Vineland
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Vineland clear sky chart from 2005-11-06 to 2024-01-22.

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
34%
22939
8%
74984
6%
22892
38%
22892
9%
61361

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
15%
757
4%
2649
1%
757
18%
757
4%
2378
January11th to 20thNight
14%
760
2%
2489
1%
760
15%
760
3%
2293
January21st to endNight
19%
800
4%
2599
2%
800
22%
800
4%
2298
February1st to 10thNight
13%
720
4%
2340
1%
720
18%
720
5%
2034
February11th to 20thNight
18%
701
6%
2275
2%
700
24%
700
6%
1964
February21st to endNight
19%
592
6%
1856
1%
592
23%
592
6%
1603
March1st to 10thNight
25%
720
9%
1980
4%
720
29%
720
10%
1662
March11th to 20thNight
26%
720
11%
1980
6%
720
32%
720
10%
1646
March21st to endNight
33%
792
12%
2178
7%
792
37%
792
12%
1777
April1st to 10thNight
29%
720
10%
1836
4%
720
32%
720
13%
1497
April11th to 20thNight
32%
677
12%
1741
5%
677
36%
677
13%
1410
April21st to endNight
39%
540
10%
1620
5%
540
43%
540
11%
1322
May1st to 10thNight
43%
540
11%
1620
8%
540
46%
540
13%
1269
May11th to 20thNight
47%
390
16%
1452
14%
390
53%
390
13%
1063
May21st to endNight
55%
388
13%
1551
16%
388
59%
388
13%
1093
June1st to 10thNight
48%
360
10%
1440
10%
360
54%
360
11%
1085
June11th to 20thNight
51%
360
12%
1440
15%
360
55%
360
13%
1036
June21st to endNight
55%
360
10%
1440
14%
360
60%
360
12%
1054
July1st to 10thNight
64%
350
12%
1400
17%
350
67%
350
14%
967
July11th to 20thNight
58%
348
12%
1392
16%
348
62%
348
13%
997
July21st to endNight
63%
591
12%
1672
10%
558
65%
558
18%
1234
August1st to 10thNight
68%
537
10%
1600
9%
534
68%
534
15%
1237
August11th to 20thNight
63%
534
14%
1598
10%
534
65%
534
18%
1171
August21st to endNight
60%
684
13%
1872
9%
684
61%
684
19%
1396
September1st to 10thNight
55%
720
11%
1800
5%
720
58%
720
17%
1432
September11th to 20thNight
60%
720
17%
1902
11%
720
63%
720
20%
1433
September21st to endNight
48%
720
11%
2017
8%
720
50%
720
13%
1623
October1st to 10thNight
42%
720
10%
2160
9%
720
45%
720
12%
1715
October11th to 20thNight
30%
720
7%
2160
5%
720
33%
720
9%
1786
October21st to endNight
26%
792
8%
2376
6%
792
29%
792
8%
2009
November1st to 10thNight
34%
740
12%
2432
10%
740
38%
740
11%
1888
November11th to 20thNight
24%
760
10%
2660
7%
760
29%
760
8%
2165
November21st to endNight
21%
760
6%
2660
4%
760
25%
760
7%
2242
December1st to 10thNight
16%
760
2%
2660
1%
760
18%
760
3%
2400
December11th to 20thNight
15%
759
4%
3257
1%
759
19%
759
3%
2800
December21st to endNight
11%
827
1%
4880
0%
817
14%
817
1%
4382

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%9%47%6%45%5%6%7%33%
74734
Night
16%10%47%6%35%5%5%7%32%
75202
TransparencyDay
33%38%9%13%6%1
74451
Night
35%38%8%12%6%1
75019
SeeingDay
18%11%26%25%15%5%
13383
Night
20%10%28%28%13%1
22955

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%14%6%10%10%5%6%7%5%6%17%
1517
11th to 20thDay
15%15%6%11%9%46%6%5%6%16%
1688
21st to endDay
