Caspers Wilderness Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Caspers Wilderness Park clear sky chart from 2005-11-05 to 2017-09-21.

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
76%
16084
30%
46806
28%
16040
78%
16040
43%
25654

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
72%
716
29%
2306
30%
716
75%
716
41%
1203
January16th to endNight
67%
768
32%
2304
31%
768
70%
768
39%
1281
February1st to 15thNight
74%
697
33%
2104
34%
697
77%
697
44%
1117
February16th to endNight
63%
632
26%
1895
28%
632
66%
632
31%
1172
March1st to 15thNight
72%
720
29%
2160
32%
720
74%
720
42%
1167
March16th to endNight
73%
768
25%
2019
22%
768
75%
768
42%
1194
April1st to 15thNight
66%
719
24%
1799
17%
719
68%
719
40%
1113
April16th to endNight
75%
720
28%
1800
18%
720
76%
720
47%
1044
May1st to 15thNight
72%
602
24%
1682
17%
602
72%
602
36%
1032
May16th to endNight
71%
561
22%
1685
17%
561
72%
561
33%
1036
June1st to 15thNight
76%
540
18%
1620
16%
540
76%
540
29%
1057
June16th to endNight
89%
423
28%
1503
30%
423
89%
423
40%
750
July1st to 15thNight
86%
412
23%
1432
22%
412
86%
412
39%
736
July16th to endNight
85%
653
25%
1675
19%
613
85%
613
44%
967
August1st to 15thNight
88%
717
29%
1790
18%
713
88%
713
50%
1014
August16th to endNight
89%
764
37%
1910
26%
764
89%
764
60%
1005
September1st to 15thNight
87%
720
34%
1851
28%
720
87%
720
55%
996
September16th to endNight
87%
680
39%
1881
39%
680
87%
680
56%
928
October1st to 15thNight
81%
660
35%
1815
35%
660
82%
660
53%
936
October16th to endNight
77%
704
36%
2124
38%
704
78%
704
47%
1070
November1st to 15thNight
82%
700
33%
2275
38%
700
83%
700
50%
1061
November16th to endNight
76%
720
34%
2340
38%
720
78%
720
44%
1172
December1st to 15thNight
69%
720
31%
2340
33%
720
73%
720
36%
1270
December16th to endNight
62%
768
31%
2496
30%
768
68%
768
37%
1333

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
5%313213346%64%
48028
Night
5%413313346%62%
47013
TransparencyDay
21%48%18%25%22%
47728
Night
26%47%15%22%23%
46815
SeeingDay
6%317%37%27%6%
5967
Night
7%16%28%42%13%
16098

By Month

Percentage Cloud Cover SW (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
9%423213345%59%
1629
16th to endDay
11%41331335%5%55%
1920
February1st to 15thDay
9%313223237%58%
1751
16th to endDay
12%5%34323346%49%
1579
March1st to 15thDay
5%4133145%5%9%56%
1800
16th to endDay
421332436%8%57%
2201
April1st to 15thDay
7%413323446%56%
2149
16th to endDay
5%312112246%67%
2160
May1st to 15thDay
45%24322347%60%
2268
16th to endDay
441321335%8%60%
2429
June1st to 15thDay
5%414212236%63%
2340
16th to endDay
11121112481%
2449
July1st to 15thDay
1212213346%69%
2436
16th to endDay
2113223346%68%
2374
August1st to 15thDay
1121236%78%
2160
16th to endDay
111212245%77%
2292
September1st to 15thDay
11221222478%
2109
16th to endDay
12211233476%
1871
October1st to 15thDay
6%322312346%63%
1815
16th to endDay
6%31222233467%
1744
November1st to 15thDay
4212323245%68%
1584
16th to endDay
6%31321335%6%61%
1620
December1st to 15thDay
7%41432436%8%53%
1620
16th to endDay
12%413323336%54%
1728
January1st to 15thNight
7%412323446%58%
2306
16th to endNight
10%5%23322235%57%
2304
February1st to 15thNight
8%312313335%61%
2101
16th to endNight
13%5%23423335%50%
1895
March1st to 15thNight
7%5%2332235%8%56%
2160
16th to endNight
5%42331346%7%56%
2019
April1st to 15thNight
8%6%24423347%53%
1799
16th to endNight
5%413312347%63%
1800
May1st to 15thNight
37%35%312348%55%
1682
16th to endNight
37%34323339%54%
1684
June1st to 15thNight
15%244245%5%9%54%
1620
16th to endNight
21122137%75%
1503
July1st to 15thNight
121232246%8%63%
1518
16th to endNight
221232446%7%61%
1790
August1st to 15thNight
2112222337%70%
1800
16th to endNight
112212245%75%
1910
September1st to 15thNight
2212222235%72%
1851
16th to endNight
23211221377%
1881
October1st to 15thNight
3312312246%68%
1815
16th to endNight
5%313312235%65%
2124
November1st to 15thNight
3312223235%68%
2275
16th to endNight
6%313323346%61%
2340
December1st to 15thNight
8%424413347%55%
2340
16th to endNight
12%42331333458%
2496

