Living Desert State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Living Desert State Park clear sky chart from 2005-11-05 to 2017-03-21.

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
62%
15000
34%
45174
24%
14961
72%
14961
49%
22274

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
56%
739
33%
2350
24%
739
68%
739
45%
1179
January16th to endNight
56%
768
39%
2373
26%
768
71%
768
50%
1124
February1st to 15thNight
56%
702
35%
2112
23%
700
69%
700
51%
1008
February16th to endNight
43%
632
39%
1894
18%
632
62%
632
52%
904
March1st to 15thNight
50%
720
35%
2124
20%
720
62%
720
47%
1073
March16th to endNight
51%
629
36%
1903
22%
629
66%
629
53%
903
April1st to 15thNight
44%
494
37%
1648
21%
494
65%
494
46%
755
April16th to endNight
45%
495
38%
1650
24%
495
68%
495
56%
687
May1st to 15thNight
50%
494
31%
1649
24%
494
66%
494
48%
771
May16th to endNight
60%
514
28%
1560
25%
513
69%
513
48%
781
June1st to 15thNight
67%
495
31%
1414
25%
495
74%
495
58%
677
June16th to endNight
73%
495
27%
1320
21%
495
76%
495
56%
680
July1st to 15thNight
78%
465
27%
1313
24%
465
81%
465
47%
699
July16th to endNight
80%
522
25%
1577
28%
489
81%
489
41%
830
August1st to 15thNight
85%
494
29%
1639
35%
491
85%
491
44%
809
August16th to endNight
82%
525
23%
1750
28%
525
83%
525
37%
948
September1st to 15thNight
76%
495
26%
1650
29%
495
77%
495
32%
955
September16th to endNight
77%
492
33%
1808
36%
492
79%
492
42%
852
October1st to 15thNight
68%
555
37%
1875
33%
555
73%
555
48%
862
October16th to endNight
74%
704
41%
2112
28%
704
81%
704
63%
926
November1st to 15thNight
69%
811
40%
2211
23%
811
76%
811
61%
1051
November16th to endNight
63%
900
40%
2340
21%
900
73%
900
55%
1199
December1st to 15thNight
58%
900
38%
2340
21%
900
68%
900
52%
1264
December16th to endNight
53%
960
37%
2562
21%
960
63%
960
50%
1337

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%212313347%62%
45657
Night
5%212213346%64%
45379
Cloud CoverDay
5%212313347%63%
45655
Night
5%212213346%64%
45379
TransparencyDay
20%48%17%25%23%
45363
Night
20%37%16%25%25%
45176
SeeingDay
6%5%18%31%28%8%
4648
Night
6%323%43%22%1
15008

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%423223236%63%
1598
16th to endDay
6%212213346%64%
1847
February1st to 15thDay
321221234470%
1750
16th to endDay
3422212346%65%
1580
March1st to 15thDay
5%323312247%62%
1833
16th to endDay
4312322237%66%
2089
April1st to 15thDay
4212213336%65%
1970
16th to endDay
211111222477%
1980
May1st to 15thDay
6%212323346%62%
1971
16th to endDay
5%22213246%66%
2199
June1st to 15thDay
1112212446%69%
2213
16th to endDay
311232346%10%59%
2310
July1st to 15thDay
5%3233245%7%10%51%
2228
16th to endDay
6%21341346%9%53%
2162
August1st to 15thDay
4134345%7%10%54%
1980
16th to endDay
5%3135%345%8%10%47%
2100
September1st to 15thDay
12%41431447%8%46%
1980
16th to endDay
7%23322346%61%
1821
October1st to 15thDay
7%212212245%67%
1752
16th to endDay
311121222476%
1760
November1st to 15thDay
5%22212226%72%
1635
16th to endDay
5%212112345%70%
1620
December1st to 15thDay
5%413214345%62%
1620
16th to endDay
6%5%12213435%63%
1659
January1st to 15thNight
6%413223345%63%
2350
16th to endNight
5%212212335%68%
2373
February1st to 15thNight
3313212335%67%
2102
16th to endNight
421231325%5%67%
1894
March1st to 15thNight
6%31221345%5%63%
2124
16th to endNight
4212222235%69%
1903
April1st to 15thNight
412231235%5%66%
1648
16th to endNight
31111222477%
1650
May1st to 15thNight
5%2131335%467%
1649
16th to endNight
7%211213337%64%
1559
June1st to 15thNight
12315%46%9%64%
1414
16th to endNight
21231446%10%60%
1320
July1st to 15thNight
42123145%8%11%52%
1400
16th to endNight
4213425%5%6%12%50%
1695
August1st to 15thNight
31133246%7%12%52%
1650
16th to endNight
42134348%8%10%48%
1750
September1st to 15thNight
8%313325%6%7%9%46%
1650
16th to endNight
6%312312448%60%
1808
October1st to 15thNight
7%31212325%68%
1875
16th to endNight
3211122477%
2112
November1st to 15thNight
411121323472%
2211
16th to endNight
432212235%69%
2340
December1st to 15thNight
7%312213346%63%
2340
16th to endNight
5%412223336%64%
2562

