Wawayanda State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wawayanda State Park clear sky chart from 2005-11-05 to 2018-02-22.

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
29%
15624
19%
48903
9%
15593
41%
15593
21%
31342

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
19%
780
19%
2716
6%
776
35%
776
16%
1719
January16th to endNight
15%
832
20%
2805
5%
832
34%
832
17%
1790
February1st to 15thNight
12%
764
16%
2437
2%
761
28%
761
15%
1618
February16th to endNight
16%
659
25%
1976
7%
659
38%
659
18%
1256
March1st to 15thNight
17%
720
18%
2139
6%
720
32%
720
18%
1409
March16th to endNight
20%
768
22%
2002
7%
768
32%
768
21%
1324
April1st to 15thNight
20%
718
16%
1796
3%
718
27%
718
21%
1272
April16th to endNight
27%
713
18%
1793
3%
713
35%
713
25%
1233
May1st to 15thNight
26%
474
19%
1554
9%
474
37%
474
18%
1027
May16th to endNight
38%
374
15%
1497
12%
374
47%
374
19%
917
June1st to 15thNight
37%
360
14%
1440
11%
360
49%
360
18%
911
June16th to endNight
48%
360
14%
1440
12%
360
59%
360
26%
814
July1st to 15thNight
50%
340
13%
1360
18%
340
54%
340
22%
820
July16th to endNight
55%
376
14%
1418
16%
354
59%
354
23%
815
August1st to 15thNight
50%
545
18%
1616
11%
543
54%
543
32%
987
August16th to endNight
53%
764
20%
1910
10%
764
56%
764
33%
1270
September1st to 15thNight
45%
720
23%
1800
11%
720
50%
720
30%
1192
September16th to endNight
49%
717
27%
1961
19%
717
55%
717
35%
1192
October1st to 15thNight
36%
720
21%
2124
14%
720
44%
720
25%
1374
October16th to endNight
26%
768
22%
2391
11%
768
43%
768
24%
1494
November1st to 15thNight
28%
760
20%
2472
8%
760
44%
760
22%
1531
November16th to endNight
25%
780
22%
2614
11%
780
41%
780
19%
1623
December1st to 15thNight
21%
780
15%
2730
5%
780
33%
780
15%
1836
December16th to endNight
14%
832
17%
2912
3%
832
31%
832
14%
1918

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
16%6%25%5%3445%7%38%
49351
Night
15%6%25%42445%7%41%
49073
Cloud CoverDay
16%6%25%5%3445%7%38%
49360
Night
15%6%25%42345%7%42%
49079
TransparencyDay
44%6%11%21%14%1
49039
Night
41%5%12%22%15%1
48903
SeeingDay
21%14%28%20%11%3
6206
Night
19%14%31%24%9%
15625

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
14%6%245%36%5%45%40%
1552
16th to endDay
14%8%25%5%25%45%6%39%
1768
February1st to 15thDay
16%8%35%6%2445%7%34%
1754
16th to endDay
14%8%25%6%24446%39%
1644
March1st to 15thDay
17%6%35%425%45%7%35%
1809
16th to endDay
17%7%35%5%23337%40%
2220
April1st to 15thDay
18%8%35%313336%40%
2152
16th to endDay
16%5%25%5%33447%41%
2166
May1st to 15thDay
21%6%35%5%25%5%5%6%33%
2406
16th to endDay
15%7%35%6%25%5%5%8%35%
2618
June1st to 15thDay
20%5%245%25%46%7%33%
2520
16th to endDay
14%5%26%6%35%5%5%8%35%
2520
July1st to 15thDay
12%6%36%6%45%6%5%8%34%
2520
16th to endDay
11%5%35%6%36%5%6%8%36%
2654
August1st to 15thDay
13%6%25%5%46%5%6%7%36%
2318
16th to endDay
14%425%435%45%7%41%
2292
September1st to 15thDay
15%425%5%35%45%6%42%
2160
16th to endDay
13%5%15%424345%46%
1998
October1st to 15thDay
18%6%25%424347%40%
1833
16th to endDay
20%5%14424447%41%
1833
November1st to 15thDay
18%7%1442335%5%44%
1716
16th to endDay
17%5%2332345%6%44%
1674
December1st to 15thDay
16%8%46%42445%6%38%
1560
16th to endDay
18%8%34425%45%7%34%
1664
January1st to 15thNight
15%6%24435%45%6%40%
2716
16th to endNight
13%9%35%424347%40%
2805
February1st to 15thNight
14%8%35%5%25%45%6%37%
2436
16th to endNight
16%6%24424346%42%
1976
March1st to 15thNight
18%7%24323347%40%
2126
16th to endNight
16%5%45%313448%41%
2002
April1st to 15thNight
16%7%25%435%45%7%36%
1796
16th to endNight
17%6%245%23446%41%
1793
May1st to 15thNight
17%7%35%32445%6%38%
1554
16th to endNight
15%6%244235%6%6%40%
1495
June1st to 15thNight
20%3245%24447%39%
1440
16th to endNight
10%424425%46%9%45%
1440
July1st to 15thNight
11%425%5%3445%9%42%
1440
16th to endNight
10%323435%6%6%10%41%
1514
August1st to 15thNight
11%4245%2445%8%46%
1626
16th to endNight
13%4245%2435%7%46%
1910
September1st to 15thNight
15%5%24324445%47%
1800
16th to endNight
12%5%14423346%51%
1961
October1st to 15thNight
17%6%25%322346%44%
2124
16th to endNight
17%5%24314346%45%
2391
November1st to 15thNight
15%7%24323446%45%
2472
16th to endNight
16%6%2442435%7%41%
2614
December1st to 15thNight
18%7%35%43445%6%34%
2730
16th to endNight
17%7%35%5%3445%7%36%
2912

