Estero Llano Grande State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Estero Llano Grande State Park clear sky chart from 2005-11-06 to 2024-01-13.

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
0%
9511
0%
42125
0%
6788
0%
6788
30%
43950

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
0%
522
0%
1330
0%
344
0%
344
29%
1640
January11th to 20thNight
0%
484
0%
1281
0%
336
0%
336
28%
1523
January21st to endNight
0%
441
0%
1421
0%
311
0%
311
23%
1588
February1st to 10thNight
0%
432
0%
1260
0%
308
0%
308
25%
1399
February11th to 20thNight
0%
431
0%
1181
0%
310
0%
310
26%
1321
February21st to endNight
0%
376
0%
961
0%
239
0%
239
24%
1092
March1st to 10thNight
0%
334
0%
1115
0%
231
0%
231
25%
1141
March11th to 20thNight
0%
345
0%
1233
0%
259
0%
259
20%
1228
March21st to endNight
0%
400
0%
1225
0%
260
0%
260
26%
1249
April1st to 10thNight
0%
350
0%
1233
0%
243
0%
243
23%
1175
April11th to 20thNight
0%
331
0%
1217
0%
239
0%
239
20%
1208
April21st to endNight
0%
348
0%
1192
0%
256
0%
256
22%
1198
May1st to 10thNight
0%
350
0%
1046
0%
259
0%
259
25%
1053
May11th to 20thNight
0%
276
0%
989
0%
200
0%
200
28%
1016
May21st to endNight
0%
240
0%
1015
0%
151
0%
151
34%
1014
June1st to 10thNight
0%
97
0%
746
0%
61
0%
61
49%
820
June11th to 20thNight
0%
113
0%
749
0%
70
0%
70
41%
880
June21st to endNight
0%
119
0%
961
0%
85
0%
85
37%
919
July1st to 10thNight
0%
91
0%
1095
0%
78
0%
78
31%
984
July11th to 20thNight
0%
61
0%
947
0%
49
0%
49
46%
819
July21st to endNight
0%
51
0%
951
0%
36
0%
36
55%
804
August1st to 10thNight
0%
31
0%
923
0%
13
0%
13
58%
770
August11th to 20thNight
0%
42
0%
1044
0%
26
0%
26
47%
848
August21st to endNight
0%
57
0%
1320
0%
48
0%
48
35%
1123
September1st to 10thNight
0%
55
0%
1254
0%
53
0%
53
30%
1110
September11th to 20thNight
0%
95
0%
1302
0%
88
0%
88
25%
1188
September21st to endNight
0%
79
0%
1094
0%
69
0%
69
31%
1084
October1st to 10thNight
0%
63
0%
822
0%
54
0%
54
40%
959
October11th to 20thNight
0%
141
0%
965
0%
109
0%
109
35%
1096
October21st to endNight
0%
274
0%
865
0%
172
0%
172
44%
1250
November1st to 10thNight
0%
241
0%
1049
0%
182
0%
182
38%
1258
November11th to 20thNight
0%
308
0%
1294
0%
244
0%
244
29%
1447
November21st to endNight
0%
426
0%
1341
0%
314
0%
314
32%
1521
December1st to 10thNight
0%
447
0%
1402
0%
341
0%
341
30%
1642
December11th to 20thNight
0%
500
0%
1650
0%
367
0%
367
25%
1844
December21st to endNight
0%
560
0%
2652
0%
383
0%
383
20%
2739

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
TransparencyDay
36%7%14%22%15%6%
74533
Night
33%7%16%23%14%6%
74757
SeeingDay
10%422%34%22%7%
13179
Night
13%423%37%20%2
23310