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%423223245%63%
1598
16th to endDay
6%212213346%64%
1847
February1st to 15thDay
3212312245%69%
1750
16th to endDay
3422213246%66%
1580
March1st to 15thDay
5%313222247%62%
1833
16th to endDay
4212213236%67%
2087
April1st to 15thDay
4212313346%65%
1970
16th to endDay
21121223477%
1980
May1st to 15thDay
6%312323346%62%
1971
16th to endDay
5%212213346%66%
2199
June1st to 15thDay
111221335%6%70%
2213
16th to endDay
321232346%10%59%
2310
July1st to 15thDay
5%323315%5%6%10%51%
2228
16th to endDay
6%31342446%9%53%
2162
August1st to 15thDay
3135%245%7%9%54%
1980
16th to endDay
5%3135%246%8%11%46%
2100
September1st to 15thDay
12%41432446%7%46%
1980
16th to endDay
7%23323347%61%
1821
October1st to 15thDay
7%212212245%67%
1752
16th to endDay
3112222476%
1760
November1st to 15thDay
4112112236%72%
1635
16th to endDay
5%31112245%69%
1620
December1st to 15thDay
5%413314345%62%
1620
16th to endDay
6%5%1221334463%
1659
January1st to 15thNight
6%412223345%62%
2350
16th to endNight
5%212212335%68%
2373
February1st to 15thNight
331221333468%
2102
16th to endNight
431221324467%
1894
March1st to 15thNight
6%312213345%63%
2124
16th to endNight
4212322245%68%
1903
April1st to 15thNight
4212323345%67%
1648
16th to endNight
311121222376%
1650
May1st to 15thNight
5%2121334467%
1649
16th to endNight
6%211113437%64%
1559
June1st to 15thNight
1232446%8%64%
1414
16th to endNight
21221446%10%61%
1320
July1st to 15thNight
42123246%8%11%52%
1400
16th to endNight
4213425%5%7%11%51%
1695
August1st to 15thNight
32133246%8%12%52%
1650
16th to endNight
42134347%8%11%48%
1750
September1st to 15thNight
9%323425%6%7%8%46%
1650
16th to endNight
7%31231345%7%60%
1808
October1st to 15thNight
7%31212235%68%
1875
16th to endNight
32111123377%
2112
November1st to 15thNight
411221223472%
2211
16th to endNight
4312212235%69%
2340
December1st to 15thNight
6%31221335%5%63%
2340
16th to endNight
5%412223346%64%
2562

