Laguna Atacosta Wildlife Refuge
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Laguna Atacosta Wildlife Refuge clear sky chart from 2005-11-05 to 2017-10-06.

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%
4362
0%
28179
0%
3503
0%
3503
29%
28779

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
0%
436
0%
1539
0%
368
0%
368
23%
1685
January16th to endNight
0%
356
0%
1329
0%
259
0%
259
27%
1568
February1st to 15thNight
0%
331
0%
1167
0%
237
0%
237
29%
1294
February16th to endNight
0%
253
0%
1003
0%
180
0%
180
27%
1113
March1st to 15thNight
0%
253
0%
1150
0%
187
0%
187
23%
1196
March16th to endNight
0%
215
0%
1198
0%
172
0%
172
26%
1200
April1st to 15thNight
0%
235
0%
1217
0%
181
0%
181
22%
1185
April16th to endNight
0%
214
0%
1197
0%
178
0%
178
19%
1222
May1st to 15thNight
0%
188
0%
1129
0%
167
0%
167
24%
1086
May16th to endNight
0%
131
0%
1029
0%
103
0%
103
31%
1031
June1st to 15thNight
0%
20
0%
821
0%
19
0%
19
44%
868
June16th to endNight
0%
46
0%
1021
0%
45
0%
45
35%
954
July1st to 15thNight
0%
48
0%
1078
0%
45
0%
45
31%
945
July16th to endNight
0%
30
0%
1032
0%
28
0%
28
48%
819
August1st to 15thNight
0%
15
0%
998
0%
14
0%
14
52%
792
August16th to endNight
0%
48
0%
1408
0%
46
0%
46
28%
1197
September1st to 15thNight
0%
52
0%
1308
0%
52
0%
52
24%
1216
September16th to endNight
0%
76
0%
1342
0%
76
0%
76
21%
1268
October1st to 15thNight
0%
46
0%
857
0%
38
0%
38
37%
958
October16th to endNight
0%
124
0%
915
0%
92
0%
92
39%
1189
November1st to 15thNight
0%
188
0%
1214
0%
165
0%
165
30%
1315
November16th to endNight
0%
249
0%
1196
0%
186
0%
186
34%
1319
December1st to 15thNight
0%
348
0%
1506
0%
300
0%
300
25%
1637
December16th to endNight
0%
460
0%
1525
0%
365
0%
365
26%
1722

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
34%8%17%21%12%4
47671
Night
35%7%17%21%13%5%
47215
SeeingDay
8%112%31%35%10%
5097
Night
13%213%31%32%7%
15189

