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 2017-05-01.

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%
14628
19%
45667
8%
14597
41%
14597
21%
29344

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%
720
19%
2506
6%
716
35%
716
16%
1598
January16th to endNight
15%
768
20%
2589
4%
768
35%
768
16%
1660
February1st to 15thNight
12%
704
16%
2246
3%
701
28%
701
15%
1473
February16th to endNight
17%
631
25%
1893
7%
631
39%
631
18%
1196
March1st to 15thNight
17%
720
18%
2139
6%
720
32%
720
18%
1409
March16th to endNight
19%
768
22%
2002
7%
768
32%
768
21%
1324
April1st to 15thNight
20%
718
17%
1796
3%
718
27%
718
21%
1272
April16th to endNight
27%
713
18%
1793
3%
713
35%
713
25%
1233
May1st to 15thNight
28%
438
20%
1434
9%
438
40%
438
19%
930
May16th to endNight
40%
342
15%
1369
12%
342
49%
342
20%
827
June1st to 15thNight
35%
330
14%
1320
10%
330
48%
330
17%
856
June16th to endNight
51%
330
14%
1320
12%
330
60%
330
26%
742
July1st to 15thNight
50%
310
14%
1240
19%
310
55%
310
22%
743
July16th to endNight
56%
348
13%
1306
15%
326
60%
326
24%
747
August1st to 15thNight
50%
499
19%
1480
12%
497
55%
497
32%
899
August16th to endNight
54%
700
18%
1750
9%
700
56%
700
32%
1173
September1st to 15thNight
46%
660
23%
1650
11%
660
52%
660
30%
1098
September16th to endNight
47%
657
26%
1797
17%
657
54%
657
34%
1103
October1st to 15thNight
34%
660
21%
1947
14%
660
44%
660
25%
1261
October16th to endNight
26%
704
20%
2192
8%
704
42%
704
23%
1389
November1st to 15thNight
28%
700
21%
2277
8%
700
45%
700
23%
1410
November16th to endNight
25%
720
20%
2413
10%
720
38%
720
18%
1530
December1st to 15thNight
20%
720
15%
2520
6%
720
33%
720
15%
1685
December16th to endNight
15%
768
17%
2688
3%
768
32%
768
14%
1786

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%35%45%7%38%
46095
Night
15%6%25%42445%7%41%
45837
Cloud CoverDay
16%6%25%5%3445%7%38%
46104
Night
16%6%25%42445%7%41%
45843
TransparencyDay
44%6%11%21%14%2
45783
Night
41%5%12%22%15%1
45667
SeeingDay
20%14%28%21%11%3
5195
Night
19%14%31%24%8%
14629