13%13%6%15%11%7%6%6%5%5%13%
1791
February1st to 10thDay
18%15%5%11%8%5%5%6%5%5%17%
1620
11th to 20thDay
12%16%7%12%9%446%5%6%19%
1573
21st to endDay
18%13%411%9%445%5%6%21%
1398
March1st to 10thDay
14%10%5%10%8%45%5%6%5%28%
1977
11th to 20thDay
13%12%48%7%45%446%33%
1980
21st to endDay
18%9%47%6%36%5%46%33%
2178
April1st to 10thDay
17%9%47%6%45%5%5%6%32%
2124
11th to 20thDay
17%8%36%5%3446%7%36%
2183
21st to endDay
18%8%46%5%45%5%5%6%34%
2340
May1st to 10thDay
14%8%36%7%45%6%5%8%35%
2340
11th to 20thDay
14%6%36%6%46%5%5%7%39%
2441
21st to endDay
10%435%5%36%6%7%9%44%
2725
June1st to 10thDay
12%5%36%5%35%5%6%8%42%
2520
11th to 20thDay
11%5%35%5%45%5%7%10%41%
2520
21st to endDay
11%425%435%5%6%10%44%
2520
July1st to 10thDay
5%3245%35%6%7%10%49%
2520
11th to 20thDay
11%6%245%35%7%8%9%40%
2516
21st to endDay
8%426%6%46%6%7%10%40%
2547
August1st to 10thDay
7%5%25%436%6%8%11%42%
2327
11th to 20thDay
8%426%6%46%6%8%10%40%
2303
21st to endDay
10%5%35%5%3446%10%46%
2466
September1st to 10thDay
12%7%35%5%35%5%7%9%40%
2160
11th to 20thDay
10%5%25%5%35%46%7%48%
2055
21st to endDay
14%6%26%7%36%5%8%8%36%
1942
October1st to 10thDay
18%8%36%5%35%5%6%6%34%
1800
11th to 20thDay
18%10%48%6%45%45%6%30%
1800
21st to endDay
24%12%48%6%345%45%24%
1980
November1st to 10thDay
13%8%48%6%45%5%5%7%34%
1645
11th to 20thDay
13%11%48%7%36%5%5%7%30%
1520
21st to endDay
19%14%48%7%446%5%6%25%
1520
December1st to 10thDay
17%14%6%10%8%45%5%5%7%19%
1520
11th to 20thDay
17%15%6%9%7%45%6%6%6%18%
1906
21st to endDay
26%18%6%10%8%45%44411%
2772
January1st to 10thNight
16%15%6%10%9%45%5%5%5%20%
2649
11th to 20thNight
18%15%7%11%9%5%6%5%5%5%15%
2489
21st to endNight
13%13%6%12%9%5%7%6%5%6%19%
2599
February1st to 10thNight
17%16%5%10%7%45%5%5%6%21%
2340
11th to 20thNight
15%13%5%10%7%46%5%5%7%23%
2273
21st to endNight
18%12%6%10%7%45%5%5%7%22%
1856
March1st to 10thNight
14%10%48%9%45%5%6%6%31%
1970
11th to 20thNight
17%11%5%8%5%345%46%32%
1979
21st to endNight
16%9%48%6%35%45%5%36%
2178
April1st to 10thNight
17%10%48%6%34447%33%
1836
11th to 20thNight
17%7%36%5%45%5%5%5%38%
1741
21st to endNight
16%8%37%445%5%6%6%35%
1620
May1st to 10thNight
15%8%46%5%3446%7%36%
1620
11th to 20thNight
13%6%36%5%35%6%6%7%41%
1451
21st to endNight
10%5%25%5%3446%7%49%
1550
June1st to 10thNight
11%5%36%5%45%6%7%9%38%
1440
11th to 20thNight
9%5%35%7%45%5%5%8%44%
1440
21st to endNight
11%6%25%5%35%5%6%9%45%
1440
July1st to 10thNight
5%4145%345%48%56%
1440
11th to 20thNight
9%425%5%245%6%9%48%
1440
21st to endNight
9%425%425%6%6%9%47%
1771
August1st to 10thNight
8%5%145%26%6%7%9%46%
1611
11th to 20thNight
7%426%5%35%7%6%10%46%
1598
21st to endNight
8%425%6%35%46%9%48%
1872
September1st to 10thNight
12%5%36%5%35%5%5%6%45%
1800
11th to 20thNight
11%5%2443445%7%52%
1902
21st to endNight
15%7%37%5%35%5%6%7%39%
2017
October1st to 10thNight
17%7%37%5%3345%7%38%
2160
11th to 20thNight
20%9%37%6%3445%7%32%
2160
21st to endNight
24%9%37%6%345%5%7%26%
2376
November1st to 10thNight
