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 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
40%
15850
20%
48916
12%
15813
49%
15813
25%
30873

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%
778
21%
2683
9%
776
41%
776
20%
1636
January16th to endNight
25%
832
23%
2704
9%
832
42%
832
23%
1691
February1st to 15thNight
21%
763
18%
2460
7%
761
36%
761
21%
1575
February16th to endNight
20%
659
26%
1976
8%
659
42%
659
23%
1243
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%
720
19%
1800
7%
720
44%
720
31%
1194
May1st to 15thNight
38%
562
17%
1642
9%
562
43%
562
24%
1120
May16th to endNight
54%
374
15%
1497
14%
374
59%
374
21%
925
June1st to 15thNight
56%
360
17%
1440
18%
360
63%
360
24%
858
June16th to endNight
59%
360
15%
1440
17%
360
62%
360
24%
841
July1st to 15thNight
59%
340
13%
1360
16%
340
61%
340
19%
866
July16th to endNight
71%
477
16%
1511
15%
447
74%
447
29%
888
August1st to 15thNight
67%
578
17%
1648
13%
575
68%
575
31%
1035
August16th to endNight
64%
764
18%
1910
10%
764
65%
764
34%
1268
September1st to 15thNight
60%
720
24%
1800
15%
720
63%
720
34%
1196
September16th to endNight
56%
717
23%
1947
19%
717
59%
717
29%
1272
October1st to 15thNight
48%
720
21%
2160
20%
720
53%
720
26%
1382
October16th to endNight
40%
768
29%
2304
19%
768
53%
768
33%
1339
November1st to 15thNight
39%
760
22%
2469
14%
760
51%
760
26%
1507
November16th to endNight
36%
780
23%
2616
14%
780
49%
780
23%
1599
December1st to 15thNight
28%
780
17%
2730
8%
780
42%
780
19%
1752
December16th to endNight
26%
832
22%
2912
10%
832
42%
832
20%
1818

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%
49328
Night
14%5%2442445%7%43%
49096
Cloud CoverDay
13%5%2442445%7%43%
49338
Night
14%5%2442445%7%44%
49101
TransparencyDay
37%6%12%23%16%2
49026
Night
39%6%12%22%16%3
48916
SeeingDay
16%6%24%24%18%7%
6236
Night
16%8%28%31%13%1
15854

