Deep Creek Lake State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Deep Creek Lake State Park clear sky chart from 2005-11-06 to 2024-01-12.

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
29%
23492
15%
74824
8%
23437
36%
23437
15%
53343

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
9%
757
13%
2459
4%
757
20%
757
6%
1901
January11th to 20thNight
8%
725
8%
2354
1%
725
16%
725
6%
1946
January21st to endNight
9%
792
11%
2574
3%
792
18%
792
6%
2011
February1st to 10thNight
11%
720
12%
2340
4%
720
21%
720
8%
1765
February11th to 20thNight
5%
703
8%
2275
1%
700
14%
700
6%
1766
February21st to endNight
9%
592
16%
1747
3%
592
23%
592
8%
1348
March1st to 10thNight
16%
720
17%
1980
6%
720
26%
720
14%
1448
March11th to 20thNight
17%
720
15%
1980
8%
720
24%
720
12%
1449
March21st to endNight
17%
792
16%
2178
6%
792
26%
792
14%
1611
April1st to 10thNight
18%
720
13%
1859
4%
720
25%
720
16%
1388
April11th to 20thNight
26%
711
15%
1775
6%
711
31%
711
20%
1279
April21st to endNight
25%
604
18%
1684
6%
604
33%
604
18%
1186
May1st to 10thNight
31%
540
14%
1620
7%
540
38%
540
18%
1150
May11th to 20thNight
32%
531
14%
1592
9%
531
37%
531
17%
1151
May21st to endNight
48%
433
15%
1596
14%
433
54%
433
22%
1013
June1st to 10thNight
49%
360
16%
1440
16%
360
57%
360
20%
901
June11th to 20thNight
44%
360
15%
1440
16%
360
50%
360
17%
930
June21st to endNight
43%
360
16%
1440
13%
360
52%
360
21%
880
July1st to 10thNight
50%
418
13%
1468
13%
418
54%
418
22%
942
July11th to 20thNight
59%
522
15%
1566
13%
522
60%
522
29%
996
July21st to endNight
54%
591
16%
1672
12%
558
58%
558
27%
1077
August1st to 10thNight
56%
537
16%
1600
13%
534
58%
534
25%
1053
August11th to 20thNight
58%
534
19%
1598
14%
534
61%
534
27%
1040
August21st to endNight
56%
746
19%
1934
11%
746
58%
746
31%
1277
September1st to 10thNight
50%
720
21%
1800
10%
720
54%
720
30%
1222
September11th to 20thNight
54%
720
26%
1923
19%
720
57%
720
33%
1206
September21st to endNight
41%
720
19%
2010
14%
720
46%
720
22%
1387
October1st to 10thNight
41%
720
18%
2160
15%
720
47%
720
22%
1435
October11th to 20thNight
32%
720
20%
2160
11%
720
44%
720
21%
1429
October21st to endNight
24%
792
21%
2376
10%
792
37%
792
17%
1652
November1st to 10thNight
32%
740
23%
2221
13%
740
44%
740
22%
1457
November11th to 20thNight
21%
760
17%
2597
10%
760
33%
760
13%
1826
November21st to endNight
18%
760
14%
2660
6%
760
30%
760
11%
1938
December1st to 10thNight
14%
760
9%
2660
4%
760
21%
760
7%
2100
December11th to 20thNight
13%
760
10%
3234
4%
759
21%
759
5%
2410
December21st to endNight
13%
832
7%
4852
4%
817
21%
817
4%
3773

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
14%9%5%8%7%45%5%6%7%31%
74596
Night
12%9%5%8%7%45%5%5%7%33%
75108
TransparencyDay
50%9%11%18%10%2
74316
Night
48%10%11%19%11%2
74907
SeeingDay
25%19%26%17%9%3
13696
Night
23%19%25%22%10%1
23501

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
11%10%7%12%8%5%7%5%6%6%21%
1706
11th to 20thDay
13%13%7%14%10%5%45%5%6%19%