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%345%36%5%45%39%
1432
16th to endDay
13%8%25%5%25%5%5%6%39%
1632
February1st to 15thDay
15%8%36%6%2445%7%34%
1615
16th to endDay
14%8%35%6%245%46%39%
1580
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%345%35%5%5%6%34%
2208
16th to endDay
14%6%35%6%25%5%5%8%36%
2394
June1st to 15thDay
21%5%25%425%46%8%32%
2310
16th to endDay
13%5%26%6%35%5%6%8%35%
2310
July1st to 15thDay
11%6%36%6%45%6%5%8%34%
2310
16th to endDay
10%5%35%6%37%6%6%8%37%
2458
August1st to 15thDay
13%5%25%5%45%5%6%7%37%
2125
16th to endDay
14%435%5%35%46%7%39%
2100
September1st to 15thDay
15%425%5%35%45%6%42%
1980
16th to endDay
14%5%15%424346%45%
1832
October1st to 15thDay
18%6%25%424347%40%
1680
16th to endDay
20%5%14424447%39%
1680
November1st to 15thDay
18%7%2341235%5%45%
1581
16th to endDay
18%6%2432345%6%42%
1545
December1st to 15thDay
16%8%46%42445%5%38%
1440
16th to endDay
19%8%34425%447%34%
1536
January1st to 15thNight
16%6%24435%5%5%6%39%
2506
16th to endNight
13%9%35%424447%39%
2589
February1st to 15thNight
13%8%35%5%35%45%6%37%
2245
16th to endNight
15%6%25%424346%43%
1893
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
16%7%35%32445%7%40%
1434
16th to endNight
14%5%244235%6%6%40%
1367
June1st to 15thNight
21%3245%25%5%48%36%
1320
16th to endNight
10%424425%45%9%45%
1320
July1st to 15thNight
11%425%5%3445%9%42%
1320
16th to endNight
9%324435%6%6%10%42%
1402
August1st to 15thNight
11%4245%24448%46%
1490
16th to endNight
14%4245%3435%7%44%
1750
September1st to 15thNight
15%5%24324445%47%
1650
16th to endNight
13%5%14413346%50%
1797
October1st to 15thNight
17%6%25%322346%44%
1947
16th to endNight
18%5%24314346%44%
2192
November1st to 15thNight
15%7%24323346%45%
2277
16th to endNight
17%7%2442445%7%40%
2413
December1st to 15thNight
18%6%35%43445%6%35%
2520
16th to endNight
17%7%35%5%3445%7%35%
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
14%6%25%5%46%45%5%39%
1432
16th to endDay
13%8%345%25%5%6%440%
1632
February1st to 15thDay
15%9%35%6%3445%7%35%
1615
16th to endDay
14%7%35%5%34445%40%
1580
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%245%245%5%6%33%
2208
16th to endDay
15%6%25%6%26%45%8%35%
2394
June1st to 15thDay
21%425%425%5%6%8%32%
2310
16th to endDay
13%6%26%5%35%6%6%8%35%
2310
July1st to 15thDay
12%5%27%6%36%5%6%8%34%
2310
16th to endDay
10%5%35%6%36%6%6%8%36%
2458
August1st to 15thDay
14%425%6%35%5%7%7%36%
2125
16th to endDay
14%5%35%5%345%5%8%38%
2100
September1st to 15thDay
16%4145%34447%42%
1980
16th to endDay
15%5%25%424346%45%
1832
October1st to 15thDay
19%5%25%424347%40%
1680
16th to endDay
20%5%1432445%7%40%
1680
November1st to 15thDay
19%6%23312345%45%
1581
16th to endDay
18%5%23323447%42%
1545
December1st to 15thDay
16%7%36%32445%5%38%
1440
16th to endDay
19%8%25%3335%5%7%34%
1536
January1st to 15thNight
16%6%24434446%40%
2506
16th to endNight
14%8%245%24447%39%
2589
February1st to 15thNight
13%7%36%5%345%46%38%
2238
16th to endNight
16%6%25%43335%7%43%
1893
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
17%6%25%32445%6%40%
1434
16th to endNight
15%6%25%4235%6%8%40%
1367
June1st to 15thNight
20%4245%34448%36%
1320
16th to endNight
10%3245%3446%10%45%
1320
July1st to 15thNight
10%5%16%5%345%5%9%42%
1320
16th to endNight
9%3245%25%6%7%10%41%
1402
August1st to 15thNight
11%5%145%3445%8%46%
1490
16th to endNight
14%425%5%33447%45%
1750
September1st to 15thNight
15%6%23433445%46%
1650
16th to endNight
13%5%14423345%50%
1797
October1st to 15thNight
18%6%25%323245%44%
1947
16th to endNight
18%6%2432335%6%45%
2192
November1st to 15thNight
15%6%25%323446%45%
