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 2017-08-12.

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%
15175
20%
46523
13%
15139
53%
15139
26%
29502

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%
716
21%
2427
9%
716
43%
716
21%
1528
January16th to endNight
27%
768
21%
2496
10%
768
41%
768
22%
1583
February1st to 15thNight
28%
701
21%
2269
10%
701
42%
701
24%
1392
February16th to endNight
28%
631
26%
1893
12%
631
45%
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
47%
611
16%
1691
9%
611
50%
611
24%
1167
May16th to endNight
61%
374
18%
1497
20%
374
64%
374
23%
883
June1st to 15thNight
64%
360
18%
1440
21%
360
69%
360
24%
844
June16th to endNight
64%
360
15%
1440
18%
360
67%
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
69%
563
15%
1611
12%
560
70%
560
29%
1052
August16th to endNight
69%
700
17%
1750
10%
700
69%
700
32%
1187
September1st to 15thNight
64%
660
24%
1650
16%
660
66%
660
33%
1096
September16th to endNight
54%
657
18%
1791
15%
657
56%
657
26%
1219
October1st to 15thNight
48%
660
24%
1980
21%
660
54%
660
26%
1280
October16th to endNight
42%
704
27%
2112
19%
704
53%
704
29%
1267
November1st to 15thNight
42%
700
22%
2241
15%
700
53%
700
27%
1361
November16th to endNight
41%
720
23%
2406
17%
720
51%
720
22%
1495
December1st to 15thNight
32%
720
19%
2520
10%
720
44%
720
20%
1605
December16th to endNight
30%
768
22%
2688
12%
768
45%
768
21%
1651

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%
47442
Night
14%5%2442445%7%43%
46706
Cloud CoverDay
13%42442445%8%45%
47452
Night
14%5%2442445%7%43%
46710
TransparencyDay
36%7%13%23%16%3
47142
Night
39%6%11%22%16%3
46523
SeeingDay
15%318%28%25%8%
5633
Night
16%5%24%31%18%2
15183

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
15%5%3442445%8%42%
1510
16th to endDay
16%6%2441345%5%43%
1728
February1st to 15thDay
14%7%3443435%7%42%
1592
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%245%245%7%9%43%
2241
16th to endDay
10%5%2442446%8%47%
2100
September1st to 15thDay
11%32442435%8%47%
1980
16th to endDay
16%6%35%424447%38%
1837
October1st to 15thDay
14%5%245%23445%47%
1650
16th to endDay
13%5%1432335%6%49%
1760
November1st to 15thDay
17%313423347%48%
1617
16th to endDay
14%334423346%48%
1552
December1st to 15thDay
13%6%3442346%6%43%
1440
16th to endDay
19%6%25%423336%41%
1536
January1st to 15thNight
16%5%235%245%48%41%
2427
16th to endNight
17%6%24324445%44%
2496
February1st to 15thNight
15%6%25%323346%46%
2268
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%
1622
16th to endNight
10%6%145%36%5%6%8%42%
1750
September1st to 15thNight
12%415%5%2345%7%46%
1650
16th to endNight
16%6%25%42345%8%38%
1791
October1st to 15thNight
16%5%25%423437%43%
1980
16th to endNight
15%5%13322446%49%
2112
November1st to 15thNight
15%5%24423245%49%
2241
16th to endNight
14%5%2442445%7%44%
2406
December1st to 15thNight
16%6%3442445%6%41%
2520
16th to endNight
16%6%3441335%6%43%
2688

