Weinberg-King State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Weinberg-King State Park clear sky chart from 2005-11-05 to 2017-09-19.

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
39%
15925
19%
46890
12%
15880
46%
15880
26%
30109

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
24%
900
17%
2506
7%
895
32%
895
23%
1708
January16th to endNight
22%
960
16%
2505
4%
960
31%
960
21%
1787
February1st to 15thNight
23%
873
13%
2283
3%
871
29%
871
21%
1640
February16th to endNight
25%
631
22%
1893
7%
631
37%
631
25%
1221
March1st to 15thNight
26%
642
18%
2082
10%
642
35%
642
20%
1369
March16th to endNight
27%
576
13%
2046
9%
576
34%
576
15%
1429
April1st to 15thNight
31%
539
17%
1797
12%
539
41%
539
23%
1134
April16th to endNight
33%
540
19%
1800
13%
540
44%
540
21%
1195
May1st to 15thNight
35%
540
17%
1578
10%
540
43%
540
23%
1078
May16th to endNight
47%
563
20%
1497
11%
561
53%
561
30%
993
June1st to 15thNight
57%
540
18%
1440
12%
540
61%
540
39%
870
June16th to endNight
51%
540
19%
1440
10%
540
56%
540
34%
904
July1st to 15thNight
68%
510
18%
1360
13%
510
70%
510
38%
825
July16th to endNight
74%
564
23%
1468
19%
531
76%
531
44%
825
August1st to 15thNight
75%
539
23%
1628
25%
536
77%
536
40%
883
August16th to endNight
69%
573
22%
1910
23%
573
73%
573
34%
1071
September1st to 15thNight
64%
540
29%
1800
30%
540
68%
540
37%
963
September16th to endNight
60%
603
28%
1815
21%
603
67%
603
37%
1013
October1st to 15thNight
49%
660
28%
1980
20%
660
56%
660
35%
1137
October16th to endNight
34%
704
22%
2130
12%
704
45%
704
30%
1292
November1st to 15thNight
35%
700
26%
2276
15%
700
49%
700
28%
1324
November16th to endNight
27%
828
19%
2448
10%
828
37%
828
25%
1579
December1st to 15thNight
24%
900
14%
2520
5%
900
31%
900
19%
1827
December16th to endNight
21%
960
14%
2688
4%
960
29%
960
16%
2042

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
12%7%36%5%3445%7%39%
47929
Night
12%7%35%424446%43%
47064
Cloud CoverDay
13%7%36%5%3445%7%39%
47938
Night
13%6%35%424446%43%
47068
TransparencyDay
43%6%12%22%13%1
47620
Night
40%5%12%23%15%2
46891
SeeingDay
13%6%25%28%19%5%
5952
Night
16%8%30%30%13%1
15926

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
11%11%410%6%3435%6%31%
1432
16th to endDay
15%11%5%8%6%34445%30%
1719
February1st to 15thDay
12%9%46%6%445%5%6%33%
1579
16th to endDay
11%10%47%6%34447%35%
1580
March1st to 15thDay
14%10%46%5%25%445%35%
1877
16th to endDay
16%9%47%5%34447%31%
2178
April1st to 15thDay
16%9%35%434345%39%
2151
16th to endDay
19%6%26%6%3445%6%33%
2160
May1st to 15thDay
18%7%36%5%25%5%5%7%32%
2370
16th to endDay
14%6%36%6%35%5%5%6%37%
2617
June1st to 15thDay
8%5%27%6%35%5%5%9%40%
2520
16th to endDay
8%426%5%35%6%5%8%43%
2520
July1st to 15thDay
6%315%5%35%5%6%9%44%
2520
16th to endDay
5%3245%36%6%7%11%43%
2598
August1st to 15thDay
7%5%246%45%6%6%7%43%
2321
16th to endDay
9%425%425%5%5%8%45%
2292
September1st to 15thDay
11%414333448%48%
2160
16th to endDay
7%424425%5%49%48%
1877
October1st to 15thDay
14%5%15%323345%48%
1650
16th to endDay
15%7%25%414345%46%
1741
November1st to 15thDay
14%7%24424346%46%
1582
16th to endDay
16%9%5%7%423236%38%
1509
December1st to 15thDay
19%11%46%5%2435%6%30%
1440
16th to endDay
19%11%5%7%41435%5%29%
1536
January1st to 15thNight
12%8%46%43445%5%39%
2506
16th to endNight
12%10%47%6%24436%35%
2505
February1st to 15thNight
14%9%5%6%6%25%346%35%
2280
16th to endNight
14%8%35%32434444%
1893
March1st to 15thNight
15%9%26%434345%40%
2070
16th to endNight
16%10%46%5%3445%6%32%
2046
April1st to 15thNight
13%8%25%4245%46%42%
1797
16th to endNight
17%7%25%5%24445%39%
1800
May1st to 15thNight
17%5%26%6%2435%6%38%
1578
16th to endNight
10%5%35%435%5%6%8%43%
1496
June1st to 15thNight
7%5%23434348%50%
1440
16th to endNight
7%415%5%35%5%6%8%46%
1440
July1st to 15thNight
6%313435%5%6%7%51%
1440
16th to endNight
42234245%5%10%53%
1568
August1st to 15thNight
431342445%10%54%
1638
16th to endNight
7%32442445%7%53%
1910
September1st to 15thNight
11%315%312247%55%
1800
16th to endNight
5%31443445%9%51%
1815
October1st to 15thNight
11%413423446%53%
1980
16th to endNight
15%5%23423435%50%
2130
November1st to 15thNight
12%6%24413335%52%
2276
16th to endNight
17%6%245%24346%42%
2448
December1st to 15thNight
19%10%36%5%33445%33%
2520
16th to endNight
20%12%46%5%3334429%
2688