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
14%6%25%445%445%41%
1552
16th to endDay
14%7%345%245%5%441%
1768
February1st to 15thDay
16%9%25%6%3445%7%35%
1754
16th to endDay
15%7%35%5%34445%40%
1644
March1st to 15thDay
18%7%34425%447%36%
1819
16th to endDay
17%8%25%5%23336%41%
2219
April1st to 15thDay
17%8%35%323336%41%
2152
16th to endDay
16%5%25%5%33447%41%
2166
May1st to 15thDay
22%6%25%5%345%5%6%33%
2406
16th to endDay
16%6%25%6%25%45%8%34%
2618
June1st to 15thDay
21%425%425%5%6%8%33%
2520
16th to endDay
13%6%26%5%35%5%6%8%35%
2520
July1st to 15thDay
12%5%26%6%46%5%6%8%34%
2520
16th to endDay
11%5%35%6%37%6%6%8%36%
2654
August1st to 15thDay
14%5%26%6%35%5%7%7%35%
2318
16th to endDay
13%425%5%35%5%5%8%40%
2292
September1st to 15thDay
15%4145%35%447%42%
2160
16th to endDay
14%5%25%5%24346%45%
1998
October1st to 15thDay
19%5%25%424346%41%
1833
16th to endDay
20%5%1432445%7%41%
1833
November1st to 15thDay
19%6%23323345%44%
1716
16th to endDay
17%5%23323447%44%
1674
December1st to 15thDay
16%8%36%32445%5%38%
1560
16th to endDay
19%8%35%3345%5%7%35%
1664
January1st to 15thNight
16%6%244345%46%41%
2716
16th to endNight
14%8%25%423447%40%
2805
February1st to 15thNight
14%8%35%5%34446%37%
2429
16th to endNight
16%6%25%43335%7%42%
1976
March1st to 15thNight
18%7%34323346%41%
2139
16th to endNight
16%6%24413447%42%
2002
April1st to 15thNight
16%7%36%42445%8%36%
1796
16th to endNight
17%6%25%5%23346%41%
1793
May1st to 15thNight
18%7%25%32445%5%38%
1554
16th to endNight
16%6%25%42345%8%39%
1495
June1st to 15thNight
20%4245%245%47%39%
1440
16th to endNight
10%3245%3446%10%44%
1440
July1st to 15thNight
11%5%15%5%35%5%5%9%41%
1440
16th to endNight
10%324425%6%7%10%41%
1514
August1st to 15thNight
11%5%1443445%8%45%
1626
16th to endNight
13%425%5%33447%46%
1910
September1st to 15thNight
15%5%23423445%47%
1800
16th to endNight
12%415%413345%51%
1961
October1st to 15thNight
17%6%25%323345%44%
2124
16th to endNight
17%6%23312346%46%
2391
November1st to 15thNight
15%6%25%323446%44%
2472
16th to endNight
17%6%2442336%6%42%
2614
December1st to 15thNight
18%7%35%5%345%5%6%35%
2730
16th to endNight
18%6%25%43445%7%37%
2912

