Trap Pond State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Trap Pond State Park 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
39%
23474
20%
74615
12%
23428
48%
23428
24%
46933

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
23%
758
24%
2649
9%
757
43%
757
21%
1583
January11th to 20thNight
27%
727
21%
2415
10%
727
41%
727
20%
1549
January21st to endNight
23%
792
25%
2574
10%
792
42%
792
23%
1561
February1st to 10thNight
23%
720
17%
2340
7%
720
38%
720
21%
1484
February11th to 20thNight
18%
702
20%
2117
7%
700
35%
700
19%
1384
February21st to endNight
21%
592
26%
1776
9%
592
41%
592
21%
1137
March1st to 10thNight
24%
720
22%
2129
8%
720
40%
720
26%
1317
March11th to 20thNight
25%
720
21%
1980
9%
720
37%
720
24%
1301
March21st to endNight
25%
792
20%
2066
7%
792
34%
792
24%
1423
April1st to 10thNight
22%
720
19%
1800
4%
720
32%
720
25%
1231
April11th to 20thNight
36%
711
21%
1775
8%
711
42%
711
32%
1160
April21st to endNight
33%
720
19%
1800
7%
720
38%
720
29%
1239
May1st to 10thNight
35%
676
16%
1756
7%
676
40%
676
25%
1224
May11th to 20thNight
39%
383
16%
1444
11%
383
47%
383
19%
940
May21st to endNight
52%
388
15%
1551
16%
388
56%
388
18%
984
June1st to 10thNight
54%
360
16%
1440
17%
360
58%
360
21%
876
June11th to 20thNight
56%
360
16%
1440
16%
360
61%
360
21%
885
June21st to endNight
60%
360
14%
1440
17%
360
63%
360
22%
863
July1st to 10thNight
62%
350
15%
1400
18%
350
65%
350
21%
854
July11th to 20thNight
70%
348
17%
1392
22%
348
70%
348
26%
776
July21st to endNight
66%
531
17%
1616
15%
502
69%
502
28%
998
August1st to 10thNight
67%
543
15%
1606
12%
540
67%
540
27%
1030
August11th to 20thNight
62%
710
17%
1774
10%
710
64%
710
30%
1195
August21st to endNight
63%
792
17%
1980
9%
792
64%
792
32%
1333
September1st to 10thNight
57%
720
22%
1800
14%
720
60%
720
33%
1190
September11th to 20thNight
61%
720
27%
1820
19%
720
64%
720
38%
1141
September21st to endNight
46%
720
19%
1982
15%
720
51%
720
23%
1371
October1st to 10thNight
48%
720
19%
2160
17%
720
53%
720
26%
1380
October11th to 20thNight
44%
720
25%
2160
20%
720
53%
720
30%
1313
October21st to endNight
37%
792
25%
2385
16%
792
49%
792
28%
1464
November1st to 10thNight
40%
740
24%
2407
16%
740
53%
740
28%
1411
November11th to 20thNight
32%
760
24%
2470
14%
760
46%
760
25%
1506
November21st to endNight
37%
760
25%
2531
15%
760
53%
760
27%
1457
December1st to 10thNight
25%
760
20%
2660
9%
760
41%
760
19%
1667
December11th to 20thNight
25%
760
21%
3178
9%
759
41%
759
18%
1900
December21st to endNight
29%
827
15%
4802
11%
817
44%
817
13%
2806

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
14%5%25%5%35%5%5%8%43%
74715
Night
14%6%35%5%3445%7%44%
74995
TransparencyDay
38%7%13%23%16%3
74421
Night
39%7%12%22%17%3
74808
SeeingDay
17%12%28%25%14%5%
13996
Night
17%10%29%31%13%1
23487

By Month

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 10thDay
14%7%35%4245%5%7%44%
1517
11th to 20thDay
16%6%36%6%34446%43%
1570
