Mother Neff State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mother Neff State Park clear sky chart from 2005-11-05 to 2017-09-19.

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
51%
15498
28%
46946
19%
15450
59%
15450
37%
26314

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
37%
899
28%
2327
12%
895
47%
895
35%
1433
January16th to endNight
37%
951
31%
2487
13%
951
47%
951
36%
1514
February1st to 15thNight
35%
704
29%
2105
13%
697
47%
697
32%
1213
February16th to endNight
24%
629
30%
1891
9%
629
41%
629
32%
1086
March1st to 15thNight
35%
540
27%
1980
16%
540
49%
540
25%
1153
March16th to endNight
34%
576
25%
2112
15%
576
48%
576
30%
1135
April1st to 15thNight
32%
539
24%
1977
12%
539
51%
539
29%
1075
April16th to endNight
35%
540
26%
1740
14%
540
52%
540
31%
1022
May1st to 15thNight
34%
539
23%
1620
16%
539
45%
539
32%
958
May16th to endNight
52%
562
25%
1684
19%
561
64%
561
36%
970
June1st to 15thNight
69%
540
24%
1620
25%
540
74%
540
51%
799
June16th to endNight
71%
540
24%
1620
27%
540
75%
540
42%
885
July1st to 15thNight
79%
510
24%
1530
27%
510
82%
510
45%
820
July16th to endNight
84%
564
27%
1594
31%
531
87%
531
49%
804
August1st to 15thNight
90%
539
35%
1610
40%
536
90%
536
60%
733
August16th to endNight
76%
573
24%
1959
30%
573
77%
573
35%
1084
September1st to 15thNight
75%
540
21%
1980
26%
540
75%
540
32%
1073
September16th to endNight
75%
504
31%
1857
33%
504
79%
504
37%
956
October1st to 15thNight
69%
536
35%
1856
31%
536
74%
536
43%
913
October16th to endNight
57%
704
36%
2112
22%
704
66%
704
48%
1058
November1st to 15thNight
50%
709
30%
2109
19%
709
57%
709
38%
1185
November16th to endNight
46%
900
31%
2340
16%
900
54%
900
39%
1379
December1st to 15thNight
40%
900
29%
2340
14%
900
48%
900
34%
1471
December16th to endNight
38%
960
25%
2496
11%
960
46%
960
33%
1595

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
11%42442445%6%49%
47855
Night
10%313323347%55%
47149
TransparencyDay
34%49%21%20%9%
47555
Night
29%410%21%21%12%
46954
SeeingDay
10%418%30%27%9%
5480
Night
11%5%26%35%18%1
15501