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%23434447%43%
1510
16th to endDay
16%6%2441445%5%43%
1728
February1st to 15thDay
14%6%345%24447%41%
1592
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%43%
2241
16th to endDay
11%4145%2446%8%46%
2100
September1st to 15thDay
12%42443445%7%47%
1980
16th to endDay
18%6%35%43445%6%38%
1837
October1st to 15thDay
16%425%423345%46%
1650
16th to endDay
13%41443335%5%50%
1760
November1st to 15thDay
18%413324346%48%
1617
16th to endDay
14%325%413446%49%
1552
December1st to 15thDay
14%6%2432345%6%44%
1440
16th to endDay
19%5%26%413336%41%
1536
January1st to 15thNight
16%5%25%5%235%5%7%40%
2427
16th to endNight
18%6%24324345%43%
2496
February1st to 15thNight
14%7%2432335%6%45%
2261
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%
1622
16th to endNight
11%4245%26%5%6%8%42%
1750
September1st to 15thNight
14%32442445%7%47%
1650
16th to endNight
17%5%25%4235%5%8%38%
1791
October1st to 15thNight
17%6%24323446%43%
1980
16th to endNight
15%413413346%50%
2112
November1st to 15thNight
16%5%24423245%49%
2241
16th to endNight
15%5%2433445%6%44%
2406
December1st to 15thNight
16%6%35%424445%42%
2520
16th to endNight
17%5%35%32335%6%43%
2688

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
41%6%11%22%14%3
1511
16th to endDay
41%410%24%15%3
1728
February1st to 15thDay
41%49%25%16%2
1594
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
33%8%14%25%15%1
2228
16th to endDay
33%9%13%23%16%3
2100
September1st to 15thDay
34%7%16%20%17%3
1980
16th to endDay
45%6%10%18%19%1
1837
October1st to 15thDay
39%5%9%25%17%2
1650
16th to endDay
35%5%7%27%20%3
1760
November1st to 15thDay
38%5%10%21%19%4
1617
16th to endDay
36%5%10%24%19%3
1552
December1st to 15thDay
38%6%13%22%15%3
1440
16th to endDay
44%410%22%15%2
1536
January1st to 15thNight
41%6%11%20%16%3
2427
16th to endNight
42%410%24%15%2
2496
February1st to 15thNight
38%48%26%18%2
2269
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
36%9%16%20%16%
1611
16th to endNight
36%9%14%19%18%1
1750
September1st to 15thNight
35%8%14%18%19%3
1650
16th to endNight
41%8%10%17%19%2
1791
October1st to 15thNight
41%6%8%24%16%3
1980
16th to endNight
35%49%25%20%3
2112
November1st to 15thNight
39%310%22%18%5%
2241
16th to endNight
39%6%7%24%16%5%
2406
December1st to 15thNight
43%5%12%21%13%2
2520
16th to endNight
41%412%22%14%3
2688

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
16%234%42%4
73
16th to endDay
21%6%30%32%9%
96
February1st to 15thDay
19%6%25%38%10%
108
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%18%26%39%12%
297
16th to endDay
10%5%24%41%17%
268
September1st to 15thDay
13%112%21%31%19%
255
16th to endDay
25%216%20%25%8%
254
October1st to 15thDay
21%314%29%23%7%
255
16th to endDay
11%6%27%24%25%5%
272
November1st to 15thDay
20%5%27%20%21%5%
242
16th to endDay
16%9%25%30%13%5%
172
December1st to 15thDay
16%8%21%31%20%1
60
16th to endDay
31%329%28%7%
64
January1st to 15thNight
18%10%35%26%7%
720
16th to endNight
21%10%36%27%3
768
February1st to 15thNight
17%9%37%31%3
704
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%16%38%38%4
563
16th to endNight
13%16%32%39%8%
700
September1st to 15thNight
13%111%27%38%7%
660
16th to endNight
20%113%30%29%4
657
October1st to 15thNight
20%419%26%23%4
660
16th to endNight
17%9%27%25%18%1
704
November1st to 15thNight
18%7%26%28%15%3
700
16th to endNight
16%12%25%30%13%1
720
December1st to 15thNight
19%9%33%22%13%2
720
16th to endNight
21%7%37%27%5%
768
Page generated at 2017-08-13 14:16:58. Version ac04

Copyright 2017 A. Danko


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