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 2017-03-31.

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%
14967
14%
45336
9%
14929
41%
14929
20%
31574

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
28%
560
15%
1655
8%
560
35%
560
21%
1147
April16th to endNight
36%
495
19%
1485
8%
495
45%
495
25%
980
May1st to 15thNight
42%
495
15%
1485
10%
495
47%
495
22%
1006
May16th to endNight
46%
466
16%
1490
12%
466
52%
466
29%
900
June1st to 15thNight
49%
330
16%
1155
15%
330
56%
330
26%
697
June16th to endNight
56%
330
15%
1155
16%
330
61%
330
30%
667
July1st to 15thNight
66%
427
18%
1202
17%
427
68%
427
40%
696
July16th to endNight
65%
522
13%
1388
10%
489
67%
489
35%
845
August1st to 15thNight
63%
494
19%
1474
16%
491
64%
491
32%
884
August16th to endNight
62%
525
22%
1575
16%
525
66%
525
35%
922
September1st to 15thNight
54%
624
22%
1759
15%
624
59%
624
30%
1103
September16th to endNight
57%
657
21%
1815
16%
657
60%
657
34%
1128
October1st to 15thNight
43%
660
17%
1919
13%
660
49%
660
26%
1265
October16th to endNight
24%
704
12%
2192
7%
704
32%
704
14%
1623
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%47%6%35%45%7%32%
45736
Night
15%8%46%5%3445%6%35%
45515
Cloud CoverDay
13%9%47%6%35%45%7%32%
45746
Night
14%9%46%5%3445%6%35%
45519
TransparencyDay
50%6%12%19%10%1
45433
Night
48%5%12%21%10%1
45336
SeeingDay
16%7%27%25%15%7%
5101
Night
18%8%29%28%12%1
14975

