Point Lookout State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Point Lookout State Park clear sky chart from 2005-11-05 to 2018-02-14.

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
45%
15922
20%
48823
13%
15886
53%
15886
26%
30938

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
29%
776
21%
2630
9%
776
44%
776
21%
1637
January16th to endNight
29%
832
22%
2704
11%
832
43%
832
23%
1702
February1st to 15thNight
28%
757
20%
2449
10%
757
41%
757
24%
1516
February16th to endNight
28%
631
26%
1893
12%
631
46%
631
27%
1167
March1st to 15thNight
38%
720
21%
2034
13%
720
48%
720
27%
1315
March16th to endNight
37%
768
21%
2064
12%
768
45%
768
28%
1380
April1st to 15thNight
41%
718
20%
1796
7%
718
48%
718
32%
1190
April16th to endNight
52%
720
20%
1800
9%
720
54%
720
32%
1181
May1st to 15thNight
46%
611
16%
1691
9%
611
50%
611
24%
1167
May16th to endNight
62%
374
18%
1497
20%
374
65%
374
23%
883
June1st to 15thNight
62%
360
18%
1440
21%
360
67%
360
24%
844
June16th to endNight
64%
360
15%
1440
18%
360
66%
360
22%
875
July1st to 15thNight
69%
340
13%
1360
18%
340
69%
340
21%
834
July16th to endNight
71%
536
17%
1567
16%
503
73%
503
30%
950
August1st to 15thNight
68%
578
15%
1648
11%
575
69%
575
28%
1084
August16th to endNight
69%
764
18%
1910
11%
764
70%
764
32%
1296
September1st to 15thNight
63%
720
23%
1800
15%
720
65%
720
34%
1194
September16th to endNight
55%
717
21%
1954
17%
717
57%
717
27%
1314
October1st to 15thNight
49%
720
22%
2160
19%
720
54%
720
25%
1407
October16th to endNight
43%
768
30%
2304
22%
768
55%
768
31%
1359
November1st to 15thNight
43%
760
21%
2433
14%
760
53%
760
26%
1506
November16th to endNight
42%
780
25%
2607
19%
780
53%
780
24%
1586
December1st to 15thNight
32%
780
18%
2730
10%
780
43%
780
20%
1751
December16th to endNight
29%
832
22%
2912
12%
832
44%
832
21%
1800

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
12%42442445%8%45%
49246
Night
14%5%2442445%7%43%
49006
Cloud CoverDay
13%42442445%8%45%
49256
Night
14%5%2442445%7%43%
49010
TransparencyDay
36%7%12%23%16%3
48946
Night
39%6%11%22%16%3
48823
SeeingDay
15%318%28%25%8%
6232
Night
16%5%24%31%18%2
15930

By Month

Percentage Cloud Cover NE (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%5%2442445%8%42%
1637
16th to endDay
16%6%2441345%5%44%
1872
February1st to 15thDay
14%7%3443435%7%41%
1713
16th to endDay
14%5%134345%6%7%42%
1580
March1st to 15thDay
16%5%13423447%45%
1912
16th to endDay
17%6%24324346%43%
2158
April1st to 15thDay
12%423324447%49%
2152
16th to endDay
13%5%23434337%47%
2160
May1st to 15thDay
13%5%145%2446%7%44%
2268
16th to endDay
11%4143245%5%9%46%
2618
June1st to 15thDay
10%312325%45%11%48%
2520
16th to endDay
6%324425%6%7%10%46%
2520
July1st to 15thDay
8%425%4345%7%11%43%
2520
16th to endDay
42245%35%7%8%11%43%
2491
August1st to 15thDay
8%5%25%5%245%7%9%42%
2289
16th to endDay
9%41442446%8%47%
2292
September1st to 15thDay
11%42442435%8%47%
2160
16th to endDay
16%7%35%424446%40%
2004
October1st to 15thDay
15%5%245%23345%46%
1800
16th to endDay
13%41432335%6%51%
1920
November1st to 15thDay
17%413423347%46%
1755
16th to endDay
13%324423345%50%
1681
December1st to 15thDay
14%6%2443346%6%43%
1560
16th to endDay
18%6%25%423436%41%
1664
January1st to 15thNight
15%5%234245%48%43%
2630
16th to endNight
17%6%2432344444%
2704
February1st to 15thNight
15%6%25%32335%6%44%
2448
16th to endNight
13%7%2431336%7%46%
1893
March1st to 15thNight
15%4233245%5%6%44%
2022
16th to endNight
18%6%25%323346%43%
2064
April1st to 15thNight
12%5%2442445%6%46%
1796
16th to endNight
16%423323447%46%
1800
May1st to 15thNight
14%6%35%5%25%46%8%38%
1691
16th to endNight
12%425%4235%5%7%45%
1495
June1st to 15thNight
11%414325%5%5%11%43%
1440
16th to endNight
6%5%35%6%36%5%7%9%40%
1440
July1st to 15thNight
7%5%26%5%45%5%7%10%38%
1440
16th to endNight
5%5%245%35%6%8%11%41%
1674
August1st to 15thNight
7%425%5%45%6%7%10%39%
1659
16th to endNight
10%6%145%25%5%6%8%42%
1910
September1st to 15thNight
12%5%15%5%2345%7%46%
1800
16th to endNight
15%5%25%42345%8%40%
1954
October1st to 15thNight
17%5%25%423447%42%
2160
16th to endNight
14%5%13322446%50%
2304
November1st to 15thNight
16%5%24423345%47%
2433
16th to endNight
13%5%2442445%7%45%
2607
December1st to 15thNight
16%7%2442445%6%40%
2730
16th to endNight
15%7%35%41335%6%43%
2912