16%8%36%5%445%46%39%
2432
11th to 20thNight
15%10%46%7%46%46%7%31%
2660
21st to endNight
18%11%5%7%6%46%5%6%7%25%
2660
December1st to 10thNight
18%16%6%9%7%35%5%5%6%19%
2660
11th to 20thNight
15%17%7%9%7%45%5%5%6%21%
3288
21st to endNight
28%16%6%9%7%45%5%45%12%
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
45%42%6%6%1
1518
11th to 20thDay
46%41%6%6%1
1688
21st to endDay
49%39%7%41
1791
February1st to 10thDay
46%38%6%8%2
1620
11th to 20thDay
45%38%7%7%3
1582
21st to endDay
47%37%8%6%3
1398
March1st to 10thDay
36%39%10%11%31
1980
11th to 20thDay
35%38%8%11%7%1
1980
21st to endDay
35%38%6%15%5%1
2178
April1st to 10thDay
33%37%9%12%9%1
2124
11th to 20thDay
31%37%8%12%10%1
2183
21st to endDay
34%37%7%13%8%1
2340
May1st to 10thDay
31%37%8%13%9%2
2340
11th to 20thDay
29%38%7%14%12%2
2445
21st to endDay
22%39%11%16%10%2
2725
June1st to 10thDay
26%39%9%15%11%1
2520
11th to 20thDay
24%39%10%18%9%
2520
21st to endDay
24%40%11%16%8%1
2520
July1st to 10thDay
20%40%10%17%12%1
2450
11th to 20thDay
24%41%12%16%8%1
2441
21st to endDay
26%40%11%15%8%
2405
August1st to 10thDay
24%39%12%17%8%
2314
11th to 20thDay
22%39%12%16%10%1
2303
21st to endDay
24%38%9%19%9%1
2466
September1st to 10thDay
27%38%9%16%8%1
2160
11th to 20thDay
24%38%10%20%8%
2055
21st to endDay
31%39%10%14%5%1
1942
October1st to 10thDay
32%39%9%13%7%
1800
11th to 20thDay
39%38%8%12%3
1800
21st to endDay
41%38%8%9%31
1980
November1st to 10thDay
28%43%9%13%6%1
1645
11th to 20thDay
34%42%10%8%6%
1520
21st to endDay
38%40%9%10%3
1520
December1st to 10thDay
41%42%10%6%
1520
11th to 20thDay
44%38%9%6%3
1906
21st to endDay
61%28%6%4
2772
January1st to 10thNight
44%41%6%6%2
2649
11th to 20thNight
47%42%6%41
2489
21st to endNight
44%39%7%8%1
2599
February1st to 10thNight
43%38%6%9%4
2340
11th to 20thNight
41%39%9%8%4
2275
21st to endNight
42%38%8%8%4
1856
March1st to 10thNight
37%38%10%12%31
1980
11th to 20thNight
36%38%7%12%6%1
1980
21st to endNight
34%37%5%15%6%2
2178
April1st to 10thNight
33%37%6%14%9%1
1836
11th to 20thNight
32%37%6%13%11%1
1741
21st to endNight
34%38%6%10%10%1
1620
May1st to 10thNight
30%37%6%14%10%3
1620
11th to 20thNight
25%38%7%15%12%3
1452
21st to endNight
22%39%8%16%13%2
1551
June1st to 10thNight
27%40%8%14%10%1
1440
11th to 20thNight
24%38%9%15%12%1
1440
21st to endNight
26%38%10%16%9%1
1440
July1st to 10thNight
20%39%8%17%15%1
1400
11th to 20thNight
22%40%10%16%11%2
1392
21st to endNight
21%39%11%16%12%1
1672
August1st to 10thNight
25%40%9%17%8%1
1600
11th to 20thNight
21%39%10%20%10%1
1598
21st to endNight
22%38%9%19%10%2
1872
September1st to 10thNight
27%38%7%16%10%1
1800
11th to 20thNight
22%38%9%22%9%
1902
21st to endNight
31%38%8%14%8%
2017
October1st to 10thNight
31%38%7%15%8%1
2160
11th to 20thNight
36%38%9%12%5%
2160
21st to endNight
39%38%8%9%5%1
2376
November1st to 10thNight
26%42%8%16%7%1
2432
11th to 20thNight
33%41%10%10%6%
2660
21st to endNight
36%42%10%10%2
2660
December1st to 10thNight
43%44%7%6%1
2660
11th to 20thNight
