Lava Beds National Monument
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lava Beds National Monument clear sky chart from 2005-11-05 to 2017-09-24.

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
56%
14976
21%
46948
18%
14948
60%
14948
30%
28290

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
50%
716
14%
2506
13%
716
54%
716
20%
1656
January16th to endNight
50%
768
20%
2532
20%
768
52%
768
21%
1668
February1st to 15thNight
46%
696
12%
2288
12%
696
49%
696
19%
1577
February16th to endNight
45%
632
16%
1928
13%
632
50%
632
20%
1337
March1st to 15thNight
41%
720
11%
2064
9%
720
44%
720
18%
1516
March16th to endNight
38%
768
12%
2058
8%
768
41%
768
19%
1513
April1st to 15thNight
39%
719
14%
1799
5%
719
43%
719
22%
1322
April16th to endNight
47%
720
18%
1800
9%
720
51%
720
36%
1127
May1st to 15thNight
52%
425
20%
1505
15%
425
59%
425
31%
820
May16th to endNight
48%
374
16%
1496
15%
374
56%
374
25%
839
June1st to 15thNight
55%
360
17%
1440
19%
360
63%
360
28%
774
June16th to endNight
68%
360
28%
1440
38%
360
76%
360
48%
583
July1st to 15thNight
82%
340
28%
1360
40%
340
86%
340
56%
506
July16th to endNight
87%
415
37%
1452
42%
390
91%
390
63%
546
August1st to 15thNight
89%
538
34%
1611
28%
535
91%
535
63%
712
August16th to endNight
80%
741
42%
1887
26%
741
83%
741
76%
857
September1st to 15thNight
80%
720
40%
1800
25%
720
84%
720
74%
841
September16th to endNight
70%
692
35%
1884
29%
692
74%
692
52%
963
October1st to 15thNight
61%
660
26%
1980
22%
660
69%
660
43%
1052
October16th to endNight
61%
704
23%
2121
24%
704
64%
704
34%
1246
November1st to 15thNight
52%
700
17%
2275
16%
700
55%
700
21%
1535
November16th to endNight
47%
720
13%
2514
12%
720
50%
720
19%
1665
December1st to 15thNight
47%
720
15%
2520
14%
720
51%
720
19%
1695
December16th to endNight
37%
768
16%
2688
15%
768
41%
768
15%
1940

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
44245%3445%7%52%
47993
Night
35%244345%5%7%52%
47124
TransparencyDay
32%7%10%19%19%11%
47668
Night
32%9%11%20%17%8%
46949
SeeingDay
8%17%24%25%17%5%
5763
Night
6%12%21%31%24%3
14990

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
35%25%7%5%8%7%8%12%34%
1432
16th to endDay
5%7%36%6%36%5%6%7%39%
1689
February1st to 15thDay
36%36%6%46%5%7%10%38%
1576
16th to endDay
29%47%7%46%47%8%37%
1544
March1st to 15thDay
36%38%8%46%7%7%9%33%
1894
16th to endDay
48%47%7%37%6%6%9%34%
2165
April1st to 15thDay
5%7%5%7%8%46%5%6%8%33%
2149
16th to endDay
6%7%36%5%34348%46%
2160
May1st to 15thDay
35%2443445%8%53%
2445
16th to endDay
8%6%35%6%35%5%5%7%43%
2615
June1st to 15thDay
7%5%245%3445%6%50%
2520
16th to endDay
322212346%69%
2520
July1st to 15thDay
212212346%71%
2520
16th to endDay
11221233376%
2615
August1st to 15thDay
11232345%6%67%
2340
16th to endDay
11111223479%
2315
September1st to 15thDay
11121223479%
2160
16th to endDay
321332335%7%65%
1931
October1st to 15thDay
5%5%14334446%56%
1650
16th to endDay
5%5%2444445%7%50%
1749
November1st to 15thDay
7%7%36%6%35%6%5%8%41%
1584
16th to endDay
5%5%38%7%446%6%8%39%
1444
December1st to 15thDay
46%37%7%46%6%6%9%36%
1440
16th to endDay
46%48%8%47%7%7%10%31%
1536
January1st to 15thNight
35%345%46%6%7%9%42%
2506
16th to endNight
46%35%5%35%5%5%9%43%
2532
February1st to 15thNight
35%26%7%46%7%6%9%39%
2276
16th to endNight
36%45%6%46%6%7%9%39%
1928
March1st to 15thNight
47%36%7%47%7%6%10%34%
2064
16th to endNight
37%36%6%46%5%9%9%37%
2058
April1st to 15thNight
5%8%47%6%25%6%6%9%38%
1799
16th to endNight
5%6%25%324347%52%
1800
May1st to 15thNight
441432446%7%55%
1505
16th to endNight
6%6%24435%446%52%
1496
June1st to 15thNight
5%425%42345%6%54%
1440
16th to endNight
31311233472%
1440
July1st to 15thNight
11221234474%
1440
16th to endNight
1111123479%
1551
August1st to 15thNight
1211334474%
1620
16th to endNight
1111123481%
1887
September1st to 15thNight
111123480%
1800
16th to endNight
121331235%6%68%
1884
October1st to 15thNight
3413423446%62%
1980
16th to endNight
45%135%24448%54%
2121
November1st to 15thNight
6%6%36%5%35%5%7%8%40%
2275
16th to endNight
35%36%6%35%6%6%9%41%
2514
December1st to 15thNight
6%6%25%6%35%5%6%9%40%
2520
16th to endNight
47%37%7%46%6%7%9%35%
2688

