Oneida
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Oneida clear sky chart from 2005-11-06 to 2024-01-17.

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
43%
23756
19%
74632
14%
23700
49%
23700
22%
49295

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
20%
760
16%
2459
10%
757
29%
757
14%
1724
January11th to 20thNight
18%
748
14%
2430
8%
748
26%
748
11%
1842
January21st to endNight
21%
792
19%
2570
8%
792
33%
792
16%
1777
February1st to 10thNight
20%
720
16%
2160
7%
720
28%
720
16%
1575
February11th to 20thNight
14%
703
15%
2099
6%
700
22%
700
14%
1550
February21st to endNight
17%
592
18%
1776
8%
592
25%
592
13%
1324
March1st to 10thNight
25%
720
19%
2136
9%
720
34%
720
20%
1476
March11th to 20thNight
26%
720
16%
1980
8%
720
32%
720
18%
1427
March21st to endNight
30%
792
14%
2178
8%
792
35%
792
19%
1556
April1st to 10thNight
35%
622
23%
1882
13%
622
46%
622
26%
1175
April11th to 20thNight
36%
533
24%
1775
15%
533
48%
533
24%
1095
April21st to endNight
37%
540
22%
1620
12%
540
46%
540
24%
1058
May1st to 10thNight
43%
540
19%
1620
10%
540
49%
540
26%
1049
May11th to 20thNight
51%
531
16%
1593
11%
531
54%
531
24%
1058
May21st to endNight
59%
582
16%
1745
11%
582
63%
582
26%
1137
June1st to 10thNight
64%
540
18%
1620
15%
540
66%
540
29%
1027
June11th to 20thNight
71%
540
18%
1620
15%
540
74%
540
37%
939
June21st to endNight
67%
540
16%
1620
14%
540
68%
540
29%
1009
July1st to 10thNight
67%
525
12%
1575
11%
525
68%
525
26%
1038
July11th to 20thNight
73%
522
17%
1566
15%
522
75%
522
32%
965
July21st to endNight
69%
591
17%
1672
16%
558
71%
558
28%
1068
August1st to 10thNight
71%
537
18%
1600
17%
534
71%
534
30%
1006
August11th to 20thNight
69%
534
17%
1666
17%
534
71%
534
29%
1033
August21st to endNight
72%
594
21%
1980
23%
594
72%
594
29%
1172
September1st to 10thNight
67%
656
21%
1916
19%
656
69%
656
30%
1216
September11th to 20thNight
61%
720
23%
1980
20%
720
62%
720
30%
1281
September21st to endNight
59%
720
28%
1980
22%
720
63%
720
35%
1212
October1st to 10thNight
60%
720
30%
1980
26%
720
63%
720
38%
1150
October11th to 20thNight
45%
720
26%
2096
19%
720
53%
720
30%
1303
October21st to endNight
43%
792
28%
2446
22%
792
53%
792
28%
1501
November1st to 10thNight
50%
740
27%
2406
26%
740
57%
740
29%
1400
November11th to 20thNight
37%
760
26%
2470
18%
760
49%
760
26%
1496
November21st to endNight
35%
760
23%
2470
16%
760
46%
760
22%
1595
December1st to 10thNight
26%
760
16%
2470
10%
760
34%
760
15%
1796
December11th to 20thNight
30%
759
19%
2991
13%
759
40%
759
14%
2048
December21st to endNight
24%
831
10%
4485
10%
817
33%
817
7%
3217

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%8%36%6%35%5%6%8%36%
74908
Night
14%8%36%5%35%5%5%7%40%
74936
TransparencyDay
45%8%11%20%14%3
74631
Night
43%7%11%20%16%3
74732
SeeingDay
21%13%23%21%15%7%
13648
Night
19%11%21%28%18%3
23764

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
17%10%5%8%6%34446%31%
1706
11th to 20thDay
19%13%5%11%6%3443427%