By Month

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
43%48%17%19%10%
1708
11th to 20thDay
41%410%17%15%12%
1719
21st to endDay
43%5%11%17%15%10%
1980
February1st to 10thDay
44%5%9%16%16%11%
1800
11th to 20thDay
36%6%11%22%17%8%
1759
21st to endDay
37%5%12%20%18%9%
1515
March1st to 10thDay
42%5%11%20%14%8%
1980
11th to 20thDay
42%5%13%14%17%9%
1980
21st to endDay
35%5%14%21%15%10%
2178
April1st to 10thDay
38%6%13%21%14%8%
1980
11th to 20thDay
39%7%13%21%15%6%
1956
21st to endDay
34%7%12%20%18%8%
2034
May1st to 10thDay
33%7%16%23%14%7%
2340
11th to 20thDay
36%7%12%25%16%4
2306
21st to endDay
31%8%15%22%21%3
2531
June1st to 10thDay
25%7%15%29%20%3
2340
11th to 20thDay
28%8%14%26%22%3
2340
21st to endDay
36%11%18%25%10%1
2340
July1st to 10thDay
40%10%17%25%8%
2276
11th to 20thDay
27%9%22%28%13%1
2271
21st to endDay
24%8%24%33%10%
2399
August1st to 10thDay
21%9%23%36%10%1
2136
11th to 20thDay
25%10%24%33%8%
2123
21st to endDay
37%12%21%21%8%1
2196
September1st to 10thDay
43%11%15%18%12%2
1980
11th to 20thDay
46%13%15%15%9%3
1980
21st to endDay
37%10%15%21%12%5%
1980
October1st to 10thDay
32%7%10%21%23%6%
1980
11th to 20thDay
32%7%13%20%18%10%
1902
21st to endDay
27%5%8%21%25%13%
1980
November1st to 10thDay
35%8%10%21%19%6%
1858
11th to 20thDay
44%49%17%17%8%
1900
21st to endDay
40%412%19%17%9%
1782
December1st to 10thDay
43%411%21%14%7%
1710
11th to 20thDay
42%6%12%13%15%13%
2159
21st to endDay
43%5%8%21%19%5%
3135
January1st to 10thNight
42%48%19%18%10%
2458
11th to 20thNight
42%49%16%15%14%
2318
21st to endNight
45%5%9%18%14%8%
2376
February1st to 10thNight
43%5%11%16%14%11%
2160
11th to 20thNight
41%5%11%19%17%8%
2098
21st to endNight
41%5%9%19%18%8%
1740
March1st to 10thNight
36%6%14%22%14%7%
1980
11th to 20thNight
42%6%14%15%15%8%
1980
21st to endNight
34%7%15%19%16%8%
2178
April1st to 10thNight
39%6%17%21%12%5%
1980
11th to 20thNight
42%6%14%18%13%7%
1953
21st to endNight
40%9%14%17%13%8%
1918
May1st to 10thNight
38%10%17%17%13%5%
1620
11th to 20thNight
37%8%16%23%13%2
1594
21st to endNight
28%9%20%26%15%1
1746
June1st to 10thNight
19%7%20%31%21%2
1620
11th to 20thNight
23%8%14%35%16%3
1620
21st to endNight
24%11%24%30%10%1
1620
July1st to 10thNight
31%12%26%25%6%
1575
11th to 20thNight
19%9%32%32%8%
1566
21st to endNight
14%8%35%35%8%
1673
August1st to 10thNight
11%7%34%41%7%
1779
11th to 20thNight
16%9%34%37%4
1778
21st to endNight
23%10%28%31%7%1
2160
September1st to 10thNight
29%10%24%25%9%2
1980
11th to 20thNight
34%11%21%22%10%2
1980
21st to endNight
28%10%18%26%14%5%
1980
October1st to 10thNight
22%6%13%30%23%6%
1980
11th to 20thNight
28%6%13%25%17%11%
2038
21st to endNight
24%5%7%25%26%13%
2376
November1st to 10thNight
28%7%13%23%23%7%
2220
11th to 20thNight
38%6%12%20%15%8%
2280
21st to endNight
39%413%20%15%10%
2394
December1st to 10thNight
41%411%20%16%7%
2470
11th to 20thNight
38%6%10%19%13%14%
3037
21st to endNight
43%411%14%18%9%
4532

