Limekiln State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Limekiln State Park clear sky chart from 2005-11-05 to 2017-08-12.

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
64%
15436
31%
46557
25%
15400
70%
15400
42%
23494

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
53%
716
23%
2351
20%
716
60%
716
28%
1308
January16th to endNight
51%
768
26%
2496
22%
768
59%
768
26%
1441
February1st to 15thNight
51%
700
26%
2245
27%
700
55%
700
27%
1302
February16th to endNight
51%
632
24%
1895
20%
632
58%
632
28%
1136
March1st to 15thNight
51%
720
21%
2019
16%
720
57%
720
28%
1246
March16th to endNight
53%
768
24%
2076
16%
768
60%
768
33%
1248
April1st to 15thNight
52%
719
26%
1799
15%
719
56%
719
37%
1100
April16th to endNight
58%
720
30%
1800
14%
720
64%
720
49%
966
May1st to 15thNight
66%
692
28%
1772
15%
692
70%
692
51%
895
May16th to endNight
63%
420
33%
1543
23%
420
77%
420
48%
604
June1st to 15thNight
69%
360
33%
1440
31%
360
80%
360
51%
514
June16th to endNight
77%
360
42%
1440
40%
360
91%
360
69%
416
July1st to 15thNight
84%
418
35%
1438
34%
418
87%
418
71%
480
July16th to endNight
77%
564
39%
1593
29%
531
88%
531
66%
638
August1st to 15thNight
85%
591
41%
1640
28%
588
87%
588
74%
664
August16th to endNight
86%
700
42%
1750
24%
700
90%
700
79%
762
September1st to 15thNight
85%
660
45%
1650
33%
660
87%
660
73%
743
September16th to endNight
80%
656
46%
1783
37%
656
88%
656
71%
753
October1st to 15thNight
70%
660
32%
1980
35%
660
73%
660
48%
957
October16th to endNight
71%
704
37%
2112
34%
704
80%
704
46%
1022
November1st to 15thNight
65%
700
35%
2172
34%
700
71%
700
44%
1047
November16th to endNight
60%
720
29%
2355
26%
720
67%
720
34%
1211
December1st to 15thNight
51%
720
25%
2520
22%
720
59%
720
24%
1460
December16th to endNight
47%
768
24%
2688
22%
768
54%
768
23%
1581

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
7%212212335%66%
47407
Night
7%312212235%65%
46749
TransparencyDay
20%49%22%25%18%
47098
Night
22%38%19%24%21%
46558
SeeingDay
8%12%16%31%26%5%
5936
Night
7%15%7%24%31%12%
15446

