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 2017-10-31.

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%
16194
20%
47451
16%
16153
65%
16153
29%
30368

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%
720
28%
1845
18%
720
66%
720
41%
1098
May1st to 15thNight
71%
617
27%
1697
20%
617
74%
617
41%
984
May16th to endNight
76%
561
20%
1682
16%
561
78%
561
33%
1041
June1st to 15thNight
69%
540
8%
1620
8%
540
69%
540
19%
1201
June16th to endNight
71%
540
6%
1620
6%
540
71%
540
19%
1232
July1st to 15thNight
71%
510
6%
1530
6%
510
71%
510
18%
1197
July16th to endNight
75%
564
6%
1595
7%
531
75%
531
19%
1204
August1st to 15thNight
75%
539
5%
1609
5%
536
75%
536
23%
1138
August16th to endNight
64%
746
5%
2080
5%
746
64%
746
17%
1579
September1st to 15thNight
61%
720
5%
1980
5%
720
62%
720
15%
1526
September16th to endNight
59%
717
11%
1980
10%
717
59%
717
18%
1479
October1st to 15thNight
66%
720
22%
2049
23%
720
67%
720
30%
1302
October16th to endNight
60%
768
26%
2303
25%
768
64%
768
32%
1397
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%
48276
Night
7%425%5%35%5%6%9%43%
47660
TransparencyDay
43%9%14%15%12%5%
47977
Night
35%9%16%19%14%5%
47463
SeeingDay
9%212%21%25%30%
6035
Night
8%216%33%28%9%
16202

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%
2114
May1st to 15thDay
44245%5%6%45%7%47%
2261
16th to endDay
7%5%36%9%6%7%5%7%7%32%
2431
June1st to 15thDay
11%10%410%8%5%7%7%6%7%20%
2340
16th to endDay
8%7%48%10%5%7%7%6%9%22%
2340
July1st to 15thDay
10%7%49%10%5%9%7%7%7%20%
2340
16th to endDay
8%6%410%9%6%9%7%7%9%20%
2465
August1st to 15thDay
5%6%38%9%6%9%7%8%10%22%
2340
16th to endDay
12%8%38%9%5%7%7%7%9%20%
2106
September1st to 15thDay
8%7%39%9%6%7%6%7%9%23%
1980
16th to endDay
10%8%39%9%5%6%8%7%9%20%
1980
October1st to 15thDay
8%5%27%8%47%6%6%8%35%
1908
16th to endDay
8%5%25%7%46%45%7%42%
1920
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%313425%45%8%54%
1845
May1st to 15thNight
33244345%47%55%
1697
16th to endNight
6%214436%7%7%9%45%
1682
June1st to 15thNight
8%5%38%7%46%7%8%12%27%
1620
16th to endNight
6%5%27%8%47%6%9%9%30%
1620
July1st to 15thNight
7%7%37%8%47%6%9%10%28%
1620
16th to endNight
6%426%7%5%8%8%8%11%28%
1703
August1st to 15thNight
5%5%26%7%35%6%9%12%35%
1620
16th to endNight
10%6%36%6%46%6%8%12%29%
2080
September1st to 15thNight
7%6%38%7%47%7%9%10%26%
1980
16th to endNight
9%7%38%7%47%7%6%9%28%
1980
October1st to 15thNight
7%5%25%6%445%5%8%44%
2049
16th to endNight
9%5%25%42445%8%47%
2303
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
35%6%10%16%22%7%
2114
May1st to 15thDay
33%6%13%19%18%8%
2261
16th to endDay
45%9%14%17%11%1
2435
June1st to 15thDay
59%10%15%12%3
2340
16th to endDay
54%13%18%11%1
2340
July1st to 15thDay
59%13%17%6%1
2201
16th to endDay
56%13%18%9%1
2310
August1st to 15thDay
49%16%24%8%
2327
16th to endDay
56%15%19%7%1
2106
September1st to 15thDay
54%14%19%9%1
1980
16th to endDay
56%13%16%9%31
1980
October1st to 15thDay
42%9%12%16%13%5%
1908
16th to endDay
39%5%9%13%20%11%
1920
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%24%23%6%
1845
May1st to 15thNight
26%7%12%27%19%6%
1698
16th to endNight
30%10%19%22%16%
1684
June1st to 15thNight
46%13%21%14%4
1620
16th to endNight
44%16%22%12%4
1620
July1st to 15thNight
46%17%24%10%2
1530
16th to endNight
44%16%26%12%
1595
August1st to 15thNight
36%17%35%9%
1609
16th to endNight
44%18%27%8%1
2080
September1st to 15thNight
47%17%22%10%2
1980
16th to endNight
47%13%18%14%41
1980
October1st to 15thNight
34%9%14%17%18%4
2049
16th to endNight
34%6%11%14%22%10%
2303
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%30%27%19%
270
May1st to 15thDay
6%10%25%35%22%
288
16th to endDay
5%7%18%32%35%
331
June1st to 15thDay
16%110%11%20%39%
315
16th to endDay
8%27%19%60%
315
July1st to 15thDay
7%7%16%67%
305
16th to endDay
10%310%18%57%
326
August1st to 15thDay
7%28%17%62%
313
16th to endDay
12%139%20%54%
332
September1st to 15thDay
12%2310%22%48%
315
16th to endDay
11%110%35%41%
314
October1st to 15thDay
10%18%28%34%15%
315
16th to endDay
10%221%28%27%10%
336
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%43%23%
720
May1st to 15thNight
5%115%47%27%2
618
16th to endNight
6%8%35%41%6%
563
June1st to 15thNight
9%1425%44%14%
540
16th to endNight
7%212%45%30%
540
July1st to 15thNight
8%28%45%34%
510
16th to endNight
6%28%42%39%
564
August1st to 15thNight
8%7%43%38%
539
16th to endNight
13%6%15%35%29%
746
September1st to 15thNight
10%15%16%39%26%
720
16th to endNight
12%15%22%41%16%
717
October1st to 15thNight
12%10%35%36%5%
720
16th to endNight
13%117%36%27%4
768
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 2017-11-01 17:23:36. Version ac04

Copyright 2017 A. Danko


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