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 2005-11-05 to 2018-04-23.

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
35%
16122
20%
49530
11%
16088
46%
16088
22%
31361

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%
777
22%
2690
9%
776
41%
776
19%
1619
January16th to endNight
22%
832
23%
2704
8%
832
40%
832
20%
1676
February1st to 15thNight
20%
762
19%
2434
7%
761
36%
761
18%
1532
February16th to endNight
20%
683
25%
2049
9%
683
41%
683
21%
1293
March1st to 15thNight
22%
780
20%
2252
8%
780
35%
780
21%
1456
March16th to endNight
23%
832
21%
2207
8%
832
34%
832
22%
1489
April1st to 15thNight
24%
778
19%
1946
5%
778
32%
778
25%
1292
April16th to endNight
33%
743
18%
1857
6%
743
38%
743
25%
1266
May1st to 15thNight
30%
588
16%
1668
7%
588
37%
588
21%
1143
May16th to endNight
44%
374
15%
1497
13%
374
51%
374
16%
929
June1st to 15thNight
50%
360
16%
1440
15%
360
56%
360
20%
871
June16th to endNight
50%
360
13%
1440
13%
360
54%
360
19%
870
July1st to 15thNight
57%
340
13%
1360
15%
340
60%
340
18%
843
July16th to endNight
60%
467
15%
1502
12%
438
67%
438
25%
906
August1st to 15thNight
60%
605
16%
1675
11%
602
62%
602
27%
1072
August16th to endNight
62%
764
18%
1910
10%
764
64%
764
31%
1263
September1st to 15thNight
54%
720
24%
1800
15%
720
57%
720
33%
1182
September16th to endNight
50%
717
21%
1937
14%
717
56%
717
25%
1286
October1st to 15thNight
46%
720
22%
2160
20%
720
52%
720
25%
1380
October16th to endNight
38%
768
28%
2311
17%
768
52%
768
28%
1383
November1st to 15thNight
34%
760
21%
2472
13%
760
46%
760
23%
1531
November16th to endNight
33%
780
24%
2577
14%
780
47%
780
21%
1560
December1st to 15thNight
25%
780
18%
2730
8%
780
39%
780
15%
1726
December16th to endNight
19%
832
22%
2912
8%
832
37%
832
17%
1793

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%2443445%7%42%
49982
Night
13%5%2442445%7%44%
49709
Cloud CoverDay
13%5%2442445%7%43%
49991
Night
14%5%2442445%7%44%
49714
TransparencyDay
39%6%12%22%15%2
49678
Night
39%6%11%22%16%3
49530
SeeingDay
16%14%23%23%15%6%
6522
Night
15%19%23%27%12%1
16128