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
11%10%410%6%34346%32%
1432
16th to endDay
15%12%5%7%6%24345%30%
1719
February1st to 15thDay
12%9%5%7%6%35%45%6%33%
1579
16th to endDay
12%10%38%6%345%47%35%
1580
March1st to 15thDay
14%10%45%5%25%445%35%
1888
16th to endDay
16%8%47%6%34446%32%
2176
April1st to 15thDay
16%9%35%424345%39%
2151
16th to endDay
19%6%26%6%3445%6%33%
2160
May1st to 15thDay
18%7%36%5%25%45%7%32%
2370
16th to endDay
14%6%26%6%35%5%46%37%
2617
June1st to 15thDay
8%436%6%25%5%5%9%40%
2520
16th to endDay
9%426%5%35%5%6%7%43%
2520
July1st to 15thDay
7%325%5%45%5%6%10%44%
2520
16th to endDay
5%3245%45%6%7%11%43%
2598
August1st to 15thDay
8%4246%35%6%6%8%44%
2321
16th to endDay
9%425%3345%5%8%46%
2292
September1st to 15thDay
11%414424447%49%
2160
16th to endDay
7%414435%5%39%48%
1877
October1st to 15thDay
14%5%14424246%48%
1650
16th to endDay
15%6%35%323345%46%
1741
November1st to 15thDay
13%7%24324345%46%
1582
16th to endDay
16%8%47%413246%38%
1509
December1st to 15thDay
19%11%46%5%2435%6%30%
1440
16th to endDay
19%11%5%7%42445%5%29%
1536
January1st to 15thNight
12%8%46%435%45%5%39%
2506
16th to endNight
12%10%47%6%24446%36%
2505
February1st to 15thNight
14%9%46%5%25%446%35%
2273
16th to endNight
14%8%35%32334444%
1893
March1st to 15thNight
15%9%36%424336%40%
2082
16th to endNight
16%9%46%5%2445%6%32%
2046
April1st to 15thNight
13%7%2442445%6%42%
1797
16th to endNight
17%6%25%5%24445%40%
1800
May1st to 15thNight
17%6%25%5%3435%7%38%
1577
16th to endNight
10%6%34425%46%7%43%
1496
June1st to 15thNight
8%424434348%50%
1440
16th to endNight
7%325%4445%6%7%46%
1440
July1st to 15thNight
7%224435%46%7%51%
1440
16th to endNight
431342445%10%53%
1568
August1st to 15thNight
43134245%5%9%54%
1638
16th to endNight
7%423423447%53%
1910
September1st to 15thNight
11%424322246%56%
1800
16th to endNight
5%32443445%9%52%
1815
October1st to 15thNight
11%413423446%53%
1980
16th to endNight
15%5%23323335%50%
2130
November1st to 15thNight
12%6%24313335%52%
2276
16th to endNight
17%6%25%424347%42%
2448
December1st to 15thNight
19%9%36%5%23445%33%
2520
16th to endNight
20%12%47%5%3333429%
2688

