Belleplain State Forest
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Belleplain State Forest clear sky chart from 2005-11-06 to 2024-03-28.

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%
23643
20%
80583
10%
23549
46%
23549
21%
50254

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
17%
753
25%
4330
7%
737
38%
737
12%
2311
January11th to 20thNight
23%
759
25%
4238
8%
740
40%
740
11%
2425
January21st to endNight
16%
830
15%
4477
8%
814
36%
814
11%
2792
February1st to 10thNight
21%
760
18%
2466
8%
760
35%
760
19%
1561
February11th to 20thNight
13%
743
20%
2218
4%
739
32%
739
16%
1440
February21st to endNight
20%
628
24%
1884
7%
628
41%
628
19%
1221
March1st to 10thNight
22%
760
22%
2280
8%
760
39%
760
24%
1401
March11th to 20thNight
22%
760
21%
2109
8%
760
35%
760
21%
1399
March21st to endNight
22%
821
20%
2110
7%
821
32%
821
23%
1444
April1st to 10thNight
21%
720
19%
1800
4%
720
30%
720
23%
1217
April11th to 20thNight
33%
711
20%
1775
6%
711
40%
711
28%
1194
April21st to endNight
31%
720
18%
1800
6%
720
36%
720
25%
1257
May1st to 10thNight
32%
611
15%
1691
6%
611
37%
611
22%
1182
May11th to 20thNight
36%
400
18%
1462
12%
400
43%
400
18%
958
May21st to endNight
48%
388
13%
1551
13%
388
52%
388
17%
1017
June1st to 10thNight
46%
360
16%
1440
17%
360
52%
360
21%
876
June11th to 20thNight
53%
360
16%
1440
17%
360
59%
360
21%
879
June21st to endNight
60%
360
16%
1440
20%
360
64%
360
24%
847
July1st to 10thNight
58%
350
14%
1400
17%
350
61%
350
19%
869
July11th to 20thNight
67%
348
17%
1392
22%
348
68%
348
24%
804
July21st to endNight
61%
440
19%
1530
16%
416
66%
416
25%
901
August1st to 10thNight
63%
559
15%
1622
12%
556
65%
556
28%
1067
August11th to 20thNight
57%
710
16%
1774
9%
710
59%
710
31%
1201
August21st to endNight
61%
792
17%
1980
9%
792
63%
792
33%
1318
September1st to 10thNight
54%
720
22%
1800
13%
720
58%
720
30%
1226
September11th to 20thNight
58%
720
27%
1846
17%
720
62%
720
38%
1139
September21st to endNight
43%
720
21%
1980
14%
720
50%
720
25%
1341
October1st to 10thNight
45%
720
17%
2119
13%
720
50%
720
26%
1374
October11th to 20thNight
41%
720
26%
2160
17%
720
54%
720
29%
1295
October21st to endNight
30%
792
24%
2441
13%
792
45%
792
24%
1512
November1st to 10thNight
35%
740
24%
2407
13%
740
50%
740
27%
1386
November11th to 20thNight
28%
760
25%
2470
13%
760
45%
760
21%
1505
November21st to endNight
29%
760
25%
2522
11%
760
47%
760
23%
1484
December1st to 10thNight
21%
760
19%
2660
7%
760
37%
760
16%
1717
December11th to 20thNight
20%
760
20%
3176
5%
759
38%
759
15%
1877
December21st to endNight
25%
828
14%
4793
10%
817
40%
817
12%
2817

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%6%25%5%345%6%8%43%
78740
Night
15%7%35%5%3445%7%43%
81222
TransparencyDay
38%7%13%23%16%3
78448
Night
40%6%12%23%16%3
81048
SeeingDay
17%13%28%27%12%3
14233
Night
18%13%29%27%12%1
23666

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
15%9%24324345%48%
2517
11th to 20thDay
