Lava Springs Star Party
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lava Springs Star Party clear sky chart from 2005-11-06 to 2024-01-15.

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
55%
23931
19%
74520
17%
23886
58%
23886
28%
46475

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 10thNight
41%
756
10%
2646
10%
756
44%
756
14%
1927
January11th to 20thNight
44%
736
14%
2430
14%
736
47%
736
16%
1760
January21st to endNight
41%
792
11%
2574
10%
792
43%
792
15%
1914
February1st to 10thNight
37%
720
10%
2340
7%
720
42%
720
15%
1719
February11th to 20thNight
44%
703
13%
2237
12%
700
47%
700
21%
1507
February21st to endNight
37%
592
16%
1776
13%
592
42%
592
18%
1278
March1st to 10thNight
47%
720
16%
2062
14%
720
51%
720
21%
1479
March11th to 20thNight
50%
720
20%
1980
15%
720
54%
720
29%
1291
March21st to endNight
45%
792
12%
2178
9%
792
48%
792
22%
1564
April1st to 10thNight
46%
689
16%
1936
10%
689
50%
689
25%
1298
April11th to 20thNight
41%
533
20%
1601
13%
533
46%
533
25%
1048
April21st to endNight
52%
540
23%
1620
16%
540
56%
540
32%
971
May1st to 10thNight
55%
540
19%
1620
16%
540
56%
540
32%
984
May11th to 20thNight
61%
531
19%
1595
16%
531
63%
531
32%
957
May21st to endNight
55%
583
13%
1648
12%
582
57%
582
27%
1084
June1st to 10thNight
65%
500
19%
1400
17%
500
69%
500
39%
805
June11th to 20thNight
62%
360
23%
1260
25%
360
68%
360
38%
642
June21st to endNight
78%
360
32%
1260
39%
360
83%
360
53%
526
July1st to 10thNight
80%
350
25%
1324
35%
350
83%
350
46%
567
July11th to 20thNight
80%
424
29%
1468
34%
424
83%
424
55%
620
July21st to endNight
81%
591
28%
1674
28%
558
82%
558
54%
819
August1st to 10thNight
77%
537
28%
1602
25%
534
78%
534
46%
827
August11th to 20thNight
80%
534
36%
1602
30%
534
81%
534
55%
762
August21st to endNight
77%
594
38%
1782
33%
594
79%
594
55%
851
September1st to 10thNight
74%
647
32%
1892
27%
647
78%
647
54%
917
September11th to 20thNight
75%
720
33%
1980
28%
720
78%
720
54%
1011
September21st to endNight
70%
720
33%
1980
26%
720
73%
720
48%
1074
October1st to 10thNight
63%
720
24%
2070
18%
720
66%
720
38%
1198
October11th to 20thNight
64%
720
28%
2160
24%
720
67%
720
39%
1202
October21st to endNight
61%
792
27%
2443
23%
792
66%
792
35%
1398
November1st to 10thNight
56%
740
21%
2405
20%
740
59%
740
25%
1505
November11th to 20thNight
49%
805
19%
2515
16%
805
53%
805
26%
1607
November21st to endNight
50%
950
16%
2660
13%
950
53%
950
27%
1781
December1st to 10thNight
41%
950
11%
2660
8%
950
43%
950
19%
1937
December11th to 20thNight
37%
950
11%
3162
8%
949
38%
949
13%
2405
December21st to endNight
32%
1020
6%
4978
6%
1016
35%
1016
9%
3240

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
8%9%46%5%3445%7%46%
74845
Night
8%9%46%5%3445%7%45%
74929
TransparencyDay
38%5%11%20%18%8%
74558
Night
39%6%13%20%16%7%
74736
SeeingDay
11%12%25%29%17%5%
14111
Night
12%5%19%41%21%2
23952

