Falcon State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Falcon State Park clear sky chart from 2005-11-05 to 2017-09-22.

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%
7250
0%
23318
0%
4501
0%
4501
32%
26346

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%
474
0%
1198
0%
324
0%
324
25%
1490
January16th to endNight
0%
418
0%
1097
0%
261
0%
261
31%
1336
February1st to 15thNight
0%
426
0%
902
0%
224
0%
224
30%
1200
February16th to endNight
0%
413
0%
833
0%
217
0%
217
31%
1054
March1st to 15thNight
0%
378
0%
933
0%
205
0%
205
27%
1089
March16th to endNight
0%
398
0%
1104
0%
237
0%
237
25%
1168
April1st to 15thNight
0%
381
0%
994
0%
218
0%
218
28%
1037
April16th to endNight
0%
371
0%
960
0%
212
0%
212
26%
1073
May1st to 15thNight
0%
393
0%
978
0%
259
0%
259
24%
1021
May16th to endNight
0%
347
0%
883
0%
199
0%
199
33%
943
June1st to 15thNight
0%
185
0%
615
0%
90
0%
90
47%
761
June16th to endNight
0%
203
0%
796
0%
134
0%
134
37%
867
July1st to 15thNight
0%
180
0%
857
0%
132
0%
132
35%
878
July16th to endNight
0%
144
0%
876
0%
78
0%
78
46%
803
August1st to 15thNight
0%
95
0%
838
0%
69
0%
69
50%
803
August16th to endNight
0%
127
0%
1121
0%
98
0%
98
32%
1075
September1st to 15thNight
0%
108
0%
1219
0%
91
0%
91
26%
1142
September16th to endNight
0%
134
0%
1158
0%
106
0%
106
25%
1106
October1st to 15thNight
0%
120
0%
749
0%
90
0%
90
40%
874
October16th to endNight
0%
202
0%
679
0%
120
0%
120
44%
989
November1st to 15thNight
0%
302
0%
978
0%
206
0%
206
33%
1183
November16th to endNight
0%
441
0%
1050
0%
231
0%
231
32%
1369
December1st to 15thNight
0%
465
0%
1252
0%
351
0%
351
30%
1500
December16th to endNight
0%
545
0%
1248
0%
349
0%
349
28%
1585

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
31%5%11%22%19%9%
47498
Night
28%6%14%23%17%9%
47080
SeeingDay
8%8%14%35%25%8%
5071
Night
9%16%20%37%13%1
15190