21st to endDay
16%6%26%5%35%45%6%43%
1782
February1st to 10thDay
14%7%36%5%345%6%8%38%
1620
11th to 20thDay
18%6%24434445%45%
1730
21st to endDay
17%9%36%5%34448%38%
1480
March1st to 10thDay
14%6%244235%46%50%
1826
11th to 20thDay
17%6%2442445%6%45%
1980
21st to endDay
17%6%35%5%35%5%5%6%40%
2289
April1st to 10thDay
14%6%345%2445%6%48%
2160
11th to 20thDay
12%5%24424448%50%
2134
21st to endDay
15%7%344345%49%43%
2160
May1st to 10thDay
14%6%36%425%45%8%42%
2202
11th to 20thDay
17%6%25%435%5%6%8%40%
2464
21st to endDay
13%5%25%5%35%5%6%9%42%
2725
June1st to 10thDay
12%5%35%5%35%6%7%10%40%
2520
11th to 20thDay
12%5%25%5%35%6%6%10%42%
2520
21st to endDay
9%4245%35%6%7%11%43%
2520
July1st to 10thDay
9%5%35%6%35%5%6%10%42%
2520
11th to 20thDay
6%3245%36%6%8%11%45%
2520
21st to endDay
9%435%6%5%6%8%8%11%34%
2603
August1st to 10thDay
10%6%26%6%47%7%7%11%36%
2302
11th to 20thDay
10%5%36%7%46%6%6%10%38%
2126
21st to endDay
10%5%26%7%46%6%6%8%40%
2376
September1st to 10thDay
14%425%5%45%5%7%7%42%
2160
11th to 20thDay
11%6%25%5%35%5%5%7%45%
2138
21st to endDay
18%6%36%5%3445%6%39%
1976
October1st to 10thDay
16%6%35%5%445%46%43%
1800
11th to 20thDay
18%6%23323445%51%
1800
21st to endDay
14%6%34434445%48%
1968
November1st to 10thDay
13%5%15%42445%7%51%
1671
11th to 20thDay
13%5%35%5%3445%5%49%
1710
21st to endDay
15%425%434347%48%
1644
December1st to 10thDay
16%6%35%5%345%5%8%41%
1520
11th to 20thDay
16%8%35%43434447%
1910
21st to endDay
16%6%25%4345%5%7%43%
2772
January1st to 10thNight
15%7%3442445%6%47%
2649
11th to 20thNight
16%7%26%5%34446%42%
2415
21st to endNight
15%6%34434445%47%
2574
February1st to 10thNight
17%7%344345%47%42%
2340
11th to 20thNight
18%8%344335%46%42%
2115
21st to endNight
19%6%34323446%45%
1776
March1st to 10thNight
15%6%245%23446%49%
2129
11th to 20thNight
18%6%3443445%8%43%
1980
21st to endNight
17%8%45%5%24346%41%
2066
April1st to 10thNight
17%6%245%35%45%7%41%
1800
11th to 20thNight
11%6%36%5%3445%6%48%
1775
21st to endNight
18%5%245%35%5%6%7%42%
1800
May1st to 10thNight
16%6%35%5%345%6%8%39%
1756
11th to 20thNight
16%6%37%4345%6%7%39%
1444
21st to endNight
13%8%36%4345%6%8%41%
1550
June1st to 10thNight
12%6%34445%5%6%7%43%
1440
11th to 20thNight
11%5%25%6%45%6%5%10%41%
1440
21st to endNight
9%436%6%35%6%7%11%40%
1440
July1st to 10thNight
9%5%26%6%45%6%8%9%41%
1440
11th to 20thNight
5%5%25%6%27%5%7%10%46%
1440
21st to endNight
6%426%7%46%6%6%11%41%
1711
August1st to 10thNight
8%436%6%45%6%7%10%41%
1617
11th to 20thNight
10%6%25%6%45%5%7%10%42%
1774
21st to endNight
8%6%35%5%35%5%6%9%43%
1980
September1st to 10thNight
15%7%245%2435%8%46%
1800
11th to 20thNight
10%425%5%3345%8%51%
1820
21st to endNight
19%7%25%5%345%5%7%38%
1982
October1st to 10thNight
16%7%25%5%24347%45%
2160
11th to 20thNight
17%5%24323445%50%
2160
21st to endNight
15%7%34423446%47%
2385
November1st to 10thNight
11%6%35%5%23346%52%
2407
11th to 20thNight
14%6%35%433345%49%
2470
21st to endNight
12%5%3442445%6%51%