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 10thDay
9%21%7%8%6%35%347%30%
1519
11th to 20thDay
9%15%7%9%6%34445%34%
1611
21st to endDay
10%18%8%10%7%3445%5%27%
1782
February1st to 10thDay
10%17%7%10%5%345%5%5%28%
1620
11th to 20thDay
9%18%7%10%6%34445%30%
1607
21st to endDay
8%18%9%13%7%345%45%25%
1480
March1st to 10thDay
8%17%6%9%7%3435%6%32%
1898
11th to 20thDay
9%12%5%6%6%35%5%7%9%33%
1980
21st to endDay
11%18%6%8%6%45%446%26%
2178
April1st to 10thDay
13%13%5%7%6%35%5%46%32%
2018
11th to 20thDay
10%12%5%6%6%35%5%5%7%36%
2307
21st to endDay
9%12%37%5%4446%7%39%
2340
May1st to 10thDay
9%9%36%5%45%6%6%7%41%
2340
11th to 20thDay
8%7%26%6%45%6%7%9%40%
2301
21st to endDay
12%8%37%7%45%5%6%8%35%
2624
June1st to 10thDay
7%5%25%5%25%5%6%8%49%
2556
11th to 20thDay
8%5%2442445%8%53%
2700
21st to endDay
3213323446%70%
2700
July1st to 10thDay
322332345%8%67%
2591
11th to 20thDay
3214324446%66%
2440
21st to endDay
4214425%46%7%61%
2545
August1st to 10thDay
6%41443445%6%59%
2328
11th to 20thDay
411332335%7%68%
2299
21st to endDay
5%31342445%7%63%
2574
September1st to 10thDay
5%313423445%66%
2064
11th to 20thDay
6%32332345%7%63%
1980
21st to endDay
8%41332334464%
1980
October1st to 10thDay
12%6%244245%5%7%48%
1890
11th to 20thDay
7%9%25%435%446%51%
1800
21st to endDay
7%8%36%43345%7%50%
1910
November1st to 10thDay
12%11%5%7%6%24446%39%
1674
11th to 20thDay
11%13%45%4245%5%6%41%
1644
21st to endDay
7%13%5%8%5%34446%42%
1520
December1st to 10thDay
10%15%8%10%7%24445%33%
1520
11th to 20thDay
10%15%5%11%8%37%46%8%23%
1926
21st to endDay
7%13%6%10%6%46%6%5%7%30%
2599
January1st to 10thNight
10%16%7%9%6%34347%32%
2646
11th to 20thNight
10%16%6%9%6%34447%31%
2430
21st to endNight
8%17%6%9%7%34447%29%
2574
February1st to 10thNight
8%15%5%11%7%35%46%6%29%
2340
11th to 20thNight
8%15%6%7%5%3445%8%37%
2236
21st to endNight
7%15%7%12%6%35%45%6%30%
1776
March1st to 10thNight
8%14%5%7%6%45%6%6%7%32%
2062
11th to 20thNight
7%9%46%6%35%46%8%41%
1980
21st to endNight
9%13%46%6%45%6%6%6%34%
2178
April1st to 10thNight
10%11%36%5%35%5%6%6%41%
1936
11th to 20thNight
9%11%46%6%35%446%41%
1601
21st to endNight
8%7%26%5%245%6%6%50%
1620
May1st to 10thNight
8%7%26%6%345%5%8%47%
1620
11th to 20thNight
9%5%245%35%6%6%9%45%
1594
21st to endNight
12%6%26%5%46%46%8%41%
1648
June1st to 10thNight
5%325%4345%7%10%51%
1400
11th to 20thNight
8%42442446%7%56%
1260
21st to endNight
4213222437%69%
1260
July1st to 10thNight
22134345%7%7%62%
1364
11th to 20thNight
231331336%7%67%
1516
21st to endNight
22145%2445%7%64%
1773
August1st to 10thNight
44234346%6%9%56%
1611
11th to 20thNight
431332445%6%66%
1602
21st to endNight
3214413347%66%
1782
September1st to 10thNight
3323332435%69%
1892
11th to 20thNight
6%213323446%65%
1980
21st to endNight
8%313323345%64%
1980
October1st to 10thNight
9%6%245%24446%55%
2070
11th to 20thNight
10%6%243235%46%57%
2160
21st to endNight
7%7%25%4335%5%7%52%
2443
November1st to 10thNight
11%8%46%5%346%46%43%
2405
11th to 20thNight
9%10%47%5%345%6%6%41%
2515
21st to endNight
7%10%5%8%6%35%46%6%41%
2660
December1st to 10thNight
10%16%5%8%6%2445%7%33%
2660
11th to 20thNight
11%14%5%10%7%45%5%5%5%29%
3271
21st to endNight
8%13%6%10%6%35%6%7%6%30%
5084

