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 2005-11-06 to 2024-03-18.

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
46%
23817
20%
80324
14%
23730
54%
23730
24%
49825

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 10thNight
28%
750
24%
4289
10%
737
45%
737
15%
2328
January11th to 20thNight
32%
758
26%
3962
11%
740
45%
740
14%
2273
January21st to endNight
30%
825
16%
4453
14%
814
45%
814
15%
2756
February1st to 10thNight
34%
760
20%
2470
14%
760
44%
760
24%
1552
February11th to 20thNight
25%
740
20%
2280
9%
739
40%
739
23%
1471
February21st to endNight
32%
628
25%
1884
13%
628
47%
628
26%
1194
March1st to 10thNight
37%
760
23%
2176
14%
760
49%
760
29%
1366
March11th to 20thNight
38%
752
22%
2068
13%
752
47%
752
28%
1359
March21st to endNight
39%
792
21%
2108
11%
792
47%
792
28%
1414
April1st to 10thNight
37%
720
19%
1800
6%
720
44%
720
29%
1226
April11th to 20thNight
50%
711
22%
1775
9%
711
55%
711
35%
1143
April21st to endNight
48%
720
20%
1800
9%
720
50%
720
31%
1187
May1st to 10thNight
47%
700
16%
1780
8%
700
50%
700
27%
1229
May11th to 20thNight
50%
393
17%
1455
15%
393
53%
393
20%
923
May21st to endNight
61%
388
18%
1551
19%
388
65%
388
22%
940
June1st to 10thNight
61%
360
18%
1440
22%
360
66%
360
23%
856
June11th to 20thNight
65%
360
17%
1440
20%
360
67%
360
21%
888
June21st to endNight
69%
360
16%
1440
19%
360
73%
360
23%
847
July1st to 10thNight
67%
350
16%
1400
21%
350
68%
350
21%
848
July11th to 20thNight
77%
394
18%
1438
21%
394
78%
394
28%
818
July21st to endNight
69%
591
17%
1672
15%
558
70%
558
29%
1065
August1st to 10thNight
70%
537
15%
1600
12%
534
70%
534
26%
1043
August11th to 20thNight
63%
680
15%
1744
10%
680
64%
680
28%
1208
August21st to endNight
66%
792
17%
1980
10%
792
67%
792
32%
1355
September1st to 10thNight
64%
720
22%
1800
14%
720
66%
720
33%
1201
September11th to 20thNight
67%
720
27%
1800
20%
720
68%
720
37%
1139
September21st to endNight
49%
720
18%
2030
15%
720
53%
720
22%
1411
October1st to 10thNight
52%
720
19%
2160
18%
720
56%
720
27%
1385
October11th to 20thNight
46%
720
26%
2160
22%
720
55%
720
29%
1326
October21st to endNight
43%
792
26%
2376
19%
792
53%
792
30%
1447
November1st to 10thNight
48%
740
23%
2347
17%
740
58%
740
29%
1392
November11th to 20thNight
39%
760
24%
2470
17%
760
49%
760
25%
1524
November21st to endNight
44%
760
26%
2574
19%
760
57%
760
28%
1472
December1st to 10thNight
32%
760
20%
2660
11%
760
45%
760
20%
1686
December11th to 20thNight
31%
760
21%
3176
12%
759
44%
759
19%
1912
December21st to endNight
36%
824
15%
4766
15%
817
49%
817
15%
2641

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
13%5%25%5%345%6%8%45%
78711
Night
14%6%25%5%3445%7%44%
81079
TransparencyDay
36%7%13%24%16%3
78421
Night
39%6%11%23%17%3
80888
SeeingDay
15%316%29%26%11%
14221
Night
16%6%24%32%19%3
23856