45%36%9%8%2
3288
21st to endNight
60%28%8%31
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
22%18%35%17%8%1
180
11th to 20thDay
25%22%31%15%6%1
260
21st to endDay
19%21%31%24%41
267
February1st to 10thDay
24%19%43%13%1
240
11th to 20thDay
25%20%40%15%1
240
21st to endDay
28%22%33%16%1
224
March1st to 10thDay
21%13%38%22%6%
420
11th to 20thDay
22%14%35%21%6%1
420
21st to endDay
27%11%30%22%9%1
462
April1st to 10thDay
20%15%29%26%9%1
420
11th to 20thDay
24%14%24%21%12%4
412
21st to endDay
23%9%31%25%9%2
420
May1st to 10thDay
22%9%26%27%12%4
423
11th to 20thDay
19%7%21%27%22%4
447
21st to endDay
13%6%20%32%21%8%
485
June1st to 10thDay
15%6%27%34%15%3
450
11th to 20thDay
13%6%25%30%23%4
450
21st to endDay
14%5%24%33%20%5%
450
July1st to 10thDay
8%314%33%31%11%
445
11th to 20thDay
15%5%19%28%23%10%
444
21st to endDay
9%5%23%34%22%8%
488
August1st to 10thDay
10%219%30%27%13%
446
11th to 20thDay
10%5%20%28%25%13%
439
21st to endDay
14%419%30%22%13%
495
September1st to 10thDay
14%5%21%26%22%10%
450
11th to 20thDay
9%6%16%25%28%16%
450
21st to endDay
15%10%25%25%17%9%
450
October1st to 10thDay
22%10%23%20%18%7%
450
11th to 20thDay
21%16%31%20%9%2
450
21st to endDay
33%14%24%20%9%
495
November1st to 10thDay
18%19%30%21%9%3
293
11th to 20thDay
23%19%29%20%7%2
180
21st to endDay
29%18%32%17%4
180
December1st to 10thDay
25%19%34%16%41
180
11th to 20thDay
27%24%32%14%3
180
21st to endDay
25%20%37%16%3
198
January1st to 10thNight
26%18%33%16%7%
760
11th to 20thNight
27%18%32%19%4
760
21st to endNight
19%13%37%25%6%
800
February1st to 10thNight
26%18%35%20%2
720
11th to 20thNight
21%16%34%24%4
703
21st to endNight
23%15%36%24%2
592
March1st to 10thNight
20%12%34%26%7%
720
11th to 20thNight
24%13%32%23%8%
720
21st to endNight
20%8%32%29%11%1
792
April1st to 10thNight
22%11%31%30%5%1
720
11th to 20thNight
19%10%33%26%11%1
677
21st to endNight
19%7%28%35%11%
540
May1st to 10thNight
18%6%25%32%18%2
540
11th to 20thNight
15%426%40%15%1
390
21st to endNight
14%423%33%23%3
389
June1st to 10thNight
13%330%35%18%1
360
11th to 20thNight
14%325%37%21%1
360
21st to endNight
10%421%47%16%1
360
July1st to 10thNight
6%319%44%26%2
350
11th to 20thNight
10%223%40%23%3
348
21st to endNight
11%316%44%23%2
591
August1st to 10thNight
9%313%37%33%4
537
11th to 20thNight
9%117%31%37%3
534
21st to endNight
11%119%38%28%3
684
September1st to 10thNight
14%418%34%24%5%
720
11th to 20thNight
13%5%16%31%29%6%
720
21st to endNight
16%7%20%31%21%5%
720
October1st to 10thNight
19%7%24%28%20%3
720
11th to 20thNight
23%13%29%25%9%1
720
21st to endNight
29%11%28%25%6%
792
November1st to 10thNight
21%10%29%26%11%1
740
11th to 20thNight
20%15%35%21%8%2
760
21st to endNight
24%14%35%21%6%1
760
December1st to 10thNight
29%18%30%18%5%
760
11th to 20thNight
23%19%34%19%5%
760
21st to endNight
29%15%33%21%2
836
Page generated at 2024-01-19 09:28:34. Version ac07

Copyright 2024 Attilla Danko


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