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 15thDay
15%5%15%31323353%
1611
16th to endDay
13%423213445%54%
1746
February1st to 15thDay
12%6%24323225%54%
1750
16th to endDay
16%6%2331323452%
1582
March1st to 15thDay
20%5%14313245%46%
1980
16th to endDay
14%5%2432333450%
2110
April1st to 15thDay
11%5%25%42335%7%46%
1971
16th to endDay
13%425%424445%47%
2214
May1st to 15thDay
15%6%244245%5%6%41%
2331
16th to endDay
12%6%35%5%35%5%7%8%36%
2430
June1st to 15thDay
5%213435%46%9%52%
2340
16th to endDay
8%324435%5%6%8%44%
2340
July1st to 15thDay
6%3235%35%6%6%9%46%
2340
16th to endDay
6%2235%37%5%6%9%47%
2466
August1st to 15thDay
211232446%8%62%
2340
16th to endDay
8%3146%35%5%7%9%43%
2239
September1st to 15thDay
10%315%4345%6%7%46%
1980
16th to endDay
7%415%33345%7%52%
1848
October1st to 15thDay
10%323322346%56%
1763
16th to endDay
8%3211223467%
1760
November1st to 15thDay
11%324323446%53%
1746
16th to endDay
14%422323225%56%
1620
December1st to 15thDay
16%7%14323335%47%
1620
16th to endDay
15%7%2432235%6%46%
1728
January1st to 15thNight
15%5%23213235%54%
2327
16th to endNight
14%5%13223246%53%
2487
February1st to 15thNight
13%5%2322223456%
2102
16th to endNight
13%423323336%53%
1891
March1st to 15thNight
15%5%24323346%48%
1980
16th to endNight
10%423323337%55%
2112
April1st to 15thNight
7%4145%2435%5%53%
1977
16th to endNight
12%41432335%8%49%
1740
May1st to 15thNight
10%42443345%8%48%
1619
16th to endNight
6%313425%5%6%10%50%
1683
June1st to 15thNight
211232335%9%64%
1620
16th to endNight
4223335%45%10%54%
1620
July1st to 15thNight
4123335%6%9%58%
1620
16th to endNight
221232348%10%57%
1702
August1st to 15thNight
21212448%69%
1620
16th to endNight
6%4145%245%6%9%50%
1959
September1st to 15thNight
8%3134345%5%7%52%
1980
16th to endNight
7%3132235%5%7%56%
1857
October1st to 15thNight
8%312312346%62%
1856
16th to endNight
8%21321223466%
2112
November1st to 15thNight
9%413322335%59%
2109
16th to endNight
13%31331233458%
2340
December1st to 15thNight
15%5%24213346%49%
2340
16th to endNight
14%6%2432334450%
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
36%35%17%24%12%
1612
16th to endDay
33%36%16%25%14%
1746
February1st to 15thDay
34%25%18%23%15%
1751
16th to endDay
36%2419%21%14%
1582
March1st to 15thDay
42%36%16%22%9%
1980
16th to endDay
38%38%17%23%8%
2112
April1st to 15thDay
37%48%19%16%13%
1971
16th to endDay
39%46%17%21%9%
2214
May1st to 15thDay
42%5%8%16%17%8%
2331
16th to endDay
43%6%10%18%17%2
2434
June1st to 15thDay
28%5%12%24%23%5%
2340
16th to endDay
35%7%11%23%17%4
2340
July1st to 15thDay
31%7%15%27%14%2
2201
16th to endDay
28%7%17%28%15%1
2311
August1st to 15thDay
16%5%16%37%21%2
2326
16th to endDay
34%7%16%25%14%3
2239
September1st to 15thDay
34%6%12%23%16%7%
1980
16th to endDay
31%5%9%22%21%10%
1848
October1st to 15thDay
29%49%21%18%16%
1763
16th to endDay
21%2417%33%19%
1760
November1st to 15thDay
33%49%22%20%10%
1746
16th to endDay
33%2415%23%20%
1620
December1st to 15thDay
40%38%18%20%8%
1620
16th to endDay
39%38%18%20%9%
1728
January1st to 15thNight
35%2418%23%16%
2327
16th to endNight
33%2415%24%18%
2487
February1st to 15thNight
34%25%13%24%19%
2112
16th to endNight
33%35%18%21%17%
1891
March1st to 15thNight
38%38%12%23%13%
1980
16th to endNight
31%410%19%24%8%
2112
April1st to 15thNight
32%49%19%18%16%
1977
16th to endNight
35%410%17%20%11%
1740
May1st to 15thNight
33%5%11%20%19%9%
1620
16th to endNight
28%7%15%24%19%3
1685
June1st to 15thNight
18%5%14%30%25%6%
1620
16th to endNight
24%7%13%27%22%4
1620
July1st to 15thNight
21%7%17%32%18%1
1530
16th to endNight
17%8%23%34%15%1
1594
August1st to 15thNight
11%6%16%38%24%3
1610
16th to endNight
29%6%18%29%12%4
1959
September1st to 15thNight
30%6%14%24%15%9%
1980
16th to endNight
26%5%11%24%19%11%
1857
October1st to 15thNight
24%310%24%19%18%
1856
16th to endNight
22%25%17%26%24%
2112
November1st to 15thNight
30%37%21%23%13%
2109
16th to endNight
31%26%13%25%20%
2340
December1st to 15thNight
36%38%19%19%12%
2340
16th to endNight
38%27%16%23%12%
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
20%8%35%25%7%2
90
16th to endDay
11%14%45%19%7%1
96
February1st to 15thDay
11%10%32%40%6%
90
16th to endDay
11%13%45%23%6%
81
March1st to 15thDay
30%8%32%21%6%1
90
16th to endDay
13%441%27%11%2
96
April1st to 15thDay
13%11%40%24%11%
90
16th to endDay
14%9%39%24%10%1
324
May1st to 15thDay
16%8%35%26%11%1
468
16th to endDay
15%5%31%27%17%3
517
June1st to 15thDay
7%13%41%27%9%
495
16th to endDay
8%111%37%31%9%
495
July1st to 15thDay
418%38%36%11%
475
16th to endDay
3330%43%17%
515
August1st to 15thDay
4229%45%17%
493
16th to endDay
12%1429%35%16%
279
September1st to 15thDay
220%50%27%
135
16th to endDay
3218%49%27%
99
October1st to 15thDay
7%32%48%11%
90
16th to endDay
17%313%25%35%5%
96
November1st to 15thDay
27%5%22%21%17%5%
90
16th to endDay
25%11%25%21%13%3
90
December1st to 15thDay
21%5%25%24%15%7%
90
16th to endDay
17%12%39%20%8%1
96
January1st to 15thNight
19%9%30%30%10%
900
16th to endNight
16%8%34%32%7%
951
February1st to 15thNight
17%11%32%32%6%
704
16th to endNight
15%11%47%21%4
629
March1st to 15thNight
18%9%33%32%6%
540
16th to endNight
11%10%40%31%5%
576
April1st to 15thNight
8%10%44%32%3
539
16th to endNight
14%7%40%27%10%
540
May1st to 15thNight
10%8%40%31%7%
540
16th to endNight
8%331%37%17%2
563
June1st to 15thNight
221%48%25%1
540
16th to endNight
315%49%26%3
540
July1st to 15thNight
49%49%32%3
510
16th to endNight
25%44%42%4
564
August1st to 15thNight
3241%44%7%
539
16th to endNight
8%5%36%44%5%
573
September1st to 15thNight
7%6%36%42%5%
540
16th to endNight
7%19%35%39%5%
504
October1st to 15thNight
8%115%44%24%5%
536
16th to endNight
10%5%24%32%25%2
704
November1st to 15thNight
11%429%33%19%
709
16th to endNight
16%6%27%34%14%1
900
December1st to 15thNight
17%7%31%33%10%
900
16th to endNight
18%7%31%33%8%
960
Page generated at 2017-09-20 03:49:56. Version ac04

Copyright 2017 A. Danko


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