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
42%49%14%17%11%
1662
16th to endDay
35%5%8%19%18%12%
1920
February1st to 15thDay
33%36%16%21%19%
1751
16th to endDay
32%37%20%22%13%
1580
March1st to 15thDay
34%410%18%15%16%
1941
16th to endDay
30%412%19%17%14%
2112
April1st to 15thDay
29%310%21%21%11%
1971
16th to endDay
32%410%18%20%13%
2103
May1st to 15thDay
33%7%11%21%17%8%
2304
16th to endDay
30%6%11%22%22%6%
2434
June1st to 15thDay
17%6%11%28%27%9%
2340
16th to endDay
27%7%14%25%21%4
2340
July1st to 15thDay
33%7%13%25%17%2
2201
16th to endDay
22%7%17%36%13%1
2221
August1st to 15thDay
16%6%16%40%18%1
2147
16th to endDay
31%8%15%29%13%2
2235
September1st to 15thDay
42%7%13%20%12%3
1980
16th to endDay
37%9%15%16%14%6%
1881
October1st to 15thDay
27%6%9%19%26%10%
1815
16th to endDay
24%46%20%25%17%
1819
November1st to 15thDay
35%5%9%19%19%11%
1758
16th to endDay
30%38%16%21%18%
1635
December1st to 15thDay
41%5%10%16%14%10%
1620
16th to endDay
38%48%17%19%11%
1728
January1st to 15thNight
39%48%16%17%13%
2288
16th to endNight
33%49%20%18%13%
2304
February1st to 15thNight
30%47%19%19%18%
2112
16th to endNight
30%49%21%22%12%
1894
March1st to 15thNight
30%411%22%17%14%
2019
16th to endNight
31%6%14%17%17%12%
2112
April1st to 15thNight
26%7%15%22%17%9%
1977
16th to endNight
33%6%11%21%16%10%
1854
May1st to 15thNight
36%6%16%22%11%6%
1644
16th to endNight
26%7%18%26%18%2
1685
June1st to 15thNight
14%5%17%29%27%5%
1620
16th to endNight
24%6%18%30%18%1
1620
July1st to 15thNight
27%8%20%33%10%
1530
16th to endNight
15%8%28%38%8%
1681
August1st to 15thNight
15%5%25%42%10%
1789
16th to endNight
26%8%21%32%9%1
1967
September1st to 15thNight
32%8%20%25%10%2
1980
16th to endNight
32%9%19%22%10%5%
1891
October1st to 15thNight
20%7%13%23%24%10%
1815
16th to endNight
21%47%25%22%18%
2040
November1st to 15thNight
28%5%11%21%23%9%
2100
16th to endNight
29%411%17%17%20%
2322
December1st to 15thNight
36%411%18%16%10%
2340
16th to endNight
37%39%17%19%13%
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
23%416%34%20%1
90
16th to endDay
10%10%30%30%18%
96
February1st to 15thDay
6%134%27%24%5%
90
16th to endDay
7%8%20%46%13%2
81
March1st to 15thDay
31%118%23%21%4
90
16th to endDay
8%225%56%8%
96
April1st to 15thDay
12%415%44%23%
90
16th to endDay
5%12%31%35%13%1
213
May1st to 15thDay
9%15%32%34%6%1
441
16th to endDay
8%14%26%37%11%1
517
June1st to 15thDay
112%8%45%28%4
495
16th to endDay
412%6%38%28%9%
495
July1st to 15thDay
6%9%8%43%28%3
475
16th to endDay
411%234%37%10%
417
August1st to 15thDay
15%138%35%17%
315
16th to endDay
447%34%29%18%
275
September1st to 15thDay
9%410%47%28%
135
16th to endDay
428%43%40%
108
October1st to 15thDay
7%2440%45%
90
16th to endDay
9%35%29%40%12%
96
November1st to 15thDay
22%117%23%32%3
90
16th to endDay
22%216%24%26%7%
90
December1st to 15thDay
35%112%20%21%10%
90
16th to endDay
21%6%17%27%20%6%
96
January1st to 15thNight
19%18%16%33%11%
861
16th to endNight
10%18%24%37%7%
768
February1st to 15thNight
13%21%26%32%6%
704
16th to endNight
12%19%33%29%5%
632
March1st to 15thNight
12%21%31%28%6%
579
16th to endNight
8%22%38%28%2
576
April1st to 15thNight
7%19%43%27%1
539
16th to endNight
8%20%39%27%3
540
May1st to 15thNight
10%20%41%24%2
540
16th to endNight
419%37%33%4
563
June1st to 15thNight
117%15%55%9%
540
16th to endNight
417%16%48%12%1
540
July1st to 15thNight
6%12%15%52%11%
510
16th to endNight
116%7%58%15%
564
August1st to 15thNight
29%5%57%23%1
539
16th to endNight
5%8%7%46%27%4
573
September1st to 15thNight
8%8%239%34%5%
540
16th to endNight
10%9%6%34%33%5%
513
October1st to 15thNight
5%9%9%45%27%3
495
16th to endNight
5%10%15%42%24%1
632
November1st to 15thNight
10%15%16%36%18%1
700
16th to endNight
12%18%19%32%15%1
882
December1st to 15thNight
17%18%16%32%14%1
900
16th to endNight
18%20%17%29%13%
960
Page generated at 2017-09-23 05:43:38. Version ac04

Copyright 2017 A. Danko


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