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 10thDay
16%5%2342335%8%50%
2558
11th to 20thDay
13%8%36%5%3445%5%43%
2840
21st to endDay
14%9%47%6%3445%6%39%
3124
February1st to 10thDay
13%7%35%6%35%5%6%8%39%
1710
11th to 20thDay
19%6%243235%5%7%45%
1786
21st to endDay
17%6%35%5%35%5%5%7%38%
1570
March1st to 10thDay
15%5%2432345%7%49%
2000
11th to 20thDay
16%6%2442446%7%45%
2058
21st to endDay
17%5%25%4345%5%7%42%
2246
April1st to 10thDay
12%5%2433445%8%50%
2160
11th to 20thDay
10%4245%34447%51%
2134
21st to endDay
14%6%3442445%8%46%
2160
May1st to 10thDay
14%6%2443446%9%43%
2195
11th to 20thDay
15%5%244345%6%8%42%
2437
21st to endDay
13%4245%345%6%9%45%
2725
June1st to 10thDay
11%424435%45%11%47%
2520
11th to 20thDay
10%4236%345%7%12%45%
2520
21st to endDay
8%324435%6%7%11%47%
2520
July1st to 10thDay
8%425%5%35%6%6%10%45%
2520
11th to 20thDay
6%3245%35%6%9%12%46%
2469
21st to endDay
8%3245%46%7%9%10%41%
2547
August1st to 10thDay
9%5%25%435%6%9%11%41%
2327
11th to 20thDay
10%5%25%6%36%5%7%9%42%
2139
21st to endDay
11%425%5%345%6%9%47%
2376
September1st to 10thDay
13%4244345%6%7%49%
2160
11th to 20thDay
13%5%35%5%34348%48%
2160
21st to endDay
18%6%35%44445%6%41%
1926
October1st to 10thDay
17%5%25%42345%6%48%
1800
11th to 20thDay
17%5%14423446%51%
1800
21st to endDay
13%6%25%43435%6%49%
1980
November1st to 10thDay
14%5%14434346%53%
1730
11th to 20thDay
14%5%2442445%7%47%
1710
21st to endDay
15%325%5%2345%6%51%
1602
December1st to 10thDay
15%6%35%42446%8%43%
1520
11th to 20thDay
16%7%24423335%50%
1910
21st to endDay
15%6%36%5%3445%7%42%
2772
January1st to 10thNight
14%8%25%5%3345%7%44%
4385
11th to 20thNight
16%7%26%434346%45%
4120
21st to endNight
18%9%46%5%23345%41%
4532
February1st to 10thNight
15%8%25%43445%6%43%
2470
11th to 20thNight
19%7%2442345%7%42%
2279
21st to endNight
17%8%35%42345%6%45%
1884
March1st to 10thNight
15%5%2442445%6%48%
2176
11th to 20thNight
18%6%234345%6%7%42%
2068
21st to endNight
16%8%35%4235%47%42%
2108
April1st to 10thNight
15%6%25%5%36%5%48%42%
1800
11th to 20thNight
12%5%245%2445%8%48%
1775
21st to endNight
18%425%435%447%45%
1800
May1st to 10thNight
15%6%36%5%35%5%6%8%39%
1780
11th to 20thNight
16%6%35%5%345%5%7%41%
1454
21st to endNight
14%5%25%5%3445%9%43%
1550
June1st to 10thNight
13%424445%5%6%8%44%
1440
11th to 20thNight
11%5%25%6%45%6%6%10%41%
1440
21st to endNight
7%426%5%38%7%6%10%42%
1440
July1st to 10thNight
9%336%6%36%6%8%9%40%
1440
11th to 20thNight
5%5%345%36%7%8%11%44%
1486
21st to endNight
7%5%36%6%35%6%7%11%41%
1771
August1st to 10thNight
8%5%35%6%45%6%8%10%39%
1611
11th to 20thNight
10%6%35%5%35%6%7%9%39%
1744
21st to endNight
10%5%35%6%46%5%6%8%41%
1980
September1st to 10thNight
15%5%2443446%6%48%
1800
11th to 20thNight
11%425%425%5%6%9%48%
1800
21st to endNight
20%6%25%5%346%5%6%38%
2030
October1st to 10thNight
16%7%25%4335%5%7%44%
2160
11th to 20thNight
18%5%24324336%50%
2160
21st to endNight
16%5%24424447%48%
2376
November1st to 10thNight
14%5%25%423346%51%
2347
11th to 20thNight
16%6%25%43435%5%47%
2470
21st to endNight
13%42443445%7%50%
2574
December1st to 10thNight
17%8%35%5%2445%6%41%
2660
11th to 20thNight
17%5%36%42435%6%44%
3285
21st to endNight
14%7%35%5%345%6%8%41%
4884

