Fishkill
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fishkill clear sky chart from 2005-11-06 to 2024-01-12.

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
31%
23022
18%
74639
9%
22979
41%
22979
20%
48698

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 10thNight
18%
760
21%
2649
7%
757
36%
757
20%
1624
January11th to 20thNight
22%
727
16%
2541
6%
727
34%
727
15%
1719
January21st to endNight
20%
792
21%
2668
7%
792
38%
792
20%
1635
February1st to 10thNight
17%
720
15%
2340
4%
720
31%
720
16%
1581
February11th to 20thNight
14%
703
18%
2100
4%
700
30%
700
17%
1430
February21st to endNight
17%
592
23%
1776
8%
592
36%
592
18%
1183
March1st to 10thNight
21%
720
19%
2160
7%
720
35%
720
20%
1395
March11th to 20thNight
20%
720
19%
2075
6%
720
33%
720
18%
1401
March21st to endNight
20%
792
21%
1991
5%
792
32%
792
21%
1390
April1st to 10thNight
20%
720
17%
1800
3%
720
28%
720
18%
1305
April11th to 20thNight
26%
711
16%
1775
5%
711
32%
711
23%
1268
April21st to endNight
23%
671
18%
1751
5%
671
31%
671
21%
1231
May1st to 10thNight
22%
540
13%
1620
6%
540
29%
540
16%
1164
May11th to 20thNight
26%
369
20%
1431
12%
369
39%
369
17%
921
May21st to endNight
47%
388
14%
1551
14%
388
53%
388
19%
950
June1st to 10thNight
40%
360
16%
1440
14%
360
51%
360
18%
904
June11th to 20thNight
43%
360
12%
1440
13%
360
51%
360
20%
887
June21st to endNight
52%
360
14%
1440
17%
360
59%
360
25%
845
July1st to 10thNight
54%
350
14%
1400
17%
350
59%
350
21%
856
July11th to 20thNight
52%
348
13%
1392
16%
348
55%
348
22%
840
July21st to endNight
57%
394
16%
1486
19%
372
62%
372
25%
877
August1st to 10thNight
56%
422
16%
1486
15%
420
60%
420
25%
901
August11th to 20thNight
53%
710
13%
1774
7%
710
55%
710
26%
1285
August21st to endNight
54%
792
18%
1980
8%
792
57%
792
31%
1337
September1st to 10thNight
43%
720
20%
1800
9%
720
48%
720
30%
1232
September11th to 20thNight
47%
720
26%
1880
16%
720
52%
720
36%
1147
September21st to endNight
44%
720
24%
1980
16%
720
51%
720
30%
1275
October1st to 10thNight
35%
720
16%
2073
11%
720
42%
720
21%
1419
October11th to 20thNight
36%
720
21%
2160
12%
720
47%
720
26%
1366
October21st to endNight
27%
792
17%
2538
10%
792
37%
792
19%
1742
November1st to 10thNight
33%
740
23%
2407
12%
740
48%
740
25%
1458
November11th to 20thNight
27%
760
24%
2470
12%
760
43%
760
21%
1555
November21st to endNight
28%
760
21%
2567
10%
760
42%
760
21%
1578
December1st to 10thNight
22%
760
18%
2660
7%
760
36%
760
15%
1766
December11th to 20thNight
21%
760
15%
3211
4%
759
34%
759
13%
2069
December21st to endNight
18%
829
12%
4827
6%
817
34%
817
9%
3162

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%35%5%35%5%5%7%39%
74760
Night
17%7%35%5%3445%7%40%
74944
TransparencyDay
43%7%13%21%14%2
74465
Night
42%7%13%22%14%2
74773
SeeingDay
22%16%29%21%10%3
13808
Night
20%13%31%27%8%1
23030

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 10thDay
13%7%26%5%45%5%6%7%40%
1517
11th to 20thDay
15%8%37%6%46%5%6%6%34%