1674
21st to endDay
16%11%46%43445%6%37%
1785
February1st to 10thDay
18%12%6%7%5%35%45%6%30%
1800
11th to 20thDay
22%11%5%7%6%33346%30%
1748
21st to endDay
22%12%47%424345%32%
1480
March1st to 10thDay
15%12%35%5%35%446%37%
1822
11th to 20thDay
22%9%47%5%35%45%5%31%
1980
21st to endDay
17%11%47%6%26%45%6%32%
2178
April1st to 10thDay
13%7%35%5%3446%9%40%
2092
11th to 20thDay
16%7%35%5%25%447%41%
2134
21st to endDay
16%6%26%6%35%6%6%7%37%
2339
May1st to 10thDay
16%6%36%5%46%5%6%8%36%
2340
11th to 20thDay
15%7%46%7%45%5%5%7%34%
2301
21st to endDay
10%6%36%7%35%6%7%9%37%
2531
June1st to 10thDay
11%6%36%7%47%6%6%9%36%
2340
11th to 20thDay
6%5%36%6%5%6%6%7%10%39%
2340
21st to endDay
8%5%25%6%46%7%7%12%37%
2340
July1st to 10thDay
11%6%37%8%5%8%7%9%10%28%
2340
11th to 20thDay
11%436%8%5%8%7%7%10%31%
2340
21st to endDay
11%7%36%7%46%6%8%10%31%
2547
August1st to 10thDay
11%5%36%7%47%7%7%11%32%
2327
11th to 20thDay
12%6%36%7%47%6%7%10%33%
2231
21st to endDay
11%6%25%7%5%6%6%7%10%35%
2376
September1st to 10thDay
15%6%35%5%36%5%6%7%39%
2026
11th to 20thDay
14%5%36%6%45%5%6%8%38%
1980
21st to endDay
15%5%25%335%5%5%6%47%
1980
October1st to 10thDay
11%6%2443445%6%51%
1980
11th to 20thDay
14%6%25%434446%49%
1864
21st to endDay
18%6%3442345%7%45%
1908
November1st to 10thDay
12%6%24323447%53%
1672
11th to 20thDay
13%8%35%42445%6%46%
1710
21st to endDay
15%9%45%5%24346%42%
1710
December1st to 10thDay
20%12%37%6%34436%32%
1710
11th to 20thDay
15%13%47%5%45%5%5%5%32%
2153
21st to endDay
15%16%46%6%345%6%7%28%
3124
January1st to 10thNight
17%11%39%7%34445%34%
2459
11th to 20thNight
19%14%6%9%6%345%35%27%
2430
21st to endNight
15%12%6%8%5%34445%36%
2570
February1st to 10thNight
19%9%48%6%345%5%6%30%
2160
11th to 20thNight
22%11%5%7%6%24445%32%
2098
21st to endNight
23%12%5%7%5%34346%29%
1776
March1st to 10thNight
17%10%46%4345%5%5%38%
2136
11th to 20thNight
18%10%46%5%35%5%5%6%34%
1980
21st to endNight
15%10%47%5%35%5%5%7%34%
2178
April1st to 10thNight
13%6%344345%5%8%45%
1882
11th to 20thNight
15%7%26%433447%45%
1775
21st to endNight
15%7%25%6%3446%7%41%
1620
May1st to 10thNight
14%6%35%435%5%6%8%41%
1620
11th to 20thNight
14%6%35%6%45%6%6%8%39%
1592
21st to endNight
7%436%5%47%48%10%42%
1744
June1st to 10thNight
7%5%26%6%47%5%6%10%42%
1620
11th to 20thNight
43135%36%6%7%11%49%
1620
21st to endNight
6%425%6%45%7%7%13%40%
1620
July1st to 10thNight
10%5%245%45%7%8%10%40%
1620
11th to 20thNight
7%4245%36%6%8%9%45%
1620
21st to endNight
8%326%7%47%6%8%11%38%
1771
August1st to 10thNight
8%5%25%5%446%7%11%43%
1611
11th to 20thNight
8%5%36%6%35%5%7%9%42%
1666
21st to endNight
9%5%14445%5%6%11%45%
1980
September1st to 10thNight
11%6%244345%6%9%45%
1916
11th to 20thNight
12%6%25%6%2446%7%46%
1980
21st to endNight
11%5%25%43345%5%53%
1980
October1st to 10thNight
11%5%24323346%57%
1980
11th to 20thNight
17%5%245%24446%49%
2096
21st to endNight
15%8%24424436%47%
2446
November1st to 10thNight
11%7%35%423346%52%
2406
