Lamoria Springs Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lamoria Springs Observatory clear sky chart from 2005-11-05 to 2017-10-31.

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
35%
15630
15%
47321
9%
15592
41%
15592
20%
32830

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
15%
897
9%
2506
2%
895
22%
895
12%
1992
January16th to endNight
20%
846
11%
2574
4%
846
28%
846
13%
1997
February1st to 15thNight
16%
701
10%
2287
2%
701
25%
701
11%
1732
February16th to endNight
25%
631
14%
1899
5%
631
34%
631
14%
1404
March1st to 15thNight
26%
720
14%
2061
8%
720
31%
720
17%
1503
March16th to endNight
36%
768
17%
2112
11%
768
41%
768
23%
1480
April1st to 15thNight
29%
611
14%
1806
8%
611
35%
611
20%
1255
April16th to endNight
36%
540
19%
1620
9%
540
45%
540
25%
1074
May1st to 15thNight
41%
540
14%
1620
9%
540
46%
540
22%
1103
May16th to endNight
44%
510
16%
1630
12%
510
51%
510
28%
996
June1st to 15thNight
50%
360
15%
1260
14%
360
56%
360
26%
761
June16th to endNight
55%
360
17%
1260
16%
360
62%
360
30%
723
July1st to 15thNight
66%
469
17%
1319
16%
469
68%
469
40%
765
July16th to endNight
65%
564
15%
1508
12%
531
67%
531
36%
912
August1st to 15thNight
64%
539
17%
1609
15%
536
65%
536
32%
970
August16th to endNight
61%
573
24%
1719
18%
573
67%
573
35%
1011
September1st to 15thNight
56%
681
21%
1919
15%
681
60%
681
32%
1186
September16th to endNight
58%
717
23%
1980
18%
717
62%
717
34%
1217
October1st to 15thNight
42%
720
16%
2094
13%
720
47%
720
25%
1396
October16th to endNight
26%
768
14%
2390
9%
768
34%
768
15%
1750
November1st to 15thNight
30%
700
18%
2276
14%
700
38%
700
19%
1517
November16th to endNight
25%
720
12%
2484
7%
720
32%
720
13%
1819
December1st to 15thNight
14%
735
8%
2535
2%
735
21%
735
10%
1934
December16th to endNight
13%
960
8%
2853
1%
960
19%
960
9%
2333

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
14%8%37%6%35%45%7%32%
48418
Night
15%8%46%5%3445%6%35%
47500
Cloud CoverDay
13%8%47%6%35%45%7%32%
48428
Night
14%8%46%5%3445%6%35%
47504
TransparencyDay
49%6%12%19%10%1
48115
Night
48%6%12%21%10%1
47321
SeeingDay
16%7%27%25%15%7%
5994
Night
18%8%29%29%12%1
15638

By Month

Percentage Cloud Cover NE (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
17%14%7%10%6%25%345%20%
1432
16th to endDay
14%15%7%11%9%45%5%45%15%
1647
February1st to 15thDay
13%15%7%10%8%36%45%5%18%
1575
16th to endDay
14%13%5%9%7%45%446%24%
1572
March1st to 15thDay
15%11%5%9%7%36%346%25%
1888
16th to endDay
15%12%6%8%7%35%445%28%
2112
April1st to 15thDay
19%11%45%424446%30%
2153
16th to endDay
16%8%25%6%3435%7%36%
2340
May1st to 15thDay
19%6%25%6%2445%6%36%
2331
16th to endDay
13%6%25%5%3445%7%40%
2479
June1st to 15thDay
11%5%25%435%46%9%39%
2700
16th to endDay
12%426%5%35%5%7%9%38%
2700
July1st to 15thDay
7%425%5%25%6%6%8%42%
2557
16th to endDay
9%5%25%5%35%6%7%9%39%
2556
August1st to 15thDay
10%435%6%35%6%7%8%36%
2340
16th to endDay
11%5%25%5%346%6%7%40%
2483
September1st to 15thDay
13%5%25%5%345%6%8%38%
2028
16th to endDay
13%5%25%5%35%5%6%8%38%
1980
October1st to 15thDay
17%7%36%444446%35%
1866
16th to endDay
21%9%38%5%24436%29%
1832
November1st to 15thDay
16%10%36%7%24447%32%
1582
16th to endDay
15%14%39%7%35%5%5%5%24%
1475
December1st to 15thDay
16%13%7%8%8%35%345%23%
1422
16th to endDay
19%17%7%8%6%4335%5%17%
1368
January1st to 15thNight
20%13%5%7%5%4434424%
2506
16th to endNight
13%12%8%9%7%35%445%24%
2574
February1st to 15thNight
14%14%6%8%5%35%46%5%26%
2285
16th to endNight
15%11%47%8%35%45%6%26%
1899
March1st to 15thNight
15%10%5%7%6%35%345%32%
2049
16th to endNight
15%7%46%5%3345%6%36%
2112
April1st to 15thNight
20%8%3442345%6%34%
1806
16th to endNight
15%6%35%4245%46%40%
1620
May1st to 15thNight
15%7%45%5%35%45%7%36%
1620
16th to endNight
12%4245%34337%46%
1628
June1st to 15thNight
10%425%426%5%5%8%43%
1260
16th to endNight
10%4234345%6%9%46%
1260
July1st to 15thNight
7%32443235%7%55%
1399
16th to endNight
6%3146%345%6%8%49%
1612
August1st to 15thNight
7%425%5%25%5%7%7%46%
1620
16th to endNight
9%5%24434337%52%
1719
September1st to 15thNight
12%41442437%6%47%
1919
16th to endNight
10%4245%23447%48%
1980
October1st to 15thNight
16%5%35%4245%5%6%40%
2094
16th to endNight
21%8%36%5%44445%30%
2390
November1st to 15thNight
14%9%35%5%245%6%6%37%
2276
16th to endNight
21%11%36%42446%6%26%
2484
December1st to 15thNight
19%14%5%7%6%2445%5%24%
2535
16th to endNight
20%13%7%9%7%3444419%
2853