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 10thDay
35%5%9%34%15%3
2559
11th to 20thDay
42%5%10%21%19%5%
2840
21st to endDay
46%6%11%23%13%2
3124
February1st to 10thDay
42%5%12%26%13%2
1710
11th to 20thDay
39%6%9%22%19%5%
1795
21st to endDay
45%5%14%17%16%4
1570
March1st to 10thDay
35%6%12%25%20%3
2000
11th to 20thDay
39%6%11%21%18%6%
2058
21st to endDay
42%7%11%20%17%4
2246
April1st to 10thDay
33%5%15%22%19%6%
2160
11th to 20thDay
33%6%12%23%21%5%
2134
21st to endDay
37%6%12%24%16%6%
2160
May1st to 10thDay
38%7%13%24%15%3
2195
11th to 20thDay
38%9%14%23%13%2
2441
21st to endDay
34%9%16%28%12%1
2725
June1st to 10thDay
32%8%17%29%13%2
2520
11th to 20thDay
30%11%18%23%16%2
2520
21st to endDay
29%10%16%24%18%1
2520
July1st to 10thDay
32%11%15%23%16%2
2450
11th to 20thDay
26%12%20%27%13%2
2394
21st to endDay
32%11%17%22%16%1
2405
August1st to 10thDay
33%10%18%27%11%1
2314
11th to 20thDay
36%10%16%23%14%1
2139
21st to endDay
33%9%16%24%14%4
2376
September1st to 10thDay
34%8%17%21%16%4
2160
11th to 20thDay
35%6%11%26%19%3
2160
21st to endDay
44%6%9%21%17%3
1926
October1st to 10thDay
38%6%11%24%18%3
1800
11th to 20thDay
35%5%9%26%21%3
1800
21st to endDay
36%5%8%26%21%5%
1980
November1st to 10thDay
34%5%10%26%20%4
1730
11th to 20thDay
37%6%11%19%22%5%
1710
21st to endDay
36%410%28%19%4
1602
December1st to 10thDay
40%6%13%24%13%3
1520
11th to 20thDay
39%49%28%16%5%
1906
21st to endDay
41%6%14%26%13%1
2772
January1st to 10thNight
39%410%25%18%4
4385
11th to 20thNight
42%49%25%18%3
4120
21st to endNight
46%5%7%24%16%2
4532
February1st to 10thNight
41%5%11%24%16%2
2470
11th to 20thNight
42%5%8%21%19%5%
2281
21st to endNight
41%410%22%18%5%
1884
March1st to 10thNight
37%6%10%26%18%3
2176
11th to 20thNight
40%6%11%21%19%4
2068
21st to endNight
43%5%10%22%16%5%
2108
April1st to 10thNight
41%6%11%17%20%5%
1800
11th to 20thNight
34%6%11%21%22%6%
1775
21st to endNight
39%6%13%23%15%5%
1800
May1st to 10thNight
41%8%12%22%14%3
1780
11th to 20thNight
42%8%15%19%15%1
1455
21st to endNight
39%8%14%26%12%1
1551
June1st to 10thNight
37%8%12%25%16%2
1440
11th to 20thNight
37%11%13%24%13%2
1440
21st to endNight
34%10%16%20%17%2
1440
July1st to 10thNight
36%11%17%19%14%3
1400
11th to 20thNight
29%11%19%28%11%1
1438
21st to endNight
34%11%17%25%13%
1672
August1st to 10thNight
37%11%18%22%12%
1600
11th to 20thNight
38%11%17%20%13%1
1744
21st to endNight
38%9%15%20%16%2
1980
September1st to 10thNight
36%8%15%20%16%4
1800
11th to 20thNight
32%8%12%24%21%2
1800
21st to endNight
45%8%10%17%17%3
2030
October1st to 10thNight
39%6%10%23%18%3
2160
11th to 20thNight
37%5%8%24%22%3
2160
21st to endNight
37%410%25%19%4
2376
November1st to 10thNight
36%5%11%25%18%5%
2347
11th to 20thNight
40%5%9%21%20%6%
2470
21st to endNight
33%6%10%27%21%4
2574
December1st to 10thNight
44%5%11%23%13%3
2660
11th to 20thNight
42%411%22%18%4
3288
21st to endNight
39%6%15%27%12%2
4884

