Highlands Hammock State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Highlands Hammock State Park clear sky chart from 2005-11-05 to 2017-04-28.

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
61%
15558
20%
45613
16%
15517
65%
15517
29%
29073

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
52%
718
19%
2327
15%
716
59%
716
26%
1444
January16th to endNight
48%
768
24%
2433
19%
768
57%
768
30%
1449
February1st to 15thNight
48%
701
22%
2103
16%
698
56%
698
31%
1286
February16th to endNight
49%
631
28%
1809
17%
631
60%
631
38%
1026
March1st to 15thNight
53%
720
30%
1980
17%
720
64%
720
42%
1102
March16th to endNight
58%
768
27%
2112
21%
768
63%
768
41%
1220
April1st to 15thNight
62%
718
23%
1976
18%
718
66%
718
43%
1097
April16th to endNight
60%
712
27%
1825
18%
712
65%
712
41%
1088
May1st to 15thNight
71%
566
29%
1556
21%
566
75%
566
41%
903
May16th to endNight
76%
513
19%
1538
15%
513
78%
513
32%
966
June1st to 15thNight
70%
495
9%
1485
8%
495
70%
495
21%
1080
June16th to endNight
73%
495
6%
1485
6%
495
73%
495
21%
1114
July1st to 15thNight
70%
465
6%
1395
6%
465
70%
465
17%
1106
July16th to endNight
76%
522
7%
1469
7%
489
76%
489
20%
1097
August1st to 15thNight
76%
494
6%
1474
6%
491
76%
491
23%
1038
August16th to endNight
63%
683
5%
1905
5%
683
63%
683
16%
1457
September1st to 15thNight
61%
660
5%
1815
5%
660
61%
660
15%
1394
September16th to endNight
57%
657
9%
1815
9%
657
58%
657
17%
1374
October1st to 15thNight
66%
660
23%
1878
23%
660
68%
660
31%
1181
October16th to endNight
59%
704
25%
2112
24%
704
64%
704
31%
1285
November1st to 15thNight
63%
700
31%
2101
27%
700
70%
700
37%
1194
November16th to endNight
55%
720
30%
2184
26%
720
63%
720
34%
1279
December1st to 15thNight
57%
720
25%
2340
24%
720
63%
720
29%
1414
December16th to endNight
58%
768
22%
2496
22%
768
63%
768
30%
1479

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
8%5%36%7%46%6%6%8%35%
46060
Night
7%425%5%35%5%6%9%43%
45822
TransparencyDay
43%9%13%15%12%5%
45761
Night
35%9%16%19%14%5%
45625
SeeingDay
9%212%21%25%29%
5296
Night
8%217%33%27%9%
15566

