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Fort Meade Recreation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fort Meade Recreation Area clear sky chart from 2005-11-06 to 2024-11-05.

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
42%
25708
22%
97957
13%
25471
51%
25471
27%
52658

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
36%
937
25%
4334
12%
926
48%
926
19%
2322
January11th to 20thNight
32%
947
22%
4294
10%
930
43%
930
17%
2450
January21st to endNight
29%
1034
15%
4578
7%
1023
41%
1023
18%
2366
February1st to 10thNight
30%
794
17%
2504
9%
794
40%
794
21%
1611
February11th to 20thNight
32%
740
21%
2267
11%
740
42%
740
25%
1387
February21st to endNight
35%
628
21%
1884
9%
628
45%
628
30%
1143
March1st to 10thNight
37%
752
28%
3652
10%
744
48%
744
21%
1889
March11th to 20thNight
39%
742
21%
3662
14%
731
47%
731
24%
1664
March21st to endNight
37%
619
11%
3435
13%
605
45%
605
12%
2209
April1st to 10thNight
38%
570
18%
1900
13%
570
48%
570
24%
1162
April11th to 20thNight
30%
563
19%
1877
11%
563
43%
563
24%
1132
April21st to endNight
40%
570
18%
1758
13%
570
48%
570
27%
1090
May1st to 10thNight
44%
568
20%
2570
13%
559
51%
559
20%
1581
May11th to 20thNight
46%
554
17%
2440
12%
541
50%
541
24%
1218
May21st to endNight
35%
606
12%
2742
7%
593
40%
593
19%
1607
June1st to 10thNight
50%
570
16%
1520
8%
570
54%
570
37%
911
June11th to 20thNight
40%
570
14%
1520
6%
570
44%
570
35%
932
June21st to endNight
54%
570
17%
1520
8%
570
58%
570
43%
854
July1st to 10thNight
60%
546
18%
2217
9%
535
65%
535
36%
1047
July11th to 20thNight
60%
539
20%
2077
13%
533
66%
533
40%
994
July21st to endNight
66%
608
21%
2253
19%
569
70%
569
40%
1067
August1st to 10thNight
63%
559
22%
2273
19%
545
68%
545
28%
1294
August11th to 20thNight
61%
555
19%
2744
23%
543
71%
543
31%
1274
August21st to endNight
63%
617
26%
3055
31%
605
72%
605
35%
1287
September1st to 10thNight
65%
570
31%
1900
31%
570
74%
570
45%
917
September11th to 20thNight
59%
570
30%
1976
27%
570
69%
570
40%
976
September21st to endNight
50%
570
31%
2090
28%
570
60%
570
37%
1004
October1st to 10thNight
46%
660
44%
3220
19%
652
55%
652
31%
1199
October11th to 20thNight
41%
762
21%
3423
12%
756
53%
756
26%
1650
October21st to endNight
35%
1032
26%
4202
9%
1022
45%
1022
26%
2123
November1st to 10thNight
38%
950
26%
2470
12%
950
46%
950
34%
1509
November11th to 20thNight
37%
950
32%
2484
13%
950
49%
950
35%
1468
November21st to endNight
35%
950
27%
2660
11%
950
49%
950
35%
1492
December1st to 10thNight
31%
950
24%
2660
9%
950
44%
950
29%
1599
December11th to 20thNight
35%
948
27%
3082
11%
948
46%
948
31%
1635
December21st to endNight
31%
1038
15%
4714
7%
1026
44%
1026
17%
2595

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
6%5%25%44446%8%52%
105264
Night
5%5%25%44446%8%52%
102464
TransparencyDay
28%7%15%28%18%5%
105009
Night
28%7%14%28%19%4
102309
SeeingDay
12%12%30%29%14%3
15939
Night
10%12%30%34%12%1
25897