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 10thDay
18%425%40%12%1
193
11th to 20thDay
15%7%28%37%12%
270
21st to endDay
17%422%41%15%1
297
February1st to 10thDay
17%5%16%46%15%1
270
11th to 20thDay
24%5%28%33%9%1
394
21st to endDay
21%5%26%36%10%1
382
March1st to 10thDay
17%5%27%35%13%2
460
11th to 20thDay
17%5%24%39%12%2
449
21st to endDay
18%5%25%33%16%3
462
April1st to 10thDay
15%5%25%35%18%3
420
11th to 20thDay
9%418%35%27%7%
412
21st to endDay
16%5%20%32%25%2
420
May1st to 10thDay
17%417%32%24%5%
423
11th to 20thDay
17%212%33%27%8%
447
21st to endDay
18%37%24%32%17%
485
June1st to 10thDay
11%28%28%31%20%
450
11th to 20thDay
10%28%27%38%15%
450
21st to endDay
8%28%25%39%17%
450
July1st to 10thDay
11%2423%36%24%
445
11th to 20thDay
415%15%49%27%
444
21st to endDay
8%26%24%42%18%
488
August1st to 10thDay
11%17%23%40%19%
446
11th to 20thDay
10%27%22%39%20%
439
21st to endDay
10%25%24%36%23%
495
September1st to 10thDay
15%18%20%31%25%
450
11th to 20thDay
13%37%22%35%21%
450
21st to endDay
24%316%22%25%10%
450
October1st to 10thDay
19%410%26%26%15%
450
11th to 20thDay
18%216%28%27%9%
450
21st to endDay
15%5%21%31%23%6%
495
November1st to 10thDay
16%422%30%20%8%
395
11th to 20thDay
14%6%30%29%18%3
370
21st to endDay
14%6%24%30%21%5%
262
December1st to 10thDay
18%326%35%17%2
180
11th to 20thDay
20%5%23%33%17%1
180
21st to endDay
18%323%36%18%3
198
January1st to 10thNight
18%12%37%28%6%
760
11th to 20thNight
20%9%32%30%9%
760
21st to endNight
19%10%35%31%4
836
February1st to 10thNight
18%6%34%35%6%
760
11th to 20thNight
20%11%39%27%3
743
21st to endNight
20%8%33%33%41
628
March1st to 10thNight
17%6%34%34%9%1
760
11th to 20thNight
19%6%32%34%9%2
752
21st to endNight
18%5%29%37%9%1
792
April1st to 10thNight
17%6%35%31%11%1
720
11th to 20thNight
14%426%39%17%1
711
21st to endNight
20%422%39%14%1
720
May1st to 10thNight
16%5%24%39%15%2
700
11th to 20thNight
15%5%21%39%19%1
393
21st to endNight
15%310%30%37%5%
389
June1st to 10thNight
12%216%32%34%4
360
11th to 20thNight
12%212%37%31%6%
360
21st to endNight
6%212%41%34%5%
360
July1st to 10thNight
10%110%33%38%8%
350
11th to 20thNight
416%32%47%10%
394
21st to endNight
7%28%35%43%5%
591
August1st to 10thNight
9%27%39%37%6%
537
11th to 20thNight
11%310%32%36%7%
680
21st to endNight
13%28%30%37%10%
792
September1st to 10thNight
15%28%28%36%10%
720
11th to 20thNight
12%310%28%39%8%
720
21st to endNight
22%316%31%26%3
720
October1st to 10thNight
19%417%27%26%7%
720
11th to 20thNight
19%6%23%29%22%2
720
21st to endNight
19%7%26%28%17%3
792
November1st to 10thNight
16%5%24%34%17%4
740
11th to 20thNight
18%8%29%31%13%1
760
21st to endNight
13%10%28%33%14%2
760
December1st to 10thNight
20%7%34%27%10%2
760
11th to 20thNight
18%7%37%28%9%
760
21st to endNight
18%8%31%33%10%
836
Page generated at 2024-03-15 14:01:43. Version ac07

Copyright © 2024 Attilla Danko.


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