Lost Maples State Natural Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lost Maples State Natural Area 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
48%
15294
27%
46592
18%
15251
57%
15251
35%
26451

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
38%
895
27%
2327
12%
895
47%
895
33%
1439
January16th to endNight
39%
798
32%
2334
16%
798
52%
798
32%
1346
February1st to 15thNight
37%
704
30%
2107
14%
698
50%
698
34%
1153
February16th to endNight
26%
632
29%
1894
9%
632
43%
632
32%
1061
March1st to 15thNight
34%
618
28%
2058
14%
618
49%
618
29%
1186
March16th to endNight
30%
576
25%
2112
16%
576
44%
576
27%
1177
April1st to 15thNight
25%
539
25%
1928
12%
539
43%
539
28%
1074
April16th to endNight
26%
540
26%
1784
13%
540
45%
540
28%
1056
May1st to 15thNight
27%
540
22%
1620
13%
540
40%
540
29%
984
May16th to endNight
41%
562
23%
1684
16%
561
53%
561
31%
1038
June1st to 15thNight
61%
540
22%
1620
20%
540
68%
540
50%
813
June16th to endNight
58%
540
21%
1620
21%
540
63%
540
38%
920
July1st to 15thNight
68%
510
20%
1530
20%
510
72%
510
39%
864
July16th to endNight
81%
564
26%
1598
29%
531
83%
531
46%
845
August1st to 15thNight
85%
527
27%
1750
34%
524
86%
524
48%
827
August16th to endNight
73%
525
20%
1755
24%
525
75%
525
32%
1033
September1st to 15thNight
74%
495
20%
1815
24%
495
75%
495
28%
1062
September16th to endNight
64%
492
23%
1815
25%
492
66%
492
28%
1056
October1st to 15thNight
64%
495
33%
1815
32%
495
69%
495
38%
897
October16th to endNight
56%
649
37%
2057
25%
649
65%
649
47%
997
November1st to 15thNight
53%
793
29%
2193
15%
793
59%
793
42%
1228
November16th to endNight
48%
900
31%
2340
15%
900
56%
900
40%
1368
December1st to 15thNight
42%
900
30%
2340
16%
900
49%
900
35%
1450
December16th to endNight
37%
960
26%
2496
12%
960
45%
960
32%
1577

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%24424447%46%
47371
Night
11%413323346%53%
46794
Cloud CoverDay
13%5%2442445%6%46%
47369
Night
11%413323347%53%
46794
TransparencyDay
37%49%19%18%9%
47070
Night
31%411%20%19%12%
46598
SeeingDay
16%5%21%31%21%3
5215
Night
14%6%26%35%15%1
15300

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 15thDay
14%6%24323236%50%
1611
16th to endDay
12%5%13323336%54%
1899
February1st to 15thDay
12%6%23413345%53%
1750
16th to endDay
12%6%12323446%53%
1580
March1st to 15thDay
17%6%34212335%48%
1902
16th to endDay
18%424213336%49%
2112
April1st to 15thDay
15%5%1432335%5%47%
2015
16th to endDay
15%6%24413346%46%
2175
May1st to 15thDay
17%5%25%5%35%35%6%39%
2331
16th to endDay
20%5%24434447%36%
2430
June1st to 15thDay
8%42442445%9%49%
2340
16th to endDay
13%5%346%36%5%6%9%34%
2340
July1st to 15thDay
13%5%35%5%35%5%5%8%38%
2340
16th to endDay
9%4245%35%5%6%9%43%
2459
August1st to 15thDay
3213435%5%6%9%53%
2113
16th to endDay
11%5%25%5%45%5%6%9%38%
2095
September1st to 15thDay
13%6%36%7%47%45%6%34%
1815
16th to endDay
12%6%25%5%3445%6%41%
1815
October1st to 15thDay
12%5%14423346%49%
1815
16th to endDay
10%41231234460%
1804
November1st to 15thDay
14%6%25%423346%46%
1662
16th to endDay
14%5%2432222355%
1620
December1st to 15thDay
17%7%34322245%47%
1620
16th to endDay
14%7%23313247%49%
1728
January1st to 15thNight
14%5%23322335%52%
2327
16th to endNight
13%5%2332335%453%
2334
February1st to 15thNight
11%5%13312245%56%
2102
16th to endNight
12%5%2331335%7%52%
1894
March1st to 15thNight
14%6%14313246%51%
2058
16th to endNight
15%5%13223445%52%
2112
April1st to 15thNight
12%5%23233446%51%
1928
16th to endNight
13%5%25%423336%50%
1784
May1st to 15thNight
14%5%15%423346%48%
1619
16th to endNight
15%5%23323347%48%
1683
June1st to 15thNight
421231345%8%63%
1620
16th to endNight
8%32332345%8%52%
1620
July1st to 15thNight
7%3233245%7%10%49%
1620
16th to endNight
6%3123245%6%10%54%
1706
August1st to 15thNight
321242245%9%61%
1761
16th to endNight
8%424335%46%11%45%
1755
September1st to 15thNight
10%414335%35%10%44%
1815
16th to endNight
11%5%14424346%48%
1815
October1st to 15thNight
11%31221225%6%59%
1815
16th to endNight
8%312212235%66%
2057
November1st to 15thNight
10%5%12322245%58%
2193
16th to endNight
12%5%12212335%58%
2340
December1st to 15thNight
15%6%23312336%51%
2340
16th to endNight
14%7%24223335%50%
2496