11th to 20thNight
13%7%34434447%46%
2470
21st to endNight
15%10%46%423445%43%
2470
December1st to 10thNight
18%13%5%6%5%3445%6%30%
2470
11th to 20thNight
16%11%6%10%5%24345%35%
3042
21st to endNight
16%13%5%8%7%5%6%6%5%6%23%
4532

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
54%6%7%16%14%3
1707
11th to 20thDay
61%48%14%12%2
1674
21st to endDay
47%5%10%21%16%1
1785
February1st to 10thDay
56%5%7%16%15%1
1800
11th to 20thDay
58%47%19%10%3
1758
21st to endDay
55%49%14%14%5%
1480
March1st to 10thDay
49%5%6%20%17%4
1822
11th to 20thDay
54%6%8%17%12%2
1980
21st to endDay
52%6%9%20%11%1
2178
April1st to 10thDay
41%7%10%24%15%3
2092
11th to 20thDay
43%5%8%18%22%3
2134
21st to endDay
45%8%10%24%12%2
2339
May1st to 10thDay
45%8%11%24%10%1
2340
11th to 20thDay
48%9%12%19%10%1
2305
21st to endDay
41%11%14%22%11%2
2531
June1st to 10thDay
43%9%13%21%13%1
2340
11th to 20thDay
36%11%16%20%15%2
2340
21st to endDay
37%12%15%19%13%4
2340
July1st to 10thDay
46%11%13%18%9%2
2275
11th to 20thDay
44%11%15%16%11%3
2271
21st to endDay
43%12%15%20%9%1
2405
August1st to 10thDay
42%12%18%19%8%
2314
11th to 20thDay
44%10%15%18%13%1
2231
21st to endDay
43%11%13%18%12%3
2376
September1st to 10thDay
43%8%10%18%17%3
2026
11th to 20thDay
44%7%11%19%16%2
1980
21st to endDay
36%8%10%22%20%4
1980
October1st to 10thDay
33%5%10%23%24%5%
1980
11th to 20thDay
35%5%10%20%24%6%
1864
21st to endDay
39%48%24%20%5%
1908
November1st to 10thDay
32%5%9%23%28%4
1672
11th to 20thDay
39%5%6%22%22%6%
1710
21st to endDay
44%5%8%19%21%3
1710
December1st to 10thDay
55%5%7%20%12%2
1710
11th to 20thDay
52%6%9%16%15%2
2150
21st to endDay
52%5%11%21%10%1
3124
January1st to 10thNight
53%49%17%14%3
2459
11th to 20thNight
61%48%13%12%3
2430
21st to endNight
52%48%20%14%2
2570
February1st to 10thNight
53%6%10%18%12%1
2160
11th to 20thNight
56%46%18%12%4
2099
21st to endNight
58%38%14%13%3
1776
March1st to 10thNight
48%5%8%16%18%5%
2136
11th to 20thNight
51%6%10%19%13%2
1980
21st to endNight
49%6%11%21%11%2
2178
April1st to 10thNight
37%6%10%25%19%3
1882
11th to 20thNight
39%6%9%20%21%5%
1775
21st to endNight
42%7%10%29%12%1
1620
May1st to 10thNight
39%7%14%25%12%2
1620
11th to 20thNight
40%10%16%23%11%1
1593
21st to endNight
35%13%15%25%11%1
1745
June1st to 10thNight
37%8%14%25%14%2
1620
11th to 20thNight
25%11%20%26%16%1
1620
21st to endNight
33%10%17%22%13%3
1620
July1st to 10thNight
36%13%18%20%12%2
1575
11th to 20thNight
32%10%20%19%15%4
1566
21st to endNight
34%12%18%24%11%1
1672
August1st to 10thNight
32%11%18%27%11%1
1600
11th to 20thNight
34%10%21%19%15%1
1666
21st to endNight
33%9%15%26%15%2
1980
September1st to 10thNight
34%10%14%20%17%5%
1916
11th to 20thNight
36%8%12%23%19%2
1980
21st to endNight
32%7%9%22%25%4
1980
October1st to 10thNight
29%5%9%23%27%6%
1980
11th to 20thNight
37%6%9%22%21%6%
2096
21st to endNight
38%47%21%24%6%
2446
November1st to 10thNight
35%5%6%22%24%7%
2406
11th to 20thNight
39%48%19%23%7%
2470
21st to endNight
44%46%24%19%3
