Lake City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake City 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
58%
15760
22%
46940
18%
15722
64%
15722
32%
28617

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
42%
717
22%
2327
14%
716
52%
716
28%
1397
January16th to endNight
41%
768
24%
2436
17%
768
51%
768
27%
1513
February1st to 15thNight
42%
701
26%
2108
15%
700
52%
700
32%
1264
February16th to endNight
45%
631
25%
1890
17%
631
54%
631
31%
1155
March1st to 15thNight
49%
720
28%
1980
17%
720
58%
720
38%
1171
March16th to endNight
51%
768
26%
2112
17%
768
57%
768
39%
1231
April1st to 15thNight
54%
718
24%
1976
17%
718
59%
718
38%
1167
April16th to endNight
60%
633
30%
1779
20%
633
66%
633
43%
989
May1st to 15thNight
69%
539
26%
1619
21%
539
73%
539
43%
874
May16th to endNight
75%
561
23%
1682
18%
561
76%
561
39%
955
June1st to 15thNight
70%
540
15%
1620
14%
540
71%
540
27%
1057
June16th to endNight
75%
540
12%
1620
10%
540
76%
540
28%
1055
July1st to 15thNight
76%
510
10%
1530
9%
510
76%
510
29%
990
July16th to endNight
74%
564
9%
1595
9%
531
75%
531
25%
1084
August1st to 15thNight
76%
539
8%
1627
9%
536
77%
536
27%
1071
August16th to endNight
68%
654
12%
1991
14%
654
68%
654
23%
1358
September1st to 15thNight
66%
720
12%
1980
12%
720
66%
720
23%
1394
September16th to endNight
60%
665
17%
1837
16%
665
62%
665
25%
1263
October1st to 15thNight
66%
660
30%
1851
28%
660
69%
660
36%
1096
October16th to endNight
62%
704
31%
2112
30%
704
68%
704
38%
1198
November1st to 15thNight
59%
700
31%
2101
28%
700
66%
700
41%
1145
November16th to endNight
53%
720
29%
2331
24%
720
64%
720
35%
1293
December1st to 15thNight
50%
720
27%
2340
24%
720
57%
720
31%
1362
December16th to endNight
50%
768
23%
2496
20%
768
56%
768
27%
1535

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
9%5%25%6%36%5%6%8%39%
47819
Night
9%425%5%345%6%8%45%
47144
TransparencyDay
41%5%13%18%14%7%
47520
Night
35%5%14%20%15%8%
46947
SeeingDay
10%311%21%26%26%
5628
Night
11%316%34%28%6%
15769