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
13%6%24323236%50%
1611
16th to endDay
12%5%13323336%54%
1899
February1st to 15thDay
11%6%13323245%54%
1750
16th to endDay
12%5%13223346%53%
1580
March1st to 15thDay
17%6%15%212336%48%
1902
16th to endDay
17%424223235%49%
2110
April1st to 15thDay
15%5%14423346%47%
2015
16th to endDay
14%6%34413346%46%
2175
May1st to 15thDay
16%5%25%5%2436%6%40%
2331
16th to endDay
18%6%3443445%6%37%
2430
June1st to 15thDay
7%425%43445%8%50%
2340
16th to endDay
12%6%35%6%35%5%7%8%35%
2340
July1st to 15thDay
12%5%25%5%35%6%6%8%38%
2340
16th to endDay
9%424435%5%5%10%43%
2459
August1st to 15thDay
3213435%5%6%8%54%
2113
16th to endDay
11%5%25%6%35%5%6%9%38%
2095
September1st to 15thDay
13%6%36%7%46%5%6%5%34%
1815
16th to endDay
11%6%26%5%25%5%46%41%
1815
October1st to 15thDay
11%5%14423447%49%
1815
16th to endDay
9%412312335%61%
1804
November1st to 15thDay
13%7%24423346%46%
1662
16th to endDay
13%6%2432232454%
1620
December1st to 15thDay
17%7%25%222345%47%
1620
16th to endDay
13%8%23312346%49%
1728
January1st to 15thNight
15%424322335%52%
2327
16th to endNight
12%5%24323345%52%
2334
February1st to 15thNight
10%5%13312245%56%
2102
16th to endNight
11%5%1321335%7%53%
1894
March1st to 15thNight
13%6%23312336%51%
2058
16th to endNight
14%5%13213445%52%
2112
April1st to 15thNight
11%5%24323346%51%
1928
16th to endNight
11%6%24423336%49%
1784
May1st to 15thNight
14%5%24423346%48%
1619
16th to endNight
13%5%23313347%48%
1683
June1st to 15thNight
411231335%8%63%
1620
16th to endNight
7%31342445%9%52%
1620
July1st to 15thNight
7%22432446%10%49%
1620
16th to endNight
6%2122245%6%9%55%
1706
August1st to 15thNight
221332345%9%61%
1761
16th to endNight
8%424325%47%10%45%
1755
September1st to 15thNight
10%5%15%335%35%10%44%
1815
16th to endNight
11%5%245%24447%48%
1815
October1st to 15thNight
11%312213247%59%
1815
16th to endNight
8%312212235%66%
2057
November1st to 15thNight
9%5%13322336%59%
2193
16th to endNight
11%5%22212235%58%
2340
December1st to 15thNight
15%6%22312346%51%
2340
16th to endNight
13%8%24322335%50%
2496

