Kenosha Pass
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kenosha Pass clear sky chart from 2005-11-05 to 2017-09-17.

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
40%
15923
27%
46880
12%
15877
54%
15877
38%
24516

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
27%
899
30%
2506
9%
895
46%
895
38%
1218
January16th to endNight
25%
770
34%
2498
12%
770
50%
770
40%
1146
February1st to 15thNight
23%
700
26%
2267
7%
696
45%
696
33%
1113
February16th to endNight
25%
632
33%
1894
8%
632
50%
632
40%
909
March1st to 15thNight
30%
720
28%
2082
9%
720
47%
720
38%
1075
March16th to endNight
27%
699
26%
2043
9%
699
43%
699
37%
1095
April1st to 15thNight
29%
539
25%
1798
9%
539
49%
539
34%
881
April16th to endNight
33%
540
24%
1800
13%
540
50%
540
31%
960
May1st to 15thNight
37%
539
19%
1620
9%
539
48%
539
29%
989
May16th to endNight
46%
563
18%
1498
9%
561
55%
561
35%
885
June1st to 15thNight
54%
540
24%
1440
14%
540
62%
540
53%
718
June16th to endNight
67%
540
25%
1440
18%
540
72%
540
52%
744
July1st to 15thNight
69%
510
16%
1360
14%
510
71%
510
35%
837
July16th to endNight
70%
564
16%
1487
14%
531
71%
531
34%
882
August1st to 15thNight
67%
539
15%
1650
14%
536
69%
536
30%
979
August16th to endNight
66%
573
24%
1910
24%
573
70%
573
33%
1072
September1st to 15thNight
65%
540
27%
1800
23%
540
73%
540
34%
975
September16th to endNight
58%
517
33%
1793
25%
517
70%
517
43%
862
October1st to 15thNight
41%
660
31%
1980
14%
660
55%
660
44%
1013
October16th to endNight
41%
704
34%
2112
14%
704
57%
704
43%
1057
November1st to 15thNight
34%
875
33%
2275
11%
875
49%
875
49%
1153
November16th to endNight
32%
900
35%
2419
12%
900
49%
900
46%
1186
December1st to 15thNight
23%
900
24%
2520
5%
900
40%
900
35%
1310
December16th to endNight
23%
960
26%
2688
8%
960
39%
960
34%
1457

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
5%6%36%6%35%5%5%7%44%
47912
Night
242442445%8%57%
47059
TransparencyDay
34%413%24%17%5%
47593
Night
23%416%30%19%5%
46880
SeeingDay
15%16%26%23%13%3
5825
Night
6%13%32%29%14%2
15929

By Month

Percentage Cloud Cover SW (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
236%426%46%8%54%
1441
16th to endDay
4345%345%5%6%55%
1728
February1st to 15thDay
327%6%3446%9%50%
1595
16th to endDay
236%7%36%5%5%7%51%
1580
March1st to 15thDay
16%35%5%35%5%5%8%48%
1875
16th to endDay
27%47%6%35%45%8%43%
2181
April1st to 15thDay
28%37%6%35%5%5%8%43%
2150
16th to endDay
413%5%8%6%35%5%46%36%
2160
May1st to 15thDay
7%12%48%6%35%46%6%34%
2328
16th to endDay
7%11%37%6%35%5%47%34%
2616
June1st to 15thDay
6%7%26%5%35%5%5%7%44%
2520
16th to endDay
44245%35%6%7%8%48%
2520
July1st to 15thDay
9%7%37%6%46%5%7%7%32%
2520
16th to endDay
10%7%47%7%47%6%6%7%29%
2578
August1st to 15thDay
12%8%47%8%46%5%6%6%29%
2301
16th to endDay
9%7%46%7%46%5%6%5%36%
2292
September1st to 15thDay
10%6%25%6%34345%46%
2160
16th to endDay
45%25%5%35%346%52%
1871
October1st to 15thDay
6%5%245%3435%453%
1650
16th to endDay
35%25%5%23447%56%
1748
November1st to 15thDay
32332336%8%61%
1583
16th to endDay
32431335%10%62%
1539
December1st to 15thDay
325%425%5%5%9%54%
1440
16th to endDay
326%6%25%4411%52%
1536
January1st to 15thNight
11343446%10%61%
2506
16th to endNight
124322347%65%
2498
February1st to 15thNight
215%32446%8%60%
2257
16th to endNight
32432346%9%59%
1894
March1st to 15thNight
42442445%8%58%
2082
16th to endNight
25%35%323347%57%
2043
April1st to 15thNight
15%2442345%8%57%
1798
16th to endNight
38%25%33335%7%53%
1800
May1st to 15thNight
5%8%36%42445%8%45%
1619
16th to endNight
6%6%2442446%9%48%
1497
June1st to 15thNight
321321446%10%61%
1440
16th to endNight
221233445%8%61%
1440
July1st to 15thNight
5%4245%46%6%7%9%43%
1440
16th to endNight
5%426%446%6%7%8%43%
1589
August1st to 15thNight
5%6%26%435%5%6%8%45%
1659
16th to endNight
5%5%25%5%345%6%9%48%
1910
September1st to 15thNight
6%424436%46%8%50%
1800
16th to endNight
2324424446%61%
1793
October1st to 15thNight
4313323348%61%
1980
16th to endNight
1424213447%61%
2112
November1st to 15thNight
31221335%9%64%
2275
16th to endNight
313323449%64%
2419
December1st to 15thNight
314424349%60%
2520
16th to endNight
225%5%2445%8%57%
2688

