Memorial Field of Flushing
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Memorial Field of Flushing 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
33%
23128
19%
74595
10%
23085
44%
23085
22%
47751

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
19%
760
23%
2649
8%
757
38%
757
21%
1585
January11th to 20thNight
23%
728
18%
2546
7%
728
38%
728
17%
1645
January21st to endNight
19%
792
23%
2646
8%
792
38%
792
21%
1616
February1st to 10thNight
20%
720
17%
2314
6%
720
34%
720
19%
1521
February11th to 20thNight
16%
703
20%
2100
4%
700
34%
700
18%
1410
February21st to endNight
19%
592
25%
1776
9%
592
38%
592
21%
1152
March1st to 10thNight
23%
720
22%
2160
9%
720
41%
720
25%
1355
March11th to 20thNight
22%
720
20%
2079
8%
720
35%
720
23%
1358
March21st to endNight
24%
792
22%
1990
7%
792
34%
792
25%
1382
April1st to 10thNight
23%
720
19%
1800
5%
720
31%
720
23%
1271
April11th to 20thNight
30%
711
18%
1775
5%
711
36%
711
27%
1246
April21st to endNight
29%
686
19%
1766
7%
686
37%
686
24%
1213
May1st to 10thNight
25%
540
15%
1620
7%
540
33%
540
18%
1137
May11th to 20thNight
27%
408
18%
1470
10%
408
38%
408
17%
975
May21st to endNight
50%
388
15%
1551
15%
388
55%
388
19%
966
June1st to 10thNight
43%
360
17%
1440
16%
360
52%
360
19%
902
June11th to 20thNight
50%
360
15%
1440
16%
360
58%
360
21%
884
June21st to endNight
57%
360
16%
1440
19%
360
63%
360
24%
838
July1st to 10thNight
53%
350
13%
1400
15%
350
57%
350
19%
867
July11th to 20thNight
56%
348
15%
1392
20%
348
60%
348
21%
839
July21st to endNight
55%
394
18%
1486
18%
372
62%
372
25%
861
August1st to 10thNight
56%
473
16%
1537
12%
471
60%
471
27%
946
August11th to 20thNight
54%
710
15%
1774
9%
710
55%
710
27%
1246
August21st to endNight
55%
792
18%
1980
9%
792
58%
792
31%
1343
September1st to 10thNight
47%
720
20%
1800
11%
720
51%
720
28%
1255
September11th to 20thNight
48%
720
25%
1887
15%
720
54%
720
37%
1165
September21st to endNight
44%
720
24%
1980
15%
720
51%
720
28%
1298
October1st to 10thNight
38%
720
16%
2059
11%
720
43%
720
23%
1397
October11th to 20thNight
38%
720
23%
2160
14%
720
50%
720
28%
1306
October21st to endNight
26%
792
20%
2528
10%
792
39%
792
22%
1654
November1st to 10thNight
35%
740
24%
2407
13%
740
51%
740
27%
1417
November11th to 20thNight
28%
760
26%
2470
13%
760
45%
760
23%
1511
November21st to endNight
28%
760
23%
2524
10%
760
44%
760
24%
1502
December1st to 10thNight
22%
760
19%
2660
7%
760
36%
760
17%
1707
December11th to 20thNight
23%
760
19%
3181
6%
759
38%
759
15%
1954
December21st to endNight
21%
829
13%
4808
7%
817
38%
817
11%
3027

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%6%8%41%
74766
Night
17%6%35%5%3445%7%42%
74949
TransparencyDay
41%7%13%22%16%2
74471
Night
42%6%12%22%16%3
74778
SeeingDay
19%12%31%24%11%3
13891
Night
20%10%32%28%10%1
23136

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
14%7%245%35%46%7%44%
1517
11th to 20thDay
16%8%35%5%3446%7%38%
1454
21st to endDay