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%24424446%44%
1582
16th to endDay
17%5%24324346%44%
1872
February1st to 15thDay
16%6%2442345%6%42%
1729
16th to endDay
14%6%34425%446%42%
1644
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%
2160
May1st to 15thDay
15%5%2442446%8%40%
2316
16th to endDay
13%414425%6%6%9%41%
2618
June1st to 15thDay
11%324435%5%7%10%41%
2520
16th to endDay
9%3243245%7%10%46%
2520
July1st to 15thDay
8%4245%35%5%6%10%42%
2520
16th to endDay
5%3245%36%6%8%12%40%
2550
August1st to 15thDay
10%5%245%345%6%9%41%
2289
16th to endDay
8%4146%35%6%7%7%44%
2292
September1st to 15thDay
12%42443445%7%46%
2160
16th to endDay
15%7%25%4345%46%40%
2010
October1st to 15thDay
17%5%23333445%45%
1800
16th to endDay
14%424323345%51%
1920
November1st to 15thDay
16%5%233245%46%45%
1719
16th to endDay
14%5%15%42345%5%47%
1673
December1st to 15thDay
15%5%24424446%43%
1560
16th to endDay
17%6%35%42335%5%41%
1664
January1st to 15thNight
16%5%24424447%42%
2683
16th to endNight
17%6%24324345%44%
2704
February1st to 15thNight
15%6%25%43445%5%42%
2459
16th to endNight
16%5%14424336%46%
1976
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%
1800
May1st to 15thNight
15%7%25%5%245%5%7%39%
1642
16th to endNight
11%6%34435%45%9%42%
1495
June1st to 15thNight
10%424435%5%49%44%
1440
16th to endNight
8%425%5%35%6%8%8%41%
1440
July1st to 15thNight
7%5%26%6%36%7%6%10%37%
1440
16th to endNight
6%315%5%36%6%7%11%41%
1615
August1st to 15thNight
7%425%5%35%5%6%9%43%
1659
16th to endNight
9%426%5%245%6%8%44%
1910
September1st to 15thNight
12%5%15%42345%7%47%
1800
16th to endNight
13%5%245%34446%44%
1947
October1st to 15thNight
16%6%25%423245%45%
2160
16th to endNight
15%413322345%52%
2304
November1st to 15thNight
14%5%24424345%48%
2469
16th to endNight
13%5%1443445%6%44%
2616
December1st to 15thNight
17%6%25%4245%5%6%38%
2730
16th to endNight
16%5%24434446%42%
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%34424445%44%
1582
16th to endDay
17%6%24324445%44%
1872
February1st to 15thDay
16%6%2442445%6%42%
1729
16th to endDay
13%6%44434445%42%
1644
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
14%5%24324346%47%
2160
May1st to 15thDay
15%5%3432446%9%40%
2316
16th to endDay
13%4144245%6%9%41%
2618
June1st to 15thDay
11%4235%25%6%7%10%42%
2520
16th to endDay
9%324425%6%7%11%45%
2520
July1st to 15thDay
8%4245%35%6%6%9%42%
2520
16th to endDay
5%3245%36%5%9%11%40%
2550
August1st to 15thDay
10%5%25%5%345%7%9%41%
2289
16th to endDay
8%415%5%46%5%6%8%43%
2292
September1st to 15thDay
11%5%24435%45%7%45%
2160
16th to endDay
15%7%25%42445%6%40%
2010
October1st to 15thDay
17%5%24424445%45%
1800
16th to endDay
14%324332346%51%
1920
November1st to 15thDay
16%5%143245%46%45%
1719
16th to endDay
14%5%1442335%5%47%
1673
December1st to 15thDay
15%5%24414446%43%
1560
16th to endDay
18%6%34423346%41%
1664
January1st to 15thNight
16%5%24424446%43%
2683
16th to endNight
17%6%24424346%44%
2704
February1st to 15thNight
15%6%25%425%45%6%42%
2452
16th to endNight
15%5%23424436%46%
1976
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%7%45%
1800
May1st to 15thNight
14%7%35%4345%5%7%39%
1642
16th to endNight
11%6%25%5%25%45%9%41%
1495
June1st to 15thNight
11%5%145%26%45%8%43%
1440
16th to endNight
7%425%5%36%5%7%9%40%
1440
July1st to 15thNight
8%5%25%6%35%6%7%9%38%
1440
16th to endNight
6%3245%37%6%6%11%41%
1615
August1st to 15thNight
7%426%435%6%6%9%44%
1659
16th to endNight
9%425%435%5%5%8%44%
1910
September1st to 15thNight
12%5%245%2345%8%46%
1800
16th to endNight
13%6%245%25%446%44%
1947
October1st to 15thNight
16%6%25%423345%45%
2160
16th to endNight
15%413322335%52%
2304
November1st to 15thNight
14%5%34324345%48%
2469
16th to endNight
13%5%2442445%6%44%
2616