1629
21st to endDay
10%13%9%13%9%4445%7%21%
1782
February1st to 10thDay
12%13%7%10%10%446%6%6%23%
1620
11th to 20thDay
14%9%5%12%9%47%5%6%7%22%
1573
21st to endDay
13%12%6%12%8%5%5%5%4426%
1503
March1st to 10thDay
12%7%6%8%7%5%6%5%5%6%34%
1980
11th to 20thDay
15%12%5%8%6%45%6%6%7%28%
1980
21st to endDay
16%13%5%9%7%3435%6%27%
2178
April1st to 10thDay
12%11%6%8%5%45%6%5%8%30%
2100
11th to 20thDay
15%9%5%7%5%345%5%6%36%
2134
21st to endDay
18%9%47%6%4445%7%31%
2290
May1st to 10thDay
18%10%38%6%46%6%6%7%27%
2340
11th to 20thDay
22%7%37%6%45%5%5%7%29%
2301
21st to endDay
13%7%36%6%46%6%6%8%33%
2677
June1st to 10thDay
12%7%46%6%46%6%8%8%34%
2520
11th to 20thDay
14%6%37%7%46%7%6%9%30%
2520
21st to endDay
11%6%36%6%5%6%7%6%10%34%
2520
July1st to 10thDay
11%7%37%6%46%6%6%8%35%
2443
11th to 20thDay
9%6%37%7%47%6%7%9%35%
2340
21st to endDay
12%6%5%7%7%37%7%7%8%31%
2547
August1st to 10thDay
11%6%47%7%5%7%8%8%9%28%
2327
11th to 20thDay
13%7%36%7%5%6%6%6%10%31%
2303
21st to endDay
12%6%36%6%46%7%6%8%35%
2403
September1st to 10thDay
15%5%36%7%45%5%6%6%40%
2160
11th to 20thDay
11%7%36%6%346%6%8%40%
2034
21st to endDay
17%9%37%6%35%5%5%7%34%
1949
October1st to 10thDay
14%9%35%6%45%45%7%39%
1800
11th to 20thDay
16%13%37%5%345%5%5%36%
1800
21st to endDay
15%12%37%6%34446%36%
1980
November1st to 10thDay
10%8%45%5%35%45%7%44%
1857
11th to 20thDay
11%11%5%10%6%35%5%6%6%31%
1578
21st to endDay
14%12%7%8%7%45%446%28%
1520
December1st to 10thDay
15%13%7%14%7%36%5%5%5%20%
1520
11th to 20thDay
13%13%7%13%7%45%445%25%
1910
21st to endDay
15%11%9%11%7%45%5%7%6%19%
2772
January1st to 10thNight
9%11%7%12%9%5%8%6%5%6%24%
2459
11th to 20thNight
13%12%7%14%10%46%5%45%19%
2354
21st to endNight
12%9%7%11%9%5%7%6%5%6%24%
2574
February1st to 10thNight
11%8%5%10%9%5%6%5%7%7%28%
2340
11th to 20thNight
12%9%5%11%11%47%6%5%7%23%
2273
21st to endNight
13%11%6%10%8%45%5%5%6%27%
1747
March1st to 10thNight
11%9%5%8%6%45%6%5%7%33%
1980
11th to 20thNight
15%9%5%8%6%35%45%7%33%
1980
21st to endNight
14%10%5%8%6%45%5%5%5%33%
2178
April1st to 10thNight
12%10%6%9%6%45%5%46%34%
1859
11th to 20thNight
11%8%48%6%46%5%5%7%37%
1775
21st to endNight
14%9%47%6%45%446%38%
1684
May1st to 10thNight
17%8%36%5%35%5%6%8%33%
1620
11th to 20thNight
19%8%36%6%35%448%34%
1592
21st to endNight
8%7%25%6%36%6%7%10%39%
1595
June1st to 10thNight
9%7%35%6%46%5%6%8%41%
1440
11th to 20thNight
11%6%36%7%446%7%9%36%
1440
21st to endNight
9%5%36%5%45%5%7%13%38%
1440
July1st to 10thNight
9%7%35%5%35%5%7%9%41%
1512
11th to 20thNight
7%5%25%7%446%5%8%47%
1620
21st to endNight
9%5%25%7%35%7%7%10%39%
1771
August1st to 10thNight
8%6%36%6%46%5%8%9%39%
1611
11th to 20thNight
9%7%25%6%5%45%5%9%43%
1598
21st to endNight
10%5%25%6%445%5%8%46%
1934
September1st to 10thNight
12%7%26%5%345%5%7%45%
1800
11th to 20thNight
10%7%26%42445%7%49%
1923
21st to endNight
15%9%36%5%45%45%7%38%
2010
October1st to 10thNight
14%8%25%5%45%5%37%42%
2160
11th to 20thNight
12%10%36%5%445%6%7%39%
2160
21st to endNight
16%11%46%6%43445%37%