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
52%412%18%11%
1433
16th to endDay
55%5%13%17%7%
1719
February1st to 15thDay
51%6%15%20%5%
1580
16th to endDay
48%6%13%19%11%
1580
March1st to 15thDay
50%5%14%20%7%1
1888
16th to endDay
52%6%13%20%6%1
2178
April1st to 15thDay
47%410%23%12%1
2151
16th to endDay
49%5%11%20%11%1
2160
May1st to 15thDay
50%6%11%22%8%
2370
16th to endDay
45%7%11%18%14%1
2621
June1st to 15thDay
38%7%12%23%15%1
2520
16th to endDay
37%8%12%22%16%2
2520
July1st to 15thDay
35%8%14%24%13%3
2371
16th to endDay
32%8%15%26%15%
2435
August1st to 15thDay
35%8%15%24%15%1
2307
16th to endDay
33%8%11%22%17%4
2292
September1st to 15thDay
34%5%9%26%18%5%
2160
16th to endDay
33%5%11%30%16%2
1877
October1st to 15thDay
37%48%26%21%2
1650
16th to endDay
40%311%27%14%2
1741
November1st to 15thDay
39%411%21%20%3
1582
16th to endDay
48%313%24%9%
1509
December1st to 15thDay
54%414%19%7%
1440
16th to endDay
55%5%12%16%8%1
1536
January1st to 15thNight
45%412%22%13%
2506
16th to endNight
49%415%21%9%
2505
February1st to 15thNight
50%313%20%10%1
2283
16th to endNight
42%312%27%12%1
1893
March1st to 15thNight
46%311%24%10%2
2082
16th to endNight
51%6%12%20%8%
2046
April1st to 15thNight
41%5%10%24%14%3
1797
16th to endNight
45%6%10%20%14%3
1800
May1st to 15thNight
45%5%11%21%15%
1578
16th to endNight
37%8%12%17%20%3
1498
June1st to 15thNight
30%5%15%26%19%2
1440
16th to endNight
32%8%13%22%20%3
1440
July1st to 15thNight
31%5%11%31%15%4
1360
16th to endNight
25%6%17%29%19%1
1468
August1st to 15thNight
24%7%13%31%18%3
1628
16th to endNight
28%7%11%24%20%6%
1910
September1st to 15thNight
29%310%25%23%7%
1800
16th to endNight
29%412%27%24%2
1815
October1st to 15thNight
30%5%9%25%23%5%
1980
16th to endNight
36%311%25%19%2
2130
November1st to 15thNight
35%311%22%20%5%
2276
16th to endNight
43%312%26%14%
2448
December1st to 15thNight
52%5%13%20%8%
2520
16th to endNight
57%411%17%7%1
2688

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
25%16%34%15%7%
90
16th to endDay
13%21%45%12%6%
96
February1st to 15thDay
15%18%38%17%8%
90
16th to endDay
11%22%29%27%8%1
81
March1st to 15thDay
24%16%46%8%3
90
16th to endDay
27%15%30%19%5%2
162
April1st to 15thDay
19%12%30%25%11%
270
16th to endDay
23%431%24%14%1
270
May1st to 15thDay
21%11%31%23%9%1
396
16th to endDay
18%6%32%25%12%4
517
June1st to 15thDay
10%323%36%20%6%
495
16th to endDay
9%6%31%32%15%5%
495
July1st to 15thDay
9%223%32%22%8%
475
16th to endDay
6%115%34%33%7%
515
August1st to 15thDay
8%114%34%31%9%
474
16th to endDay
8%113%29%34%13%
332
September1st to 15thDay
10%214%31%33%8%
315
16th to endDay
6%5%17%34%25%10%
237
October1st to 15thDay
8%10%25%27%16%11%
90
16th to endDay
16%7%37%31%7%
96
November1st to 15thDay
36%32%32%16%8%
90
16th to endDay
42%17%22%10%7%
90
December1st to 15thDay
16%18%32%20%10%2
90
16th to endDay
29%17%42%9%1
96
January1st to 15thNight
16%13%41%21%6%
900
16th to endNight
17%14%38%25%3
960
February1st to 15thNight
18%11%40%25%4
874
16th to endNight
19%12%39%25%3
631
March1st to 15thNight
19%13%37%24%5%
642
16th to endNight
21%9%35%26%6%
576
April1st to 15thNight
19%12%34%27%5%
539
16th to endNight
19%7%32%31%8%
540
May1st to 15thNight
19%6%32%30%8%1
540
16th to endNight
11%5%28%36%17%1
563
June1st to 15thNight
10%322%46%16%1
540
16th to endNight
8%230%35%20%2
540
July1st to 15thNight
9%14%46%26%2
510
16th to endNight
6%110%44%35%1
564
August1st to 15thNight
5%110%43%35%3
539
16th to endNight
7%112%38%36%3
573
September1st to 15thNight
13%314%35%28%5%
540
16th to endNight
7%5%20%30%29%6%
603
October1st to 15thNight
12%5%27%30%19%3
660
16th to endNight
18%9%34%27%9%
704
November1st to 15thNight
15%11%34%27%10%
700
16th to endNight
21%11%36%24%6%
828
December1st to 15thNight
24%11%34%24%4
900
16th to endNight
26%12%33%23%3
960
Page generated at 2017-09-20 03:49:49. Version ac04

Copyright 2017 A. Danko


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