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
12%7%246%24448%41%
1611
16th to endDay
14%6%25%5%34345%44%
1785
February1st to 15thDay
16%6%34423345%46%
1750
16th to endDay
13%6%245%23345%48%
1580
March1st to 15thDay
9%32341445%7%52%
1980
16th to endDay
8%425%5%25%447%49%
2111
April1st to 15thDay
8%425%5%345%5%7%47%
1972
16th to endDay
6%424435%5%6%7%50%
2190
May1st to 15thDay
5%424425%5%6%9%49%
2331
16th to endDay
7%4346%36%6%6%7%41%
2431
June1st to 15thDay
9%5%37%8%5%7%7%6%9%29%
2340
16th to endDay
8%5%26%7%48%8%8%10%28%
2340
July1st to 15thDay
7%438%8%47%8%9%10%27%
2340
16th to endDay
8%5%47%8%6%9%8%8%9%23%
2465
August1st to 15thDay
11%6%27%9%6%8%7%7%11%20%
2318
16th to endDay
13%7%38%8%6%7%6%7%8%22%
2196
September1st to 15thDay
10%6%48%8%5%7%7%6%10%24%
1980
16th to endDay
12%9%37%7%47%5%6%7%27%
1829
October1st to 15thDay
10%6%25%5%35%45%7%43%
1779
16th to endDay
8%5%1443445%6%52%
1760
November1st to 15thDay
7%42442446%7%52%
1757
16th to endDay
9%42342445%7%51%
1626
December1st to 15thDay
12%5%25%5%2445%7%43%
1620
16th to endDay
11%7%26%5%3445%8%39%
1728
January1st to 15thNight
12%7%35%324347%44%
2327
16th to endNight
15%5%26%42345%6%44%
2436
February1st to 15thNight
14%5%25%41333451%
2103
16th to endNight
12%6%24424346%48%
1890
March1st to 15thNight
7%415%5%2445%7%50%
1980
16th to endNight
9%423414435%56%
2112
April1st to 15thNight
9%42332435%7%52%
1976
16th to endNight
45%1442337%6%55%
1779
May1st to 15thNight
5%3134245%5%9%54%
1619
16th to endNight
5%3133346%5%10%51%
1682
June1st to 15thNight
8%426%5%37%6%8%12%34%
1620
16th to endNight
6%325%5%47%5%9%13%35%
1620
July1st to 15thNight
5%415%6%35%9%9%14%36%
1620
16th to endNight
4427%6%46%7%10%12%31%
1703
August1st to 15thNight
6%325%7%36%8%9%13%32%
1638
16th to endNight
9%5%25%6%46%6%7%11%33%
1991
September1st to 15thNight
10%5%36%6%37%6%9%11%30%
1980
16th to endNight
11%5%37%5%45%6%6%10%32%
1837
October1st to 15thNight
7%4245%2346%7%49%
1851
16th to endNight
7%315%5%2445%6%52%
2112
November1st to 15thNight
7%31442345%8%54%
2101
16th to endNight
9%41443345%6%51%
2331
December1st to 15thNight
11%5%35%42335%8%46%
2340
16th to endNight
12%5%36%43445%7%42%
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
41%38%18%17%10%
1612
16th to endDay
42%25%19%19%10%
1785
February1st to 15thDay
40%27%14%19%15%
1752
16th to endDay
39%27%14%23%13%
1580
March1st to 15thDay
30%39%22%23%10%
1980
16th to endDay
34%310%20%20%11%
2112
April1st to 15thDay
35%48%18%23%10%
1972
16th to endDay
30%410%23%21%9%
2190
May1st to 15thDay
29%313%23%21%8%
2331
16th to endDay
37%5%13%23%15%4
2435
June1st to 15thDay
47%6%18%16%9%
2340
16th to endDay
46%9%20%18%5%
2340
July1st to 15thDay
45%10%27%15%1
2201
16th to endDay
50%10%22%13%3
2310
August1st to 15thDay
52%10%23%11%2
2305
16th to endDay
55%8%20%11%3
2196
September1st to 15thDay
51%8%18%13%6%1
1980
16th to endDay
53%6%10%16%10%3
1829
October1st to 15thDay
39%38%18%17%11%
1779
16th to endDay
33%37%15%24%16%
1760
November1st to 15thDay
28%38%23%22%13%
1757
16th to endDay
32%28%19%21%14%
1626
December1st to 15thDay
39%39%22%18%6%
1620
16th to endDay
41%49%22%13%8%
1728
January1st to 15thNight
39%29%19%18%10%
2327
16th to endNight
40%37%14%22%11%
2436
February1st to 15thNight
36%26%15%21%17%
2112
16th to endNight
38%37%17%20%13%
1890
March1st to 15thNight
31%310%24%18%10%
1980
16th to endNight
31%311%21%21%11%
2112
April1st to 15thNight
30%5%10%19%24%9%
1976
16th to endNight
27%312%25%20%9%
1779
May1st to 15thNight
24%6%15%26%18%9%
1620
16th to endNight
27%6%18%25%17%3
1684
June1st to 15thNight
39%7%21%24%6%
1620
16th to endNight
34%12%24%21%6%
1620
July1st to 15thNight
34%10%30%20%2
1530
16th to endNight
37%12%30%14%3
1595
August1st to 15thNight
36%11%34%15%2
1627
16th to endNight
40%11%26%16%4
1991
September1st to 15thNight
42%11%22%15%6%1
1980
16th to endNight
44%6%15%19%10%3
1837
October1st to 15thNight
32%5%10%20%18%12%
1851
16th to endNight
30%47%18%24%14%
2112
November1st to 15thNight
28%28%23%23%12%
2101
16th to endNight
31%38%20%19%16%
2331
December1st to 15thNight
36%212%24%16%7%
2340
16th to endNight
40%311%22%14%8%
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
14%10%38%17%8%10%
90
16th to endDay
14%13%33%26%12%
96
February1st to 15thDay
13%21%24%24%13%3
90
16th to endDay
6%7%39%33%12%1
81
March1st to 15thDay
11%328%34%19%2
270
16th to endDay
12%421%29%27%4
288
April1st to 15thDay
10%7%24%26%24%7%
270
16th to endDay
7%211%33%27%16%
270
May1st to 15thDay
6%311%30%26%20%
288
16th to endDay
7%1415%35%35%
331
June1st to 15thDay
11%413%27%41%
315
16th to endDay
10%10%25%51%
315
July1st to 15thDay
4115%25%61%
305
16th to endDay
7%129%30%48%
326
August1st to 15thDay
15%211%23%46%
313
16th to endDay
9%1210%28%47%
332
September1st to 15thDay
15%1216%31%32%
315
16th to endDay
19%3315%35%23%
259
October1st to 15thDay
13%310%27%33%10%
255
16th to endDay
9%216%31%32%7%
272
November1st to 15thDay
9%216%38%22%9%
265
16th to endDay
8%433%25%20%8%
96
December1st to 15thDay
3238%33%15%6%
90
16th to endDay
19%321%34%13%7%
96
January1st to 15thNight
16%6%27%33%15%1
720
16th to endNight
17%7%26%36%11%
768
February1st to 15thNight
15%5%29%35%11%1
704
16th to endNight
14%5%28%44%6%
631
March1st to 15thNight
9%6%29%40%13%
720
16th to endNight
11%425%38%18%1
768
April1st to 15thNight
10%425%40%18%
718
16th to endNight
7%321%40%25%1
633
May1st to 15thNight
6%215%47%24%3
540
16th to endNight
8%17%35%41%6%
563
June1st to 15thNight
10%431%41%11%
540
16th to endNight
7%2219%48%19%
540
July1st to 15thNight
7%1117%50%21%
510
16th to endNight
5%117%53%21%
564
August1st to 15thNight
7%11%60%19%
539
16th to endNight
12%2319%43%19%
654
September1st to 15thNight
12%2323%45%14%
720
16th to endNight
13%16%34%38%5%
665
October1st to 15thNight
10%111%38%34%3
660
16th to endNight
8%117%41%28%2
704
November1st to 15thNight
8%222%42%23%1
700
16th to endNight
9%326%40%18%1
720
December1st to 15thNight
13%324%37%19%1
720
16th to endNight
14%422%37%19%
768
Page generated at 2017-09-18 08:38:26. Version ac04

Copyright 2017 A. Danko


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