Loblolly Ranch
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Loblolly Ranch clear sky chart from 2005-11-05 to 2017-12-02.

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
54%
15623
23%
47848
18%
15577
59%
15577
31%
28780

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
39%
898
22%
2327
11%
895
45%
895
29%
1542
January16th to endNight
38%
917
24%
2453
11%
917
46%
917
30%
1588
February1st to 15thNight
38%
704
25%
2110
13%
699
48%
699
25%
1340
February16th to endNight
30%
590
24%
1852
10%
590
42%
590
24%
1152
March1st to 15thNight
36%
540
25%
1980
14%
540
49%
540
21%
1231
March16th to endNight
41%
576
22%
2112
18%
576
49%
576
26%
1214
April1st to 15thNight
34%
539
19%
1977
12%
539
45%
539
24%
1188
April16th to endNight
34%
540
20%
1840
16%
540
43%
540
22%
1169
May1st to 15thNight
40%
539
19%
1620
13%
539
48%
539
26%
1049
May16th to endNight
55%
563
22%
1685
21%
561
59%
561
30%
1037
June1st to 15thNight
75%
540
18%
1620
22%
540
76%
540
40%
899
June16th to endNight
72%
540
16%
1620
19%
540
74%
540
31%
987
July1st to 15thNight
80%
510
17%
1530
20%
510
80%
510
37%
880
July16th to endNight
84%
564
20%
1594
22%
531
86%
531
40%
890
August1st to 15thNight
90%
539
26%
1611
28%
536
90%
536
53%
776
August16th to endNight
80%
573
17%
2035
22%
573
81%
573
31%
1165
September1st to 15thNight
78%
540
18%
1980
22%
540
79%
540
30%
1129
September16th to endNight
72%
537
24%
1980
27%
537
73%
537
29%
1123
October1st to 15thNight
74%
585
32%
2025
31%
585
76%
585
41%
1007
October16th to endNight
65%
768
36%
2304
28%
768
69%
768
47%
1176
November1st to 15thNight
57%
760
25%
2280
19%
760
59%
760
31%
1384
November16th to endNight
53%
891
32%
2451
19%
891
59%
891
38%
1433
December1st to 15thNight
40%
910
24%
2366
13%
910
44%
910
26%
1646
December16th to endNight
36%
960
19%
2496
9%
960
41%
960
23%
1775

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%5%35%5%35%5%6%8%39%
48589
Night
11%42442445%7%48%
48045
TransparencyDay
41%7%11%17%14%7%
48289
Night
34%6%13%20%15%9%
47850
SeeingDay
12%318%29%25%11%
5524
Night
13%421%34%23%2
15626