2277
16th to endNight
17%6%25%42336%7%40%
2413
December1st to 15thNight
18%7%35%43445%6%36%
2520
16th to endNight
18%6%25%5%3445%7%37%
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
43%5%13%22%11%3
1433
16th to endDay
43%412%24%12%2
1632
February1st to 15thDay
47%5%11%21%12%1
1618
16th to endDay
43%5%10%24%13%1
1580
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
48%6%8%19%14%2
2208
16th to endDay
46%6%13%18%14%1
2398
June1st to 15thDay
48%8%13%20%9%
2310
16th to endDay
43%8%11%23%11%1
2310
July1st to 15thDay
45%7%11%19%14%1
2161
16th to endDay
40%7%13%22%12%2
2291
August1st to 15thDay
42%7%13%20%15%
2111
16th to endDay
41%5%9%24%16%1
2100
September1st to 15thDay
41%6%9%19%20%1
1980
16th to endDay
39%49%20%22%2
1832
October1st to 15thDay
42%6%11%21%15%2
1680
16th to endDay
42%5%11%24%14%1
1680
November1st to 15thDay
40%413%20%17%3
1581
16th to endDay
40%5%11%26%13%2
1545
December1st to 15thDay
45%5%16%19%12%1
1440
16th to endDay
47%6%15%19%10%
1536
January1st to 15thNight
43%5%13%21%12%2
2506
16th to endNight
43%411%24%13%1
2589
February1st to 15thNight
45%5%13%20%13%2
2246
16th to endNight
40%39%25%17%2
1893
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
43%6%10%20%17%1
1434
16th to endNight
40%6%18%17%14%2
1369
June1st to 15thNight
45%6%13%20%12%
1320
16th to endNight
33%7%15%28%13%
1320
July1st to 15thNight
39%7%12%23%14%2
1240
16th to endNight
33%9%17%23%13%2
1306
August1st to 15thNight
34%5%15%26%15%1
1480
16th to endNight
38%6%11%22%18%1
1750
September1st to 15thNight
38%6%10%24%19%
1650
16th to endNight
35%38%23%27%1
1797
October1st to 15thNight
41%5%11%23%16%1
1947
16th to endNight
40%414%25%15%
2192
November1st to 15thNight
39%412%21%18%3
2277
16th to endNight
42%5%12%25%12%2
2413
December1st to 15thNight
47%5%14%20%11%
2520
16th to endNight
47%5%13%21%11%
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
23%30%28%16%1
60
16th to endDay
21%23%40%12%2
80
February1st to 15thDay
23%38%26%10%
131
16th to endDay
19%26%35%15%3
239
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
35%11%21%18%10%3
229
16th to endDay
17%11%26%28%14%1
267
June1st to 15thDay
23%10%29%21%12%1
255
16th to endDay
17%5%32%27%13%3
255
July1st to 15thDay
15%8%24%31%15%4
245
16th to endDay
9%6%28%32%21%2
270
August1st to 15thDay
15%421%34%15%8%
253
16th to endDay
15%5%16%29%22%11%
268
September1st to 15thDay
16%9%23%22%17%10%
255
16th to endDay
20%424%22%13%14%
254
October1st to 15thDay
21%9%23%24%16%5%
255
16th to endDay
17%19%34%20%8%
257
November1st to 15thDay
25%13%27%24%6%2
235
16th to endDay
23%23%29%16%43
165
December1st to 15thDay
28%25%25%13%8%
60
16th to endDay
28%29%37%31
64
January1st to 15thNight
19%21%36%18%4
720
16th to endNight
21%20%37%18%1
768
February1st to 15thNight
19%21%41%16%
704
16th to endNight
22%24%33%17%2
631
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
21%13%32%25%7%
438
16th to endNight
16%8%29%34%10%1
343
June1st to 15thNight
21%7%27%30%12%
330
16th to endNight
10%328%45%11%
330
July1st to 15thNight
12%226%40%17%
310
16th to endNight
9%324%42%17%2
348
August1st to 15thNight
14%124%41%17%
499
16th to endNight
15%218%35%25%2
700
September1st to 15thNight
17%6%22%35%15%2
660
16th to endNight
15%5%23%30%21%3
657
October1st to 15thNight
21%10%28%26%13%1
660
16th to endNight
21%15%33%22%5%
704
November1st to 15thNight
20%15%31%20%10%1
700
16th to endNight
20%18%30%21%8%
720
December1st to 15thNight
23%19%32%18%6%
720
16th to endNight
24%20%35%16%2
768
Page generated at 2017-05-02 08:43:32. Version ac04

Copyright 2017 A. Danko


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