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 2017-10-31.

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
45%
15601
20%
47444
15%
15558
51%
15558
24%
31054

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%
540
21%
1680
12%
540
48%
540
24%
1082
May1st to 15thNight
46%
539
18%
1620
11%
539
52%
539
24%
1079
May16th to endNight
57%
561
16%
1684
11%
561
60%
561
25%
1093
June1st to 15thNight
67%
540
16%
1620
13%
540
70%
540
31%
1016
June16th to endNight
73%
540
17%
1620
16%
540
74%
540
32%
984
July1st to 15thNight
69%
510
12%
1530
11%
510
70%
510
27%
1004
July16th to endNight
72%
564
17%
1595
16%
531
75%
531
31%
972
August1st to 15thNight
75%
539
20%
1609
19%
536
76%
536
34%
962
August16th to endNight
75%
573
20%
1896
22%
573
75%
573
29%
1124
September1st to 15thNight
64%
678
20%
1938
17%
678
65%
678
29%
1256
September16th to endNight
62%
717
28%
1980
23%
717
64%
717
34%
1221
October1st to 15thNight
58%
720
32%
1998
28%
720
61%
720
38%
1168
October16th to endNight
45%
768
29%
2350
23%
768
55%
768
30%
1423
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%35%5%35%5%5%7%35%
48307
Night
13%7%35%5%2445%7%41%
47641
TransparencyDay
45%7%10%18%14%2
48008
Night
42%6%11%20%16%3
47444
SeeingDay
18%8%20%21%19%11%
5473
Night
17%10%21%27%19%3
15604

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
15%6%26%5%25%447%37%
2280
May1st to 15thDay
16%6%36%6%46%447%33%
2331
16th to endDay
12%6%35%6%35%5%6%8%36%
2431
June1st to 15thDay
8%6%26%7%47%6%5%9%35%
2340
16th to endDay
7%425%6%46%6%7%10%36%
2340
July1st to 15thDay
12%5%35%8%5%8%6%7%9%26%
2340
16th to endDay
10%5%25%7%47%7%8%10%29%
2465
August1st to 15thDay
9%5%26%7%46%6%7%10%32%
2340
16th to endDay
11%425%6%5%6%5%7%10%33%
2303
September1st to 15thDay
16%6%36%5%36%5%5%6%32%
2010
16th to endDay
14%415%435%5%5%6%43%
1980
October1st to 15thDay
11%5%14434346%50%
1962
16th to endDay
16%5%24413345%48%
1872
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%25%5%3445%7%42%
1680
May1st to 15thNight
12%5%36%5%2446%8%38%
1619
16th to endNight
8%325%5%36%5%6%10%41%
1682
June1st to 15thNight
5%415%5%37%5%6%10%43%
1620
16th to endNight
5%3146%35%7%7%12%42%
1620
July1st to 15thNight
9%4245%35%7%8%8%40%
1620
16th to endNight
6%215%5%36%6%7%10%42%
1703
August1st to 15thNight
6%3243346%8%11%45%
1620
16th to endNight
7%414436%6%6%11%43%
1896
September1st to 15thNight
11%5%245%2446%8%43%
1938
16th to endNight
9%5%15%42345%5%52%
1980
October1st to 15thNight
12%413313346%54%
1998
16th to endNight
14%6%24323335%50%
2350
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%15%2
2280
May1st to 15thDay
49%8%10%19%10%1
2331
16th to endDay
43%10%13%20%10%2
2435
June1st to 15thDay
43%9%14%20%11%1
2340
16th to endDay
38%11%13%18%14%4
2340
July1st to 15thDay
48%10%14%14%9%2
2201
16th to endDay
44%11%13%17%10%2
2310
August1st to 15thDay
43%11%15%17%11%1
2327
16th to endDay
44%9%13%16%14%1
2303
September1st to 15thDay
50%7%9%15%13%3
2010
16th to endDay
39%8%10%18%20%2
1980
October1st to 15thDay
34%410%22%23%5%
1962
16th to endDay
37%38%21%24%4
1872
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%9%23%15%3
1680
May1st to 15thNight
41%8%13%23%11%1
1620
16th to endNight
36%11%15%23%11%1
1684
June1st to 15thNight
34%8%17%23%14%1
1620
16th to endNight
30%10%16%24%14%3
1620
July1st to 15thNight
35%12%17%18%13%2
1530
16th to endNight
31%10%19%22%14%3
1595
August1st to 15thNight
28%10%18%23%16%1
1609
16th to endNight
32%8%16%23%15%2
1896
September1st to 15thNight
37%8%14%20%15%4
1938
16th to endNight
32%6%9%20%27%2
1980
October1st to 15thNight
30%410%22%25%6%
1998
16th to endNight
37%35%20%25%6%
2350
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
21%7%29%21%17%3
270
May1st to 15thDay
21%13%25%18%12%7%
288
16th to endDay
16%5%21%26%13%16%
331
June1st to 15thDay
10%313%26%29%17%
315
16th to endDay
9%5%19%24%25%15%
315
July1st to 15thDay
17%317%22%20%17%
305
16th to endDay
12%27%24%27%25%
326
August1st to 15thDay
15%11%22%26%23%
313
16th to endDay
15%9%25%29%19%
332
September1st to 15thDay
16%410%18%35%14%
315
16th to endDay
15%112%27%28%14%
314
October1st to 15thDay
13%5%22%23%26%8%
315
16th to endDay
18%10%21%24%22%2
288
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%29%30%13%1
540
May1st to 15thNight
16%7%23%32%17%2
540
16th to endNight
8%319%31%28%8%
563
June1st to 15thNight
7%116%33%34%7%
540
16th to endNight
5%28%40%35%7%
540
July1st to 15thNight
11%9%33%38%7%
510
16th to endNight
7%7%26%45%12%
564
August1st to 15thNight
9%6%28%46%7%
539
16th to endNight
10%5%31%41%9%
573
September1st to 15thNight
14%210%25%38%9%
678
16th to endNight
13%213%28%34%7%
717
October1st to 15thNight
14%7%15%26%29%6%
720
16th to endNight
17%9%23%26%20%2
768
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 2017-11-01 17:23:34. Version ac04

Copyright 2017 A. Danko


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