Tuckahoe State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Tuckahoe State Park clear sky chart from 2005-11-05 to 2017-04-26.

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
40%
14817
20%
45628
12%
14780
49%
14780
25%
28852

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
25%
718
21%
2476
9%
716
41%
716
20%
1527
January16th to endNight
25%
768
22%
2496
9%
768
42%
768
22%
1566
February1st to 15thNight
22%
703
19%
2267
7%
701
38%
701
22%
1431
February16th to endNight
21%
631
25%
1893
8%
631
42%
631
23%
1188
March1st to 15thNight
28%
720
20%
2061
10%
720
40%
720
26%
1319
March16th to endNight
27%
768
20%
2050
9%
768
36%
768
26%
1374
April1st to 15thNight
27%
718
19%
1796
5%
718
35%
718
30%
1175
April16th to endNight
39%
704
19%
1760
7%
704
43%
704
30%
1175
May1st to 15thNight
41%
516
17%
1506
9%
516
46%
516
24%
1023
May16th to endNight
54%
342
14%
1369
14%
342
59%
342
22%
834
June1st to 15thNight
54%
330
18%
1320
18%
330
61%
330
22%
809
June16th to endNight
61%
330
14%
1320
16%
330
64%
330
24%
775
July1st to 15thNight
59%
310
14%
1240
18%
310
60%
310
19%
786
July16th to endNight
71%
440
15%
1390
15%
410
74%
410
30%
811
August1st to 15thNight
69%
530
18%
1510
14%
527
70%
527
32%
940
August16th to endNight
65%
700
17%
1750
10%
700
65%
700
34%
1166
September1st to 15thNight
61%
660
25%
1650
16%
660
64%
660
34%
1096
September16th to endNight
55%
657
21%
1785
18%
657
57%
657
28%
1183
October1st to 15thNight
47%
660
22%
1980
20%
660
53%
660
27%
1259
October16th to endNight
39%
704
26%
2112
17%
704
52%
704
32%
1243
November1st to 15thNight
39%
700
23%
2274
15%
700
51%
700
27%
1374
November16th to endNight
34%
720
20%
2415
12%
720
46%
720
22%
1507
December1st to 15thNight
28%
720
18%
2520
8%
720
41%
720
19%
1603
December16th to endNight
26%
768
21%
2688
9%
768
42%
768
20%
1688

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
13%5%2442445%7%43%
46026
Night
14%5%2442445%7%43%
45808
Cloud CoverDay
13%5%2442445%7%43%
46036
Night
14%5%2442445%7%43%
45813
TransparencyDay
38%6%12%23%16%2
45724
Night
39%5%12%22%16%3
45628
SeeingDay
16%6%23%24%19%8%
5193
Night
16%8%28%31%13%1
14821