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
37%1418%21%15%
1612
16th to endDay
33%26%14%26%17%
1899
February1st to 15thDay
34%35%13%21%20%
1751
16th to endDay
32%35%17%25%15%
1580
March1st to 15thDay
39%28%15%18%16%
1902
16th to endDay
39%26%18%19%12%
2112
April1st to 15thDay
38%37%15%18%16%
2015
16th to endDay
39%36%18%17%13%
2175
May1st to 15thDay
43%310%15%18%7%
2331
16th to endDay
46%5%9%17%16%4
2434
June1st to 15thDay
31%413%24%20%5%
2340
16th to endDay
44%6%11%19%15%3
2340
July1st to 15thDay
40%5%14%24%13%1
2201
16th to endDay
33%6%20%29%10%
2304
August1st to 15thDay
25%5%15%37%14%1
2100
16th to endDay
40%7%15%26%9%
2095
September1st to 15thDay
48%5%10%17%14%2
1815
16th to endDay
41%5%10%17%16%8%
1815
October1st to 15thDay
34%49%21%21%9%
1815
16th to endDay
26%25%17%28%19%
1804
November1st to 15thDay
39%36%19%18%11%
1662
16th to endDay
36%2412%20%23%
1620
December1st to 15thDay
40%27%15%21%11%
1620
16th to endDay
36%26%17%24%11%
1728
January1st to 15thNight
36%2417%20%19%
2327
16th to endNight
34%25%16%23%19%
2334
February1st to 15thNight
30%26%13%22%24%
2112
16th to endNight
31%37%15%24%17%
1894
March1st to 15thNight
36%27%14%20%18%
2058
16th to endNight
34%49%17%20%14%
2112
April1st to 15thNight
33%49%15%18%18%
1928
16th to endNight
36%410%17%16%14%
1784
May1st to 15thNight
37%312%19%15%11%
1620
16th to endNight
36%5%12%24%16%4
1685
June1st to 15thNight
19%5%16%28%25%4
1620
16th to endNight
29%5%18%25%17%3
1620
July1st to 15thNight
27%6%20%28%15%1
1530
16th to endNight
21%6%24%33%12%
1598
August1st to 15thNight
18%5%20%36%17%
1750
16th to endNight
32%7%22%26%10%1
1755
September1st to 15thNight
35%6%16%22%16%3
1815
16th to endNight
36%5%13%19%17%8%
1815
October1st to 15thNight
26%311%27%19%11%
1815
16th to endNight
22%16%17%30%21%
2057
November1st to 15thNight
28%38%24%21%13%
2193
16th to endNight
29%36%14%20%25%
2340
December1st to 15thNight
34%38%18%21%13%
2340
16th to endNight
37%25%16%20%16%
2496

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
21%6%46%20%41
90
16th to endDay
16%15%37%21%8%
96
February1st to 15thDay
15%18%28%22%13%1
90
16th to endDay
22%11%34%28%3
81
March1st to 15thDay
28%12%34%16%7%
90
16th to endDay
13%8%45%27%41
96
April1st to 15thDay
16%20%37%22%3
134
16th to endDay
16%12%43%22%5%
285
May1st to 15thDay
21%10%41%21%5%
468
16th to endDay
28%5%28%27%9%
517
June1st to 15thDay
10%121%42%22%1
495
16th to endDay
14%213%37%26%5%
495
July1st to 15thDay
12%212%36%30%5%
475
16th to endDay
9%1434%40%8%
508
August1st to 15thDay
4343%37%10%
300
16th to endDay
13%17%39%28%7%
263
September1st to 15thDay
8%6%28%43%12%
90
16th to endDay
8%6%14%58%11%
90
October1st to 15thDay
10%5%48%32%3
90
16th to endDay
16%215%36%28%1
96
November1st to 15thDay
28%5%33%17%12%2
90
16th to endDay
27%15%25%16%12%2
90
December1st to 15thDay
22%8%20%30%14%4
90
16th to endDay
23%13%32%25%5%
96
January1st to 15thNight
18%11%27%34%7%
900
16th to endNight
18%8%30%33%9%
798
February1st to 15thNight
16%12%30%31%7%
704
16th to endNight
17%11%42%26%2
632
March1st to 15thNight
20%7%34%30%6%
618
16th to endNight
18%9%39%27%4
576
April1st to 15thNight
14%10%48%24%2
539
16th to endNight
14%10%47%23%4
540
May1st to 15thNight
16%9%43%25%3
540
16th to endNight
16%433%34%10%
563
June1st to 15thNight
6%27%50%13%
540
16th to endNight
9%123%44%19%
540
July1st to 15thNight
8%15%49%24%
510
16th to endNight
6%15%52%31%2
564
August1st to 15thNight
3345%44%2
527
16th to endNight
10%6%44%36%2
525
September1st to 15thNight
10%6%41%37%3
495
16th to endNight
12%112%34%33%5%
492
October1st to 15thNight
13%216%37%28%2
495
16th to endNight
10%5%25%33%23%2
649
November1st to 15thNight
14%5%23%35%18%2
793
16th to endNight
15%7%25%35%14%2
900
December1st to 15thNight
19%8%26%33%11%
900
16th to endNight
20%10%27%32%9%
960
Page generated at 2017-08-13 13:16:37. Version ac04

Copyright 2017 A. Danko


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