2376
November1st to 10thNight
9%10%46%6%35%446%44%
2221
11th to 20thNight
12%10%6%8%7%45%5%5%6%32%
2597
21st to endNight
13%10%6%9%7%36%5%5%6%30%
2660
December1st to 10thNight
15%11%7%14%7%5%6%445%22%
2660
11th to 20thNight
14%9%5%13%8%5%6%5%5%6%24%
3285
21st to endNight
14%13%8%12%7%46%6%5%6%19%
4880

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
59%11%10%13%6%2
1707
11th to 20thDay
63%11%9%13%5%1
1629
21st to endDay
63%7%9%12%7%1
1782
February1st to 10thDay
58%10%10%15%6%
1620
11th to 20thDay
58%9%11%13%8%
1582
21st to endDay
58%9%8%14%9%2
1503
March1st to 10thDay
49%7%11%21%11%1
1980
11th to 20thDay
52%9%11%17%9%2
1980
21st to endDay
56%7%7%18%10%2
2178
April1st to 10thDay
49%9%11%16%12%3
2100
11th to 20thDay
47%8%11%15%16%3
2134
21st to endDay
51%8%10%20%10%2
2290
May1st to 10thDay
54%9%9%16%10%1
2340
11th to 20thDay
53%9%10%16%9%2
2305
21st to endDay
46%11%14%20%8%1
2677
June1st to 10thDay
44%11%12%21%12%1
2520
11th to 20thDay
46%12%11%21%9%1
2520
21st to endDay
42%11%13%23%9%1
2520
July1st to 10thDay
44%11%11%20%13%2
2377
11th to 20thDay
42%10%13%22%12%1
2271
21st to endDay
45%12%11%19%12%1
2405
August1st to 10thDay
46%13%14%18%8%
2314
11th to 20thDay
45%10%13%22%10%
2303
21st to endDay
43%11%12%21%11%2
2403
September1st to 10thDay
43%8%11%18%16%3
2160
11th to 20thDay
40%7%11%25%14%3
2034
21st to endDay
47%7%11%20%14%1
1949
October1st to 10thDay
43%9%10%22%14%3
1800
11th to 20thDay
49%6%10%22%13%
1800
21st to endDay
48%8%10%20%13%2
1980
November1st to 10thDay
39%8%9%22%17%5%
1857
11th to 20thDay
49%9%9%15%14%3
1578
21st to endDay
55%8%11%16%10%1
1520
December1st to 10thDay
64%9%9%12%5%1
1520
11th to 20thDay
57%9%9%19%5%1
1906
21st to endDay
58%11%13%10%7%
2772
January1st to 10thNight
56%11%10%14%7%2
2459
11th to 20thNight
64%10%8%12%5%1
2354
21st to endNight
57%11%10%14%6%2
2574
February1st to 10thNight
53%12%10%17%8%1
2340
11th to 20thNight
59%9%10%13%9%
2275
21st to endNight
55%11%8%15%8%3
1747
March1st to 10thNight
46%11%9%21%11%2
1980
11th to 20thNight
49%9%11%20%10%1
1980
21st to endNight
50%9%8%18%12%3
2178
April1st to 10thNight
51%7%9%17%13%2
1859
11th to 20thNight
44%9%12%17%14%4
1775
21st to endNight
46%8%10%24%10%3
1684
May1st to 10thNight
47%9%12%19%10%3
1620
11th to 20thNight
48%10%11%16%14%1
1593
21st to endNight
37%12%17%24%9%1
1596
June1st to 10thNight
38%11%11%25%14%1
1440
11th to 20thNight
42%10%13%24%10%1
1440
21st to endNight
36%12%15%23%13%1
1440
July1st to 10thNight
36%14%13%23%11%3
1468
11th to 20thNight
34%11%14%24%15%2
1566
21st to endNight
34%13%16%23%14%1
1672
August1st to 10thNight
37%11%17%23%11%1
1600
11th to 20thNight
36%11%14%26%13%1
1598
21st to endNight
35%10%14%25%13%2
1934
September1st to 10thNight
38%9%13%21%15%4
1800
11th to 20thNight
33%8%12%27%18%2
1923
21st to endNight
44%8%12%20%16%
2010
October1st to 10thNight
41%9%11%24%14%2
2160
11th to 20thNight
41%9%10%25%15%1
2160
21st to endNight
46%8%9%22%13%2
2376
November1st to 10thNight
41%8%10%20%16%6%
2221
11th to 20thNight