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
17%15%7%11%6%34345%20%
1432
16th to endDay
14%14%7%11%9%46%5%5%416%
1647
February1st to 15thDay
13%15%7%10%8%45%45%5%18%
1575
16th to endDay
13%13%5%9%8%4445%6%24%
1572
March1st to 15thDay
15%10%6%9%7%45%347%24%
1899
16th to endDay
15%11%6%9%7%34445%27%
2111
April1st to 15thDay
18%10%46%425%446%30%
2153
16th to endDay
15%8%36%5%3445%7%36%
2340
May1st to 15thDay
17%7%36%5%2445%7%35%
2331
16th to endDay
12%7%26%5%3445%7%39%
2479
June1st to 15thDay
10%5%25%5%36%5%6%9%39%
2700
16th to endDay
11%5%26%5%45%5%7%9%38%
2700
July1st to 15thDay
7%4346%36%6%6%8%42%
2557
16th to endDay
8%5%245%35%6%7%10%38%
2556
August1st to 15thDay
9%5%25%6%446%7%10%36%
2340
16th to endDay
10%6%25%5%35%5%5%8%39%
2483
September1st to 15thDay
12%6%25%5%345%6%8%38%
2028
16th to endDay
12%5%25%5%35%5%6%8%38%
1980
October1st to 15thDay
16%7%36%6%35%446%36%
1866
16th to endDay
20%10%37%5%34346%29%
1832
November1st to 15thDay
15%9%46%6%34447%31%
1582
16th to endDay
15%12%49%7%46%45%425%
1475
December1st to 15thDay
15%14%6%9%6%45%445%23%
1422
16th to endDay
20%15%6%9%7%2445%417%
1368
January1st to 15thNight
20%13%5%7%7%44435%24%
2506
16th to endNight
12%12%8%10%7%44445%24%
2574
February1st to 15thNight
14%13%6%8%6%35%46%5%26%
2278
16th to endNight
15%12%48%7%45%5%5%6%26%
1899
March1st to 15thNight
15%9%5%8%6%35%435%31%
2061
16th to endNight
15%8%46%6%24446%36%
2112
April1st to 15thNight
19%8%45%32445%7%34%
1806
16th to endNight
14%7%36%5%2345%6%40%
1620
May1st to 15thNight
14%8%35%5%35%447%36%
1619
16th to endNight
12%425%424447%46%
1628
June1st to 15thNight
11%415%435%6%6%8%43%
1260
16th to endNight
9%5%144345%6%9%46%
1260
July1st to 15thNight
6%325%32335%8%53%
1399
16th to endNight
6%3245%446%6%9%48%
1612
August1st to 15thNight
6%5%246%245%6%8%45%
1620
16th to endNight
9%5%25%5%23346%52%
1719
September1st to 15thNight
11%42442446%7%47%
1919
16th to endNight
9%42442335%7%49%
1980
October1st to 15thNight
15%5%35%4245%5%7%40%
2094
16th to endNight
20%8%27%7%34445%30%
2390
November1st to 15thNight
13%8%36%5%3446%6%36%
2276
16th to endNight
20%11%46%5%2445%7%26%
2484
December1st to 15thNight
18%13%5%8%5%345%5%5%23%
2535
16th to endNight
20%13%7%9%7%34445%19%
2853

