Paynes Creek Wetlands
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Paynes Creek Wetlands 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
64%
15101
28%
46900
25%
15065
69%
15065
40%
25194

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
60%
716
19%
2470
20%
716
64%
716
27%
1468
January16th to endNight
55%
768
26%
2496
26%
768
59%
768
27%
1526
February1st to 15thNight
53%
697
23%
2287
23%
697
57%
697
25%
1436
February16th to endNight
50%
632
22%
1934
20%
632
56%
632
27%
1225
March1st to 15thNight
50%
720
16%
2025
14%
720
53%
720
25%
1359
March16th to endNight
48%
768
20%
2082
14%
768
52%
768
30%
1336
April1st to 15thNight
48%
719
22%
1799
10%
719
53%
719
33%
1163
April16th to endNight
55%
720
26%
1800
13%
720
60%
720
46%
1030
May1st to 15thNight
60%
488
28%
1568
21%
488
67%
488
49%
749
May16th to endNight
64%
375
24%
1496
25%
374
71%
374
34%
716
June1st to 15thNight
63%
360
24%
1440
26%
360
74%
360
37%
663
June16th to endNight
79%
360
32%
1440
44%
360
84%
360
56%
527
July1st to 15thNight
89%
340
33%
1360
45%
340
92%
340
69%
445
July16th to endNight
90%
499
40%
1529
41%
467
92%
467
79%
546
August1st to 15thNight
90%
538
39%
1611
32%
535
92%
535
76%
633
August16th to endNight
91%
738
46%
1884
30%
738
92%
738
86%
802
September1st to 15thNight
89%
720
43%
1800
29%
720
91%
720
83%
796
September16th to endNight
80%
671
41%
1838
34%
671
84%
671
69%
820
October1st to 15thNight
69%
660
33%
1980
30%
660
77%
660
52%
945
October16th to endNight
70%
704
34%
2112
35%
704
75%
704
45%
1089
November1st to 15thNight
67%
700
26%
2236
26%
700
71%
700
35%
1230
November16th to endNight
59%
720
21%
2505
23%
720
61%
720
30%
1422
December1st to 15thNight
54%
720
21%
2520
21%
720
59%
720
25%
1544
December16th to endNight
48%
768
21%
2688
20%
768
54%
768
22%
1724

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
9%312212235%64%
47916
Night
11%313212346%58%
47084
TransparencyDay
23%37%18%24%21%
47598
Night
27%48%18%22%18%
46902
SeeingDay
11%8%19%28%23%9%
5865
Night
12%5%12%33%30%5%
15113

