNight
5%220%42%25%2
720
16th to endNight
5%426%40%22%1
768
April1st to 15thNight
8%5%28%39%15%2
627
16th to endNight
47%31%34%19%3
540
May1st to 15thNight
5%425%41%20%2
540
16th to endNight
4422%39%24%3
563
June1st to 15thNight
5%321%42%24%2
540
16th to endNight
2117%45%30%2
540
July1st to 15thNight
5%8%34%46%4
510
16th to endNight
3427%56%6%
564
August1st to 15thNight
417%33%50%3
527
16th to endNight
38%34%45%8%
525
September1st to 15thNight
6%10%34%40%7%
593
16th to endNight
2111%29%43%10%
656
October1st to 15thNight
4118%40%29%5%
660
16th to endNight
6%115%34%34%6%
704
November1st to 15thNight
3213%41%33%4
700
16th to endNight
6%217%37%29%6%
756
December1st to 15thNight
7%114%52%21%2
900
16th to endNight
7%215%43%26%4
795
Page generated at 2017-08-13 12:16:15. Version ac04

Copyright 2017 A. Danko


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