By Month

Percentage Cloud Cover SW (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
1416%445%47%11%53%
2538
11th to 20thDay
1437%6%6%5%45%8%51%
2540
21st to endDay
1327%445%46%7%56%
2794
February1st to 10thDay
310%47%5%7%5%5%7%8%39%
1694
11th to 20thDay
37%310%5%5%6%46%8%44%
1799
21st to endDay
36%48%6%5%5%46%10%44%
1570
March1st to 10thDay
26%26%44446%8%54%
3130
11th to 20thDay
5%7%2433435%10%54%
3255
21st to endDay
10%14%38%43435%8%36%
4165
April1st to 10thDay
10%10%36%335%46%8%43%
2280
11th to 20thDay
10%9%37%5%6%5%5%6%8%37%
2251
21st to endDay
11%8%26%5%5%447%7%40%
2422
May1st to 10thDay
11%8%38%6%5%6%45%7%36%
4244
11th to 20thDay
10%5%25%445%46%10%45%
4388
21st to endDay
13%6%25%44447%9%41%
4825
June1st to 10thDay
7%424445%5%7%10%48%
2660
11th to 20thDay
7%424445%5%7%10%48%
2660
21st to endDay
342323437%7%61%
2660
July1st to 10thDay
3314445%5%8%10%53%
4430
11th to 20thDay
321323446%8%64%
4430
21st to endDay
3212335%47%9%62%
4802
August1st to 10thDay
5%325%45%5%5%7%9%51%
4411
11th to 20thDay
5%31434447%10%53%
3915
21st to endDay
421223435%7%67%
4180
September1st to 10thDay
6%41333335%7%62%
2280
11th to 20thDay
7%41333345%6%63%
2204
21st to endDay
8%414333347%60%
2090
October1st to 10thDay
6%313223235%71%
3304
11th to 20thDay
9%313223346%63%
3090
21st to endDay
7%6%2423347%9%53%
3091
November1st to 10thDay
45%243345%6%8%56%
1709
11th to 20thDay
35%25%43446%9%54%
1693
21st to endDay
36%25%5%4436%9%52%
1520
December1st to 10thDay
15%27%5%5%5%6%7%9%48%
1520
11th to 20thDay
232444447%10%55%
1926
21st to endDay
6%8%37%44435%8%49%
2794
January1st to 10thNight
1437%5%5%6%5%7%8%49%
4417
11th to 20thNight
1329%6%6%7%5%7%8%46%
4430
21st to endNight
1426%5%5%5%5%6%9%54%
4873
February1st to 10thNight
49%39%5%5%5%5%7%9%41%
2504
11th to 20thNight
28%37%5%5%5%47%9%43%
2267
21st to endNight
37%36%5%5%5%5%7%8%46%
1884
March1st to 10thNight
37%26%45%5%47%8%49%
3734
11th to 20thNight
5%6%2444445%10%52%
3700
21st to endNight
9%10%39%5%5%6%46%9%34%
3477
April1st to 10thNight
10%8%25%5%445%5%8%44%
1900
11th to 20thNight
10%7%36%445%45%7%45%
1877
21st to endNight
10%7%25%445%36%7%45%
1758
May1st to 10thNight
10%8%37%5%4445%7%44%
2711
11th to 20thNight
7%5%1434447%10%49%
2517
21st to endNight
13%6%26%5%3446%9%42%
2762
June1st to 10thNight
8%5%2344446%10%51%
1520
11th to 20thNight
7%5%1445%448%9%48%
1520
21st to endNight
7%31424446%8%56%
1520
July1st to 10thNight
421343447%9%58%
2540
11th to 20thNight
3213235%47%10%60%
2540
21st to endNight
331333447%10%59%
2761
August1st to 10thNight
7%416%445%5%7%9%49%
2528
11th to 20thNight
5%32433446%11%55%
2920
21st to endNight
321433435%6%65%
3487
September1st to 10thNight
5%31433335%7%64%
1900
11th to 20thNight
6%32432436%7%60%
1976
21st to endNight
9%313333346%61%
2090
October1st to 10thNight
6%413222235%71%
3660
11th to 20thNight
7%4142335%5%7%59%
3806
21st to endNight
7%6%2433435%8%54%
4467
November1st to 10thNight
5%6%26%445%46%8%50%
2470
11th to 20thNight
35%26%44447%8%53%
2484
21st to endNight
35%2444437%8%55%
2660
December1st to 10thNight
26%37%5%45%47%9%49%
2660
11th to 20thNight
2415%5%45%46%10%54%
3271
21st to endNight
6%9%25%44446%7%48%
4873