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
19%11%29%26%10%4
270
11th to 20thDay
22%5%32%29%10%2
248
21st to endDay
21%11%37%19%10%2
264
February1st to 10thDay
18%9%34%24%14%1
240
11th to 20thDay
19%9%39%25%8%
240
21st to endDay
16%11%47%19%6%1
198
March1st to 10thDay
23%9%33%30%5%
240
11th to 20thDay
20%8%37%30%5%1
240
21st to endDay
11%12%46%28%3
264
April1st to 10thDay
15%9%39%27%8%2
240
11th to 20thDay
12%11%38%28%9%2
234
21st to endDay
10%10%43%29%7%2
294
May1st to 10thDay
8%8%47%26%11%1
603
11th to 20thDay
8%7%41%33%10%1
625
21st to endDay
6%334%42%13%2
679
June1st to 10thDay
3218%42%27%8%
630
11th to 20thDay
5%115%53%21%4
630
21st to endDay
7%212%41%28%10%
630
July1st to 10thDay
9%111%40%32%7%
621
11th to 20thDay
416%42%38%9%
618
21st to endDay
5%15%42%36%11%
678
August1st to 10thDay
6%53%28%12%
447
11th to 20thDay
27%47%33%11%
437
21st to endDay
218%23%39%27%
315
September1st to 10thDay
11%1426%39%19%
270
11th to 20thDay
8%424%33%31%
270
21st to endDay
5%19%23%40%22%
270
October1st to 10thDay
8%18%29%35%19%
270
11th to 20thDay
9%13%27%35%16%
270
21st to endDay
11%6%22%33%22%5%
297
November1st to 10thDay
13%314%34%32%5%
270
11th to 20thDay
27%414%23%21%9%
270
21st to endDay
24%8%29%19%13%6%
270
December1st to 10thDay
21%5%21%28%18%7%
270
11th to 20thDay
16%10%26%28%15%4
270
21st to endDay
21%8%26%31%10%3
297
January1st to 10thNight
22%6%27%32%12%1
950
11th to 20thNight
22%7%28%35%8%
854
21st to endNight
22%6%27%35%9%
792
February1st to 10thNight
22%6%33%33%7%1
720
11th to 20thNight
20%8%33%33%5%
704
21st to endNight
19%9%40%26%7%
556
March1st to 10thNight
18%11%34%33%6%
540
11th to 20thNight
16%8%40%32%4
540
21st to endNight
13%8%46%28%4
594
April1st to 10thNight
14%6%45%29%6%
540
11th to 20thNight
15%8%39%32%6%
533
21st to endNight
14%6%44%31%5%
540
May1st to 10thNight
9%6%49%29%6%
540
11th to 20thNight
11%437%41%6%
531
21st to endNight
6%332%45%13%1
584
June1st to 10thNight
4113%55%26%1
540
11th to 20thNight
2217%56%22%1
540
21st to endNight
5%116%44%31%3
540
July1st to 10thNight
8%18%53%26%3
525
11th to 20thNight
417%51%36%2
522
21st to endNight
41452%37%2
591
August1st to 10thNight
15%50%41%3
537
11th to 20thNight
25%45%43%4
534
21st to endNight
6%1431%52%7%
594
September1st to 10thNight
7%331%50%9%
540
11th to 20thNight
11%15%23%51%9%
540
21st to endNight
8%16%31%45%10%
540
October1st to 10thNight
426%36%46%7%
540
11th to 20thNight
11%210%40%34%3
598
21st to endNight
8%423%42%22%2
792
November1st to 10thNight
11%418%43%23%2
740
11th to 20thNight
18%319%37%21%2
760
21st to endNight
19%5%25%35%15%1
874
December1st to 10thNight
19%424%36%15%2
950
11th to 20thNight
20%6%26%34%13%1
950
21st to endNight
19%6%28%34%12%
1045
Page generated at 2024-01-10 18:35:20. Version ac07

Copyright 2024 Attilla Danko


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