50%8%8%18%14%2
2597
21st to endNight
53%9%10%16%10%2
2660
December1st to 10thNight
61%10%9%14%42
2660
11th to 20thNight
56%10%10%15%8%1
3288
21st to endNight
60%12%11%11%6%
4880

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
42%27%22%6%3
270
11th to 20thDay
40%30%24%5%1
243
21st to endDay
38%35%22%5%2
264
February1st to 10thDay
41%29%26%31
240
11th to 20thDay
48%27%23%2
240
21st to endDay
42%31%22%5%1
275
March1st to 10thDay
34%28%26%10%2
420
11th to 20thDay
37%27%21%11%31
420
21st to endDay
34%24%26%13%3
462
April1st to 10thDay
30%24%27%14%5%
420
11th to 20thDay
27%21%28%14%7%3
412
21st to endDay
34%25%24%11%5%1
420
May1st to 10thDay
34%19%27%13%43
423
11th to 20thDay
28%21%26%17%6%3
447
21st to endDay
19%16%27%21%11%6%
485
June1st to 10thDay
16%18%29%22%10%4
450
11th to 20thDay
20%16%28%19%12%4
450
21st to endDay
12%17%32%24%12%3
450
July1st to 10thDay
13%8%29%25%16%9%
445
11th to 20thDay
8%10%34%28%14%7%
444
21st to endDay
15%11%27%26%14%7%
488
August1st to 10thDay
12%12%26%25%17%7%
446
11th to 20thDay
16%10%25%25%14%10%
439
21st to endDay
13%9%28%26%15%9%
495
September1st to 10thDay
17%10%24%24%16%9%
450
11th to 20thDay
14%8%27%24%20%7%
450
21st to endDay
25%14%26%19%12%4
450
October1st to 10thDay
21%13%27%24%13%2
450
11th to 20thDay
25%20%27%20%7%
450
21st to endDay
30%24%25%15%6%
495
November1st to 10thDay
23%19%29%18%9%2
455
11th to 20thDay
29%28%28%10%5%
210
21st to endDay
35%28%26%8%21
180
December1st to 10thDay
39%30%21%7%22
180
11th to 20thDay
41%27%22%8%2
180
21st to endDay
37%27%22%11%3
198
January1st to 10thNight
33%31%24%10%3
760
11th to 20thNight
32%31%25%12%1
725
21st to endNight
33%30%25%11%1
792
February1st to 10thNight
32%26%28%14%1
720
11th to 20thNight
34%34%24%7%
703
21st to endNight
33%29%26%10%1
592
March1st to 10thNight
28%25%28%17%2
720
11th to 20thNight
33%23%24%14%5%1
720
21st to endNight
23%25%31%16%41
792
April1st to 10thNight
24%26%30%17%3
720
11th to 20thNight
21%19%30%21%8%1
711
21st to endNight
25%18%26%24%6%
604
May1st to 10thNight
23%16%26%27%9%
540
11th to 20thNight
23%13%26%25%11%1
531
21st to endNight
10%11%25%29%23%2
435
June1st to 10thNight
11%11%25%36%16%1
360
11th to 20thNight
14%11%24%31%19%1
360
21st to endNight
11%8%32%34%14%1
360
July1st to 10thNight
10%9%23%33%22%4
418
11th to 20thNight
7%8%20%36%25%4
522
21st to endNight
10%8%22%34%25%2
591
August1st to 10thNight
10%6%19%37%25%2
537
11th to 20thNight
11%7%16%38%24%4
534
21st to endNight
11%7%20%36%23%3
746
September1st to 10thNight
16%6%23%31%21%4
720
11th to 20thNight
13%8%18%34%23%3
720
21st to endNight
20%13%19%28%17%2
720
October1st to 10thNight
19%14%22%25%18%2
720
11th to 20thNight
22%17%27%25%9%1
720
21st to endNight
28%21%24%20%6%1
792
November1st to 10thNight
19%18%26%26%9%1
740
11th to 20thNight
28%21%25%18%6%1
760
21st to endNight
28%22%28%18%41
760
December1st to 10thNight
33%24%23%14%5%
760
11th to 20thNight
31%28%23%16%2
760
21st to endNight
30%27%26%16%2
836
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