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%5%13%22%12%4
1553
16th to endDay
43%412%23%12%2
1768
February1st to 15thDay
47%5%11%20%12%2
1757
16th to endDay
43%5%11%24%13%1
1644
March1st to 15thDay
46%415%21%10%1
1819
16th to endDay
45%39%20%17%3
2220
April1st to 15thDay
45%49%22%14%4
2152
16th to endDay
43%48%20%19%2
2166
May1st to 15thDay
49%6%8%19%14%2
2406
16th to endDay
47%6%12%18%13%1
2622
June1st to 15thDay
47%7%12%20%10%
2520
16th to endDay
43%8%11%23%12%
2520
July1st to 15thDay
44%7%11%19%15%1
2371
16th to endDay
41%7%13%22%12%2
2487
August1st to 15thDay
43%7%13%19%15%
2304
16th to endDay
40%5%10%25%16%1
2292
September1st to 15thDay
41%6%10%20%20%1
2160
16th to endDay
39%49%21%22%2
1998
October1st to 15thDay
42%6%11%21%16%2
1833
16th to endDay
41%5%11%24%15%1
1833
November1st to 15thDay
41%413%21%16%2
1716
16th to endDay
38%5%11%27%14%1
1674
December1st to 15thDay
45%5%15%18%13%1
1560
16th to endDay
47%6%15%18%10%
1664
January1st to 15thNight
42%5%12%21%13%3
2716
16th to endNight
43%411%24%14%1
2805
February1st to 15thNight
46%5%13%19%12%2
2437
16th to endNight
40%49%25%17%2
1976
March1st to 15thNight
44%314%21%12%3
2139
16th to endNight
41%411%21%17%3
2002
April1st to 15thNight
45%6%9%21%15%1
1796
16th to endNight
43%48%21%19%2
1793
May1st to 15thNight
45%6%10%20%16%1
1554
16th to endNight
41%6%17%18%13%2
1497
June1st to 15thNight
43%6%13%21%13%
1440
16th to endNight
34%7%16%27%14%
1440
July1st to 15thNight
39%7%13%23%14%2
1360
16th to endNight
34%9%17%22%13%2
1418
August1st to 15thNight
34%6%15%26%15%1
1616
16th to endNight
37%6%11%23%19%1
1910
September1st to 15thNight
38%6%9%25%19%
1800
16th to endNight
34%39%23%27%1
1961
October1st to 15thNight
41%410%24%16%1
2124
16th to endNight
39%413%26%15%
2391
November1st to 15thNight
39%5%12%21%17%3
2472
16th to endNight
41%5%12%26%13%2
2614
December1st to 15thNight
47%5%14%20%11%
2730
16th to endNight
46%5%13%21%11%
2912

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%30%30%13%2
90
16th to endDay
22%22%40%12%1
120
February1st to 15thDay
30%33%28%7%
180
16th to endDay
20%27%34%14%3
265
March1st to 15thDay
25%23%27%18%5%
270
16th to endDay
24%19%34%13%5%2
288
April1st to 15thDay
23%18%35%12%8%
270
16th to endDay
23%13%33%15%10%4
270
May1st to 15thDay
34%14%23%15%9%2
288
16th to endDay
19%10%29%26%12%1
331
June1st to 15thDay
22%10%29%22%12%1
315
16th to endDay
17%11%33%24%11%2
315
July1st to 15thDay
15%8%30%27%14%3
305
16th to endDay
11%5%26%32%21%2
326
August1st to 15thDay
17%5%23%31%14%8%
313
16th to endDay
14%5%20%29%20%9%
332
September1st to 15thDay
16%11%25%21%15%9%
315
16th to endDay
17%5%24%22%14%14%
314
October1st to 15thDay
21%7%24%23%17%5%
315
16th to endDay
18%17%32%19%11%
314
November1st to 15thDay
24%13%28%22%7%2
280
16th to endDay
25%23%26%18%32
204
December1st to 15thDay
30%22%26%12%8%
90
16th to endDay
25%34%36%31
96
January1st to 15thNight
18%22%36%17%3
780
16th to endNight
21%20%37%18%1
832
February1st to 15thNight
20%21%40%16%
764
16th to endNight
23%23%33%17%2
659
March1st to 15thNight
24%22%32%17%3
720
16th to endNight
20%21%32%17%5%
768
April1st to 15thNight
20%20%35%19%3
718
16th to endNight
20%15%33%23%6%
713
May1st to 15thNight
22%14%31%24%6%
474
16th to endNight
17%9%28%32%10%1
375
June1st to 15thNight
20%6%28%31%12%
360
16th to endNight
10%430%43%10%
360
July1st to 15thNight
13%227%39%16%
340
16th to endNight
10%323%42%18%2
376
August1st to 15thNight
14%124%39%18%1
545
16th to endNight
15%218%36%25%1
764
September1st to 15thNight
16%7%24%34%15%2
720
16th to endNight
14%5%23%30%21%4
717
October1st to 15thNight
20%9%27%25%14%1
720
16th to endNight
21%16%33%22%6%
768
November1st to 15thNight
19%15%31%20%11%1
760
16th to endNight
19%18%31%21%8%
780
December1st to 15thNight
23%18%33%18%6%
780
16th to endNight
24%20%36%16%1
832
Page generated at 2018-02-23 11:21:33. Version ac04

Copyright 2018 A. Danko


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