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
11%6%35%6%35%5%6%8%37%
1611
16th to endDay
10%4235%3446%8%45%
1788
February1st to 15thDay
10%5%25%6%3445%5%46%
1750
16th to endDay
6%425%6%35%46%7%46%
1661
March1st to 15thDay
42145%35%6%5%8%50%
1980
16th to endDay
7%4245%35%5%5%7%48%
2111
April1st to 15thDay
5%425%5%46%6%7%8%43%
1972
16th to endDay
6%425%5%46%6%5%7%44%
2082
May1st to 15thDay
5%4245%5%6%46%8%46%
2072
16th to endDay
7%5%37%9%6%7%5%7%7%31%
2223
June1st to 15thDay
10%9%49%8%5%7%7%6%7%22%
2145
16th to endDay
8%7%5%9%9%5%7%7%6%9%23%
2145
July1st to 15thDay
10%7%49%10%5%9%6%7%7%18%
2145
16th to endDay
8%6%410%9%6%8%7%7%9%20%
2283
August1st to 15thDay
6%7%38%9%6%9%6%9%10%22%
2145
16th to endDay
11%8%38%9%5%8%7%7%9%19%
1930
September1st to 15thDay
8%7%39%9%6%8%7%6%9%22%
1815
16th to endDay
11%9%39%9%5%7%7%7%9%19%
1815
October1st to 15thDay
8%5%27%8%46%6%6%8%36%
1749
16th to endDay
8%6%247%46%45%7%42%
1760
November1st to 15thDay
5%426%5%35%5%6%9%46%
1757
16th to endDay
7%436%5%445%6%7%44%
1773
December1st to 15thDay
9%6%46%6%36%448%39%
1620
16th to endDay
6%426%5%3447%7%45%
1728
January1st to 15thNight
8%5%27%5%345%6%9%40%
2327
16th to endNight
10%42443446%8%44%
2433
February1st to 15thNight
10%5%245%3345%7%46%
2103
16th to endNight
5%315%42347%8%52%
1809
March1st to 15thNight
431433446%8%55%
1980
16th to endNight
432442445%8%55%
2112
April1st to 15thNight
422433445%8%56%
1976
16th to endNight
5%314425%45%8%54%
1825
May1st to 15thNight
43244345%48%55%
1556
16th to endNight
6%214436%7%7%9%44%
1538
June1st to 15thNight
7%5%38%7%46%7%8%12%28%
1485
16th to endNight
5%5%37%8%47%7%9%10%31%
1485
July1st to 15thNight
8%7%37%8%47%6%9%10%27%
1485
16th to endNight
6%426%7%5%8%8%8%11%29%
1577
August1st to 15thNight
5%5%26%6%35%5%8%12%36%
1485
16th to endNight
8%7%36%6%46%6%8%12%28%
1905
September1st to 15thNight
7%6%48%7%47%8%9%10%26%
1815
16th to endNight
9%7%38%7%47%7%7%9%26%
1815
October1st to 15thNight
8%5%245%445%48%46%
1878
16th to endNight
10%5%25%42445%8%46%
2112
November1st to 15thNight
6%3344335%5%7%52%
2101
16th to endNight
8%3245%35%45%8%48%
2184
December1st to 15thNight
7%5%35%5%25%45%8%45%
2340
16th to endNight
6%425%6%26%5%6%8%46%
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
40%6%10%18%18%4
1612
16th to endDay
35%5%8%20%20%8%
1788
February1st to 15thDay
37%5%8%14%20%13%
1752
16th to endDay
34%6%10%16%19%11%
1661
March1st to 15thDay
29%5%12%23%19%8%
1980
16th to endDay
33%5%11%20%21%8%
2112
April1st to 15thDay
34%8%13%19%18%5%
1972
16th to endDay
36%6%10%16%22%7%
2082
May1st to 15thDay
34%6%13%20%17%7%
2072
16th to endDay
47%9%14%16%10%1
2227
June1st to 15thDay
56%10%16%13%3
2145
16th to endDay
54%13%18%11%1
2145
July1st to 15thDay
61%13%17%5%1
2006
16th to endDay
56%13%18%9%1
2128
August1st to 15thDay
50%16%24%8%
2132
16th to endDay
57%15%19%6%1
1930
September1st to 15thDay
55%15%17%9%2
1815
16th to endDay
57%12%15%9%31
1815
October1st to 15thDay
41%9%11%16%14%6%
1749
16th to endDay
39%5%9%13%20%10%
1760
November1st to 15thDay
33%6%10%20%19%9%
1757
16th to endDay
37%6%9%17%15%12%
1773
December1st to 15thDay
42%6%12%17%16%5%
1620
16th to endDay
35%6%13%20%17%7%
1728
January1st to 15thNight
38%6%13%21%14%5%
2327
16th to endNight
35%5%10%23%17%7%
2433
February1st to 15thNight
35%5%8%17%20%12%
2112
16th to endNight
28%5%14%22%21%8%
1809
March1st to 15thNight
25%411%30%20%7%
1980
16th to endNight
26%6%13%25%19%8%
2112
April1st to 15thNight
24%6%16%26%19%6%
1976
16th to endNight
26%7%12%23%23%6%
1825
May1st to 15thNight
26%7%13%28%19%5%
1557
16th to endNight
30%11%18%23%15%
1540
June1st to 15thNight
43%13%22%15%4
1485
16th to endNight
42%16%23%12%4
1485
July1st to 15thNight
48%17%24%8%2
1395
16th to endNight
43%15%27%13%
1469
August1st to 15thNight
36%17%35%10%
1474
16th to endNight
44%18%26%8%1
1905
September1st to 15thNight
47%17%22%10%3
1815
16th to endNight
49%13%18%13%4
1815
October1st to 15thNight
34%8%14%17%19%5%
1878
16th to endNight
34%6%11%14%23%9%
2112
November1st to 15thNight
30%5%10%23%21%8%
2101
16th to endNight
32%5%9%22%17%11%
2184
December1st to 15thNight
35%6%12%24%14%6%
2340
16th to endNight
33%7%14%19%17%6%
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
17%5%38%18%13%5%
90
16th to endDay
12%12%34%20%16%3
96
February1st to 15thDay
10%10%25%31%14%8%
90
16th to endDay
12%6%29%35%16%
162
March1st to 15thDay
5%328%34%24%4
270
16th to endDay
9%321%26%33%5%
288
April1st to 15thDay
4222%31%30%9%
270
16th to endDay
7%213%29%27%19%
259
May1st to 15thDay
6%9%21%36%25%
228
16th to endDay
6%6%16%32%37%
267
June1st to 15thDay
14%15%9%21%46%
255
16th to endDay
7%27%19%63%
255
July1st to 15thDay
7%8%13%69%
245
16th to endDay
9%49%18%58%
270
August1st to 15thDay
9%28%17%61%
253
16th to endDay
10%137%17%60%
268
September1st to 15thDay
12%1310%21%50%
255
16th to endDay
11%17%32%46%
254
October1st to 15thDay
9%16%29%36%16%
255
16th to endDay
11%119%25%31%11%
272
November1st to 15thDay
7%112%35%29%13%
265
16th to endDay
7%221%34%29%4
243
December1st to 15thDay
8%234%42%12%
90
16th to endDay
5%313%33%36%8%
96
January1st to 15thNight
9%5%22%41%18%1
720
16th to endNight
11%428%40%12%1
768
February1st to 15thNight
12%428%41%13%
704
16th to endNight
7%429%44%13%
631
March1st to 15thNight
4432%41%15%
720
16th to endNight
6%325%46%18%
768
April1st to 15thNight
5%224%46%19%1
718
16th to endNight
6%223%42%23%
712
May1st to 15thNight
5%214%46%28%2
567
16th to endNight
6%8%36%41%6%
515
June1st to 15thNight
7%426%45%15%
495
16th to endNight
7%212%45%31%
495
July1st to 15thNight
9%29%44%34%
465
16th to endNight
6%28%42%39%
522
August1st to 15thNight
9%17%44%37%
494
16th to endNight
12%6%15%34%30%
683
September1st to 15thNight
10%15%16%39%27%
660
16th to endNight
12%15%23%40%16%
657
October1st to 15thNight
13%9%35%36%5%
660
16th to endNight
13%17%35%27%4
704
November1st to 15thNight
7%219%42%26%2
700
16th to endNight
9%125%41%20%1
720
December1st to 15thNight
9%421%41%23%
720
16th to endNight
6%323%38%26%2
768
Page generated at 2017-04-29 09:45:04. Version ac04

Copyright 2017 A. Danko


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