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
14%5%2343445%7%42%
1637
16th to endDay
16%6%2441345%5%44%
1872
February1st to 15thDay
15%6%345%24447%41%
1713
16th to endDay
14%5%24325%5%5%7%42%
1580
March1st to 15thDay
16%5%2431345%7%45%
1923
16th to endDay
18%424323446%44%
2157
April1st to 15thDay
12%423324447%50%
2152
16th to endDay
13%5%24423437%47%
2160
May1st to 15thDay
14%42443446%7%44%
2268
16th to endDay
12%4134235%5%9%46%
2618
June1st to 15thDay
11%21242445%11%48%
2520
16th to endDay
6%3135%35%6%7%10%45%
2520
July1st to 15thDay
8%324425%5%6%11%43%
2520
16th to endDay
5%2245%36%6%9%12%41%
2491
August1st to 15thDay
10%425%4245%7%9%42%
2289
16th to endDay
11%3145%2446%8%46%
2292
September1st to 15thDay
12%424434447%48%
2160
16th to endDay
17%6%35%433446%39%
2004
October1st to 15thDay
17%5%25%423345%45%
1800
16th to endDay
13%31442335%5%51%
1920
November1st to 15thDay
18%5%13324346%46%
1755
16th to endDay
13%325%413446%51%
1681
December1st to 15thDay
15%6%25%32345%6%43%
1560
16th to endDay
18%5%26%423437%41%
1664
January1st to 15thNight
15%5%15%42345%7%41%
2630
16th to endNight
18%6%24324345%44%
2704
February1st to 15thNight
15%7%2432335%7%44%
2441
16th to endNight
13%6%3442335%6%46%
1893
March1st to 15thNight
16%4134235%5%6%44%
2034
16th to endNight
18%7%34423336%43%
2064
April1st to 15thNight
13%415%5%25%447%45%
1796
16th to endNight
17%324323337%47%
1800
May1st to 15thNight
15%6%345%25%45%8%37%
1690
16th to endNight
13%3245%33448%46%
1495
June1st to 15thNight
11%3134345%6%9%45%
1440
16th to endNight
7%427%5%36%6%5%9%41%
1440
July1st to 15thNight
8%425%6%26%6%7%10%38%
1440
16th to endNight
6%4345%25%6%7%10%43%
1674
August1st to 15thNight
7%435%5%346%8%9%40%
1659
16th to endNight
11%4245%25%46%9%42%
1910
September1st to 15thNight
14%42432445%7%46%
1800
16th to endNight
16%5%25%4245%5%8%40%
1954
October1st to 15thNight
17%6%24333346%42%
2160
16th to endNight
15%413313346%51%
2304
November1st to 15thNight
16%5%24423345%47%
2433
16th to endNight
14%5%2433445%6%46%
2607
December1st to 15thNight
16%6%35%424446%40%
2730
16th to endNight
16%5%35%32335%7%42%
2912