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 10thDay
57%8%17%14%41
1519
11th to 20thDay
53%7%14%18%7%2
1611
21st to endDay
60%6%13%14%5%1
1782
February1st to 10thDay
57%8%12%16%6%1
1620
11th to 20thDay
58%5%13%16%7%2
1616
21st to endDay
61%5%12%14%7%2
1480
March1st to 10thDay
53%6%11%19%8%1
1898
11th to 20thDay
46%7%15%22%10%1
1980
21st to endDay
58%6%13%16%7%1
2178
April1st to 10thDay
52%6%11%16%12%3
2018
11th to 20thDay
47%5%10%22%13%2
2310
21st to endDay
43%6%12%25%14%1
2340
May1st to 10thDay
39%6%12%22%19%2
2340
11th to 20thDay
38%6%11%28%14%3
2304
21st to endDay
45%8%11%25%11%1
2624
June1st to 10thDay
31%6%13%28%19%2
2556
11th to 20thDay
29%5%11%22%24%10%
2700
21st to endDay
16%37%20%37%18%
2700
July1st to 10thDay
15%36%18%34%23%
2522
11th to 20thDay
17%27%15%29%30%
2365
21st to endDay
20%5%7%14%28%26%
2404
August1st to 10thDay
24%5%8%16%25%23%
2313
11th to 20thDay
17%37%16%36%21%
2299
21st to endDay
21%37%16%32%20%
2574
September1st to 10thDay
20%48%15%30%23%
2064
11th to 20thDay
21%5%8%22%28%16%
1980
21st to endDay
24%39%25%32%7%
1980
October1st to 10thDay
36%5%11%22%21%5%
1890
11th to 20thDay
34%5%12%29%16%4
1800
21st to endDay
33%6%17%26%17%
1910
November1st to 10thDay
46%6%14%21%11%2
1674
11th to 20thDay
43%6%19%22%10%1
1644
21st to endDay
44%5%17%21%11%2
1520
December1st to 10thDay
55%7%14%15%6%3
1520
11th to 20thDay
57%9%15%17%3
1924
21st to endDay
51%7%18%16%9%
2599
January1st to 10thNight
54%8%17%15%6%1
2646
11th to 20thNight
53%7%14%19%5%2
2430
21st to endNight
56%7%15%14%6%3
2574
February1st to 10thNight
54%7%15%18%5%
2340
11th to 20thNight
47%6%15%21%10%1
2237
21st to endNight
54%414%19%7%2
1776
March1st to 10thNight
49%7%12%23%8%1
2062
11th to 20thNight
39%7%14%26%13%2
1980
21st to endNight
47%8%17%20%8%1
2178
April1st to 10thNight
42%7%14%18%14%4
1936
11th to 20thNight
43%414%22%14%2
1601
21st to endNight
35%5%14%27%19%
1620
May1st to 10thNight
35%6%11%27%19%2
1620
11th to 20thNight
31%9%13%26%16%5%
1595
21st to endNight
39%8%15%25%11%2
1648
June1st to 10thNight
27%8%15%25%24%3
1400
11th to 20thNight
25%6%11%23%23%12%
1260
21st to endNight
16%36%17%32%26%
1260
July1st to 10thNight
20%36%17%30%24%
1324
11th to 20thNight
16%35%13%29%34%
1468
21st to endNight
19%36%14%27%31%
1674
August1st to 10thNight
23%5%8%17%22%25%
1602
11th to 20thNight
18%35%13%34%26%
1602
21st to endNight
18%36%17%33%23%
1782
September1st to 10thNight
19%38%13%27%31%
1892
11th to 20thNight
19%49%22%27%20%
1980
21st to endNight
24%46%23%34%10%
1980
October1st to 10thNight
31%5%11%22%23%7%
2070
11th to 20thNight
29%5%11%31%20%4
2160
21st to endNight
31%6%13%29%19%2
2443
November1st to 10thNight
40%6%14%23%15%2
2405
11th to 20thNight
41%6%17%23%12%1
2515
21st to endNight
43%6%15%24%11%2
2660
December1st to 10thNight
51%7%17%16%7%3
2660
11th to 20thNight
56%7%14%16%7%
3272
21st to endNight
50%7%17%16%10%
5084