2531
December1st to 10thNight
17%8%35%42346%7%40%
2660
11th to 20thNight
18%6%246%23446%44%
3285
21st to endNight
15%7%36%5%35%5%5%7%40%
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
39%6%11%23%17%4
1518
11th to 20thDay
43%414%20%16%3
1570
21st to endDay
42%5%9%25%16%3
1782
February1st to 10thDay
44%6%12%24%12%2
1620
11th to 20thDay
40%5%10%25%17%3
1739
21st to endDay
47%5%12%18%13%5%
1480
March1st to 10thDay
35%5%12%25%19%3
1826
11th to 20thDay
39%6%11%21%19%4
1980
21st to endDay
45%7%8%21%16%4
2289
April1st to 10thDay
37%6%12%21%18%6%
2160
11th to 20thDay
33%7%12%23%19%6%
2134
21st to endDay
38%7%13%19%17%5%
2160
May1st to 10thDay
39%7%16%21%14%3
2202
11th to 20thDay
40%9%14%20%14%3
2468
21st to endDay
38%8%16%25%12%1
2725
June1st to 10thDay
38%9%16%21%15%2
2520
11th to 20thDay
37%9%16%21%14%3
2520
21st to endDay
32%10%17%23%18%1
2520
July1st to 10thDay
37%10%14%22%16%2
2450
11th to 20thDay
29%11%19%27%11%3
2445
21st to endDay
37%12%15%20%14%1
2457
August1st to 10thDay
38%12%16%24%10%1
2289
11th to 20thDay
40%10%15%22%12%1
2126
21st to endDay
39%9%14%20%14%4
2376
September1st to 10thDay
38%9%15%18%16%3
2160
11th to 20thDay
37%6%11%23%20%3
2138
21st to endDay
45%7%9%18%17%3
1976
October1st to 10thDay
42%7%10%21%17%3
1800
11th to 20thDay
36%410%25%22%3
1800
21st to endDay
38%5%7%26%21%3
1968
November1st to 10thDay
33%5%11%29%18%4
1671
11th to 20thDay
37%6%10%22%22%4
1710
21st to endDay
37%5%9%29%17%3
1644
December1st to 10thDay
41%6%15%23%12%3
1520
11th to 20thDay
41%410%29%12%3
1906
21st to endDay
38%8%17%23%14%
2772
January1st to 10thNight
39%5%10%22%19%5%
2649
11th to 20thNight
43%6%12%23%15%2
2415
21st to endNight
39%49%26%18%3
2574
February1st to 10thNight
42%5%13%23%15%2
2340
11th to 20thNight
43%5%8%20%18%5%
2117
21st to endNight
41%5%9%23%19%4
1776
March1st to 10thNight
37%5%11%25%18%3
2129
11th to 20thNight
41%6%11%22%18%4
1980
21st to endNight
45%5%10%17%18%5%
2066
April1st to 10thNight
42%6%10%19%18%5%
1800
11th to 20thNight
36%6%13%19%20%6%
1775
21st to endNight
41%7%11%21%16%4
1800
May1st to 10thNight
42%7%11%22%15%2
1756
11th to 20thNight
43%9%14%15%17%2
1445
21st to endNight
42%10%15%21%12%1
1551
June1st to 10thNight
38%9%12%22%17%2
1440
11th to 20thNight
38%10%12%23%15%2
1440
21st to endNight
36%11%15%21%15%2
1440
July1st to 10thNight
37%12%17%20%13%3
1400
11th to 20thNight
31%9%19%27%13%1
1392
21st to endNight
34%10%16%24%16%
1616
August1st to 10thNight
35%11%18%21%14%
1606
11th to 20thNight
36%11%16%22%15%1
1774
21st to endNight
36%10%17%20%15%3
1980
September1st to 10thNight
38%6%15%22%14%4
1800
11th to 20thNight
32%7%13%25%21%3
1820
21st to endNight
44%8%10%19%16%3
1982
October1st to 10thNight
40%6%10%23%19%3
2160
11th to 20thNight
37%5%10%25%20%3
2160
21st to endNight
38%5%10%24%20%4
2385
November1st to 10thNight
35%5%9%26%19%6%
2407
11th to 20thNight
39%5%9%20%21%5%
2470
21st to endNight
34%5%12%25%21%4
2531
December1st to 10thNight
43%5%12%24%13%3
2660
11th to 20thNight