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
24%9%22%29%14%1
2539
11th to 20thDay
29%9%18%30%11%4
2540
21st to endDay
25%9%20%31%14%1
2794
February1st to 10thDay
40%9%14%21%14%2
1694
11th to 20thDay
37%8%15%21%15%4
1809
21st to endDay
35%6%15%26%13%4
1570
March1st to 10thDay
27%6%11%27%25%4
3130
11th to 20thDay
25%7%19%34%14%1
3255
21st to endDay
45%9%19%21%6%
4165
April1st to 10thDay
38%5%18%25%11%3
2280
11th to 20thDay
41%7%15%25%10%2
2254
21st to endDay
40%7%17%26%10%1
2422
May1st to 10thDay
42%8%14%25%9%2
4244
11th to 20thDay
32%7%15%30%14%2
4392
21st to endDay
36%9%16%28%11%1
4825
June1st to 10thDay
29%10%20%26%13%2
2660
11th to 20thDay
29%6%20%27%15%3
2660
21st to endDay
20%6%16%31%23%5%
2660
July1st to 10thDay
22%7%14%31%24%3
4361
11th to 20thDay
17%5%11%30%27%10%
4355
21st to endDay
16%6%11%28%29%11%
4651
August1st to 10thDay
26%7%16%23%18%10%
4396
11th to 20thDay
25%7%16%27%21%4
3955
21st to endDay
16%5%12%27%30%11%
4179
September1st to 10thDay
22%49%27%28%10%
2280
11th to 20thDay
22%5%10%31%25%7%
2204
21st to endDay
24%49%33%25%4
2090
October1st to 10thDay
18%39%21%33%16%
3304
11th to 20thDay
23%412%33%25%4
3090
21st to endDay
27%6%15%31%17%4
3091
November1st to 10thDay
24%6%14%27%23%5%
1709
11th to 20thDay
26%5%12%30%22%4
1693
21st to endDay
28%6%13%31%18%3
1520
December1st to 10thDay
29%9%15%28%17%2
1520
11th to 20thDay
23%8%18%38%12%2
1924
21st to endDay
34%5%9%30%19%2
2794
January1st to 10thNight
30%10%13%31%15%2
4417
11th to 20thNight
34%8%14%27%14%2
4430
21st to endNight
23%13%17%30%15%2
4873
February1st to 10thNight
38%10%15%21%14%2
2504
11th to 20thNight
35%7%14%25%15%3
2267
21st to endNight
34%6%13%26%14%6%
1884
March1st to 10thNight
29%9%10%28%22%2
3734
11th to 20thNight
26%7%20%28%18%1
3700
21st to endNight
43%11%18%20%7%1
3477
April1st to 10thNight
38%7%15%24%15%3
1900
11th to 20thNight
37%6%12%27%16%2
1877
21st to endNight
35%8%14%28%14%1
1758
May1st to 10thNight
38%8%11%24%18%1
2711
11th to 20thNight
27%9%16%35%13%
2518
21st to endNight
36%10%12%29%12%1
2762
June1st to 10thNight
28%8%19%30%13%2
1520
11th to 20thNight
29%8%21%23%15%3
1520
21st to endNight
23%7%17%26%22%5%
1520
July1st to 10thNight
20%6%15%30%25%3
2500
11th to 20thNight
18%6%13%33%24%6%
2492
21st to endNight
18%5%14%30%25%8%
2674
August1st to 10thNight
30%7%14%20%20%9%
2520
11th to 20thNight
24%6%20%25%22%4
2946
21st to endNight
18%5%12%25%30%9%
3487
September1st to 10thNight
20%5%7%29%28%11%
1900
11th to 20thNight
23%5%10%27%26%9%
1976
21st to endNight
25%48%29%26%8%
2090
October1st to 10thNight
19%39%23%30%17%
3660
11th to 20thNight
24%6%10%30%26%5%
3806
21st to endNight
28%413%29%18%8%
4467
November1st to 10thNight
30%6%14%24%20%6%
2470
11th to 20thNight
27%6%11%28%22%5%
2484
21st to endNight
26%6%14%29%20%4
2660
December1st to 10thNight
30%8%13%29%16%4
2660
11th to 20thNight
24%8%14%39%14%1
3272
21st to endNight
35%7%10%32%14%2
4873