December1st to 15thNight
16%6%25%5%2445%6%38%
2730
16th to endNight
16%5%35%42445%6%42%
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
40%5%14%21%14%4
1583
16th to endDay
40%5%11%23%15%3
1872
February1st to 15thDay
41%5%12%24%14%2
1732
16th to endDay
41%410%26%14%1
1644
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
37%5%10%18%21%6%
2160
May1st to 15thDay
38%8%13%21%15%2
2316
16th to endDay
36%9%14%25%12%1
2622
June1st to 15thDay
34%10%14%25%13%1
2520
16th to endDay
31%9%15%22%18%1
2520
July1st to 15thDay
36%8%14%23%14%3
2371
16th to endDay
30%11%16%23%15%2
2391
August1st to 15thDay
37%8%13%24%14%1
2276
16th to endDay
35%8%13%21%16%4
2292
September1st to 15thDay
36%5%13%22%19%2
2160
16th to endDay
43%6%9%18%21%1
2010
October1st to 15thDay
39%6%10%24%16%2
1800
16th to endDay
35%48%28%20%2
1920
November1st to 15thDay
38%412%23%17%3
1719
16th to endDay
36%410%27%17%3
1673
December1st to 15thDay
40%6%13%24%11%2
1560
16th to endDay
44%412%24%13%1
1664
January1st to 15thNight
40%411%21%17%3
2683
16th to endNight
41%410%25%16%1
2704
February1st to 15thNight
42%5%11%23%15%2
2460
16th to endNight
39%410%24%19%2
1976
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
38%5%10%19%19%6%
1800
May1st to 15thNight
43%7%11%20%15%2
1642
16th to endNight
38%9%16%18%14%2
1497
June1st to 15thNight
38%6%14%22%16%1
1440
16th to endNight
34%9%15%22%16%2
1440
July1st to 15thNight
39%11%15%17%12%3
1360
16th to endNight
31%9%18%25%14%1
1511
August1st to 15thNight
34%8%16%21%17%1
1648
16th to endNight
35%7%13%20%19%2
1910
September1st to 15thNight
36%7%10%23%19%3
1800
16th to endNight
39%6%9%20%20%4
1947
October1st to 15thNight
41%410%21%18%3
2160
16th to endNight
34%310%28%20%3
2304
November1st to 15thNight
38%5%9%23%16%6%
2469
16th to endNight
38%6%10%22%18%3
2616
December1st to 15thNight
44%5%12%23%12%2
2730
16th to endNight
42%5%12%23%13%2
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
17%15%41%14%10%1
98
16th to endDay
27%13%36%15%6%
144
February1st to 15thDay
28%15%42%11%1
156
16th to endDay
17%13%45%21%1
265
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
20%5%25%25%18%4
270
May1st to 15thDay
26%10%31%15%11%4
288
16th to endDay
18%222%22%22%11%
331
June1st to 15thDay
13%222%28%21%11%
315
16th to endDay
10%224%31%23%7%
315
July1st to 15thDay
10%117%33%25%10%
305
16th to endDay
7%19%30%36%15%
326
August1st to 15thDay
13%112%26%33%13%
313
16th to endDay
7%8%31%31%19%
332
September1st to 15thDay
12%320%20%23%18%
315
16th to endDay
21%216%26%16%15%
314
October1st to 15thDay
21%320%24%21%9%
315
16th to endDay
16%7%27%26%19%2
336
November1st to 15thDay
18%7%25%29%16%2
281
16th to endDay
16%14%33%21%11%2
203
December1st to 15thDay
18%21%25%18%12%3
90
16th to endDay
32%8%38%14%6%
96
January1st to 15thNight
19%14%36%23%5%
780
16th to endNight
20%11%38%26%2
832
February1st to 15thNight
19%12%41%25%1
764
16th to endNight
18%17%37%23%2
659
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
18%7%30%31%11%
720
May1st to 15thNight
18%8%29%31%11%1
562
16th to endNight
13%421%40%18%1
375
June1st to 15thNight
11%122%44%19%
360
16th to endNight
8%118%53%17%1
360
July1st to 15thNight
11%116%43%26%
340
16th to endNight
6%11%45%31%4
477
August1st to 15thNight
9%10%46%31%1
578
16th to endNight
12%210%35%34%3
764
September1st to 15thNight
14%116%37%26%2
720
16th to endNight
17%215%33%26%4
717
October1st to 15thNight
19%5%18%33%19%3
720
16th to endNight
18%7%30%27%15%1
768
November1st to 15thNight
17%6%30%30%13%2
760
16th to endNight
15%13%30%28%10%
780
December1st to 15thNight
20%11%32%23%10%1
780
16th to endNight
19%11%37%27%3
832
Page generated at 2018-02-23 11:21:40. Version ac04

Copyright 2018 A. Danko


Tuckahoe State Park Clear Sky Chart |Charts Home