2470
December1st to 10thNight
56%5%8%18%11%2
2470
11th to 20thNight
52%47%16%17%3
3044
21st to endNight
57%7%11%14%11%
4532

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
31%25%31%11%11
270
11th to 20thDay
41%28%18%10%3
258
21st to endDay
30%30%29%8%2
264
February1st to 10thDay
35%25%27%11%2
240
11th to 20thDay
48%25%22%5%
240
21st to endDay
44%20%32%32
198
March1st to 10thDay
28%28%33%10%1
262
11th to 20thDay
30%24%25%16%41
420
21st to endDay
29%21%26%17%6%1
462
April1st to 10thDay
28%15%27%19%10%1
420
11th to 20thDay
21%18%31%17%11%2
412
21st to endDay
24%14%32%17%12%1
420
May1st to 10thDay
23%16%29%18%9%4
423
11th to 20thDay
15%12%27%25%13%8%
447
21st to endDay
15%8%21%24%21%12%
485
June1st to 10thDay
14%6%23%25%22%10%
450
11th to 20thDay
9%5%19%30%24%13%
450
21st to endDay
9%6%26%28%20%11%
450
July1st to 10thDay
14%416%22%26%19%
445
11th to 20thDay
9%6%17%26%24%18%
444
21st to endDay
14%413%30%25%14%
488
August1st to 10thDay
14%316%27%25%15%
446
11th to 20thDay
14%5%15%31%23%12%
439
21st to endDay
14%310%29%27%16%
495
September1st to 10thDay
14%316%24%31%13%
450
11th to 20thDay
14%5%12%26%30%12%
450
21st to endDay
18%5%18%30%22%8%
450
October1st to 10thDay
14%8%21%27%22%7%
450
11th to 20thDay
18%14%26%26%15%2
450
21st to endDay
26%11%28%24%11%1
423
November1st to 10thDay
21%12%36%21%9%2
270
11th to 20thDay
23%17%39%17%3
270
21st to endDay
21%19%35%17%8%
270
December1st to 10thDay
33%21%29%13%4
270
11th to 20thDay
27%21%31%14%5%1
270
21st to endDay
31%24%33%10%2
297
January1st to 10thNight
24%23%28%20%5%
760
11th to 20thNight
30%22%24%20%4
748
21st to endNight
24%19%34%21%3
792
February1st to 10thNight
26%19%31%22%2
720
11th to 20thNight
30%20%33%16%1
703
21st to endNight
33%21%28%17%2
592
March1st to 10thNight
24%17%30%25%5%
720
11th to 20thNight
26%17%28%22%6%1
720
21st to endNight
26%14%25%27%8%
792
April1st to 10thNight
19%15%27%27%11%
622
11th to 20thNight
20%12%28%27%13%1
533
21st to endNight
18%8%30%31%11%2
540
May1st to 10thNight
17%9%26%30%16%2
540
11th to 20thNight
15%7%18%35%21%4
531
21st to endNight
8%220%31%33%6%
584
June1st to 10thNight
10%315%35%33%5%
540
11th to 20thNight
4115%37%34%8%
540
21st to endNight
8%312%41%29%8%
540
July1st to 10thNight
12%19%28%41%9%
525
11th to 20thNight
8%210%27%44%10%
522
21st to endNight
8%19%31%42%8%
591
August1st to 10thNight
12%28%27%44%7%
537
11th to 20thNight
12%19%33%39%7%
534
21st to endNight
12%17%30%40%11%
594
September1st to 10thNight
13%29%26%41%9%
656
11th to 20thNight
14%311%29%37%7%
720
21st to endNight
14%316%32%28%6%
720
October1st to 10thNight
12%7%16%27%31%7%
720
11th to 20thNight
20%8%21%30%18%2
720
21st to endNight
18%11%23%30%15%2
792
November1st to 10thNight
16%10%19%34%18%3
740
11th to 20thNight
18%16%26%30%10%2
760
21st to endNight
22%14%25%29%9%
760
December1st to 10thNight
28%17%24%25%6%
760
11th to 20thNight
24%16%26%27%6%1
760
21st to endNight
29%16%25%25%4
836
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