15%8%37%6%34445%41%
2598
21st to endDay
21%10%36%5%33435%37%
3124
February1st to 10thDay
14%8%26%425%5%6%7%40%
1712
11th to 20thDay
17%7%35%43445%6%43%
1848
21st to endDay
17%9%37%43435%6%38%
1570
March1st to 10thDay
15%5%245%24346%48%
1897
11th to 20thDay
15%6%24425%5%5%7%44%
2066
21st to endDay
18%7%25%5%35%5%5%6%40%
2399
April1st to 10thDay
14%7%45%42445%7%44%
2160
11th to 20thDay
13%6%24435%5%5%8%47%
2134
21st to endDay
15%6%25%5%35%5%6%9%40%
2160
May1st to 10thDay
15%7%35%5%345%6%9%39%
2268
11th to 20thDay
16%7%245%35%5%5%9%40%
2447
21st to endDay
13%6%25%5%345%5%9%43%
2725
June1st to 10thDay
11%6%25%4346%7%10%41%
2520
11th to 20thDay
10%5%26%5%35%7%7%10%41%
2520
21st to endDay
10%424435%6%7%11%44%
2520
July1st to 10thDay
9%5%35%6%45%5%7%11%42%
2520
11th to 20thDay
6%3245%35%6%8%13%45%
2520
21st to endDay
9%5%35%6%46%6%8%11%37%
2693
August1st to 10thDay
9%5%25%5%45%6%6%11%42%
2286
11th to 20thDay
11%5%26%5%45%6%7%10%40%
2126
21st to endDay
10%6%25%5%36%6%8%9%40%
2376
September1st to 10thDay
14%5%25%4345%6%8%44%
2160
11th to 20thDay
11%5%35%5%3346%8%48%
2113
21st to endDay
16%7%36%5%345%6%7%39%
1980
October1st to 10thDay
16%7%3443435%7%44%
1836
11th to 20thDay
15%5%25%333346%50%
1800
21st to endDay
15%6%36%5%34345%46%
1913
November1st to 10thDay
13%5%2443445%6%51%
1671
11th to 20thDay
15%5%2442345%8%47%
1710
21st to endDay
14%5%35%434447%47%
1653
December1st to 10thDay
17%7%35%426%5%5%8%39%
1520
11th to 20thDay
18%8%245%23346%45%
1906
21st to endDay
16%7%245%345%6%8%41%
2772
January1st to 10thNight
16%6%34424446%46%
4429
11th to 20thNight
19%8%25%423345%44%
4344
21st to endNight
20%9%35%5%33445%39%
4532
February1st to 10thNight
16%6%35%5%34446%43%
2466
11th to 20thNight
19%7%25%43445%5%42%
2218
21st to endNight
17%6%3443345%6%44%
1884
March1st to 10thNight
15%6%24424347%48%
2270
11th to 20thNight
16%7%35%434446%44%
2108
21st to endNight
17%7%36%5%34435%42%
2110
April1st to 10thNight
17%8%35%4245%5%6%42%
1800
11th to 20thNight
13%6%26%6%3445%7%45%
1775
21st to endNight
18%6%25%43445%7%41%
1800
May1st to 10thNight
15%7%46%6%45%46%8%35%
1691
11th to 20thNight
15%8%45%5%45%5%47%38%
1461
21st to endNight
14%8%36%5%47%5%5%8%36%
1550
June1st to 10thNight
14%6%36%5%3445%9%41%
1440
11th to 20thNight
10%5%26%6%46%5%5%10%41%
1440
21st to endNight
9%425%6%446%7%10%41%
1440
July1st to 10thNight
9%5%36%6%46%6%6%8%41%
1440
11th to 20thNight
6%5%35%5%36%6%7%10%44%
1440
21st to endNight
8%436%6%36%6%7%10%41%
1620
August1st to 10thNight
8%5%35%6%46%6%7%9%40%
1633
11th to 20thNight
9%5%36%5%36%6%7%9%42%
1774
21st to endNight
10%5%35%5%346%7%9%44%
1980
September1st to 10thNight
14%7%25%5%345%5%7%43%
1800
11th to 20thNight
10%5%244235%5%8%52%
1846
21st to endNight
18%7%25%43445%7%40%
1980
October1st to 10thNight
16%7%25%5%34446%44%
2119
11th to 20thNight
17%5%2432335%6%51%
2160
21st to endNight
15%7%35%434446%47%
2441
November1st to 10thNight
12%6%2442435%6%52%
2407
11th to 20thNight
15%6%25%434436%48%
2470
