Oneida
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Oneida clear sky chart from 2005-11-05 to 2017-04-28.

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
44%
14991
20%
45633
14%
14948
50%
14948
23%
29982

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
20%
720
16%
2327
10%
716
28%
716
14%
1647
January16th to endNight
20%
768
18%
2493
8%
768
31%
768
15%
1763
February1st to 15thNight
19%
704
16%
2112
6%
701
29%
701
17%
1510
February16th to endNight
16%
631
19%
1893
9%
631
25%
631
15%
1366
March1st to 15thNight
25%
720
17%
2084
10%
720
32%
720
18%
1476
March16th to endNight
33%
768
14%
2112
9%
768
37%
768
20%
1506
April1st to 15thNight
36%
593
23%
1851
13%
593
49%
593
26%
1142
April16th to endNight
40%
534
21%
1662
12%
534
48%
534
23%
1074
May1st to 15thNight
46%
494
18%
1485
11%
494
52%
494
24%
995
May16th to endNight
58%
513
16%
1540
11%
513
60%
513
26%
999
June1st to 15thNight
66%
495
17%
1485
14%
495
69%
495
30%
945
June16th to endNight
74%
495
16%
1485
15%
495
75%
495
32%
895
July1st to 15thNight
67%
465
13%
1395
12%
465
69%
465
27%
918
July16th to endNight
72%
522
15%
1469
14%
489
74%
489
30%
911
August1st to 15thNight
76%
494
22%
1474
20%
491
76%
491
35%
867
August16th to endNight
74%
525
19%
1737
21%
525
75%
525
29%
1029
September1st to 15thNight
65%
621
21%
1776
19%
621
66%
621
28%
1155
September16th to endNight
60%
657
25%
1815
21%
657
62%
657
32%
1143
October1st to 15thNight
56%
660
33%
1831
28%
660
60%
660
37%
1071
October16th to endNight
45%
704
28%
2155
21%
704
55%
704
30%
1310
November1st to 15thNight
46%
700
27%
2276
25%
700
54%
700
29%
1326
November16th to endNight
35%
720
23%
2340
16%
720
46%
720
22%
1498
December1st to 15thNight
32%
720
17%
2340
13%
720
39%
720
16%
1653
December16th to endNight
26%
768
18%
2496
11%
768
35%
768
14%
1783

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%7%36%5%35%5%5%7%35%
46063
Night
13%7%35%5%2445%7%40%
45830
TransparencyDay
46%7%10%18%14%2
45764
Night
42%6%11%20%16%3
45633
SeeingDay
18%9%20%20%19%11%
4738
Night
17%10%21%27%19%3
14994

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 15thDay
17%12%410%6%24445%28%
1611
16th to endDay
17%10%36%423445%36%
1730
February1st to 15thDay
16%12%5%7%6%24345%30%
1750
16th to endDay
17%11%5%7%434447%31%
1580
March1st to 15thDay
19%10%35%425%445%33%
1875
16th to endDay
17%11%46%5%26%45%5%31%
2111
April1st to 15thDay
13%6%345%2446%7%40%
2106
16th to endDay
16%6%26%5%25%446%37%
2245
May1st to 15thDay
15%6%36%6%47%45%8%31%
2136
16th to endDay
11%6%35%6%35%5%6%8%36%
2223
June1st to 15thDay
8%6%26%6%47%6%5%9%34%
2145
16th to endDay
7%435%6%46%6%7%10%35%
2145
July1st to 15thDay
13%5%35%8%48%6%8%9%26%
2145
16th to endDay
10%6%26%7%48%7%8%10%27%
2283
August1st to 15thDay
9%5%26%7%47%6%7%10%32%
2145
16th to endDay
11%425%6%5%6%5%7%10%33%
2110
September1st to 15thDay
15%6%36%5%36%5%5%6%32%
1843
16th to endDay
16%415%435%45%5%42%
1815
October1st to 15thDay
11%6%14434346%50%
1799
16th to endDay
17%424414345%47%
1716
November1st to 15thDay
13%6%1332345%7%48%
1582
16th to endDay
15%9%24323246%44%
1620
December1st to 15thDay
19%9%37%5%24436%33%
1620
16th to endDay
17%11%46%5%3335%5%31%
1728
January1st to 15thNight
17%10%39%6%2433433%
2327
16th to endNight
16%11%5%8%5%23435%33%
2493
February1st to 15thNight
16%10%47%5%34446%32%
2103
16th to endNight
17%11%5%7%5%24336%33%
1893
March1st to 15thNight
16%10%36%5%34445%35%
2084
16th to endNight
15%9%36%5%35%446%35%
2112
April1st to 15thNight
13%5%2432345%7%45%
1851
16th to endNight
12%6%26%5%3445%6%41%
1662
May1st to 15thNight
12%6%36%5%245%6%8%37%
1484
16th to endNight
8%3345%36%5%6%10%42%
1538
June1st to 15thNight
5%425%5%37%6%6%10%42%
1485
16th to endNight
43135%35%7%7%13%43%
1485
July1st to 15thNight
9%4245%35%7%7%8%40%
1485
16th to endNight
6%315%5%37%6%8%11%40%
1577
August1st to 15thNight
5%3243345%8%12%46%
1485
16th to endNight
7%4145%36%6%6%11%43%
1737
September1st to 15thNight
10%5%245%345%6%9%43%
1776
16th to endNight
10%5%15%5%33445%49%
1815
October1st to 15thNight
12%413313347%54%
1831
16th to endNight
14%6%24323335%50%
2155
November1st to 15thNight
11%6%24423337%49%
2276
16th to endNight
15%8%3442343444%
2340
December1st to 15thNight
18%10%5%6%423345%33%
2340
16th to endNight
19%10%37%5%24335%31%
2496