14%7%35%5%245%5%7%42%
1708
February1st to 10thDay
18%8%45%5%245%5%7%37%
1644
11th to 20thDay
15%6%36%5%34446%44%
1748
21st to endDay
22%7%25%425%45%6%39%
1480
March1st to 10thDay
14%6%36%5%2445%7%45%
1797
11th to 20thDay
16%6%35%5%36%5%6%8%39%
1880
21st to endDay
20%7%35%43445%6%39%
2366
April1st to 10thDay
18%8%4442445%7%41%
2160
11th to 20thDay
17%5%25%44445%8%42%
2134
21st to endDay
19%6%245%35%46%7%40%
2192
May1st to 10thDay
23%6%345%3445%7%35%
2340
11th to 20thDay
20%6%25%435%5%6%9%36%
2437
21st to endDay
17%5%2442446%9%42%
2725
June1st to 10thDay
16%6%345%35%5%6%9%37%
2520
11th to 20thDay
16%6%36%5%35%5%5%9%37%
2520
21st to endDay
11%6%25%6%35%5%6%10%42%
2520
July1st to 10thDay
10%5%26%6%37%7%5%9%39%
2520
11th to 20thDay
10%5%245%35%6%8%10%42%
2520
21st to endDay
12%5%35%6%36%6%7%8%38%
2744
August1st to 10thDay
9%5%26%5%36%6%8%10%39%
2370
11th to 20thDay
11%5%26%5%46%5%6%8%41%
2126
21st to endDay
12%6%25%5%35%5%6%8%42%
2376
September1st to 10thDay
14%5%25%5%35%45%8%44%
2160
11th to 20thDay
12%5%3342445%8%50%
2071
21st to endDay
18%5%25%5%3446%6%42%
1980
October1st to 10thDay
21%6%2442345%6%42%
1899
11th to 20thDay
16%5%2443445%7%46%
1800
21st to endDay
21%5%25%42445%6%42%
1826
November1st to 10thDay
14%6%25%413345%51%
1671
11th to 20thDay
17%5%25%324446%48%
1710
21st to endDay
15%6%244345%5%7%45%
1653
December1st to 10thDay
19%7%25%5%35%447%39%
1520
11th to 20thDay
22%6%24313345%46%
1906
21st to endDay
18%9%36%7%35%5%5%7%32%
2772
January1st to 10thNight
17%6%34433445%47%
2649
11th to 20thNight
20%7%244345%5%7%39%
2546
21st to endNight
14%8%25%4245%47%45%
2646
February1st to 10thNight
18%8%35%6%34446%40%
2314
11th to 20thNight
18%7%36%434445%41%
2098
21st to endNight
21%6%345%23445%43%
1776
March1st to 10thNight
16%7%3442335%7%45%
2150
11th to 20thNight
17%7%35%5%25%45%6%41%
2078
21st to endNight
18%7%35%5%24446%41%
1990
April1st to 10thNight
19%6%37%5%25%5%5%7%38%
1800
11th to 20thNight
18%7%35%4345%5%7%40%
1775
21st to endNight
20%5%35%4245%46%42%
1766
May1st to 10thNight
21%9%37%5%24446%35%
1620
11th to 20thNight
20%6%45%5%2445%6%38%
1469
21st to endNight
17%7%35%5%4445%7%40%
1550
June1st to 10thNight
18%7%2344446%8%40%
1440
11th to 20thNight
13%6%35%4445%6%9%39%
1440
21st to endNight
10%5%25%5%46%47%10%42%
1440
July1st to 10thNight
12%5%36%6%45%6%6%9%39%
1440
11th to 20thNight
11%5%35%5%45%7%6%9%40%
1440
21st to endNight
11%5%25%5%35%6%6%9%42%
1574
August1st to 10thNight
9%5%25%6%35%7%6%9%43%
1547
11th to 20thNight
12%7%27%6%36%5%7%8%37%
1774
21st to endNight
13%5%35%5%35%6%5%7%44%
1980
September1st to 10thNight
14%5%26%6%35%5%47%42%
1800
11th to 20thNight
14%5%34422347%52%
1887
21st to endNight
17%5%35%42435%7%44%
1980
October1st to 10thNight
20%5%35%5%23446%41%
2059
11th to 20thNight
16%5%25%43435%7%49%
2160
21st to endNight
21%8%25%5%23346%42%
2528
November1st to 10thNight
13%5%245%34446%50%
2407
11th to 20thNight
20%5%25%323345%48%
2470
21st to endNight
15%5%344345%5%6%47%