21st to endNight
12%4345%35%5%5%7%48%
2522
December1st to 10thNight
18%8%35%5%3445%7%40%
2660
11th to 20thNight
17%5%35%5%2445%8%42%
3288
21st to endNight
15%8%36%5%345%6%8%38%
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%312%28%15%3
2518
11th to 20thDay
44%5%12%22%14%4
2598
21st to endDay
48%8%9%20%12%2
3124
February1st to 10thDay
42%5%14%25%13%1
1712
11th to 20thDay
42%410%25%15%4
1857
21st to endDay
46%5%10%20%14%5%
1570
March1st to 10thDay
37%5%10%27%17%3
1900
11th to 20thDay
38%6%12%22%18%5%
2066
21st to endDay
44%7%7%21%17%4
2399
April1st to 10thDay
39%7%12%19%18%6%
2160
11th to 20thDay
35%6%13%23%19%5%
2134
21st to endDay
39%7%13%18%19%4
2160
May1st to 10thDay
40%8%13%21%15%3
2268
11th to 20thDay
42%7%14%21%14%3
2451
21st to endDay
38%9%15%26%12%1
2725
June1st to 10thDay
36%11%15%23%14%2
2520
11th to 20thDay
35%12%14%24%13%2
2520
21st to endDay
31%10%16%24%18%1
2520
July1st to 10thDay
35%9%16%23%15%2
2450
11th to 20thDay
27%10%17%30%13%2
2445
21st to endDay
36%10%14%24%15%1
2542
August1st to 10thDay
34%9%16%27%14%1
2273
11th to 20thDay
37%10%15%22%14%2
2126
21st to endDay
34%9%15%24%15%3
2376
September1st to 10thDay
35%8%16%21%17%3
2160
11th to 20thDay
34%6%11%24%23%3
2113
21st to endDay
43%7%11%17%19%3
1980
October1st to 10thDay
40%6%13%23%17%2
1836
11th to 20thDay
36%410%25%23%2
1800
21st to endDay
41%5%10%25%18%2
1913
November1st to 10thDay
34%413%28%16%3
1671
11th to 20thDay
37%5%11%23%23%3
1710
21st to endDay
37%5%11%29%15%3
1653
December1st to 10thDay
43%6%16%20%13%2
1520
11th to 20thDay
41%411%28%12%3
1906
21st to endDay
39%7%16%24%14%1
2772
January1st to 10thNight
39%410%28%15%4
4429
11th to 20thNight
43%411%25%15%2
4344
21st to endNight
47%49%25%13%2
4532
February1st to 10thNight
42%5%13%23%14%2
2466
11th to 20thNight
44%49%19%19%5%
2220
21st to endNight
42%5%9%22%17%4
1884
March1st to 10thNight
38%411%25%19%3
2280
11th to 20thNight
42%6%10%21%18%5%
2109
21st to endNight
45%49%17%19%6%
2110
April1st to 10thNight
43%5%10%19%19%5%
1800
11th to 20thNight
40%6%9%20%20%5%
1775
21st to endNight
43%7%9%18%19%5%
1800
May1st to 10thNight
47%6%10%20%15%2
1691
11th to 20thNight
47%6%11%18%17%2
1462
21st to endNight
45%9%14%19%11%1
1551
June1st to 10thNight
41%7%13%20%18%2
1440
11th to 20thNight
38%9%12%25%13%2
1440
21st to endNight
35%9%13%26%14%3
1440
July1st to 10thNight
40%10%15%21%12%2
1400
11th to 20thNight
32%11%16%26%13%2
1392
21st to endNight
35%9%14%25%16%1
1530
August1st to 10thNight
37%10%17%22%13%
1622
11th to 20thNight
35%11%16%23%14%1
1774
21st to endNight
35%9%16%20%17%3
1980
September1st to 10thNight
40%7%11%22%16%4
1800
11th to 20thNight
30%8%13%24%23%3
1846
21st to endNight
44%6%9%21%18%3
1980
October1st to 10thNight
42%5%12%21%18%2
2119
11th to 20thNight
36%411%27%18%3
2160
21st to endNight
39%5%10%24%18%3
2441
November1st to 10thNight
34%5%11%25%19%5%
2407
11th to 20thNight
39%5%10%20%21%5%
2470
21st to endNight
35%5%12%26%18%2
2522
December1st to 10thNight
45%6%12%22%13%2