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%25%18%29%20%
1599
16th to endDay
21%3414%32%23%
1847
February1st to 15thDay
16%27%15%25%32%
1751
16th to endDay
20%2313%27%32%
1580
March1st to 15thDay
20%2412%31%28%
1833
16th to endDay
19%2413%26%33%
2089
April1st to 15thDay
20%249%27%35%
1970
16th to endDay
12%249%25%46%
1980
May1st to 15thDay
21%45%11%20%36%
1971
16th to endDay
18%36%13%21%35%
2202
June1st to 15thDay
14%46%16%20%36%
2213
16th to endDay
18%411%20%21%22%
2310
July1st to 15thDay
24%7%14%23%19%10%
2086
16th to endDay
23%7%14%27%22%4
2018
August1st to 15thDay
20%8%15%26%23%5%
1967
16th to endDay
27%8%15%25%18%4
2100
September1st to 15thDay
33%6%13%21%16%8%
1980
16th to endDay
23%47%17%29%16%
1821
October1st to 15thDay
20%38%17%27%23%
1752
16th to endDay
14%1414%34%30%
1760
November1st to 15thDay
16%2417%33%26%
1635
16th to endDay
16%25%13%30%30%
1620
December1st to 15thDay
23%36%22%30%14%
1620
16th to endDay
23%37%21%30%13%
1659
January1st to 15thNight
23%35%16%29%22%
2350
16th to endNight
19%2413%32%26%
2373
February1st to 15thNight
19%26%13%21%35%
2112
16th to endNight
19%2310%27%36%
1894
March1st to 15thNight
21%3413%27%29%
2124
16th to endNight
18%2415%23%35%
1903
April1st to 15thNight
18%3410%24%38%
1648
16th to endNight
14%2310%24%45%
1650
May1st to 15thNight
19%36%12%19%38%
1650
16th to endNight
20%5%8%14%20%31%
1561
June1st to 15thNight
14%49%17%23%30%
1414
16th to endNight
16%6%14%22%19%21%
1320
July1st to 15thNight
22%5%16%27%20%7%
1313
16th to endNight
22%8%15%26%23%3
1577
August1st to 15thNight
21%6%15%25%25%7%
1639
16th to endNight
26%7%14%26%16%7%
1750
September1st to 15thNight
30%9%14%20%16%9%
1650
16th to endNight
22%49%19%28%15%
1808
October1st to 15thNight
20%27%16%25%26%
1875
16th to endNight
13%2414%29%37%
2112
November1st to 15thNight
15%2414%34%29%
2211
16th to endNight
18%2312%28%35%
2340
December1st to 15thNight
22%2419%27%23%
2340
16th to endNight
21%25%19%33%17%
2562

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
18%326%32%16%2
90
16th to endDay
46%34%34%15%5%
96
February1st to 15thDay
5%7%13%30%34%8%
90
16th to endDay
8%11%25%23%25%4
81
March1st to 15thDay
6%434%26%20%7%
123
16th to endDay
316%31%32%13%2
245
April1st to 15thDay
6%17%42%23%9%
209
16th to endDay
419%41%26%7%
210
May1st to 15thDay
7%12%40%28%10%
228
16th to endDay
5%324%45%20%1
414
June1st to 15thDay
2217%43%29%5%
420
16th to endDay
3212%35%39%7%
420
July1st to 15thDay
5%5%34%44%9%
325
16th to endDay
2329%40%23%
271
August1st to 15thDay
4223%43%25%
255
16th to endDay
8%15%26%40%16%
268
September1st to 15thDay
11%7%25%42%11%
255
16th to endDay
11%6%20%41%19%
96
October1st to 15thDay
15%28%20%37%15%
90
16th to endDay
5%212%28%33%18%
96
November1st to 15thDay
15%215%26%21%18%
90
16th to endDay
10%14%20%31%18%5%
90
December1st to 15thDay
10%323%34%21%7%
90
16th to endDay
16%13%16%38%14%
96
January1st to 15thNight
9%226%44%15%1
743
16th to endNight
6%428%47%12%
768
February1st to 15thNight
6%5%27%44%15%
704
16th to endNight
6%6%41%40%4
632
March1st to 15thNight
6%5%32%43%11%
720
16th to endNight
45%35%46%8%
629
April1st to 15thNight
410%38%42%3
494
16th to endNight
26%43%42%5%
495
May1st to 15thNight
6%436%45%7%
495
16th to endNight
6%127%51%12%
515
June1st to 15thNight
1126%55%15%
495
16th to endNight
317%51%25%
495
July1st to 15thNight
48%48%35%1
465
16th to endNight
4440%46%3
522
August1st to 15thNight
3225%64%3
494
16th to endNight
3333%55%3
525
September1st to 15thNight
9%5%37%43%2
495
16th to endNight
8%6%44%38%1
492
October1st to 15thNight
8%217%46%24%
555
16th to endNight
4215%41%33%2
704
November1st to 15thNight
5%219%43%27%
811
16th to endNight
6%5%20%40%25%1
900
December1st to 15thNight
9%325%44%17%
900
16th to endNight
7%6%28%43%13%
960
Page generated at 2017-03-22 00:42:26. Version ac04

Copyright 2017 A. Danko


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