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
13%6%344245%47%44%
1575
16th to endDay
17%5%24423346%43%
1872
February1st to 15thDay
15%6%25%5%25%45%6%41%
1757
16th to endDay
15%8%245%24445%41%
1710
March1st to 15thDay
15%5%2442445%6%45%
2024
16th to endDay
16%6%24434345%43%
2369
April1st to 15thDay
13%5%24423347%47%
2332
16th to endDay
15%5%25%413447%45%
2218
May1st to 15thDay
14%6%3442345%7%42%
2291
16th to endDay
13%4145%245%5%8%43%
2618
June1st to 15thDay
12%424435%46%10%40%
2520
16th to endDay
9%3244446%6%12%41%
2520
July1st to 15thDay
10%3245%345%6%10%41%
2520
16th to endDay
6%325%6%46%7%8%11%37%
2561
August1st to 15thDay
10%6%25%6%35%6%6%9%37%
2262
16th to endDay
9%426%6%46%5%5%7%41%
2292
September1st to 15thDay
12%4245%345%5%7%44%
2160
16th to endDay
16%6%26%445%45%5%38%
2021
October1st to 15thDay
16%7%25%5%34346%41%
1800
16th to endDay
14%5%24313335%51%
1911
November1st to 15thDay
17%5%2342345%6%44%
1716
16th to endDay
13%324423446%49%
1709
December1st to 15thDay
13%5%25%43445%6%42%
1560
16th to endDay
18%6%35%424336%41%
1664
January1st to 15thNight
14%5%3442445%5%45%
2690
16th to endNight
15%7%24423345%45%
2704
February1st to 15thNight
15%6%35%323445%44%
2433
16th to endNight
16%6%23413346%46%
2049
March1st to 15thNight
16%5%2432335%6%44%
2240
16th to endNight
17%7%35%422345%42%
2207
April1st to 15thNight
13%6%2443345%6%44%
1946
16th to endNight
16%5%244245%46%44%
1857
May1st to 15thNight
14%7%25%4236%5%8%37%
1668
16th to endNight
10%6%35%5%345%47%42%
1495
June1st to 15thNight
12%3245%345%5%8%44%
1440
16th to endNight
7%426%5%36%5%6%11%38%
1440
July1st to 15thNight
8%5%25%6%35%7%6%8%40%
1440
16th to endNight
5%325%6%37%5%7%11%40%
1605
August1st to 15thNight
6%425%5%35%5%7%9%42%
1686
16th to endNight
9%5%25%4335%6%9%44%
1910
September1st to 15thNight
13%7%2442345%7%45%
1800
16th to endNight
15%5%2443445%7%41%
1937
October1st to 15thNight
15%6%25%42335%5%45%
2160
16th to endNight
14%5%23323336%50%
2311
November1st to 15thNight
14%5%35%423335%48%
2472
16th to endNight
13%5%25%424446%46%
2577
December1st to 15thNight
16%7%25%42445%6%40%
2730
16th to endNight
17%5%2442435%6%43%
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%5%24424447%44%
1575
16th to endDay
17%5%15%42425%6%43%
1872
February1st to 15thDay
15%6%25%5%3445%6%41%
1757
16th to endDay
15%7%35%424436%41%
1710
March1st to 15thDay
15%5%24423446%45%
2034
16th to endDay
17%5%24424445%43%
2368
April1st to 15thDay
14%5%23424347%47%
2332
16th to endDay
15%6%24323438%45%
2218
May1st to 15thDay
15%5%25%42445%7%42%
2291
16th to endDay
13%41442445%8%43%
2618
June1st to 15thDay
13%324425%5%6%9%40%
2520
16th to endDay
9%423425%6%7%11%42%
2520
July1st to 15thDay
10%425%4345%6%11%42%
2520
16th to endDay
7%325%6%46%8%7%11%37%
2561
August1st to 15thDay
10%5%25%5%35%6%6%10%37%
2262
16th to endDay
9%426%7%35%5%5%8%41%
2292
September1st to 15thDay
13%425%43446%6%43%
2160
16th to endDay
16%6%36%4345%5%5%38%
2021
October1st to 15thDay
17%6%24433446%42%
1800
16th to endDay
14%423423435%51%
1911
November1st to 15thDay
16%5%1442435%6%44%
1716
16th to endDay
13%324424346%49%
1709
December1st to 15thDay
14%5%35%42445%7%42%
1560
16th to endDay
18%6%35%423335%41%
1664
January1st to 15thNight
15%5%2442445%6%45%
2690
16th to endNight
16%7%24423345%45%
2704
February1st to 15thNight
15%6%34323446%44%
2426
16th to endNight
16%6%24323445%46%
2049
March1st to 15thNight
16%6%2342345%6%44%
2252
16th to endNight
17%6%45%413236%42%
2207
April1st to 15thNight
14%6%2442445%6%44%
1946
16th to endNight
17%423424446%44%
1857
May1st to 15thNight
15%6%35%4235%6%8%37%
1668
16th to endNight
11%6%25%43446%7%41%
1495
June1st to 15thNight
12%5%24335%45%8%43%
1440
16th to endNight
8%426%6%35%6%6%10%39%
1440
July1st to 15thNight
8%5%25%6%36%5%7%8%40%
1440
16th to endNight
5%425%6%47%5%6%11%40%
1605
August1st to 15thNight
7%425%6%345%6%9%42%
1686
16th to endNight
9%5%3443445%10%44%
1910
September1st to 15thNight
12%5%25%5%2335%7%45%
1800
16th to endNight
16%5%245%3345%8%40%
1937
October1st to 15thNight
15%5%25%324346%45%
2160
16th to endNight
15%5%23323345%50%
2311
November1st to 15thNight
14%6%25%423235%48%