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 10thDay
21%16%20%23%15%4
180
11th to 20thDay
14%10%28%27%18%3
231
21st to endDay
15%11%27%30%14%2
264
February1st to 10thDay
21%16%28%28%8%
240
11th to 20thDay
15%17%33%25%7%3
272
21st to endDay
13%23%32%23%8%1
346
March1st to 10thDay
16%20%34%23%6%1
420
11th to 20thDay
13%20%30%27%8%2
420
21st to endDay
20%25%32%17%6%
462
April1st to 10thDay
25%18%24%23%9%1
420
11th to 20thDay
19%26%29%16%7%2
412
21st to endDay
17%20%26%22%11%4
420
May1st to 10thDay
11%18%30%29%9%3
423
11th to 20thDay
15%13%28%27%13%4
448
21st to endDay
13%9%24%27%20%8%
579
June1st to 10thDay
8%10%21%30%26%6%
630
11th to 20thDay
10%13%25%33%16%3
630
21st to endDay
36%20%37%27%8%
630
July1st to 10thDay
3320%41%27%5%
517
11th to 20thDay
2430%38%22%3
444
21st to endDay
2218%40%28%9%
487
August1st to 10thDay
6%5%26%33%24%7%
447
11th to 20thDay
4423%30%27%11%
437
21st to endDay
5%6%22%30%26%11%
495
September1st to 10thDay
5%9%22%28%26%11%
450
11th to 20thDay
6%10%27%25%22%10%
450
21st to endDay
8%11%23%28%20%9%
450
October1st to 10thDay
14%11%20%23%19%13%
360
11th to 20thDay
10%14%19%22%24%11%
270
21st to endDay
12%14%22%34%15%1
297
November1st to 10thDay
15%17%21%29%11%7%
270
11th to 20thDay
13%11%26%31%16%3
270
21st to endDay
12%14%25%31%16%2
270
December1st to 10thDay
16%12%22%34%11%6%
270
11th to 20thDay
15%14%31%28%11%
270
21st to endDay
20%16%27%25%9%3
230
January1st to 10thNight
17%6%19%38%18%2
760
11th to 20thNight
18%5%20%36%18%3
736
21st to endNight
18%6%22%36%17%2
792
February1st to 10thNight
15%7%26%38%13%1
720
11th to 20thNight
13%7%24%41%14%1
704
21st to endNight
12%9%27%37%14%1
592
March1st to 10thNight
13%7%23%44%12%2
720
11th to 20thNight
10%6%23%43%17%
720
21st to endNight
15%8%23%41%13%1
792
April1st to 10thNight
15%9%22%38%15%1
689
11th to 20thNight
14%9%29%36%11%1
533
21st to endNight
11%8%21%36%22%2
540
May1st to 10thNight
11%5%23%41%19%2
540
11th to 20thNight
10%5%15%37%30%3
531
21st to endNight
13%5%17%36%24%5%
584
June1st to 10thNight
7%5%16%41%29%2
500
11th to 20thNight
9%221%44%22%1
360
21st to endNight
6%110%48%31%5%
360
July1st to 10thNight
1110%47%36%4
350
11th to 20thNight
319%58%27%1
424
21st to endNight
317%47%40%4
591
August1st to 10thNight
5%28%50%34%2
537
11th to 20thNight
2110%44%39%3
534
21st to endNight
4212%47%31%5%
594
September1st to 10thNight
5%213%43%33%4
647
11th to 20thNight
7%211%43%30%8%
720
21st to endNight
10%313%38%30%7%
720
October1st to 10thNight
11%317%37%29%3
720
11th to 20thNight
13%316%37%29%3
720
21st to endNight
11%318%43%22%3
792
November1st to 10thNight
12%6%18%43%18%3
740
11th to 20thNight
12%7%23%42%15%2
805
21st to endNight
11%7%22%40%17%3
950
December1st to 10thNight
17%8%22%41%12%
950
11th to 20thNight
18%7%25%38%11%1
950
21st to endNight
19%9%26%34%11%1
1035
Page generated at 2024-01-11 20:33:46. Version ac07

Copyright 2024 Attilla Danko


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