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 2017-12-01.

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
63%
15838
34%
47766
25%
15799
72%
15799
49%
23476

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%
660
39%
2004
23%
660
67%
660
53%
939
April1st to 15thNight
43%
539
35%
1798
20%
539
64%
539
45%
833
April16th to endNight
45%
540
40%
1800
24%
540
70%
540
56%
746
May1st to 15thNight
50%
539
30%
1799
24%
539
65%
539
50%
827
May16th to endNight
60%
562
31%
1706
26%
561
70%
561
49%
844
June1st to 15thNight
68%
540
29%
1542
23%
540
75%
540
57%
745
June16th to endNight
73%
540
29%
1440
23%
540
76%
540
56%
737
July1st to 15thNight
79%
510
25%
1440
22%
510
81%
510
48%
760
July16th to endNight
80%
564
26%
1712
29%
531
81%
531
41%
895
August1st to 15thNight
85%
539
27%
1789
33%
536
85%
536
43%
889
August16th to endNight
83%
573
24%
1910
30%
573
84%
573
38%
1021
September1st to 15thNight
77%
540
25%
1800
28%
540
79%
540
34%
1012
September16th to endNight
74%
537
34%
1973
36%
537
77%
537
41%
947
October1st to 15thNight
67%
606
36%
2046
31%
606
73%
606
48%
941
October16th to endNight
75%
768
43%
2304
29%
768
82%
768
63%
1002
November1st to 15thNight
68%
880
38%
2400
22%
880
75%
880
59%
1158
November16th to endNight
64%
975
42%
2535
23%
975
74%
975
57%
1282
December1st to 15thNight
59%
905
37%
2353
21%
905
68%
905
52%
1273
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%63%
48629
Night
5%212213346%64%
47971
Cloud CoverDay
5%212313347%63%
48627
Night
5%212213346%64%
47971
TransparencyDay
20%48%17%26%23%
48335
Night
19%37%17%25%25%
47768
SeeingDay
6%5%17%30%28%10%
5634
Night
6%322%43%23%1
15846