2472
16th to endNight
13%5%3442445%5%47%
2577
December1st to 15thNight
16%6%25%42445%6%39%
2730
16th to endNight
17%5%24423346%44%
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
39%5%13%21%15%5%
1576
16th to endDay
41%410%23%16%2
1872
February1st to 15thDay
42%411%23%14%2
1760
16th to endDay
44%410%23%14%2
1710
March1st to 15thDay
39%5%13%22%17%2
2034
16th to endDay
42%5%9%21%17%3
2369
April1st to 15thDay
36%5%10%24%16%4
2332
16th to endDay
37%5%11%18%20%6%
2218
May1st to 15thDay
39%7%14%21%14%2
2291
16th to endDay
37%7%15%24%12%2
2622
June1st to 15thDay
38%8%13%23%14%1
2520
16th to endDay
33%8%18%20%16%2
2520
July1st to 15thDay
35%9%14%23%13%2
2371
16th to endDay
35%11%16%21%13%2
2401
August1st to 15thDay
39%8%14%23%13%
2249
16th to endDay
38%8%13%19%16%3
2292
September1st to 15thDay
38%7%12%20%18%2
2160
16th to endDay
45%6%8%18%18%1
2021
October1st to 15thDay
42%6%9%23%14%3
1800
16th to endDay
35%37%28%22%2
1911
November1st to 15thDay
40%5%11%24%16%3
1716
16th to endDay
35%5%9%28%17%3
1709
December1st to 15thDay
40%5%14%23%12%3
1560
16th to endDay
44%412%25%12%1
1664
January1st to 15thNight
39%411%21%18%4
2690
16th to endNight
41%49%25%16%2
2704
February1st to 15thNight
41%410%25%15%2
2434
16th to endNight
38%5%9%24%19%2
2049
March1st to 15thNight
40%411%24%15%2
2252
16th to endNight
44%410%18%19%3
2207
April1st to 15thNight
38%5%11%21%18%4
1946
16th to endNight
40%5%10%17%19%5%
1857
May1st to 15thNight
43%7%12%20%14%2
1668
16th to endNight
40%8%15%19%14%1
1497
June1st to 15thNight
38%8%12%22%16%1
1440
16th to endNight
37%10%15%19%16%2
1440
July1st to 15thNight
39%9%15%20%13%2
1360
16th to endNight
34%9%17%24%13%1
1502
August1st to 15thNight
34%9%16%20%18%
1675
16th to endNight
34%9%14%20%18%2
1910
September1st to 15thNight
36%5%13%24%15%3
1800
16th to endNight
40%6%10%20%18%3
1937
October1st to 15thNight
40%5%9%24%16%3
2160
16th to endNight
35%49%25%20%3
2311
November1st to 15thNight
39%5%10%21%17%5%
2472
16th to endNight
37%5%10%22%19%4
2577
December1st to 15thNight
44%5%12%23%11%2
2730
16th to endNight
41%413%22%14%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
15%20%41%14%8%
95
16th to endDay
27%13%34%20%4
144
February1st to 15thDay
22%24%39%10%3
183
16th to endDay
18%20%37%17%4
291
March1st to 15thDay
18%26%27%21%6%
330
16th to endDay
18%20%31%23%33
352
April1st to 15thDay
16%23%29%21%7%1
330
16th to endDay
18%16%24%24%11%3
289
May1st to 15thDay
25%20%27%12%11%1
288
16th to endDay
19%12%18%22%19%6%
331
June1st to 15thDay
15%12%23%25%17%6%
315
16th to endDay
11%13%20%32%17%6%
315
July1st to 15thDay
14%7%13%29%26%9%
305
16th to endDay
5%10%11%31%26%14%
326
August1st to 15thDay
9%8%12%30%25%13%
313
16th to endDay
7%5%9%28%34%15%
332
September1st to 15thDay
11%5%22%23%19%16%
315
16th to endDay
22%8%16%23%16%12%
314
October1st to 15thDay
20%7%20%24%19%7%
315
16th to endDay
12%12%29%21%19%4
334
November1st to 15thDay
18%14%22%23%17%3
280
16th to endDay
12%22%28%20%12%2
239
December1st to 15thDay
20%17%26%18%14%2
90
16th to endDay
30%15%32%16%5%
96
January1st to 15thNight
14%27%28%23%5%
780
16th to endNight
18%23%32%22%2
832
February1st to 15thNight
17%25%31%23%1
764
16th to endNight
18%26%31%20%2
683
March1st to 15thNight
19%25%30%19%4
780
16th to endNight
19%23%29%20%6%1
832
April1st to 15thNight
16%24%32%22%4
778
16th to endNight
17%21%24%27%8%
743
May1st to 15thNight
17%22%27%23%9%
588
16th to endNight
13%19%17%35%13%
375
June1st to 15thNight
11%17%16%36%17%
360
16th to endNight
6%17%16%41%18%
360
July1st to 15thNight
7%12%13%43%22%
340
16th to endNight
316%11%38%27%2
467
August1st to 15thNight
9%10%9%41%25%3
605
16th to endNight
10%9%10%34%30%4
764
September1st to 15thNight
15%9%13%30%28%2
720
16th to endNight
18%11%14%31%21%3
717
October1st to 15thNight
17%12%18%30%19%2
720
16th to endNight
16%15%26%24%14%1
768
November1st to 15thNight
15%18%25%25%12%2
760
16th to endNight
13%25%23%27%9%
780
December1st to 15thNight
19%23%25%19%10%1
780
16th to endNight
17%25%33%20%3
832
Page generated at 2018-04-24 10:03:03. Version ac04

Copyright 2018 A. Danko


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