41%5%10%22%19%3
3288
21st to endNight
40%8%16%24%10%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
20%23%36%16%41
180
11th to 20thDay
21%30%29%16%5%
216
21st to endDay
21%22%40%14%3
264
February1st to 10thDay
22%25%38%10%5%
240
11th to 20thDay
25%21%40%12%2
398
21st to endDay
24%19%38%14%4
346
March1st to 10thDay
20%23%33%20%4
420
11th to 20thDay
23%19%34%18%32
420
21st to endDay
23%19%33%20%5%
462
April1st to 10thDay
19%20%38%15%5%2
420
11th to 20thDay
16%14%34%27%7%2
412
21st to endDay
21%14%34%22%7%2
420
May1st to 10thDay
21%16%35%19%9%1
423
11th to 20thDay
20%11%32%27%9%1
447
21st to endDay
18%5%21%32%18%5%
485
June1st to 10thDay
13%7%28%31%17%4
450
11th to 20thDay
13%6%26%31%18%6%
450
21st to endDay
10%424%38%19%4
450
July1st to 10thDay
11%318%32%26%9%
445
11th to 20thDay
3215%40%29%11%
444
21st to endDay
9%320%34%26%8%
488
August1st to 10thDay
10%419%32%24%11%
446
11th to 20thDay
10%415%31%31%9%
439
21st to endDay
8%5%18%31%25%13%
495
September1st to 10thDay
15%420%28%18%14%
450
11th to 20thDay
12%5%23%29%20%10%
450
21st to endDay
22%9%26%26%12%5%
450
October1st to 10thDay
19%7%24%26%16%8%
450
11th to 20thDay
19%10%25%24%19%2
450
21st to endDay
17%12%34%25%11%2
489
November1st to 10thDay
18%11%27%24%16%4
365
11th to 20thDay
16%16%34%22%11%1
370
21st to endDay
16%17%29%26%10%2
304
December1st to 10thDay
19%21%38%14%7%1
180
11th to 20thDay
22%21%33%17%7%
180
21st to endDay
22%20%27%23%8%1
198
January1st to 10thNight
18%17%37%23%5%
760
11th to 20thNight
19%16%33%28%4
727
21st to endNight
19%14%40%24%3
792
February1st to 10thNight
20%13%38%25%3
720
11th to 20thNight
23%19%36%20%2
703
21st to endNight
22%17%37%21%3
592
March1st to 10thNight
18%16%38%23%5%
720
11th to 20thNight
23%13%35%21%6%1
720
21st to endNight
20%12%38%24%5%
792
April1st to 10thNight
20%15%38%21%6%
720
11th to 20thNight
14%11%35%34%6%
711
21st to endNight
20%8%34%29%8%
720
May1st to 10thNight
19%9%32%31%9%1
676
11th to 20thNight
18%7%31%34%11%
383
21st to endNight
16%420%40%19%1
389
June1st to 10thNight
14%422%44%14%1
360
11th to 20thNight
11%221%44%23%
360
21st to endNight
8%320%50%19%
360
July1st to 10thNight
9%219%47%21%1
350
11th to 20thNight
4116%43%35%1
348
21st to endNight
5%115%47%29%3
531
August1st to 10thNight
8%211%47%30%2
543
11th to 20thNight
10%216%39%29%4
710
21st to endNight
9%315%40%29%5%
792
September1st to 10thNight
18%313%34%28%3
720
11th to 20thNight
12%417%34%30%4
720
21st to endNight
21%7%19%32%19%2
720
October1st to 10thNight
20%5%19%32%19%5%
720
11th to 20thNight
19%8%25%32%16%1
720
21st to endNight
18%8%33%27%11%2
792
November1st to 10thNight
14%9%32%30%13%2
740
11th to 20thNight
16%12%32%30%9%1
760
21st to endNight
14%13%32%30%11%1
760
December1st to 10thNight
23%13%33%21%9%1
760
11th to 20thNight
19%13%38%24%6%
760
21st to endNight
17%12%36%30%4
836
Page generated at 2024-01-09 07:14:42. Version ac07

Copyright 2024 Attilla Danko


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