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
3312312236%67%
2218
April1st to 15thDay
5%212213336%65%
2150
16th to endDay
211111222477%
2160
May1st to 15thDay
5%212323346%64%
2151
16th to endDay
5%22213246%67%
2405
June1st to 15thDay
1112212447%69%
2414
16th to endDay
311232245%10%60%
2520
July1st to 15thDay
5%3233245%7%10%52%
2430
16th to endDay
6%2134135%6%9%54%
2335
August1st to 15thDay
41134345%7%10%53%
2160
16th to endDay
5%3134345%8%10%48%
2292
September1st to 15thDay
11%31431446%8%48%
2160
16th to endDay
9%23322346%60%
1986
October1st to 15thDay
7%212212245%67%
1911
16th to endDay
31121222477%
1920
November1st to 15thDay
5%212212236%71%
1774
16th to endDay
5%211112345%70%
1755
December1st to 15thDay
5%413214345%62%
1621
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%70%
2004
April1st to 15thNight
4212312345%66%
1798
16th to endNight
211111222477%
1800
May1st to 15thNight
5%2131334468%
1799
16th to endNight
6%211213337%66%
1705
June1st to 15thNight
12315%46%9%63%
1542
16th to endNight
21231446%11%61%
1440
July1st to 15thNight
41123146%8%11%53%
1527
16th to endNight
4213425%5%6%11%52%
1830
August1st to 15thNight
3212325%6%8%12%52%
1800
16th to endNight
32124348%8%11%49%
1910
September1st to 15thNight
8%313325%5%7%9%49%
1800
16th to endNight
9%31221245%7%58%
1973
October1st to 15thNight
7%21212335%68%
2046
16th to endNight
3211222377%
2304
November1st to 15thNight
5%112213235%71%
2400
16th to endNight
432212235%70%
2535
December1st to 15thNight
7%312213346%63%
2353
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
3213213236%67%
2216
April1st to 15thDay
5%222313346%65%
2150
16th to endDay
21121123477%
2160
May1st to 15thDay
5%212223346%64%
2151
16th to endDay
5%212213336%66%
2405
June1st to 15thDay
111221335%6%70%
2414
16th to endDay
311232346%10%60%
2520
July1st to 15thDay
5%223325%5%6%10%52%
2430
16th to endDay
6%2133235%6%9%54%
2335
August1st to 15thDay
41135%245%8%9%53%
2160
16th to endDay
5%3135%246%7%11%47%
2292
September1st to 15thDay
11%31332446%8%49%
2160
16th to endDay
9%23323336%60%
1986
October1st to 15thDay
7%312212245%67%
1911
16th to endDay
31221122477%
1920
November1st to 15thDay
4212112236%70%
1774
16th to endDay
5%31112345%70%
1755
December1st to 15thDay
5%413314345%62%
1621
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
4212222245%69%
2004
April1st to 15thNight
4212323345%66%
1798
16th to endNight
211121222477%
1800
May1st to 15thNight
5%2121334468%
1799
16th to endNight
6%211113337%66%
1705
June1st to 15thNight
1132446%9%63%
1542
16th to endNight
21221446%10%62%
1440
July1st to 15thNight
41123246%8%11%53%
1527
16th to endNight
4213425%5%7%11%52%
1830
August1st to 15thNight
3213325%6%8%12%51%
1800
16th to endNight
32134347%7%11%49%
1910
September1st to 15thNight
8%313325%5%7%8%49%
1800
16th to endNight
9%31221345%8%58%
1973
October1st to 15thNight
7%31212235%68%
2046
16th to endNight
32111123377%
2304
November1st to 15thNight
411221223471%
2400
16th to endNight
331221223470%
2535
December1st to 15thNight
6%31221335%5%63%
2353
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
18%2413%26%34%
2218
April1st to 15thDay
20%249%27%35%
2150
16th to endDay
12%239%26%45%
2160
May1st to 15thDay
20%45%11%22%37%
2151
16th to endDay
18%37%13%22%34%
2408
June1st to 15thDay
14%47%16%20%35%
2414
16th to endDay
18%410%20%22%23%
2520
July1st to 15thDay
24%6%14%23%21%10%
2288
16th to endDay
22%7%15%27%23%4
2191
August1st to 15thDay
21%8%16%26%22%4
2147
16th to endDay
26%8%15%24%18%5%
2292
September1st to 15thDay
31%6%13%20%19%9%
2160
16th to endDay
25%47%16%29%16%
1986
October1st to 15thDay
20%37%18%27%23%
1911
16th to endDay
14%1415%34%29%
1920
November1st to 15thDay
17%2418%32%24%
1774
16th to endDay
15%2415%31%29%
1755
December1st to 15thDay
23%36%22%29%14%
1621
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%36%
2004
April1st to 15thNight
19%35%11%23%36%
1798
16th to endNight
13%2311%25%43%
1800
May1st to 15thNight
18%36%12%20%38%
1800
16th to endNight
19%5%8%14%20%32%
1707
June1st to 15thNight
15%49%17%22%29%
1542
16th to endNight
16%5%14%21%19%22%
1440
July1st to 15thNight
21%6%15%27%22%8%
1440
16th to endNight
22%8%15%26%23%4
1712
August1st to 15thNight
21%6%15%25%24%6%
1789
16th to endNight
24%8%15%26%16%8%
1910
September1st to 15thNight
28%8%13%20%19%10%
1800
16th to endNight
23%49%19%27%15%
1973
October1st to 15thNight
20%37%16%25%26%
2046
16th to endNight
12%2414%29%36%
2304
November1st to 15thNight
16%2414%33%27%
2400
16th to endNight
17%2213%29%33%
2535
December1st to 15thNight
22%2419%27%23%
2353
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%31%14%2
288
April1st to 15thDay
7%15%38%26%11%
269
16th to endDay
418%37%27%9%2
270
May1st to 15thDay
6%12%38%28%12%1
288
16th to endDay
5%426%43%19%1
492
June1st to 15thDay
2115%39%32%7%
495
16th to endDay
3210%34%38%9%
495
July1st to 15thDay
5%5%33%43%12%
392
16th to endDay
2427%39%25%
327
August1st to 15thDay
5%122%43%27%
315
16th to endDay
8%15%23%38%23%
332
September1st to 15thDay
9%6%25%43%14%
315
16th to endDay
18%18%19%37%14%
141
October1st to 15thDay
11%28%26%34%15%
135
16th to endDay
4213%25%32%21%
144
November1st to 15thDay
12%419%29%20%13%
135
16th to endDay
6%12%20%30%22%7%
135
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%45%8%
660
April1st to 15thNight
5%9%38%42%3
539
16th to endNight
27%42%41%5%
540
May1st to 15thNight
5%337%44%8%
540
16th to endNight
6%227%51%11%
563
June1st to 15thNight
1124%55%17%
540
16th to endNight
317%52%26%
540
July1st to 15thNight
49%47%36%1
510
16th to endNight
4439%47%3
564
August1st to 15thNight
3226%64%3
539
16th to endNight
3231%57%3
573
September1st to 15thNight
8%437%45%2
540
16th to endNight
10%17%43%36%1
537
October1st to 15thNight
8%217%45%24%
606
16th to endNight
4215%40%34%2
768
November1st to 15thNight
6%219%44%26%1
880
16th to endNight
6%5%20%41%25%1
975
December1st to 15thNight
9%325%43%17%
905
16th to endNight
7%6%28%43%13%
960
Page generated at 2017-12-02 07:14:21. Version ac04

Copyright 2017 A. Danko


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