2524
December1st to 10thNight
21%6%35%5%2346%6%40%
2660
11th to 20thNight
20%6%3443445%6%43%
3288
21st to endNight
20%9%26%435%446%37%
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
40%412%27%14%4
1518
11th to 20thDay
45%5%15%20%13%3
1454
21st to endDay
41%5%12%25%14%3
1708
February1st to 10thDay
46%5%13%22%12%2
1644
11th to 20thDay
42%410%25%16%3
1757
21st to endDay
47%411%21%15%3
1480
March1st to 10thDay
39%6%13%25%15%3
1800
11th to 20thDay
41%6%14%23%15%2
1880
21st to endDay
46%5%8%18%17%5%
2366
April1st to 10thDay
43%5%12%20%16%4
2160
11th to 20thDay
40%5%12%22%17%3
2134
21st to endDay
42%6%12%20%16%4
2192
May1st to 10thDay
47%6%10%20%15%2
2340
11th to 20thDay
42%8%12%20%15%3
2441
21st to endDay
39%7%17%22%14%2
2725
June1st to 10thDay
40%9%14%21%14%2
2520
11th to 20thDay
43%8%12%23%12%2
2520
21st to endDay
37%9%16%22%15%1
2520
July1st to 10thDay
40%9%14%21%16%1
2450
11th to 20thDay
34%8%17%25%14%2
2445
21st to endDay
40%9%14%18%16%3
2591
August1st to 10thDay
36%10%16%24%13%1
2356
11th to 20thDay
38%9%14%23%14%1
2126
21st to endDay
37%8%12%22%19%3
2376
September1st to 10thDay
38%7%13%22%17%3
2160
11th to 20thDay
32%6%13%23%24%2
2071
21st to endDay
42%6%10%18%20%3
1980
October1st to 10thDay
43%6%11%22%16%2
1899
11th to 20thDay
37%6%12%25%18%2
1800
21st to endDay
43%5%10%22%17%2
1826
November1st to 10thDay
36%413%23%22%3
1671
11th to 20thDay
39%410%23%21%3
1710
21st to endDay
38%5%14%30%11%2
1653
December1st to 10thDay
45%5%15%19%14%1
1520
11th to 20thDay
41%415%23%15%2
1906
21st to endDay
49%8%11%23%8%
2772
January1st to 10thNight
40%412%23%17%4
2649
11th to 20thNight
44%6%14%23%10%2
2546
21st to endNight
39%5%10%24%20%3
2646
February1st to 10thNight
46%5%13%23%12%2
2314
11th to 20thNight
46%5%9%19%16%5%
2100
21st to endNight
43%49%24%16%3
1776
March1st to 10thNight
39%412%24%15%5%
2160
11th to 20thNight
42%5%12%21%16%4
2079
21st to endNight
44%6%9%17%18%6%
1990
April1st to 10thNight
45%6%10%19%17%4
1800
11th to 20thNight
43%6%10%19%20%2
1775
21st to endNight
43%6%10%20%17%4
1766
May1st to 10thNight
50%5%10%18%14%2
1620
11th to 20thNight
46%7%10%16%18%3
1470
21st to endNight
44%6%16%20%12%2
1551
June1st to 10thNight
42%8%9%20%19%1
1440
11th to 20thNight
40%8%14%26%11%1
1440
21st to endNight
35%9%15%25%15%1
1440
July1st to 10thNight
41%9%14%20%14%2
1400
11th to 20thNight
38%9%13%26%13%1
1392
21st to endNight
34%9%17%22%15%3
1486
August1st to 10thNight
35%10%17%22%15%1
1537
11th to 20thNight
41%9%14%24%10%1
1774
21st to endNight
38%8%13%21%18%2
1980
September1st to 10thNight
41%9%10%22%17%2
1800
11th to 20thNight
33%5%12%24%23%3
1887
21st to endNight
40%6%9%21%21%2
1980
October1st to 10thNight
45%6%11%21%14%3
2059
11th to 20thNight
36%5%13%28%16%2
2160
21st to endNight
45%411%22%17%1
2528
November1st to 10thNight
36%412%23%21%4
2407
11th to 20thNight
40%49%24%19%4
2470
21st to endNight
37%5%13%28%15%2
2524
December1st to 10thNight
45%5%13%22%14%2
2660
11th to 20thNight