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
15%6%25%424446%43%
1459
16th to endDay
17%5%24324346%44%
1728
February1st to 15thDay
15%6%2442345%6%43%
1592
16th to endDay
13%6%345%25%45%6%42%
1580
March1st to 15thDay
14%5%24424445%46%
1885
16th to endDay
16%6%25%5%24336%43%
2173
April1st to 15thDay
14%5%24324447%46%
2152
16th to endDay
15%5%3432335%6%46%
2112
May1st to 15thDay
15%5%25%3245%6%9%39%
2122
16th to endDay
12%4244246%6%9%42%
2394
June1st to 15thDay
11%324435%5%7%10%40%
2310
16th to endDay
9%2243245%7%10%46%
2310
July1st to 15thDay
8%4245%25%5%6%10%43%
2310
16th to endDay
43245%36%6%8%12%41%
2363
August1st to 15thDay
9%5%25%4345%7%9%42%
2098
16th to endDay
8%4146%35%6%7%7%44%
2100
September1st to 15thDay
12%42443445%7%45%
1980
16th to endDay
15%6%25%4345%46%40%
1843
October1st to 15thDay
17%5%23323445%46%
1650
16th to endDay
15%425%323345%50%
1760
November1st to 15thDay
16%5%23324446%47%
1584
16th to endDay
15%5%1442345%5%45%
1545
December1st to 15thDay
15%5%24424447%43%
1440
16th to endDay
17%6%35%42335%5%41%
1536
January1st to 15thNight
16%5%24424447%41%
2476
16th to endNight
17%6%2432435%5%44%
2496
February1st to 15thNight
15%6%26%42435%5%43%
2266
16th to endNight
16%5%14434336%46%
1893
March1st to 15thNight
16%5%23424437%45%
2049
16th to endNight
16%5%25%5%24346%42%
2050
April1st to 15thNight
12%5%25%425%45%7%45%
1796
16th to endNight
17%41342445%6%45%
1760
May1st to 15thNight
14%7%25%5%245%5%6%40%
1506
16th to endNight
10%5%345%35%45%9%42%
1367
June1st to 15thNight
11%5%24436%5%48%42%
1320
16th to endNight
8%425%5%35%6%7%8%41%
1320
July1st to 15thNight
7%5%25%5%36%7%6%10%37%
1320
16th to endNight
6%315%5%36%6%7%12%41%
1494
August1st to 15thNight
7%425%5%35%5%6%9%44%
1521
16th to endNight
9%425%5%245%6%8%44%
1750
September1st to 15thNight
12%5%15%42345%7%46%
1650
16th to endNight
14%6%245%34446%43%
1785
October1st to 15thNight
16%6%25%423245%45%
1980
16th to endNight
15%414322345%50%
2112
November1st to 15thNight
13%5%24423345%49%
2274
16th to endNight
14%5%24435%45%6%42%
2415
December1st to 15thNight
17%5%25%4235%6%6%39%
2520
16th to endNight
17%5%2442345%6%41%
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%35%423446%44%
1459
16th to endDay
17%6%24324445%44%
1728
February1st to 15thDay
15%6%2442445%6%43%
1592
16th to endDay
13%6%44434445%42%
1580
March1st to 15thDay
14%5%244335%45%45%
1896
16th to endDay
16%6%245%24335%43%
2172
April1st to 15thDay
14%424324446%47%
2152
16th to endDay
15%5%34324345%47%
2112
May1st to 15thDay
15%5%3432447%9%39%
2122
16th to endDay
12%415%4245%6%9%42%
2394
June1st to 15thDay
11%423425%6%7%10%40%
2310
16th to endDay
9%323425%6%7%10%45%
2310
July1st to 15thDay
8%4245%346%6%9%42%
2310
16th to endDay
5%3245%36%5%9%11%41%
2363
August1st to 15thDay
9%5%25%5%345%7%9%41%
2098
16th to endDay
8%425%5%46%5%6%8%43%
2100
September1st to 15thDay
11%5%24435%36%7%45%
1980
16th to endDay
16%6%25%42445%5%40%
1843
October1st to 15thDay
17%424424445%46%
1650
16th to endDay
15%324332246%50%
1760
November1st to 15thDay
16%5%133235%5%6%46%
1584
16th to endDay
15%6%2442336%6%45%
1545
December1st to 15thDay
15%5%2441445%6%43%
1440
16th to endDay
18%6%35%423346%41%
1536
January1st to 15thNight
16%5%34435%447%42%
2476
16th to endNight
17%6%24414346%43%
2496
February1st to 15thNight
14%6%25%42435%6%43%
2259
16th to endNight
16%5%23424436%47%
1893
March1st to 15thNight
16%5%24323347%45%
2061
16th to endNight
16%5%35%423446%42%
2050
April1st to 15thNight
13%5%2443435%6%45%
1796
16th to endNight
17%41342445%6%44%
1760
May1st to 15thNight
14%7%35%4235%5%8%39%
1506
16th to endNight
10%6%25%5%2445%9%42%
1367
June1st to 15thNight
11%5%145%26%448%42%
1320
16th to endNight
8%4245%36%5%7%9%41%
1320
July1st to 15thNight
8%5%25%6%35%5%8%10%38%
1320
16th to endNight
6%3245%37%6%6%11%42%
1494
August1st to 15thNight
7%425%435%6%6%9%45%
1521
16th to endNight
9%5%25%435%5%5%8%44%
1750
September1st to 15thNight
12%4245%2345%8%46%
1650
16th to endNight
14%6%245%25%446%42%
1785
October1st to 15thNight
16%6%25%423345%46%
1980
16th to endNight
15%414322336%50%
2112
November1st to 15thNight
14%5%34324335%49%