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%
2107
April1st to 15thDay
18%11%5%6%5%34446%30%
1973
16th to endDay
16%8%25%6%3435%7%36%
2145
May1st to 15thDay
18%6%26%6%2445%6%35%
2136
16th to endDay
13%6%25%5%3445%7%41%
2267
June1st to 15thDay
11%5%35%5%35%5%6%8%38%
2475
16th to endDay
12%425%5%345%7%9%39%
2475
July1st to 15thDay
8%435%5%25%7%6%8%42%
2344
16th to endDay
9%425%5%36%6%7%9%38%
2368
August1st to 15thDay
10%435%6%35%6%7%8%37%
2145
16th to endDay
11%5%25%5%346%6%8%40%
2275
September1st to 15thDay
14%5%26%5%3446%8%37%
1859
16th to endDay
14%5%26%5%35%5%6%8%37%
1815
October1st to 15thDay
17%7%37%444446%35%
1711
16th to endDay
23%8%28%5%24436%29%
1680
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%35%433446%35%
1655
16th to endNight
16%6%35%424446%41%
1485
May1st to 15thNight
14%7%45%5%35%45%7%36%
1485
16th to endNight
12%424434337%47%
1488
June1st to 15thNight
11%425%426%5%5%8%43%
1155
16th to endNight
9%423435%5%6%10%45%
1155
July1st to 15thNight
7%324422347%55%
1282
16th to endNight
6%3146%345%6%9%48%
1492
August1st to 15thNight
8%4245%25%5%7%7%46%
1485
16th to endNight
9%5%24323337%52%
1575
September1st to 15thNight
13%5%1442436%6%47%
1759
16th to endNight
10%4345%23447%47%
1815
October1st to 15thNight
15%4244245%6%7%41%
1919
16th to endNight
22%8%36%5%44446%29%
2192
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
14%11%6%9%7%34445%27%
2106
April1st to 15thDay
18%10%5%6%425%446%29%
1973
16th to endDay
15%8%36%5%34447%36%
2145
May1st to 15thDay
17%7%36%5%2445%7%34%
2136
16th to endDay
12%7%25%5%34447%41%
2267
June1st to 15thDay
10%6%25%5%36%5%6%9%38%
2475
16th to endDay
10%5%26%5%45%5%7%9%39%
2475
July1st to 15thDay
7%4346%35%6%6%8%42%
2344
16th to endDay
8%5%246%36%6%7%10%38%
2368
August1st to 15thDay
9%5%25%6%45%6%6%10%36%
2145
16th to endDay
10%6%25%5%346%6%8%40%
2275
September1st to 15thDay
13%6%25%6%445%5%8%37%
1859
16th to endDay
13%6%25%5%35%5%6%8%37%
1815
October1st to 15thDay
15%7%36%6%35%446%36%
1711
16th to endDay
21%10%36%5%34346%29%
1680
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%7%45%334347%35%
1655
16th to endNight
15%8%35%5%23446%40%
1485
May1st to 15thNight
14%8%35%5%25%448%36%
1484
16th to endNight
12%425%424347%47%
1488
June1st to 15thNight
12%424435%6%6%7%43%
1155
16th to endNight
8%5%144345%6%9%45%
1155
July1st to 15thNight
7%325%32335%8%54%
1282
16th to endNight
6%3245%446%6%9%48%
1492
August1st to 15thNight
7%4245%245%6%8%45%
1485
16th to endNight
9%5%25%423346%52%
1575
September1st to 15thNight
12%5%25%42336%7%46%
1759
16th to endNight
10%5%3442335%7%48%
1815
October1st to 15thNight
15%5%25%4245%6%7%41%
1919
16th to endNight
21%9%37%6%34446%29%
2192
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
2107
April1st to 15thDay
54%410%19%10%
1973
16th to endDay
46%5%14%15%14%2
2145
May1st to 15thDay
48%6%10%21%11%
2136
16th to endDay
42%5%11%22%15%1
2271
June1st to 15thDay
41%7%12%23%14%
2475
16th to endDay
40%7%13%22%14%1
2475
July1st to 15thDay
34%8%12%26%15%2
2195
16th to endDay
38%9%16%20%12%2
2209
August1st to 15thDay
39%9%14%21%13%1
2132
16th to endDay
39%7%12%26%12%1
2275
September1st to 15thDay
42%6%15%23%10%
1859
16th to endDay
42%7%12%27%9%
1815
October1st to 15thDay
48%5%11%21%11%1
1711
16th to endDay
56%6%15%16%5%
1680
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%410%20%14%1
1655
16th to endNight
43%5%9%18%20%3
1485
May1st to 15thNight
45%6%10%22%12%2
1485
16th to endNight
37%5%11%25%15%5%
1490
June1st to 15thNight
37%6%13%25%16%
1155
16th to endNight
32%7%16%22%18%2
1155
July1st to 15thNight
28%5%9%31%21%2
1202
16th to endNight
31%7%18%22%16%3
1388
August1st to 15thNight
33%7%13%29%14%2
1474
16th to endNight
32%5%11%32%16%1
1575
September1st to 15thNight
36%6%13%29%13%1
1759
16th to endNight
34%5%13%31%13%
1815
October1st to 15thNight
39%8%12%23%15%
1919
16th to endNight
55%6%12%19%5%
2192
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%33%23%11%2
286
April1st to 15thDay
22%11%27%21%13%2
210
16th to endDay
22%6%25%21%16%8%
210
May1st to 15thDay
18%6%31%23%13%6%
228
16th to endDay
14%5%27%26%15%10%
267
June1st to 15thDay
13%5%31%30%14%4
420
16th to endDay
13%328%29%18%6%
420
July1st to 15thDay
10%324%33%20%9%
400
16th to endDay
9%224%31%22%9%
354
August1st to 15thDay
10%115%31%20%19%
253
16th to endDay
13%216%23%22%21%
268
September1st to 15thDay
13%317%22%26%15%
255
16th to endDay
13%5%16%26%25%11%
254
October1st to 15thDay
16%6%28%25%18%3
255
16th to endDay
22%15%31%23%5%1
192
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
23%10%32%25%6%1
560
16th to endNight
20%6%30%30%10%2
495
May1st to 15thNight
17%5%27%35%12%1
495
16th to endNight
13%327%34%19%2
468
June1st to 15thNight
14%227%40%15%
330
16th to endNight
11%124%42%20%
330
July1st to 15thNight
8%15%43%26%3
427
16th to endNight
7%18%45%25%2
522
August1st to 15thNight
8%15%43%28%3
494
16th to endNight
12%116%34%29%4
525
September1st to 15thNight
14%5%19%33%20%6%
624
16th to endNight
13%418%34%24%5%
657
October1st to 15thNight
17%428%29%18%1
660
16th to endNight
25%10%33%24%4
704
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 2017-04-01 08:23:16. Version ac04

Copyright 2017 A. Danko


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