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
66%410%14%4
1433
16th to endDay
70%6%9%9%4
1647
February1st to 15thDay
65%5%11%11%4
1577
16th to endDay
59%5%11%15%7%1
1572
March1st to 15thDay
60%5%11%15%7%
1899
16th to endDay
57%5%10%18%7%1
2112
April1st to 15thDay
54%410%19%10%
2153
16th to endDay
46%5%14%16%13%2
2340
May1st to 15thDay
48%6%10%22%11%2
2331
16th to endDay
43%6%12%21%14%1
2483
June1st to 15thDay
40%7%12%24%14%
2700
16th to endDay
40%7%13%22%13%1
2700
July1st to 15thDay
34%7%12%26%15%2
2408
16th to endDay
38%9%15%21%13%2
2397
August1st to 15thDay
39%9%14%22%12%1
2327
16th to endDay
40%7%12%25%12%1
2483
September1st to 15thDay
41%6%15%23%11%1
2028
16th to endDay
40%7%12%28%9%
1980
October1st to 15thDay
48%411%21%11%1
1866
16th to endDay
55%6%14%16%6%
1832
November1st to 15thDay
51%6%13%18%9%
1582
16th to endDay
60%5%13%14%5%
1475
December1st to 15thDay
63%5%13%12%3
1422
16th to endDay
68%413%11%2
1368
January1st to 15thNight
61%5%11%13%7%
2506
16th to endNight
60%5%12%17%3
2574
February1st to 15thNight
59%6%10%16%7%
2287
16th to endNight
56%5%10%20%7%
1899
March1st to 15thNight
54%411%20%8%1
2061
16th to endNight
47%412%23%10%1
2112
April1st to 15thNight
48%5%10%20%13%1
1806
16th to endNight
43%6%10%19%18%3
1620
May1st to 15thNight
46%6%10%21%12%3
1620
16th to endNight
37%6%11%25%15%4
1630
June1st to 15thNight
36%7%14%24%15%1
1260
16th to endNight
32%6%16%24%17%2
1260
July1st to 15thNight
28%5%10%31%20%3
1319
16th to endNight
31%7%17%23%17%2
1508
August1st to 15thNight
33%7%13%29%14%2
1609
16th to endNight
32%5%11%32%16%1
1719
September1st to 15thNight
34%6%13%30%13%1
1919
16th to endNight
33%5%12%32%14%
1980
October1st to 15thNight
41%7%11%23%14%
2094
16th to endNight
54%6%12%19%6%
2390
November1st to 15thNight
46%6%14%23%8%1
2276
16th to endNight
55%6%14%16%6%
2484
December1st to 15thNight
61%5%15%13%4
2535
16th to endNight
66%5%10%11%5%
2853

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
24%11%38%23%2
90
16th to endDay
31%8%34%23%11
96
February1st to 15thDay
17%23%48%10%
90
16th to endDay
14%20%39%19%4
81
March1st to 15thDay
28%13%29%22%7%
189
16th to endDay
23%6%32%22%11%2
288
April1st to 15thDay
25%10%29%20%12%2
270
16th to endDay
21%9%28%20%14%6%
270
May1st to 15thDay
21%6%32%21%12%5%
288
16th to endDay
16%6%31%24%13%8%
331
June1st to 15thDay
12%5%31%30%15%4
495
16th to endDay
13%431%28%16%5%
495
July1st to 15thDay
9%324%32%20%9%
475
16th to endDay
9%223%31%22%9%
416
August1st to 15thDay
10%216%30%22%17%
313
16th to endDay
13%318%22%23%18%
332
September1st to 15thDay
11%319%21%26%16%
315
16th to endDay
12%5%16%25%25%14%
314
October1st to 15thDay
18%6%27%23%18%4
315
16th to endDay
19%15%33%23%6%1
248
November1st to 15thDay
15%14%31%24%12%2
90
16th to endDay
15%23%41%10%9%
65
December1st to 15thDay
23%28%28%18%1
60
16th to endDay
27%16%45%10%
68
January1st to 15thNight
26%14%36%19%31
900
16th to endNight
18%10%37%26%6%
846
February1st to 15thNight
22%14%38%20%4
704
16th to endNight
20%13%32%27%5%
631
March1st to 15thNight
20%12%33%27%6%
720
16th to endNight
19%8%29%32%9%1
768
April1st to 15thNight
24%10%30%27%6%
611
16th to endNight
18%5%33%29%9%2
540
May1st to 15thNight
18%5%26%35%12%1
540
16th to endNight
13%329%32%18%1
512
June1st to 15thNight
13%127%41%15%
360
16th to endNight
11%125%42%18%
360
July1st to 15thNight
8%115%43%27%3
469
16th to endNight
7%17%46%25%2
564
August1st to 15thNight
8%15%43%28%3
539
16th to endNight
11%117%34%29%5%
573
September1st to 15thNight
13%419%33%21%7%
681
16th to endNight
13%417%33%25%5%
717
October1st to 15thNight
18%5%28%28%17%2
720
16th to endNight
25%10%33%25%5%
768
November1st to 15thNight
18%10%34%22%11%2
700
16th to endNight
23%14%31%22%7%
720
December1st to 15thNight
26%14%37%18%3
735
16th to endNight
26%11%38%19%3
960
Page generated at 2017-11-01 17:23:42. Version ac04

Copyright 2017 A. Danko


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