2274
16th to endNight
14%6%25%425%45%6%42%
2415
December1st to 15thNight
16%6%25%42445%6%39%
2520
16th to endNight
17%5%35%32445%6%42%
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
41%5%14%21%13%4
1460
16th to endDay
41%410%24%15%3
1728
February1st to 15thDay
40%5%12%25%14%1
1595
16th to endDay
41%410%26%14%1
1580
March1st to 15thDay
39%5%12%23%16%2
1896
16th to endDay
43%5%8%20%18%2
2173
April1st to 15thDay
37%5%10%24%16%4
2152
16th to endDay
38%5%10%17%22%6%
2112
May1st to 15thDay
38%9%14%22%14%1
2122
16th to endDay
35%9%14%26%13%1
2398
June1st to 15thDay
35%10%14%25%12%1
2310
16th to endDay
31%9%15%23%18%1
2310
July1st to 15thDay
36%8%13%23%15%3
2161
16th to endDay
30%11%17%24%14%2
2204
August1st to 15thDay
36%8%13%25%14%1
2085
16th to endDay
36%8%13%20%16%4
2100
September1st to 15thDay
36%5%14%21%19%2
1980
16th to endDay
44%6%9%17%21%1
1843
October1st to 15thDay
38%6%10%26%15%2
1650
16th to endDay
36%48%28%19%2
1760
November1st to 15thDay
37%5%11%23%18%3
1584
16th to endDay
38%5%11%25%16%3
1545
December1st to 15thDay
40%6%14%23%12%3
1440
16th to endDay
44%411%24%13%1
1536
January1st to 15thNight
41%411%21%16%3
2476
16th to endNight
41%410%25%15%1
2496
February1st to 15thNight
41%411%23%15%2
2267
16th to endNight
39%49%24%19%2
1893
March1st to 15thNight
39%412%25%15%2
2061
16th to endNight
42%5%12%19%18%3
2050
April1st to 15thNight
38%412%19%20%4
1796
16th to endNight
39%5%9%19%19%6%
1760
May1st to 15thNight
42%7%11%20%14%2
1506
16th to endNight
37%9%17%18%14%2
1369
June1st to 15thNight
40%6%14%21%16%1
1320
16th to endNight
35%9%14%22%16%2
1320
July1st to 15thNight
39%11%14%18%12%3
1240
16th to endNight
31%9%18%26%14%1
1390
August1st to 15thNight
33%8%16%22%17%1
1510
16th to endNight
35%7%13%20%19%2
1750
September1st to 15thNight
35%7%10%22%19%3
1650
16th to endNight
40%6%8%19%20%4
1785
October1st to 15thNight
41%410%22%17%3
1980
16th to endNight
35%310%27%20%3
2112
November1st to 15thNight
37%5%9%23%17%7%
2274
16th to endNight
39%6%11%21%16%3
2415
December1st to 15thNight
43%5%12%22%13%2
2520
16th to endNight
42%5%13%22%13%2
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
18%13%43%16%6%1
65
16th to endDay
29%15%38%11%5%
96
February1st to 15thDay
28%15%39%13%2
109
16th to endDay
15%14%45%22%2
239
March1st to 15thDay
19%11%31%29%7%
270
16th to endDay
17%12%38%20%8%3
288
April1st to 15thDay
19%8%29%27%12%2
270
16th to endDay
21%5%24%24%18%5%
254
May1st to 15thDay
28%7%28%17%13%6%
228
16th to endDay
15%222%20%24%13%
267
June1st to 15thDay
14%320%29%21%10%
255
16th to endDay
12%220%29%27%8%
255
July1st to 15thDay
11%215%30%28%13%
245
16th to endDay
5%18%29%38%16%
270
August1st to 15thDay
11%111%25%36%13%
253
16th to endDay
7%15%29%33%22%
268
September1st to 15thDay
12%316%19%27%21%
255
16th to endDay
24%115%26%16%15%
254
October1st to 15thDay
20%421%24%20%9%
255
16th to endDay
16%7%27%29%18%
272
November1st to 15thDay
17%7%26%27%18%3
236
16th to endDay
18%13%30%22%13%2
165
December1st to 15thDay
15%23%25%20%13%3
60
16th to endDay
37%9%34%10%7%
64
January1st to 15thNight
20%14%35%24%5%
720
16th to endNight
20%11%38%26%2
768
February1st to 15thNight
18%12%40%25%1
704
16th to endNight
19%17%37%23%2
631
March1st to 15thNight
19%12%35%26%5%
720
16th to endNight
18%9%39%24%7%1
768
April1st to 15thNight
16%11%40%25%5%
718
16th to endNight
19%7%30%31%11%
704
May1st to 15thNight
17%7%29%32%12%1
516
16th to endNight
12%421%41%19%1
343
June1st to 15thNight
12%122%43%18%
330
16th to endNight
9%116%53%18%1
330
July1st to 15thNight
12%115%43%26%
310
16th to endNight
6%11%44%32%4
440
August1st to 15thNight
9%10%46%31%1
530
16th to endNight
13%210%35%34%4
700
September1st to 15thNight
14%114%37%28%3
660
16th to endNight
18%215%33%26%3
657
October1st to 15thNight
19%5%19%34%18%2
660
16th to endNight
18%8%30%27%14%1
704
November1st to 15thNight
17%7%30%29%13%2
700
16th to endNight
16%13%30%27%10%
720
December1st to 15thNight
20%11%32%23%10%1
720
16th to endNight
19%12%36%26%4
768
Page generated at 2017-04-27 17:48:51. Version ac04

Copyright 2017 A. Danko


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