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
14%313324448%48%
1584
16th to endDay
16%313323336%50%
1728
February1st to 15thDay
15%5%14314245%49%
1616
16th to endDay
17%6%23325%45%7%40%
1579
March1st to 15thDay
12%4235%35%449%44%
1938
16th to endDay
12%5%24325%447%47%
2148
April1st to 15thDay
12%41332445%6%51%
2149
16th to endDay
6%312323347%62%
2160
May1st to 15thDay
321112346%72%
2175
16th to endDay
322212336%71%
2569
June1st to 15thDay
221112335%75%
2520
16th to endDay
11387%
2520
July1st to 15thDay
121486%
2430
16th to endDay
111222482%
2468
August1st to 15thDay
11112385%
2222
16th to endDay
1112386%
2100
September1st to 15thDay
11121384%
1980
16th to endDay
1112222479%
1843
October1st to 15thDay
5%212212345%67%
1650
16th to endDay
6%211312335%67%
1760
November1st to 15thDay
8%32221223463%
1687
16th to endDay
12%423213337%56%
1605
December1st to 15thDay
15%5%25%334445%45%
1440
16th to endDay
17%5%23423347%45%
1536
January1st to 15thNight
12%5%13323347%52%
2351
16th to endNight
15%313422336%51%
2496
February1st to 15thNight
14%423323447%49%
2234
16th to endNight
15%5%24214346%48%
1895
March1st to 15thNight
12%423424347%49%
2019
16th to endNight
9%5%24314447%51%
2076
April1st to 15thNight
10%423424345%54%
1799
16th to endNight
4212222248%66%
1800
May1st to 15thNight
22222224472%
1772
16th to endNight
2212111135%76%
1542
June1st to 15thNight
211112226%77%
1440
16th to endNight
11290%
1440
July1st to 15thNight
11112386%
1525
16th to endNight
111113382%
1701
August1st to 15thNight
11112286%
1649
16th to endNight
1111388%
1750
September1st to 15thNight
111112484%
1650
16th to endNight
1111112383%
1783
October1st to 15thNight
5%312222235%67%
1980
16th to endNight
433213235%67%
2112
November1st to 15thNight
6%212212345%67%
2172
16th to endNight
7%413223448%58%
2355
December1st to 15thNight
13%5%23323446%50%
2520
16th to endNight
18%5%13323346%48%
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
33%5%9%19%20%11%
1584
16th to endDay
36%5%10%13%19%15%
1728
February1st to 15thDay
37%48%18%22%8%
1616
16th to endDay
40%7%11%21%13%4
1579
March1st to 15thDay
36%6%11%21%15%8%
1938
16th to endDay
35%6%12%21%18%5%
2148
April1st to 15thDay
31%6%12%24%19%4
2149
16th to endDay
21%5%12%26%24%8%
2160
May1st to 15thDay
13%411%28%30%11%
2175
16th to endDay
15%316%28%25%9%
2573
June1st to 15thDay
12%412%27%27%15%
2520
16th to endDay
5%1320%33%35%
2520
July1st to 15thDay
5%1415%32%40%
2288
16th to endDay
7%27%20%26%35%
2313
August1st to 15thDay
5%1424%30%34%
2206
16th to endDay
5%1426%29%33%
2100
September1st to 15thDay
5%15%21%31%34%
1980
16th to endDay
10%18%16%35%27%
1843
October1st to 15thDay
18%39%24%22%20%
1650
16th to endDay
18%310%23%23%20%
1760
November1st to 15thDay
25%49%21%28%11%
1687
16th to endDay
28%310%20%25%11%
1605
December1st to 15thDay
39%6%7%17%17%10%
1440
16th to endDay
38%6%11%17%16%8%
1536
January1st to 15thNight
32%39%20%23%10%
2351
16th to endNight
34%411%12%19%17%
2496
February1st to 15thNight
34%48%19%22%10%
2245
16th to endNight
34%412%23%18%5%
1895
March1st to 15thNight
33%7%11%19%17%11%
2019
16th to endNight
30%6%13%19%21%8%
2076
April1st to 15thNight
32%312%24%20%6%
1799
16th to endNight
17%411%27%27%10%
1800
May1st to 15thNight
15%310%21%31%18%
1773
16th to endNight
13%213%25%30%14%
1543
June1st to 15thNight
11%311%22%27%24%
1440
16th to endNight
31212%29%50%
1440
July1st to 15thNight
5%29%27%53%
1438
16th to endNight
8%1417%24%43%
1593
August1st to 15thNight
6%217%31%41%
1640
16th to endNight
4414%28%47%
1750
September1st to 15thNight
6%2214%23%50%
1650
16th to endNight
7%417%34%33%
1783
October1st to 15thNight
20%27%22%26%20%
1980
16th to endNight
19%36%21%28%20%
2112
November1st to 15thNight
20%210%21%30%14%
2172
16th to endNight
24%5%10%19%26%14%
2355
December1st to 15thNight
34%5%9%16%21%11%
2520
16th to endNight
38%412%18%16%10%
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
23%14%16%21%19%5%
213
16th to endDay
16%17%17%22%20%6%
256
February1st to 15thDay
16%16%19%19%23%4
243
16th to endDay
16%17%19%29%15%2
238
March1st to 15thDay
14%17%18%28%18%2
270
16th to endDay
12%15%25%31%14%1
288
April1st to 15thDay
15%20%21%29%11%1
269
16th to endDay
5%20%29%30%12%1
270
May1st to 15thDay
7%15%25%31%18%1
288
16th to endDay
316%19%33%21%5%
330
June1st to 15thDay
411%20%38%21%3
315
16th to endDay
9%12%40%29%7%
315
July1st to 15thDay
16%8%33%43%7%
305
16th to endDay
19%7%32%40%9%
327
August1st to 15thDay
25%8%44%33%5%
300
16th to endDay
6%11%33%40%7%
268
September1st to 15thDay
36%10%30%43%6%
255
16th to endDay
49%10%29%38%8%
255
October1st to 15thDay
6%10%20%30%28%5%
255
16th to endDay
9%7%20%32%24%4
272
November1st to 15thDay
7%10%13%18%38%11%
193
16th to endDay
11%8%21%37%18%2
87
December1st to 15thDay
28%6%25%30%10%
60
16th to endDay
14%12%15%32%20%4
64
January1st to 15thNight
14%18%6%23%26%11%
720
16th to endNight
16%17%7%22%26%9%
768
February1st to 15thNight
14%18%9%24%23%9%
704
16th to endNight
14%18%10%28%23%4
632
March1st to 15thNight
12%18%10%24%25%7%
720
16th to endNight
11%18%12%27%25%5%
768
April1st to 15thNight
9%19%13%29%21%6%
719
16th to endNight
418%15%28%22%9%
720
May1st to 15thNight
317%8%34%26%9%
693
16th to endNight
318%10%29%25%12%
421
June1st to 15thNight
216%9%26%35%8%
360
16th to endNight
16%5%25%41%10%
360
July1st to 15thNight
111%114%46%24%
418
16th to endNight
116%14%40%26%
564
August1st to 15thNight
9%124%43%20%
591
16th to endNight
9%218%50%19%
700
September1st to 15thNight
19%119%48%20%
660
16th to endNight
29%421%39%22%
656
October1st to 15thNight
6%10%7%21%36%16%
660
16th to endNight
6%10%5%26%32%17%
704
November1st to 15thNight
6%15%8%25%30%14%
700
16th to endNight
8%18%8%25%28%11%
720
December1st to 15thNight
14%18%10%26%24%5%
720
16th to endNight
16%21%10%25%21%5%
768
Page generated at 2017-08-13 11:16:26. Version ac04

Copyright 2017 A. Danko


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