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
57%47%14%13%2
1612
16th to endDay
49%410%21%13%1
1730
February1st to 15thDay
56%46%17%12%1
1752
16th to endDay
52%411%18%11%1
1580
March1st to 15thDay
53%47%17%13%3
1875
16th to endDay
52%6%9%19%10%
2112
April1st to 15thDay
41%6%9%21%17%3
2106
16th to endDay
45%6%8%20%16%2
2245
May1st to 15thDay
50%8%10%18%9%
2136
16th to endDay
43%10%13%20%10%2
2227
June1st to 15thDay
43%9%14%19%10%1
2145
16th to endDay
38%11%13%18%14%3
2145
July1st to 15thDay
48%9%15%14%8%2
2006
16th to endDay
45%12%14%17%8%1
2128
August1st to 15thDay
42%11%15%18%11%1
2132
16th to endDay
44%9%13%16%14%1
2110
September1st to 15thDay
49%7%10%14%13%3
1843
16th to endDay
41%7%8%18%20%2
1815
October1st to 15thDay
35%39%21%23%6%
1799
16th to endDay
38%37%21%23%4
1716
November1st to 15thDay
35%46%21%25%6%
1582
16th to endDay
41%46%22%20%3
1620
December1st to 15thDay
51%5%8%18%12%3
1620
16th to endDay
54%411%16%11%1
1728
January1st to 15thNight
54%39%15%14%2
2327
16th to endNight
53%38%18%13%2
2493
February1st to 15thNight
52%5%9%19%11%2
2112
16th to endNight
54%37%20%12%1
1893
March1st to 15thNight
50%5%9%17%13%3
2084
16th to endNight
49%5%11%21%10%1
2112
April1st to 15thNight
37%5%9%24%18%4
1851
16th to endNight
41%6%8%23%16%3
1662
May1st to 15thNight
41%8%14%22%11%1
1485
16th to endNight
35%12%15%23%11%1
1540
June1st to 15thNight
34%9%17%22%14%1
1485
16th to endNight
29%10%17%25%13%3
1485
July1st to 15thNight
36%11%17%18%13%2
1395
16th to endNight
32%10%20%21%12%2
1469
August1st to 15thNight
27%10%18%24%17%1
1474
16th to endNight
32%8%17%22%15%2
1737
September1st to 15thNight
36%9%14%19%14%4
1776
16th to endNight
35%6%9%18%26%2
1815
October1st to 15thNight
30%410%22%25%6%
1831
16th to endNight
37%45%20%25%6%
2155
November1st to 15thNight
36%35%20%26%8%
2276
16th to endNight
43%46%21%19%3
2340
December1st to 15thNight
53%48%17%13%3
2340
16th to endNight
55%39%14%14%1
2496

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
28%33%24%10%12
90
16th to endDay
27%32%35%221
96
February1st to 15thDay
36%21%32%10%
90
16th to endDay
34%20%35%7%1
81
March1st to 15thDay
30%25%24%15%2
165
16th to endDay
20%14%30%21%10%2
288
April1st to 15thDay
20%16%23%23%14%1
270
16th to endDay
22%6%27%22%18%3
259
May1st to 15thDay
18%14%24%19%13%10%
228
16th to endDay
14%417%27%16%18%
267
June1st to 15thDay
10%313%25%29%17%
255
16th to endDay
7%416%24%28%17%
255
July1st to 15thDay
20%417%20%18%18%
245
16th to endDay
12%27%20%28%28%
270
August1st to 15thDay
13%9%19%28%28%
253
16th to endDay
15%17%22%30%22%
268
September1st to 15thDay
13%19%17%40%17%
255
16th to endDay
18%212%25%27%12%
254
October1st to 15thDay
14%6%23%23%21%10%
255
16th to endDay
18%9%21%25%22%2
228
November1st to 15thDay
24%12%27%21%12%2
90
16th to endDay
26%15%37%13%5%1
90
December1st to 15thDay
27%20%32%14%41
90
16th to endDay
31%23%36%7%1
96
January1st to 15thNight
24%22%27%18%5%
720
16th to endNight
23%19%31%23%2
768
February1st to 15thNight
24%17%34%21%1
704
16th to endNight
26%20%33%17%1
631
March1st to 15thNight
25%15%29%24%5%
720
16th to endNight
22%11%27%25%11%1
768
April1st to 15thNight
19%13%27%26%12%
593
16th to endNight
16%8%28%30%13%1
534
May1st to 15thNight
15%6%24%31%18%3
495
16th to endNight
8%318%30%29%8%
515
June1st to 15thNight
6%117%33%34%6%
495
16th to endNight
428%39%36%8%
495
July1st to 15thNight
12%9%34%35%6%
465
16th to endNight
7%8%26%43%13%
522
August1st to 15thNight
8%6%28%46%8%
494
16th to endNight
10%5%31%41%10%
525
September1st to 15thNight
12%110%25%39%10%
621
16th to endNight
14%214%29%32%6%
657
October1st to 15thNight
14%8%15%26%26%7%
660
16th to endNight
17%8%24%26%20%2
704
November1st to 15thNight
16%10%22%28%18%4
700
16th to endNight
21%15%24%28%9%
720
December1st to 15thNight
25%16%22%25%8%1
720
16th to endNight
27%16%23%26%5%
768
Page generated at 2017-04-29 09:45:00. Version ac04

Copyright 2017 A. Danko


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