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
21%5%245%23445%39%
1611
16th to endDay
17%6%33324246%44%
1781
February1st to 15thDay
19%6%23223445%45%
1750
16th to endDay
16%8%345%2235%5%43%
1619
March1st to 15thDay
21%6%35%423446%38%
1980
16th to endDay
13%6%35%5%23347%43%
2110
April1st to 15thDay
12%7%35%5%3435%7%40%
1971
16th to endDay
15%7%26%5%24447%39%
2114
May1st to 15thDay
10%6%46%6%35%5%6%8%35%
2331
16th to endDay
8%5%26%6%5%6%6%8%10%33%
2430
June1st to 15thDay
3325%7%5%8%8%8%9%38%
2340
16th to endDay
6%6%47%7%5%9%7%7%10%27%
2340
July1st to 15thDay
9%5%36%6%47%7%7%10%32%
2340
16th to endDay
5%435%7%48%7%9%10%32%
2466
August1st to 15thDay
22146%37%7%7%11%45%
2334
16th to endDay
8%426%8%5%7%6%8%9%30%
2166
September1st to 15thDay
9%6%46%8%47%5%7%8%31%
1980
16th to endDay
9%5%36%6%36%6%6%9%36%
1980
October1st to 15thDay
7%3245%36%45%8%48%
1923
16th to endDay
8%323423446%56%
1920
November1st to 15thDay
10%6%26%6%36%5%5%7%38%
1908
16th to endDay
12%424423346%50%
1836
December1st to 15thDay
22%8%46%423446%33%
1631
16th to endDay
17%8%35%5%33445%38%
1728
January1st to 15thNight
20%5%23322336%44%
2327
16th to endNight
17%5%24323345%46%
2453
February1st to 15thNight
16%6%34323245%45%
2102
16th to endNight
15%5%3442333447%
1852
March1st to 15thNight
17%6%25%423345%43%
1980
16th to endNight
13%5%23324347%47%
2112
April1st to 15thNight
12%6%245%25%46%7%42%
1977
16th to endNight
16%7%35%42345%7%40%
1840
May1st to 15thNight
10%5%25%6%25%5%5%8%41%
1619
16th to endNight
6%6%24435%5%7%10%42%
1683
June1st to 15thNight
431342446%10%54%
1620
16th to endNight
6%2145%45%5%7%11%43%
1620
July1st to 15thNight
43244335%8%11%49%
1620
16th to endNight
223435%47%12%53%
1702
August1st to 15thNight
11221346%10%63%
1621
16th to endNight
5%313436%5%6%13%47%
2035
September1st to 15thNight
5%415%4345%5%8%51%
1980
16th to endNight
7%415%5%3445%9%47%
1980
October1st to 15thNight
5%214323346%60%
2025
16th to endNight
6%31332223466%
2304
November1st to 15thNight
11%42442445%6%49%
2280
16th to endNight
11%413324235%57%
2451
December1st to 15thNight
19%6%34324446%40%
2366
16th to endNight
18%7%35%6%2444438%
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
48%45%12%16%11%
1612
16th to endDay
42%45%15%19%13%
1781
February1st to 15thDay
42%46%14%17%15%
1751
16th to endDay
44%37%14%18%11%
1619
March1st to 15thDay
48%47%11%18%9%
1980
16th to endDay
40%5%9%15%18%10%
2112
April1st to 15thDay
41%6%8%15%17%10%
1971
16th to endDay
44%5%8%17%13%9%
2114
May1st to 15thDay
44%6%11%15%13%7%
2331
16th to endDay
40%9%13%18%14%3
2434
June1st to 15thDay
34%10%13%20%16%3
2340
16th to endDay
46%10%13%20%8%
2340
July1st to 15thDay
42%10%14%21%9%
2201
16th to endDay
38%13%20%24%3
2311
August1st to 15thDay
30%9%20%29%9%
2320
16th to endDay
44%12%16%18%6%2
2166
September1st to 15thDay
45%12%11%15%11%3
1980
16th to endDay
41%8%12%16%13%6%
1980
October1st to 15thDay
32%6%10%21%16%12%
1923
16th to endDay
30%46%14%23%19%
1920
November1st to 15thDay
43%7%11%11%15%9%
1908
16th to endDay
36%38%15%18%17%
1836
December1st to 15thDay
53%35%13%15%8%
1631
16th to endDay
49%47%14%15%9%
1728
January1st to 15thNight
41%37%14%18%13%
2327
16th to endNight
40%37%16%18%14%
2453
February1st to 15thNight
41%47%12%17%16%
2112
16th to endNight
40%5%5%16%19%12%
1852
March1st to 15thNight
42%5%8%14%17%10%
1980
16th to endNight
37%412%15%18%12%
2112
April1st to 15thNight
39%5%12%16%15%11%
1977
16th to endNight
44%411%16%12%10%
1840
May1st to 15thNight
39%7%13%16%12%9%
1620
16th to endNight
34%7%16%23%14%2
1685
June1st to 15thNight
25%7%16%27%21%2
1620
16th to endNight
31%10%20%28%9%
1620
July1st to 15thNight
25%10%25%31%6%
1530
16th to endNight
22%10%31%30%4
1594
August1st to 15thNight
14%8%28%41%6%
1611
16th to endNight
27%11%28%25%5%1
2035
September1st to 15thNight
30%9%21%23%12%3
1980
16th to endNight
31%8%15%23%15%5%
1980
October1st to 15thNight
24%413%27%18%11%
2025
16th to endNight
22%36%18%27%21%
2304
November1st to 15thNight
34%6%13%19%16%9%
2280
16th to endNight
31%39%17%20%18%
2451
December1st to 15thNight
45%5%7%18%14%8%
2366
16th to endNight
47%5%6%12%16%10%
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
17%434%35%6%1
90
16th to endDay
21%10%34%18%13%1
96
February1st to 15thDay
12%12%35%25%13%1
90
16th to endDay
18%8%34%28%9%
81
March1st to 15thDay
37%5%30%17%8%
90
16th to endDay
13%11%30%28%16%
96
April1st to 15thDay
17%11%27%32%11%
90
16th to endDay
20%7%29%28%12%1
224
May1st to 15thDay
12%8%43%24%9%
468
16th to endDay
14%332%29%17%2
517
June1st to 15thDay
7%12%38%31%9%
495
16th to endDay
9%111%33%29%14%
495
July1st to 15thDay
6%17%34%34%15%
475
16th to endDay
5%330%36%22%
515
August1st to 15thDay
3328%38%25%
487
16th to endDay
16%2433%21%20%
206
September1st to 15thDay
11%6%22%38%20%
135
16th to endDay
7%417%49%20%
135
October1st to 15thDay
2231%42%20%
135
16th to endDay
13%315%30%27%8%
144
November1st to 15thDay
20%220%29%22%2
135
16th to endDay
17%6%22%28%14%10%
135
December1st to 15thDay
34%20%21%10%13%
94
16th to endDay
37%9%34%11%6%1
96
January1st to 15thNight
22%7%25%32%11%
900
16th to endNight
19%7%29%35%7%
917
February1st to 15thNight
20%9%27%35%7%
704
16th to endNight
19%10%35%29%5%
590
March1st to 15thNight
20%7%32%31%7%
540
16th to endNight
15%7%32%36%7%
576
April1st to 15thNight
17%5%36%31%8%
539
16th to endNight
21%6%35%28%8%
540
May1st to 15thNight
11%5%38%35%8%
540
16th to endNight
9%227%41%18%1
563
June1st to 15thNight
6%9%52%28%1
540
16th to endNight
6%19%42%35%5%
540
July1st to 15thNight
3337%49%5%
510
16th to endNight
1433%50%9%
564
August1st to 15thNight
2233%53%7%
539
16th to endNight
7%228%51%9%
573
September1st to 15thNight
7%224%54%9%
540
16th to endNight
9%7%28%47%6%
537
October1st to 15thNight
6%111%36%40%3
585
16th to endNight
8%418%40%25%2
768
November1st to 15thNight
13%420%39%21%2
760
16th to endNight
13%5%24%33%20%1
891
December1st to 15thNight
23%6%25%28%15%1
910
16th to endNight
22%8%25%30%12%
960
Page generated at 2017-12-03 10:16:38. Version ac04

Copyright 2017 A. Danko


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