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 15thDay
55%5%8%12%11%6%
1612
16th to endDay
43%5%11%18%13%7%
1872
February1st to 15thDay
41%5%10%18%15%8%
1751
16th to endDay
37%6%11%21%16%6%
1634
March1st to 15thDay
38%6%14%17%16%6%
1980
16th to endDay
34%7%17%18%14%7%
2112
April1st to 15thDay
33%8%16%23%14%4
1971
16th to endDay
36%9%13%20%15%4
2052
May1st to 15thDay
33%10%18%21%10%5%
2277
16th to endDay
26%9%20%23%17%2
2434
June1st to 15thDay
20%9%19%30%18%2
2340
16th to endDay
28%12%24%25%8%
2340
July1st to 15thDay
33%11%25%25%4
2201
16th to endDay
22%12%29%31%3
2311
August1st to 15thDay
17%9%33%35%3
2203
16th to endDay
33%13%27%20%4
2140
September1st to 15thDay
40%11%17%19%8%
1980
16th to endDay
40%14%17%13%11%2
1980
October1st to 15thDay
29%7%12%24%22%4
1854
16th to endDay
33%5%10%21%20%8%
1760
November1st to 15thDay
40%7%11%20%13%5%
1758
16th to endDay
39%5%12%15%15%10%
1761
December1st to 15thDay
47%7%13%15%11%4
1620
16th to endDay
46%6%11%16%13%4
1728
January1st to 15thNight
50%5%10%15%10%7%
2327
16th to endNight
41%5%8%18%16%9%
2362
February1st to 15thNight
37%5%12%17%17%10%
2112
16th to endNight
38%5%11%18%19%7%
1839
March1st to 15thNight
40%5%12%19%15%6%
1980
16th to endNight
34%6%15%17%18%7%
2112
April1st to 15thNight
40%5%15%21%12%4
1977
16th to endNight
43%7%11%18%13%6%
1905
May1st to 15thNight
39%9%18%16%10%5%
1670
16th to endNight
34%7%19%22%14%1
1685
June1st to 15thNight
20%9%20%29%16%3
1620
16th to endNight
27%10%25%28%8%
1620
July1st to 15thNight
30%11%28%25%4
1530
16th to endNight
17%8%38%31%3
1594
August1st to 15thNight
14%7%36%39%3
1729
16th to endNight
29%12%26%25%5%
2060
September1st to 15thNight
35%10%19%25%6%2
1980
16th to endNight
38%11%17%19%10%2
1980
October1st to 15thNight
24%7%13%26%21%5%
1889
16th to endNight
27%5%9%24%21%9%
2112
November1st to 15thNight
36%6%14%20%16%5%
2100
16th to endNight
33%5%15%18%13%14%
2196
December1st to 15thNight
44%7%13%17%12%5%
2340
16th to endNight
44%5%11%16%14%7%
2496

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
26%21%38%11%2
90
16th to endDay
9%10%34%35%10%
96
February1st to 15thDay
5%228%40%20%3
90
16th to endDay
11%37%37%13%1
81
March1st to 15thDay
17%422%46%8%
90
16th to endDay
10%337%44%4
96
April1st to 15thDay
12%427%45%10%
90
16th to endDay
13%229%33%19%1
162
May1st to 15thDay
10%233%37%15%
414
16th to endDay
5%219%52%16%2
517
June1st to 15thDay
3238%47%8%
495
16th to endDay
6%432%41%15%
495
July1st to 15thDay
9%330%43%12%
475
16th to endDay
415%59%20%
515
August1st to 15thDay
117%57%23%
372
16th to endDay
5%223%45%23%
180
September1st to 15thDay
8%1421%45%18%
135
16th to endDay
8%10%55%24%
135
October1st to 15thDay
214%55%26%
107
16th to endDay
14%6%34%36%8%
96
November1st to 15thDay
31%15%33%26%2
90
16th to endDay
17%5%22%27%17%8%
90
December1st to 15thDay
31%17%25%17%7%
90
16th to endDay
25%6%22%33%9%3
96
January1st to 15thNight
27%317%34%16%
900
16th to endNight
18%420%40%15%
826
February1st to 15thNight
18%324%36%15%
704
16th to endNight
16%5%21%44%11%
577
March1st to 15thNight
17%325%36%16%
540
16th to endNight
12%320%47%13%1
576
April1st to 15thNight
15%423%41%14%
539
16th to endNight
15%320%45%14%
540
May1st to 15thNight
11%220%50%14%
540
16th to endNight
8%14%45%29%2
563
June1st to 15thNight
1132%55%8%
540
16th to endNight
41229%47%14%
540
July1st to 15thNight
6%221%56%12%
510
16th to endNight
3110%65%17%
564
August1st to 15thNight
117%64%25%
539
16th to endNight
5%29%52%29%
573
September1st to 15thNight
8%10%52%27%
540
16th to endNight
12%112%53%19%
537
October1st to 15thNight
4422%53%15%
521
16th to endNight
8%17%34%41%6%
704
November1st to 15thNight
15%19%32%34%6%
700
16th to endNight
12%317%32%30%3
756
December1st to 15thNight
20%414%35%23%2
900
16th to endNight
21%5%21%30%18%2
960
Page generated at 2017-10-07 13:07:49. Version ac04

Copyright 2017 A. Danko


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