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
41%13%16%17%9%1
1432
16th to endDay
43%9%10%18%9%7%
1689
February1st to 15thDay
41%13%12%19%11%1
1576
16th to endDay
46%10%16%18%6%1
1544
March1st to 15thDay
48%12%11%15%11%1
1894
16th to endDay
49%11%16%11%8%2
2165
April1st to 15thDay
50%8%12%18%10%
2149
16th to endDay
37%6%14%26%13%2
2160
May1st to 15thDay
29%6%12%26%19%5%
2445
16th to endDay
42%6%10%23%13%3
2619
June1st to 15thDay
35%5%10%19%21%7%
2520
16th to endDay
16%37%25%32%13%
2520
July1st to 15thDay
14%35%17%30%29%
2371
16th to endDay
14%2312%26%40%
2451
August1st to 15thDay
16%37%17%27%27%
2324
16th to endDay
10%15%15%37%30%
2315
September1st to 15thDay
10%15%15%33%34%
2160
16th to endDay
19%5%9%22%26%15%
1931
October1st to 15thDay
29%6%10%24%21%8%
1650
16th to endDay
32%10%12%19%19%5%
1749
November1st to 15thDay
43%8%14%18%12%2
1584
16th to endDay
43%11%11%17%11%4
1444
December1st to 15thDay
45%12%11%19%11%
1440
16th to endDay
49%13%11%16%8%1
1536
January1st to 15thNight
38%14%15%17%12%2
2506
16th to endNight
39%12%9%17%12%8%
2532
February1st to 15thNight
41%13%15%15%11%2
2288
16th to endNight
41%12%14%18%10%2
1928
March1st to 15thNight
46%12%13%13%12%1
2064
16th to endNight
43%14%16%15%9%
2058
April1st to 15thNight
43%12%15%19%8%1
1799
16th to endNight
32%5%20%27%10%3
1800
May1st to 15thNight
27%8%12%27%19%4
1506
16th to endNight
34%6%15%28%12%2
1496
June1st to 15thNight
30%7%14%25%17%3
1440
16th to endNight
16%38%30%32%7%
1440
July1st to 15thNight
12%37%21%28%25%
1360
16th to endNight
10%3415%30%35%
1452
August1st to 15thNight
12%37%24%27%25%
1611
16th to endNight
8%16%18%37%27%
1887
September1st to 15thNight
9%25%18%31%33%
1800
16th to endNight
16%6%9%23%23%20%
1884
October1st to 15thNight
23%5%11%25%25%8%
1980
16th to endNight
28%9%14%22%18%7%
2121
November1st to 15thNight
41%10%14%18%10%3
2275
16th to endNight
40%11%13%14%14%4
2514
December1st to 15thNight
42%11%10%21%14%
2520
16th to endNight
46%14%8%16%11%1
2688

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
10%23%30%31%31
60
16th to endDay
11%23%23%17%14%10%
217
February1st to 15thDay
12%22%21%26%15%1
236
16th to endDay
10%25%29%18%14%
232
March1st to 15thDay
12%37%23%12%12%1
270
16th to endDay
12%35%27%16%7%
288
April1st to 15thDay
8%34%21%20%11%2
269
16th to endDay
9%29%27%18%11%3
270
May1st to 15thDay
10%18%33%22%11%2
288
16th to endDay
14%16%18%24%18%7%
330
June1st to 15thDay
12%15%25%24%17%5%
315
16th to endDay
313%26%28%20%8%
315
July1st to 15thDay
4424%38%20%7%
305
16th to endDay
16%21%38%25%7%
327
August1st to 15thDay
1422%35%22%13%
315
16th to endDay
26%24%28%28%10%
332
September1st to 15thDay
2423%30%26%13%
315
16th to endDay
7%10%26%27%26%2
288
October1st to 15thDay
12%16%22%24%18%6%
255
16th to endDay
10%23%24%22%13%5%
261
November1st to 15thDay
10%10%30%25%22%2
90
16th to endDay
6%29%32%18%11%1
61
December1st to 15thDay
21%31%25%16%5%
60
16th to endDay
12%17%20%31%18%
64
January1st to 15thNight
6%13%24%30%21%3
720
16th to endNight
7%15%22%27%22%4
768
February1st to 15thNight
6%17%23%30%20%1
704
16th to endNight
6%18%24%32%15%2
632
March1st to 15thNight
9%23%23%24%16%3
720
16th to endNight
7%21%28%25%15%
768
April1st to 15thNight
7%17%30%27%14%2
719
16th to endNight
9%12%27%29%17%3
720
May1st to 15thNight
6%9%27%32%21%2
426
16th to endNight
10%7%25%32%22%2
375
June1st to 15thNight
7%6%25%39%20%1
360
16th to endNight
4322%44%25%
360
July1st to 15thNight
110%50%34%2
340
16th to endNight
19%48%37%3
415
August1st to 15thNight
16%40%47%5%
538
16th to endNight
2112%40%38%3
741
September1st to 15thNight
1113%31%44%6%
720
16th to endNight
35%18%32%33%6%
692
October1st to 15thNight
5%7%21%33%27%4
660
16th to endNight
8%9%17%30%26%7%
704
November1st to 15thNight
10%10%23%32%17%5%
700
16th to endNight
6%20%21%26%20%4
720
December1st to 15thNight
10%16%22%27%20%3
720
16th to endNight
9%23%25%26%11%2
768
Page generated at 2017-09-25 06:02:28. Version ac04

Copyright 2017 A. Danko


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