1448
21st to endDay
13%7%36%5%45%5%6%7%40%
1685
February1st to 10thDay
18%7%37%6%45%45%7%33%
1620
11th to 20thDay
15%7%35%6%35%45%7%39%
1748
21st to endDay
20%8%46%5%24447%36%
1480
March1st to 10thDay
14%7%37%6%35%46%6%40%
1797
11th to 20thDay
15%7%36%6%46%5%5%7%37%
1882
21st to endDay
20%8%36%5%345%45%38%
2363
April1st to 10thDay
18%8%45%5%35%446%38%
2160
11th to 20thDay
17%5%25%5%3445%7%41%
2134
21st to endDay
21%5%25%5%25%6%5%5%39%
2207
May1st to 10thDay
22%6%36%5%3445%7%35%
2340
11th to 20thDay
18%7%35%5%35%5%5%7%38%
2478
21st to endDay
14%6%25%5%35%5%6%9%41%
2725
June1st to 10thDay
18%5%245%35%5%7%9%37%
2520
11th to 20thDay
15%6%35%6%36%5%6%9%36%
2520
21st to endDay
13%5%36%6%45%5%6%10%38%
2520
July1st to 10thDay
12%5%25%6%46%6%6%8%40%
2520
11th to 20thDay
11%435%6%45%6%6%10%40%
2520
21st to endDay
12%5%25%6%47%6%6%9%39%
2744
August1st to 10thDay
11%5%35%6%45%6%7%9%38%
2420
11th to 20thDay
12%5%35%5%46%5%6%9%39%
2126
21st to endDay
13%5%35%5%35%5%6%8%42%
2376
September1st to 10thDay
15%5%25%5%45%45%7%42%
2160
11th to 20thDay
13%425%5%3445%6%49%
2079
21st to endDay
17%5%25%5%25%45%7%43%
1980
October1st to 10thDay
20%7%35%424446%41%
1885
11th to 20thDay
15%5%25%436%5%5%8%43%
1800
21st to endDay
22%7%25%5%35%45%6%35%
1816
November1st to 10thDay
14%6%245%34336%50%
1671
11th to 20thDay
17%6%245%2445%8%42%
1710
21st to endDay
17%6%36%435%35%7%42%
1611
December1st to 10thDay
18%7%47%6%445%47%34%
1520
11th to 20thDay
21%7%24424446%41%
1906
21st to endDay
19%10%5%7%7%35%5%5%6%29%
2772
January1st to 10thNight
15%7%35%5%25%5%5%7%42%
2649
11th to 20thNight
17%8%36%5%35%5%5%7%36%
2541
21st to endNight
12%9%36%5%3446%8%41%
2668
February1st to 10thNight
15%11%46%5%45%346%37%
2340
11th to 20thNight
16%7%47%5%35%5%6%5%37%
2098
21st to endNight
18%6%37%6%345%46%39%
1776
March1st to 10thNight
16%7%25%5%345%6%7%41%
2150
11th to 20thNight
17%7%35%6%3345%7%38%
2074
21st to endNight
18%7%35%4345%5%6%40%
1991
April1st to 10thNight
18%8%37%5%45%5%46%35%
1800
11th to 20thNight
19%7%35%5%3445%6%39%
1775
21st to endNight
21%6%35%5%2446%5%39%
1751
May1st to 10thNight
22%8%36%6%35%45%6%33%
1620
11th to 20thNight
17%7%35%5%35%46%7%38%
1430
21st to endNight
14%5%25%5%35%5%6%9%42%
1550
June1st to 10thNight
17%435%5%35%45%9%40%
1440
11th to 20thNight
15%6%35%5%25%5%6%9%39%
1440
21st to endNight
11%4245%35%5%8%10%43%
1440
July1st to 10thNight
13%5%25%5%35%47%8%42%
1440
11th to 20thNight
13%5%26%5%35%6%6%9%41%
1440
21st to endNight
10%6%34336%5%7%10%43%
1574
August1st to 10thNight
9%5%27%5%35%5%6%9%44%
1496
11th to 20thNight
12%6%27%6%45%7%7%7%37%
1774
21st to endNight
15%5%25%435%5%5%7%45%
1980
September1st to 10thNight
16%6%25%5%3345%6%44%
1800
11th to 20thNight
13%5%25%323446%53%
1880
21st to endNight
16%5%35%42345%6%46%
1980
October1st to 10thNight
20%7%36%5%24445%42%
2073
11th to 20thNight
15%5%25%5%3435%7%45%
2160
21st to endNight
23%6%36%5%34446%38%
2538
November1st to 10thNight
13%6%35%42445%7%46%
2407
11th to 20thNight