2660
11th to 20thNight
40%5%12%21%19%3
3288
21st to endNight
42%6%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
18%26%33%17%5%1
180
11th to 20thDay
21%30%31%16%3
204
21st to endDay
22%22%32%21%31
297
February1st to 10thDay
22%18%42%15%3
272
11th to 20thDay
25%24%37%13%1
456
21st to endDay
24%25%31%15%4
382
March1st to 10thDay
18%24%35%19%3
460
11th to 20thDay
20%23%35%18%32
460
21st to endDay
21%17%37%21%21
490
April1st to 10thDay
19%21%37%17%5%1
420
11th to 20thDay
15%17%35%25%6%1
412
21st to endDay
22%15%36%22%5%
420
May1st to 10thDay
23%14%32%23%5%1
423
11th to 20thDay
22%9%33%28%7%1
447
21st to endDay
20%5%20%35%18%3
485
June1st to 10thDay
13%5%32%29%17%3
450
11th to 20thDay
13%6%28%37%14%2
450
21st to endDay
12%328%39%17%2
450
July1st to 10thDay
11%419%36%22%7%
445
11th to 20thDay
5%217%43%27%6%
444
21st to endDay
10%322%39%22%3
488
August1st to 10thDay
12%419%38%24%4
446
11th to 20thDay
12%315%38%26%6%
439
21st to endDay
10%422%34%21%9%
495
September1st to 10thDay
17%5%19%30%20%9%
450
11th to 20thDay
13%427%30%20%6%
450
21st to endDay
21%9%26%30%11%3
450
October1st to 10thDay
22%7%22%30%14%5%
450
11th to 20thDay
17%14%23%27%17%2
450
21st to endDay
18%16%30%24%9%2
462
November1st to 10thDay
16%15%30%23%13%3
365
11th to 20thDay
16%21%34%22%8%
370
21st to endDay
17%20%30%22%9%1
313
December1st to 10thDay
24%21%34%17%5%
180
11th to 20thDay
24%25%29%17%4
180
21st to endDay
23%20%31%19%7%1
198
January1st to 10thNight
20%24%34%17%5%
760
11th to 20thNight
23%21%29%24%3
760
21st to endNight
18%23%39%19%2
836
February1st to 10thNight
20%18%36%23%2
760
11th to 20thNight
25%25%34%15%1
743
21st to endNight
21%21%34%20%3
628
March1st to 10thNight
19%20%35%21%4
760
11th to 20thNight
22%20%32%19%6%1
760
21st to endNight
21%14%38%21%5%1
821
April1st to 10thNight
20%19%36%20%5%
720
11th to 20thNight
16%13%34%30%8%
711
21st to endNight
21%9%34%28%6%1
720
May1st to 10thNight
20%10%32%30%8%
611
11th to 20thNight
19%7%31%34%9%
400
21st to endNight
17%322%34%21%2
389
June1st to 10thNight
17%424%39%15%1
360
11th to 20thNight
13%325%37%21%1
360
21st to endNight
8%221%49%19%2
360
July1st to 10thNight
10%320%44%21%3
350
11th to 20thNight
8%212%43%32%3
348
21st to endNight
8%317%46%25%2
440
August1st to 10thNight
11%413%42%29%2
559
11th to 20thNight
10%319%39%26%3
710
21st to endNight
12%314%39%28%4
792
September1st to 10thNight
17%317%34%24%4
720
11th to 20thNight
12%321%33%26%5%
720
21st to endNight
22%6%22%29%20%1
720
October1st to 10thNight
20%7%22%28%19%4
720
11th to 20thNight
19%12%24%29%16%1
720
21st to endNight
20%14%32%22%11%1
792
November1st to 10thNight
16%14%32%25%11%2
740
11th to 20thNight
19%18%30%26%7%1
760
21st to endNight
15%19%33%22%10%1
760
December1st to 10thNight
23%20%31%16%8%2
760
11th to 20thNight
18%21%37%19%5%
760
21st to endNight
19%18%34%26%3
836
Page generated at 2024-03-24 23:37:00. Version ac07

Copyright © 2024 Attilla Danko.


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