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 2017-12-20.

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%
15959
31%
48100
25%
15923
71%
15923
42%
24184

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%
607
40%
1680
28%
604
88%
604
74%
680
August16th to endNight
87%
764
45%
1910
26%
764
91%
764
81%
826
September1st to 15thNight
85%
720
43%
1800
31%
720
87%
720
71%
823
September16th to endNight
81%
716
48%
1946
39%
716
88%
716
73%
816
October1st to 15thNight
71%
720
32%
2160
34%
720
75%
720
51%
1018
October16th to endNight
72%
768
39%
2304
37%
768
80%
768
48%
1099
November1st to 15thNight
66%
760
33%
2358
32%
760
71%
760
43%
1158
November16th to endNight
60%
780
29%
2551
27%
780
66%
780
34%
1326
December1st to 15thNight
54%
780
26%
2730
24%
780
62%
780
27%
1531
December16th to endNight
47%
787
25%
2754
23%
787
54%
787
23%
1613

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%
48731
Night
7%312212235%65%
48292
TransparencyDay
20%39%22%25%18%
48422
Night
21%38%19%25%21%
48101
SeeingDay
7%11%16%31%27%5%
6394
Night
7%15%7%25%31%12%
15969

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%
2268
16th to endDay
1112386%
2292
September1st to 15thDay
111222482%
2160
16th to endDay
1112222480%
2010
October1st to 15thDay
4212212345%69%
1800
16th to endDay
5%211312335%67%
1920
November1st to 15thDay
8%313312335%62%
1831
16th to endDay
11%323213347%55%
1738
December1st to 15thDay
14%5%2433445%5%47%
1560
16th to endDay
16%5%23423347%45%
1568
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
11112287%
1689
16th to endNight
111488%
1910
September1st to 15thNight
111112483%
1800
16th to endNight
111112384%
1946
October1st to 15thNight
5%312112235%69%
2160
16th to endNight
423213235%68%
2304
November1st to 15thNight
6%313212345%65%
2358
16th to endNight
7%413223448%57%
2551
December1st to 15thNight
12%5%2332345%6%51%
2730
16th to endNight
18%5%13323346%48%
2754

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%1423%30%34%
2252
16th to endDay
4427%29%32%
2292
September1st to 15thDay
6%17%21%30%32%
2160
16th to endDay
9%17%18%36%26%
2010
October1st to 15thDay
16%39%22%22%25%
1800
16th to endDay
18%39%23%22%21%
1920
November1st to 15thDay
25%410%21%26%10%
1831
16th to endDay
28%49%20%25%11%
1738
December1st to 15thDay
37%6%7%16%18%14%
1560
16th to endDay
38%6%11%17%17%8%
1568
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%30%42%
1680
16th to endNight
4316%29%46%
1910
September1st to 15thNight
7%2315%23%48%
1800
16th to endNight
7%418%36%31%
1946
October1st to 15thNight
18%27%20%25%25%
2160
16th to endNight
18%36%21%27%22%
2304
November1st to 15thNight
21%310%21%29%13%
2358
16th to endNight
25%5%9%19%25%14%
2551
December1st to 15thNight
32%5%8%15%21%16%
2730
16th to endNight
37%411%17%17%10%
2754

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%7%44%33%6%
315
16th to endDay
5%10%33%43%7%
332
September1st to 15thDay
25%11%32%42%6%
315
16th to endDay
38%9%30%39%7%
315
October1st to 15thDay
5%8%20%33%28%4
315
16th to endDay
8%6%19%30%26%8%
336
November1st to 15thDay
8%8%12%26%34%8%
247
16th to endDay
9%6%21%33%25%4
130
December1st to 15thDay
18%421%27%22%5%
90
16th to endDay
12%13%15%30%23%4
72
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%19%
607
16th to endNight
8%218%50%19%
764
September1st to 15thNight
18%121%47%19%
720
16th to endNight
28%5%22%40%21%
716
October1st to 15thNight
5%10%7%24%35%16%
720
16th to endNight
6%9%5%26%33%18%
768
November1st to 15thNight
6%14%8%26%30%13%
760
16th to endNight
9%17%8%26%28%10%
780
December1st to 15thNight
13%16%10%27%25%7%
780
16th to endNight
16%20%10%25%21%6%
787
Page generated at 2017-12-21 04:04:56. Version ac04

Copyright 2017 A. Danko


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