18%7%35%434446%44%
2470
21st to endNight
15%6%25%5%335%5%7%43%
2567
December1st to 10thNight
21%8%35%42445%7%37%
2660
11th to 20thNight
19%8%35%5%35%5%5%6%36%
3288
21st to endNight
23%9%36%5%34446%33%
4884

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 10thDay
41%6%13%26%11%3
1518
11th to 20thDay
48%7%13%19%11%2
1448
21st to endDay
41%7%13%24%13%2
1685
February1st to 10thDay
50%5%14%19%11%1
1620
11th to 20thDay
45%5%11%22%14%2
1757
21st to endDay
49%5%11%21%12%2
1480
March1st to 10thDay
44%6%14%21%13%3
1800
11th to 20thDay
45%7%11%22%14%1
1882
21st to endDay
48%5%9%16%17%5%
2363
April1st to 10thDay
46%6%11%21%12%4
2160
11th to 20thDay
42%6%12%21%16%2
2134
21st to endDay
45%7%11%20%14%4
2207
May1st to 10thDay
49%6%11%19%14%2
2340
11th to 20thDay
44%7%11%20%15%2
2482
21st to endDay
40%9%16%20%13%2
2725
June1st to 10thDay
43%9%15%20%13%1
2520
11th to 20thDay
44%9%14%22%10%1
2520
21st to endDay
41%9%12%24%12%1
2520
July1st to 10thDay
40%10%13%19%16%2
2450
11th to 20thDay
36%9%16%23%14%1
2445
21st to endDay
40%9%14%19%16%2
2591
August1st to 10thDay
39%10%15%24%12%1
2406
11th to 20thDay
38%10%17%22%11%
2126
21st to endDay
37%8%13%24%16%2
2376
September1st to 10thDay
40%8%12%22%16%2
2160
11th to 20thDay
35%7%10%24%23%2
2079
21st to endDay
41%7%11%22%16%3
1980
October1st to 10thDay
45%6%9%22%14%3
1885
11th to 20thDay
38%8%14%26%14%1
1800
21st to endDay
47%6%12%20%13%2
1816
November1st to 10thDay
37%5%13%26%16%3
1671
11th to 20thDay
40%6%12%23%17%3
1710
21st to endDay
42%6%14%27%10%2
1611
December1st to 10thDay
50%5%15%18%11%1
1520
11th to 20thDay
43%5%17%22%12%2
1906
21st to endDay
53%9%11%19%7%
2772
January1st to 10thNight
40%6%14%23%14%3
2649
11th to 20thNight
47%7%15%21%8%2
2541
21st to endNight
40%5%13%23%17%3
2668
February1st to 10thNight
48%5%14%20%11%2
2340
11th to 20thNight
45%7%11%19%15%3
2100
21st to endNight
45%5%9%23%14%3
1776
March1st to 10thNight
40%6%15%22%14%3
2160
11th to 20thNight
45%5%11%21%15%3
2075
21st to endNight
43%7%10%17%18%5%
1991
April1st to 10thNight
47%7%10%20%13%2
1800
11th to 20thNight
44%8%10%18%19%1
1775
21st to endNight
46%6%9%21%14%4
1751
May1st to 10thNight
50%8%10%16%13%2
1620
11th to 20thNight
45%7%10%19%17%2
1431
21st to endNight
39%9%17%21%11%2
1551
June1st to 10thNight
41%9%11%21%16%2
1440
11th to 20thNight
40%9%18%23%10%1
1440
21st to endNight
33%10%16%25%14%1
1440
July1st to 10thNight
38%10%14%22%14%3
1400
11th to 20thNight
37%9%16%26%10%1
1392
21st to endNight
34%10%19%19%15%3
1486
August1st to 10thNight
35%10%16%24%14%1
1486
11th to 20thNight
43%10%16%20%11%1
1774
21st to endNight
37%9%12%22%19%1
1980
September1st to 10thNight
40%7%11%26%15%1
1800
11th to 20thNight
32%6%12%24%24%2
1880
21st to endNight
37%7%10%22%23%1
1980
October1st to 10thNight
44%8%10%21%14%2
2073
11th to 20thNight
39%7%13%28%13%1
2160
21st to endNight
47%7%11%21%12%1
2538
November1st to 10thNight
37%6%12%22%19%3
2407
11th to 20thNight
42%5%11%23%17%3
2470
21st to endNight
