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 2017-12-20.

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%
15790
27%
48115
18%
15747
57%
15747
35%
27315

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
36%
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
59%
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
84%
531
46%
845
August1st to 15thNight
86%
539
27%
1789
33%
536
86%
536
49%
841
August16th to endNight
72%
573
21%
1916
25%
573
75%
573
32%
1122
September1st to 15thNight
75%
540
20%
1980
24%
540
76%
540
30%
1124
September16th to endNight
62%
537
23%
1980
24%
537
64%
537
26%
1178
October1st to 15thNight
66%
540
31%
1980
30%
540
70%
540
39%
979
October16th to endNight
57%
708
39%
2244
26%
708
66%
708
49%
1074
November1st to 15thNight
52%
861
26%
2381
14%
861
57%
861
39%
1374
November16th to endNight
49%
975
33%
2535
16%
975
57%
975
42%
1457
December1st to 15thNight
42%
975
29%
2535
15%
975
49%
975
34%
1580
December16th to endNight
37%
984
26%
2559
12%
984
45%
984
31%
1630

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%24424446%46%
48716
Night
11%413323346%53%
48317
Cloud CoverDay
12%5%2442445%6%46%
48714
Night
11%5%23323347%53%
48317
TransparencyDay
37%49%19%18%9%
48415
Night
31%411%20%19%12%
48121
SeeingDay
16%5%21%31%21%4
5623
Night
14%6%26%35%16%1
15796

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%
2160
16th to endDay
10%5%25%5%45%5%5%9%39%
2286
September1st to 15thDay
12%6%35%6%46%46%6%36%
1980
16th to endDay
13%6%25%6%3445%6%39%
1980
October1st to 15thDay
11%5%14434347%49%
1980
16th to endDay
9%41231234461%
1968
November1st to 15thDay
15%7%25%424346%44%
1804
16th to endDay
13%5%2432222356%
1755
December1st to 15thDay
17%7%24323345%46%
1755
16th to endDay
15%7%23313246%48%
1764
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%62%
1800
16th to endNight
7%424335%46%11%46%
1916
September1st to 15thNight
9%414335%35%10%47%
1980
16th to endNight
12%6%145%24446%46%
1980
October1st to 15thNight
11%4221325%6%59%
1980
16th to endNight
7%312212235%67%
2244
November1st to 15thNight
11%5%13322345%56%
2381
16th to endNight
11%412212335%59%
2535
December1st to 15thNight
16%6%23313336%50%
2535
16th to endNight
14%8%2422333450%
2559

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%
2160
16th to endDay
10%5%25%6%35%5%6%9%39%
2286
September1st to 15thDay
12%6%36%7%46%5%6%5%36%
1980
16th to endDay
13%7%26%5%35%5%5%6%40%
1980
October1st to 15thDay
11%5%14424447%48%
1980
16th to endDay
9%42331233461%
1968
November1st to 15thDay
14%7%25%424346%44%
1804
16th to endDay
12%6%2432332456%
1755
December1st to 15thDay
17%6%25%222345%46%
1755
16th to endDay
14%8%23312346%48%
1764
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
221332346%9%61%
1800
16th to endNight
7%424425%5%7%10%45%
1916
September1st to 15thNight
9%414335%35%10%47%
1980
16th to endNight
12%5%245%24447%46%
1980
October1st to 15thNight
11%312213247%59%
1980
16th to endNight
7%312212235%67%
2244
November1st to 15thNight
10%5%13322336%56%
2381
16th to endNight
10%5%12212235%60%
2535
December1st to 15thNight
15%6%22313346%51%
2535
16th to endNight
13%8%24323335%50%
2559

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
2147
16th to endDay
40%7%15%25%9%1
2286
September1st to 15thDay
46%5%10%18%16%2
1980
16th to endDay
43%5%10%17%15%8%
1980
October1st to 15thDay
34%411%20%20%8%
1980
16th to endDay
26%25%16%27%21%
1968
November1st to 15thDay
41%37%19%16%10%
1804
16th to endDay
34%2414%22%21%
1755
December1st to 15thDay
41%37%15%21%10%
1755
16th to endDay
37%26%17%23%11%
1764
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
17%5%21%36%17%
1789
16th to endNight
31%7%21%26%10%2
1916
September1st to 15thNight
32%6%15%22%18%3
1980
16th to endNight
38%5%13%19%15%7%
1980
October1st to 15thNight
26%314%26%18%10%
1980
16th to endNight
21%16%17%30%22%
2244
November1st to 15thNight
30%39%23%20%12%
2381
16th to endNight
27%36%16%22%23%
2535
December1st to 15thNight
35%38%18%21%13%
2535
16th to endNight
38%25%16%20%16%
2559

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
4342%39%9%
315
16th to endDay
13%28%35%29%10%
326
September1st to 15thDay
7%5%33%45%8%
135
16th to endDay
17%5%21%47%7%
135
October1st to 15thDay
8%7%41%35%7%
135
16th to endDay
13%419%34%23%4
144
November1st to 15thDay
30%425%22%14%1
135
16th to endDay
20%13%24%20%17%4
135
December1st to 15thDay
22%11%22%28%13%2
135
16th to endDay
27%12%30%25%4
108
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
3346%44%2
539
16th to endNight
9%7%43%36%2
573
September1st to 15thNight
9%6%42%37%3
540
16th to endNight
13%114%34%30%4
537
October1st to 15thNight
13%115%37%30%2
540
16th to endNight
9%425%33%24%2
708
November1st to 15thNight
15%422%35%18%2
861
16th to endNight
14%7%24%35%15%2
975
December1st to 15thNight
20%7%25%34%11%
975
16th to endNight
20%10%27%32%9%
984
Page generated at 2017-12-21 06:04:47. Version ac04

Copyright 2017 A. Danko


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