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
9%12%31%26%14%8%
270
11th to 20thDay
17%14%28%26%11%4
270
21st to endDay
12%27%30%21%8%2
297
February1st to 10thDay
14%19%42%19%6%1
270
11th to 20thDay
13%16%38%27%7%
270
21st to endDay
9%20%39%25%5%2
225
March1st to 10thDay
12%17%39%20%10%3
270
11th to 20thDay
12%14%36%22%14%3
308
21st to endDay
21%13%31%24%9%2
506
April1st to 10thDay
22%14%34%25%5%1
460
11th to 20thDay
22%19%37%18%3
452
21st to endDay
19%12%29%26%12%2
602
May1st to 10thDay
18%14%30%22%13%3
653
11th to 20thDay
20%9%24%26%15%5%
675
21st to endDay
19%10%32%24%11%5%
734
June1st to 10thDay
9%9%27%32%18%5%
680
11th to 20thDay
11%12%33%30%12%2
680
21st to endDay
8%9%29%32%18%3
680
July1st to 10thDay
5%425%41%22%3
671
11th to 20thDay
47%31%37%19%3
668
21st to endDay
5%6%26%37%23%4
739
August1st to 10thDay
6%5%30%39%17%4
676
11th to 20thDay
6%7%28%37%17%5%
551
21st to endDay
5%10%27%34%19%6%
539
September1st to 10thDay
7%8%28%37%16%5%
490
11th to 20thDay
8%7%29%33%18%6%
414
21st to endDay
16%11%29%26%12%7%
300
October1st to 10thDay
17%11%22%27%16%6%
300
11th to 20thDay
20%15%27%21%13%5%
300
21st to endDay
13%22%27%23%13%2
330
November1st to 10thDay
13%18%35%18%12%4
282
11th to 20thDay
14%14%36%21%12%3
270
21st to endDay
12%21%24%27%13%2
270
December1st to 10thDay
14%18%34%24%8%3
270
11th to 20thDay
13%17%37%24%9%
270
21st to endDay
12%15%35%27%8%1
297
January1st to 10thNight
7%18%32%29%13%1
950
11th to 20thNight
11%21%31%26%9%2
950
21st to endNight
9%22%34%27%7%1
1045
February1st to 10thNight
11%19%34%28%8%1
794
11th to 20thNight
8%18%36%28%9%1
744
21st to endNight
9%12%38%31%9%1
628
March1st to 10thNight
11%13%35%32%8%1
760
11th to 20thNight
9%10%34%35%10%1
751
21st to endNight
16%10%29%35%9%1
627
April1st to 10thNight
15%11%32%33%8%
570
11th to 20thNight
18%13%34%28%6%1
563
21st to endNight
14%12%29%33%11%1
570
May1st to 10thNight
13%9%28%34%14%2
570
11th to 20thNight
16%7%24%36%15%2
561
21st to endNight
18%8%33%29%11%1
617
June1st to 10thNight
11%7%28%38%15%1
570
11th to 20thNight
11%7%38%34%10%
570
21st to endNight
9%6%27%46%12%
570
July1st to 10thNight
6%325%45%20%1
555
11th to 20thNight
4327%50%15%
552
21st to endNight
3223%53%18%
624
August1st to 10thNight
5%322%53%16%1
567
11th to 20thNight
5%425%45%21%1
564
21st to endNight
4423%44%22%2
627
September1st to 10thNight
6%421%46%19%3
570
11th to 20thNight
9%6%22%43%18%2
570
21st to endNight
12%8%27%37%15%1
570
October1st to 10thNight
15%10%24%34%16%1
672
11th to 20thNight
13%12%29%31%12%1
776
21st to endNight
13%16%31%28%10%2
1045
November1st to 10thNight
9%15%34%31%9%2
950
11th to 20thNight
11%17%31%31%9%1
950
21st to endNight
8%20%33%30%8%1
950
December1st to 10thNight
9%20%34%27%9%1
950
11th to 20thNight
8%16%35%31%9%1
950
21st to endNight
14%18%32%28%8%1
1045
Page generated at 2024-11-03 00:11:27. Version ac07

Copyright © 2024 Attilla Danko.


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