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
26%47%14%20%25%
1630
16th to endDay
29%47%15%15%27%
1920
February1st to 15thDay
25%46%16%23%23%
1751
16th to endDay
32%49%18%27%9%
1579
March1st to 15thDay
22%410%21%21%20%
1800
16th to endDay
23%5%14%23%21%12%
2201
April1st to 15thDay
25%410%27%22%9%
2149
16th to endDay
18%412%25%22%17%
2160
May1st to 15thDay
24%5%9%23%22%15%
2268
16th to endDay
23%39%29%25%7%
2432
June1st to 15thDay
26%47%18%29%14%
2340
16th to endDay
13%2412%27%39%
2449
July1st to 15thDay
19%45%13%26%30%
2294
16th to endDay
18%49%22%27%17%
2226
August1st to 15thDay
11%25%16%34%29%
2146
16th to endDay
12%3417%35%27%
2292
September1st to 15thDay
12%45%14%35%29%
2109
16th to endDay
14%2414%32%30%
1871
October1st to 15thDay
22%36%19%23%23%
1815
16th to endDay
20%35%15%20%35%
1744
November1st to 15thDay
18%38%17%19%33%
1584
16th to endDay
22%38%15%20%29%
1620
December1st to 15thDay
26%411%17%17%22%
1620
16th to endDay
30%49%15%20%18%
1728
January1st to 15thNight
26%37%13%19%29%
2306
16th to endNight
30%38%13%13%31%
2304
February1st to 15thNight
25%47%15%21%26%
2112
16th to endNight
38%46%13%22%15%
1895
March1st to 15thNight
26%47%21%18%21%
2160
16th to endNight
27%6%11%19%20%14%
2019
April1st to 15thNight
32%48%22%19%12%
1799
16th to endNight
24%410%22%20%17%
1800
May1st to 15thNight
33%49%18%17%15%
1683
16th to endNight
35%5%8%20%19%10%
1685
June1st to 15thNight
39%6%8%11%21%12%
1620
16th to endNight
21%8%411%25%28%
1503
July1st to 15thNight
25%5%7%13%24%23%
1432
16th to endNight
27%5%9%20%24%13%
1675
August1st to 15thNight
22%5%5%16%30%19%
1790
16th to endNight
17%3413%30%29%
1910
September1st to 15thNight
20%3410%31%28%
1851
16th to endNight
18%2312%31%31%
1881
October1st to 15thNight
20%36%18%29%21%
1815
16th to endNight
23%3412%22%34%
2124
November1st to 15thNight
20%26%15%18%36%
2275
16th to endNight
24%36%17%16%31%
2340
December1st to 15thNight
28%5%7%15%19%23%
2340
16th to endNight
29%310%14%21%20%
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
24%217%39%14%
108
16th to endDay
12%325%36%19%2
288
February1st to 15thDay
9%6%20%34%26%2
266
16th to endDay
14%8%25%34%15%1
238
March1st to 15thDay
8%7%27%28%22%6%
270
16th to endDay
5%9%25%36%19%3
288
April1st to 15thDay
8%7%33%34%12%4
269
16th to endDay
27%35%37%12%4
270
May1st to 15thDay
6%6%22%42%19%2
288
16th to endDay
8%422%38%21%4
330
June1st to 15thDay
7%120%37%28%5%
315
16th to endDay
9%37%41%10%
315
July1st to 15thDay
9%32%43%13%
305
16th to endDay
3330%48%13%
327
August1st to 15thDay
27%39%41%9%
315
16th to endDay
2435%45%12%
332
September1st to 15thDay
29%52%27%7%
315
16th to endDay
3114%47%24%8%
276
October1st to 15thDay
5%324%42%20%3
255
16th to endDay
7%214%42%25%7%
231
November1st to 15thDay
411%24%35%24%
90
16th to endDay
310%14%34%32%5%
90
December1st to 15thDay
35%11%37%36%5%
90
16th to endDay
14%6%14%34%27%3
96
January1st to 15thNight
8%28%38%28%13%
720
16th to endNight
11%19%34%33%9%
768
February1st to 15thNight
8%26%34%36%11%
704
16th to endNight
14%110%37%27%8%
632
March1st to 15thNight
8%29%37%33%8%
720
16th to endNight
8%18%32%39%9%
768
April1st to 15thNight
10%210%36%33%6%
719
16th to endNight
6%28%35%36%9%
720
May1st to 15thNight
8%29%30%40%8%
603
16th to endNight
7%310%28%42%6%
563
June1st to 15thNight
6%29%31%45%4
540
16th to endNight
4320%60%10%
423
July1st to 15thNight
3211%60%20%
412
16th to endNight
338%56%27%
653
August1st to 15thNight
2411%60%22%
717
16th to endNight
328%54%31%
764
September1st to 15thNight
4214%55%23%
720
16th to endNight
5%221%53%17%
680
October1st to 15thNight
45%35%42%12%
660
16th to endNight
8%1426%40%18%
704
November1st to 15thNight
5%5%31%41%16%
700
16th to endNight
6%6%31%37%15%
720
December1st to 15thNight
10%27%34%35%9%
720
16th to endNight
13%212%32%29%8%
768
Page generated at 2017-09-22 04:35:37. Version ac04

Copyright 2017 A. Danko


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