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%12%21%13%4
1638
16th to endDay
40%411%23%16%3
1872
February1st to 15thDay
42%49%24%15%2
1715
16th to endDay
38%6%12%23%16%2
1580
March1st to 15thDay
37%6%13%24%15%3
1923
16th to endDay
40%5%10%22%17%3
2158
April1st to 15thDay
33%5%11%26%17%5%
2152
16th to endDay
36%5%9%21%18%7%
2160
May1st to 15thDay
38%7%13%24%14%1
2268
16th to endDay
33%8%15%26%13%1
2622
June1st to 15thDay
30%8%17%28%13%1
2520
16th to endDay
30%10%17%23%16%2
2520
July1st to 15thDay
33%11%15%22%14%2
2371
16th to endDay
28%12%17%23%15%1
2335
August1st to 15thDay
35%8%14%25%14%1
2276
16th to endDay
32%9%14%23%16%3
2292
September1st to 15thDay
34%7%15%21%18%3
2160
16th to endDay
44%5%9%19%19%1
2004
October1st to 15thDay
40%5%9%25%16%2
1800
16th to endDay
34%5%7%28%21%3
1920
November1st to 15thDay
39%5%10%21%18%4
1755
16th to endDay
34%5%9%25%20%3
1681
December1st to 15thDay
39%6%13%22%14%3
1560
16th to endDay
44%5%10%23%14%1
1664
January1st to 15thNight
40%5%11%21%16%4
2630
16th to endNight
42%410%24%16%2
2704
February1st to 15thNight
39%5%9%25%18%2
2449
16th to endNight
37%410%25%19%3
1893
March1st to 15thNight
39%6%10%27%13%3
2034
16th to endNight
42%410%22%16%3
2064
April1st to 15thNight
37%6%10%20%20%4
1796
16th to endNight
38%5%10%20%19%5%
1800
May1st to 15thNight
42%8%12%21%13%1
1691
16th to endNight
36%7%15%25%13%1
1497
June1st to 15thNight
35%9%13%26%14%1
1440
16th to endNight
37%9%14%17%18%2
1440
July1st to 15thNight
38%10%17%19%13%1
1360
16th to endNight
31%10%16%27%13%
1567
August1st to 15thNight
37%9%16%20%15%
1648
16th to endNight
36%8%14%20%18%1
1910
September1st to 15thNight
36%7%14%20%18%3
1800
16th to endNight
40%8%10%19%19%2
1954
October1st to 15thNight
41%6%8%23%16%3
2160
16th to endNight
34%49%26%21%3
2304
November1st to 15thNight
40%410%22%17%5%
2433
16th to endNight
37%6%6%25%19%4
2607
December1st to 15thNight
44%5%12%21%13%2
2730
16th to endNight
42%412%23%14%3
2912

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%336%34%10%
110
16th to endDay
19%5%24%35%15%
144
February1st to 15thDay
22%8%22%37%9%
149
16th to endDay
14%6%37%32%8%
239
March1st to 15thDay
18%6%27%35%11%
270
16th to endDay
19%430%29%12%3
288
April1st to 15thDay
14%427%31%20%2
270
16th to endDay
17%6%15%24%29%5%
270
May1st to 15thDay
22%321%34%14%3
288
16th to endDay
19%12%24%26%16%
331
June1st to 15thDay
13%211%29%27%16%
315
16th to endDay
8%18%35%37%8%
315
July1st to 15thDay
9%8%30%42%8%
305
16th to endDay
6%5%25%46%15%
326
August1st to 15thDay
12%19%26%38%11%
313
16th to endDay
9%5%25%43%15%
332
September1st to 15thDay
14%11%25%30%16%
315
16th to endDay
23%217%19%26%10%
314
October1st to 15thDay
23%212%26%23%12%
315
16th to endDay
10%5%25%25%24%8%
336
November1st to 15thDay
21%424%22%22%5%
290
16th to endDay
14%8%27%28%14%5%
211
December1st to 15thDay
21%7%22%26%20%2
90
16th to endDay
25%431%33%6%
96
January1st to 15thNight
18%11%34%26%8%
780
16th to endNight
21%10%34%28%4
832
February1st to 15thNight
18%9%37%30%3
760
16th to endNight
16%12%37%28%3
631
March1st to 15thNight
18%6%32%33%9%
720
16th to endNight
20%430%32%8%2
768
April1st to 15thNight
13%335%34%12%
718
16th to endNight
18%320%38%17%1
720
May1st to 15thNight
17%324%36%15%1
611
16th to endNight
14%214%32%30%5%
375
June1st to 15thNight
10%116%32%32%5%
360
16th to endNight
6%115%40%32%4
360
July1st to 15thNight
10%6%38%38%5%
340
16th to endNight
7%17%35%41%6%
536
August1st to 15thNight
10%17%38%38%4
578
16th to endNight
13%16%32%38%7%
764
September1st to 15thNight
14%111%28%36%7%
720
16th to endNight
20%113%29%29%5%
717
October1st to 15thNight
21%418%26%23%5%
720
16th to endNight
16%8%28%24%18%2
768
November1st to 15thNight
18%6%25%29%16%3
760
16th to endNight
15%11%25%31%14%1
780
December1st to 15thNight
20%9%32%22%13%2
780
16th to endNight
20%7%37%28%5%
832
Page generated at 2018-02-15 10:58:39. Version ac04

Copyright 2018 A. Danko


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