43%5%13%19%17%3
3288
21st to endNight
46%7%12%23%11%1
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
19%27%32%16%5%1
180
11th to 20thDay
17%30%35%15%4
164
21st to endDay
18%22%41%13%5%2
232
February1st to 10thDay
30%19%34%16%2
264
11th to 20thDay
23%18%40%17%2
416
21st to endDay
26%18%34%18%3
346
March1st to 10thDay
20%22%35%20%4
420
11th to 20thDay
18%19%41%16%5%1
420
21st to endDay
25%20%33%16%6%1
462
April1st to 10thDay
22%19%36%14%8%1
420
11th to 20thDay
21%15%35%18%9%1
412
21st to endDay
26%15%35%18%41
420
May1st to 10thDay
28%15%32%18%5%2
423
11th to 20thDay
20%12%34%25%7%1
447
21st to endDay
19%5%28%28%17%4
485
June1st to 10thDay
17%8%31%29%12%3
450
11th to 20thDay
15%10%32%31%10%2
450
21st to endDay
13%7%30%32%16%2
450
July1st to 10thDay
12%424%36%18%6%
445
11th to 20thDay
10%424%35%23%5%
444
21st to endDay
14%5%28%33%18%3
488
August1st to 10thDay
11%5%23%37%17%7%
446
11th to 20thDay
14%5%19%38%20%5%
439
21st to endDay
12%426%34%16%7%
495
September1st to 10thDay
17%6%28%25%18%7%
450
11th to 20thDay
14%429%28%15%9%
450
21st to endDay
21%9%28%24%12%5%
450
October1st to 10thDay
25%7%26%23%15%3
450
11th to 20thDay
18%12%32%24%11%2
450
21st to endDay
24%12%34%21%8%1
417
November1st to 10thDay
14%13%33%24%13%2
365
11th to 20thDay
21%19%31%22%6%1
370
21st to endDay
17%16%37%22%7%1
313
December1st to 10thDay
22%21%36%14%7%
180
11th to 20thDay
28%24%33%11%4
180
21st to endDay
26%18%37%11%8%
198
January1st to 10thNight
19%16%42%19%4
760
11th to 20thNight
25%14%34%24%3
728
21st to endNight
18%17%41%21%3
792
February1st to 10thNight
22%14%37%25%2
720
11th to 20thNight
22%17%41%19%1
703
21st to endNight
23%17%36%20%3
592
March1st to 10thNight
21%14%38%22%4
720
11th to 20thNight
23%12%39%22%41
720
21st to endNight
21%13%38%23%5%
792
April1st to 10thNight
21%16%36%22%5%
720
11th to 20thNight
21%11%35%26%7%
711
21st to endNight
22%12%32%28%5%1
686
May1st to 10thNight
24%10%34%24%8%1
540
11th to 20thNight
22%8%37%26%7%
408
21st to endNight
20%5%18%40%15%2
389
June1st to 10thNight
20%426%34%14%1
360
11th to 20thNight
14%5%24%41%16%
360
21st to endNight
10%321%53%13%1
360
July1st to 10thNight
12%320%44%19%1
350
11th to 20thNight
13%219%43%21%2
348
21st to endNight
12%421%44%19%1
394
August1st to 10thNight
11%221%44%21%1
473
11th to 20thNight
15%418%37%25%2
710
21st to endNight
14%418%38%24%2
792
September1st to 10thNight
16%325%35%18%3
720
11th to 20thNight
16%426%30%19%4
720
21st to endNight
20%425%32%16%3
720
October1st to 10thNight
22%8%26%25%16%3
720
11th to 20thNight
17%11%29%33%10%1
720
21st to endNight
24%10%35%24%7%1
792
November1st to 10thNight
15%10%34%28%12%1
740
11th to 20thNight
22%14%32%24%8%
760
21st to endNight
17%14%35%27%6%1
760
December1st to 10thNight
26%13%34%21%5%1
760
11th to 20thNight
22%14%35%24%4
760
21st to endNight
23%14%37%23%2
836
Page generated at 2024-01-09 16:24:23. Version ac07

Copyright 2024 Attilla Danko


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