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
23%323%30%15%3
1442
16th to endDay
24%317%31%17%5%
1728
February1st to 15thDay
25%421%32%13%3
1596
16th to endDay
27%313%30%20%3
1580
March1st to 15thDay
29%215%31%18%2
1875
16th to endDay
34%314%29%14%3
2181
April1st to 15thDay
34%315%26%15%4
2150
16th to endDay
44%212%25%12%2
2160
May1st to 15thDay
46%411%23%12%
2328
16th to endDay
44%5%13%22%11%3
2620
June1st to 15thDay
35%411%17%22%8%
2520
16th to endDay
29%5%8%22%23%9%
2520
July1st to 15thDay
45%6%12%14%13%7%
2371
16th to endDay
46%6%15%17%8%3
2417
August1st to 15thDay
50%5%12%13%12%5%
2286
16th to endDay
43%5%11%21%14%3
2292
September1st to 15thDay
37%410%17%20%9%
2160
16th to endDay
30%29%25%27%3
1871
October1st to 15thDay
29%47%25%28%5%
1650
16th to endDay
25%210%29%27%5%
1748
November1st to 15thDay
18%315%26%25%10%
1583
16th to endDay
17%214%33%24%7%
1539
December1st to 15thDay
23%422%32%15%1
1440
16th to endDay
24%5%20%27%15%4
1536
January1st to 15thNight
16%323%33%18%3
2506
16th to endNight
17%315%33%22%6%
2498
February1st to 15thNight
21%316%37%16%3
2267
16th to endNight
18%215%36%22%4
1894
March1st to 15thNight
20%414%35%21%3
2082
16th to endNight
24%415%35%17%3
2043
April1st to 15thNight
22%416%32%19%4
1798
16th to endNight
29%316%32%16%1
1800
May1st to 15thNight
36%5%16%26%14%1
1620
16th to endNight
30%5%18%27%14%3
1498
June1st to 15thNight
17%318%27%21%10%
1440
16th to endNight
19%413%26%24%12%
1440
July1st to 15thNight
31%7%17%21%14%7%
1360
16th to endNight
31%8%24%21%10%3
1487
August1st to 15thNight
32%8%19%19%14%5%
1650
16th to endNight
31%6%17%24%17%3
1910
September1st to 15thNight
29%5%13%25%17%8%
1800
16th to endNight
22%312%34%23%3
1793
October1st to 15thNight
21%311%30%25%6%
1980
16th to endNight
21%310%30%30%3
2112
November1st to 15thNight
15%414%28%27%9%
2275
16th to endNight
16%213%34%24%7%
2419
December1st to 15thNight
20%422%31%18%2
2520
16th to endNight
22%6%19%31%17%3
2688

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
22%13%27%17%15%3
90
16th to endDay
9%25%31%28%5%1
96
February1st to 15thDay
25%28%34%8%2
90
16th to endDay
17%29%25%19%6%1
81
March1st to 15thDay
21%24%30%16%5%
165
16th to endDay
19%35%31%8%3
288
April1st to 15thDay
19%34%27%12%41
269
16th to endDay
28%35%22%10%2
270
May1st to 15thDay
18%19%29%20%9%1
387
16th to endDay
17%15%26%23%13%3
517
June1st to 15thDay
12%13%26%28%16%3
495
16th to endDay
6%7%27%30%22%5%
495
July1st to 15thDay
14%416%32%24%8%
475
16th to endDay
12%5%17%29%24%10%
437
August1st to 15thDay
18%6%26%30%14%4
315
16th to endDay
17%8%22%30%16%4
332
September1st to 15thDay
16%13%31%24%11%3
315
16th to endDay
10%11%32%22%16%7%
156
October1st to 15thDay
8%18%23%22%22%4
90
16th to endDay
14%13%26%29%14%2
96
November1st to 15thDay
7%18%18%26%23%4
90
16th to endDay
22%20%38%17%1
90
December1st to 15thDay
20%30%33%14%2
90
16th to endDay
5%31%43%12%6%1
96
January1st to 15thNight
7%22%37%19%10%1
900
16th to endNight
6%19%42%22%7%1
770
February1st to 15thNight
5%20%46%21%5%
704
16th to endNight
421%44%26%4
632
March1st to 15thNight
419%39%26%8%1
720
16th to endNight
5%16%44%26%5%
699
April1st to 15thNight
5%17%41%27%7%
539
16th to endNight
9%16%34%30%7%
540
May1st to 15thNight
10%11%34%32%11%1
540
16th to endNight
9%9%25%34%17%2
563
June1st to 15thNight
45%30%39%18%2
540
16th to endNight
4320%44%24%3
540
July1st to 15thNight
8%18%38%38%4
510
16th to endNight
7%25%34%43%7%
564
August1st to 15thNight
7%18%42%35%4
539
16th to endNight
6%310%37%34%6%
573
September1st to 15thNight
6%213%45%25%7%
540
16th to endNight
5%424%36%24%4
517
October1st to 15thNight
6%8%40%25%15%3
660
16th to endNight
5%12%35%29%14%3
704
November1st to 15thNight
5%15%40%26%10%1
875
16th to endNight
420%39%26%7%1
900
December1st to 15thNight
6%24%40%22%4
900
16th to endNight
6%20%41%23%7%
960
Page generated at 2017-09-18 06:38:26. Version ac04

Copyright 2017 A. Danko


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