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
17%5%23323447%44%
1465
16th to endDay
18%5%24323335%47%
1728
February1st to 15thDay
18%414323436%46%
1576
16th to endDay
16%6%23323448%44%
1538
March1st to 15thDay
21%5%2432345%7%39%
1933
16th to endDay
14%5%2332335%10%44%
2142
April1st to 15thDay
13%5%2442445%7%45%
2149
16th to endDay
7%313313346%62%
2160
May1st to 15thDay
4311213347%66%
2378
16th to endDay
5%313213345%63%
2615
June1st to 15thDay
5%312313245%66%
2520
16th to endDay
211122481%
2520
July1st to 15thDay
1112386%
2520
16th to endDay
111289%
2531
August1st to 15thDay
11112386%
2340
16th to endDay
112289%
2317
September1st to 15thDay
11112484%
2160
16th to endDay
311223478%
1863
October1st to 15thDay
6%212112235%68%
1650
16th to endDay
10%413222236%60%
1760
November1st to 15thDay
12%31331345%7%52%
1623
16th to endDay
15%5%2342344450%
1452
December1st to 15thDay
23%5%13322435%44%
1440
16th to endDay
26%5%33422335%40%
1536
January1st to 15thNight
15%5%2431345%7%46%
2470
16th to endNight
19%424313235%48%
2496
February1st to 15thNight
18%5%14323446%44%
2276
16th to endNight
18%6%23323347%43%
1934
March1st to 15thNight
19%5%2443445%8%38%
2025
16th to endNight
16%414323448%45%
2082
April1st to 15thNight
11%325%43445%7%46%
1799
16th to endNight
10%312212248%60%
1800
May1st to 15thNight
5%33211347%64%
1568
16th to endNight
5%313425%45%7%56%
1496
June1st to 15thNight
5%413313347%61%
1440
16th to endNight
31121222377%
1440
July1st to 15thNight
11111113381%
1440
16th to endNight
11111387%
1635
August1st to 15thNight
111122384%
1620
16th to endNight
1111387%
1884
September1st to 15thNight
1113386%
1800
16th to endNight
21111123478%
1838
October1st to 15thNight
6%212212335%69%
1980
16th to endNight
8%3222335%5%62%
2112
November1st to 15thNight
11%21331345%8%53%
2236
16th to endNight
17%423312347%49%
2505
December1st to 15thNight
24%323212336%45%
2520
16th to endNight
24%5%23312336%41%
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
39%312%18%17%7%
1465
16th to endDay
41%37%16%18%13%
1728
February1st to 15thDay
38%412%16%22%5%
1576
16th to endDay
38%5%7%27%16%3
1538
March1st to 15thDay
44%5%9%19%14%7%
1933
16th to endDay
36%6%13%20%17%5%
2142
April1st to 15thDay
37%6%10%19%21%4
2149
16th to endDay
23%410%24%26%10%
2160
May1st to 15thDay
17%48%21%32%16%
2378
16th to endDay
22%410%23%26%12%
2619
June1st to 15thDay
21%49%18%23%23%
2520
16th to endDay
9%1414%33%37%
2520
July1st to 15thDay
5%1211%30%47%
2371
16th to endDay
5%129%24%56%
2374
August1st to 15thDay
6%1214%31%43%
2324
16th to endDay
41212%33%45%
2317
September1st to 15thDay
6%1311%30%45%
2160
16th to endDay
10%26%21%31%27%
1863
October1st to 15thDay
19%37%19%29%19%
1650
16th to endDay
27%28%20%25%14%
1760
November1st to 15thDay
31%5%10%28%15%8%
1623
16th to endDay
37%5%8%20%17%10%
1452
December1st to 15thDay
42%5%8%16%21%6%
1440
16th to endDay
47%36%17%16%7%
1536
January1st to 15thNight
36%6%12%19%17%7%
2470
16th to endNight
40%37%15%18%14%
2496
February1st to 15thNight
41%48%18%19%7%
2288
16th to endNight
40%410%23%16%4
1934
March1st to 15thNight
43%5%11%16%15%6%
2025
16th to endNight
36%7%12%21%16%6%
2082
April1st to 15thNight
35%6%14%22%15%6%
1799
16th to endNight
24%410%25%26%8%
1800
May1st to 15thNight
19%49%21%30%14%
1569
16th to endNight
24%6%11%25%21%10%
1496
June1st to 15thNight
23%5%8%22%23%17%
1440
16th to endNight
13%2412%33%33%
1440
July1st to 15thNight
8%1210%28%49%
1360
16th to endNight
5%139%22%57%
1529
August1st to 15thNight
7%1216%31%39%
1611
16th to endNight
41216%33%42%
1884
September1st to 15thNight
5%1311%31%47%
1800
16th to endNight
10%25%17%31%32%
1838
October1st to 15thNight
17%36%18%32%20%
1980
16th to endNight
23%37%24%22%17%
2112
November1st to 15thNight
28%6%13%28%14%9%
2236
16th to endNight
34%411%21%18%9%
2505
December1st to 15thNight
40%49%15%23%6%
2520
16th to endNight
44%5%7%15%20%6%
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
31%9%17%24%13%3
93
16th to endDay
21%9%19%17%19%11%
256
February1st to 15thDay
22%8%19%23%23%2
236
16th to endDay
18%15%17%29%15%4
231
March1st to 15thDay
30%10%21%19%11%7%
270
16th to endDay
17%18%26%20%15%1
288
April1st to 15thDay
17%19%24%24%11%2
269
16th to endDay
11%19%22%30%11%3
270
May1st to 15thDay
6%11%32%28%16%4
288
16th to endDay
7%11%19%22%27%11%
330
June1st to 15thDay
7%11%21%30%21%7%
315
16th to endDay
3419%32%28%11%
315
July1st to 15thDay
19%41%34%12%
305
16th to endDay
12%35%34%15%
327
August1st to 15thDay
3116%35%32%11%
315
16th to endDay
1315%34%27%17%
332
September1st to 15thDay
2215%31%32%16%
315
16th to endDay
47%18%29%27%12%
268
October1st to 15thDay
9%11%18%24%22%12%
255
16th to endDay
15%7%18%29%21%7%
272
November1st to 15thDay
16%8%10%20%33%10%
129
16th to endDay
17%429%32%14%1
62
December1st to 15thDay
46%120%25%6%
60
16th to endDay
18%12%32%29%6%
64
January1st to 15thNight
17%410%38%23%5%
720
16th to endNight
20%5%10%30%23%8%
768
February1st to 15thNight
19%6%13%32%23%3
704
16th to endNight
19%7%15%33%18%4
632
March1st to 15thNight
20%10%13%28%22%4
720
16th to endNight
17%9%20%30%21%1
768
April1st to 15thNight
12%10%23%32%18%2
719
16th to endNight
11%6%21%33%21%5%
720
May1st to 15thNight
7%423%35%26%2
489
16th to endNight
6%6%15%36%30%3
375
June1st to 15thNight
6%418%41%26%2
360
16th to endNight
413%42%36%2
360
July1st to 15thNight
15%37%50%3
340
16th to endNight
6%32%54%5%
499
August1st to 15thNight
1330%56%7%
538
16th to endNight
5%36%50%5%
738
September1st to 15thNight
16%30%50%9%
720
16th to endNight
3410%28%40%12%
671
October1st to 15thNight
6%415%33%31%8%
660
16th to endNight
11%410%30%30%12%
704
November1st to 15thNight
11%5%9%36%29%7%
700
16th to endNight
18%311%34%24%7%
720
December1st to 15thNight
25%410%33%21%5%
720
16th to endNight
26%6%12%33%18%2
768
Page generated at 2017-09-20 01:49:47. Version ac04

Copyright 2017 A. Danko


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