39%6%15%29%10%1
2567
December1st to 10thNight
47%6%12%22%12%1
2660
11th to 20thNight
45%7%15%18%13%2
3288
21st to endNight
50%7%14%19%10%
4884

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 10thDay
26%25%27%18%4
180
11th to 20thDay
31%27%27%13%3
162
21st to endDay
20%27%36%13%22
222
February1st to 10thDay
37%23%27%11%2
240
11th to 20thDay
27%25%34%13%
416
21st to endDay
30%23%33%12%2
346
March1st to 10thDay
27%20%34%16%4
420
11th to 20thDay
25%25%30%15%31
420
21st to endDay
30%20%31%13%42
462
April1st to 10thDay
30%20%28%13%7%1
420
11th to 20thDay
24%25%28%15%8%1
412
21st to endDay
32%18%27%17%5%1
420
May1st to 10thDay
32%18%29%13%7%1
423
11th to 20thDay
21%16%36%18%7%1
447
21st to endDay
18%13%26%26%14%3
485
June1st to 10thDay
20%11%32%23%13%2
450
11th to 20thDay
17%13%31%25%13%2
450
21st to endDay
15%13%28%28%13%3
450
July1st to 10thDay
14%9%29%27%16%5%
445
11th to 20thDay
12%7%27%33%17%4
444
21st to endDay
13%8%30%33%15%2
488
August1st to 10thDay
13%9%24%33%17%5%
446
11th to 20thDay
13%8%27%30%17%5%
439
21st to endDay
12%9%27%29%16%7%
495
September1st to 10thDay
19%12%22%25%15%7%
450
11th to 20thDay
15%9%31%21%14%10%
450
21st to endDay
20%11%28%24%11%6%
450
October1st to 10thDay
29%8%26%20%14%4
450
11th to 20thDay
18%16%30%25%10%2
450
21st to endDay
28%14%30%19%9%
412
November1st to 10thDay
19%15%27%26%10%2
365
11th to 20thDay
26%19%29%19%6%1
370
21st to endDay
22%20%30%22%5%1
271
December1st to 10thDay
22%24%35%13%5%
180
11th to 20thDay
34%21%32%13%1
180
21st to endDay
24%24%30%16%6%
198
January1st to 10thNight
21%17%41%19%3
760
11th to 20thNight
24%17%32%24%2
727
21st to endNight
18%19%38%22%3
792
February1st to 10thNight
23%18%37%21%1
720
11th to 20thNight
23%19%41%16%1
703
21st to endNight
25%18%36%18%2
592
March1st to 10thNight
23%21%33%21%3
720
11th to 20thNight
22%21%35%19%4
720
21st to endNight
23%18%35%18%5%
792
April1st to 10thNight
23%21%33%19%4
720
11th to 20thNight
23%15%32%25%5%
711
21st to endNight
24%16%34%20%6%
671
May1st to 10thNight
24%16%32%22%6%
540
11th to 20thNight
21%12%37%24%5%
369
21st to endNight
17%6%25%40%10%1
389
June1st to 10thNight
17%5%32%33%13%
360
11th to 20thNight
15%7%29%33%16%1
360
21st to endNight
12%425%46%13%
360
July1st to 10thNight
15%421%41%19%1
350
11th to 20thNight
12%5%23%42%17%1
348
21st to endNight
13%420%44%18%1
394
August1st to 10thNight
11%223%46%17%1
422
11th to 20thNight
15%419%39%22%2
710
21st to endNight
16%5%18%37%21%2
792
September1st to 10thNight
18%5%26%35%14%2
720
11th to 20thNight
16%5%26%31%18%4
720
21st to endNight
18%7%26%32%15%2
720
October1st to 10thNight
23%10%27%25%14%1
720
11th to 20thNight
19%10%31%31%8%1
720
21st to endNight
27%11%31%24%6%
792
November1st to 10thNight
17%11%33%28%10%1
740
11th to 20thNight
22%16%32%23%7%1
760
21st to endNight
19%16%33%25%7%
760
December1st to 10thNight
26%17%31%20%5%
760
11th to 20thNight
24%16%33%24%3
760
21st to endNight
25%16%36%20%2
836
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