Lake Whitney State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Whitney State Park clear sky chart from 2005-11-06 to 2024-01-31.

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
49%
24002
28%
74474
19%
23947
58%
23947
36%
41082

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
37%
947
31%
2458
13%
946
48%
946
39%
1457
January11th to 20thNight
34%
950
28%
2470
10%
950
45%
950
35%
1493
January21st to endNight
34%
1043
30%
2711
12%
1043
44%
1043
34%
1673
February1st to 10thNight
30%
734
27%
2174
10%
734
42%
734
29%
1325
February11th to 20thNight
26%
704
24%
2098
10%
700
38%
700
29%
1267
February21st to endNight
20%
588
29%
1772
8%
588
38%
588
29%
1055
March1st to 10thNight
30%
540
25%
1980
13%
540
44%
540
24%
1168
March11th to 20thNight
33%
540
24%
1980
14%
540
45%
540
26%
1125
March21st to endNight
31%
594
27%
2178
14%
594
49%
594
30%
1158
April1st to 10thNight
31%
540
27%
1980
13%
540
51%
540
31%
1049
April11th to 20thNight
31%
533
24%
1909
14%
533
46%
533
27%
1072
April21st to endNight
31%
540
29%
1645
14%
540
51%
540
34%
941
May1st to 10thNight
35%
540
27%
1620
18%
540
50%
540
35%
932
May11th to 20thNight
43%
531
21%
1594
16%
531
52%
531
33%
941
May21st to endNight
50%
583
23%
1745
18%
582
62%
582
35%
1010
June1st to 10thNight
68%
540
24%
1620
24%
540
74%
540
46%
840
June11th to 20thNight
65%
540
27%
1620
28%
540
71%
540
52%
797
June21st to endNight
72%
540
24%
1620
27%
540
75%
540
43%
867
July1st to 10thNight
75%
525
22%
1575
25%
525
78%
525
42%
858
July11th to 20thNight
86%
522
33%
1566
38%
522
89%
522
64%
693
July21st to endNight
86%
591
29%
1673
33%
558
89%
558
54%
808
August1st to 10thNight
91%
537
36%
1601
42%
534
93%
534
71%
667
August11th to 20thNight
79%
534
31%
1612
36%
534
79%
534
43%
863
August21st to endNight
82%
594
26%
2092
31%
594
84%
594
42%
1015
September1st to 10thNight
74%
540
24%
1980
29%
540
76%
540
38%
998
September11th to 20thNight
70%
540
24%
1980
26%
540
72%
540
32%
1078
September21st to endNight
73%
540
34%
1980
34%
540
77%
540
44%
916
October1st to 10thNight
73%
540
36%
1980
36%
540
78%
540
47%
884
October11th to 20thNight
54%
709
34%
2149
20%
709
64%
709
41%
1157
October21st to endNight
46%
792
34%
2376
20%
792
56%
792
39%
1300
November1st to 10thNight
53%
740
32%
2220
19%
740
61%
740
41%
1213
November11th to 20thNight
49%
884
29%
2404
16%
884
58%
884
41%
1379
November21st to endNight
37%
950
29%
2470
13%
950
46%
950
33%
1545
December1st to 10thNight
42%
950
33%
2470
15%
950
52%
950
39%
1459
December11th to 20thNight
36%
948
29%
2863
13%
948
44%
948
28%
1766
December21st to endNight
36%
1039
18%
4309
11%
1026
46%
1026
24%
2313

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
10%5%2443445%7%52%
75078
Night
10%42432345%7%56%
75077
TransparencyDay
32%6%10%22%21%9%
74803
Night
29%5%10%22%23%12%
74872
SeeingDay
12%6%21%29%24%8%
13962
Night
13%7%27%36%16%2
24014

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 10thDay
13%5%24323345%57%
1707
11th to 20thDay
15%5%23323345%54%
1710
21st to endDay
15%6%24223445%54%
1872
February1st to 10thDay
16%7%26%324345%49%
1800
11th to 20thDay
17%8%36%323335%47%
1749
21st to endDay
19%5%25%322245%51%
1482
March1st to 10thDay
17%6%25%5%23446%46%
1980
11th to 20thDay
14%7%25%5%34446%46%
1980
21st to endDay
12%5%245%33346%51%
2178
April1st to 10thDay
12%6%345%2446%7%47%
1980
11th to 20thDay
12%6%35%5%345%5%7%46%
1999
21st to endDay
11%5%25%434447%50%
2311
May1st to 10thDay
12%5%25%445%5%5%8%46%
2340
11th to 20thDay
12%6%35%5%35%46%7%44%
2302
21st to endDay
11%6%35%6%45%5%8%10%38%
2531
June1st to 10thDay
5%223445%5%6%8%55%
2340
11th to 20thDay
44144345%6%9%55%
2340
21st to endDay
5%3245%36%5%7%7%53%
2340
July1st to 10thDay
7%425%6%45%6%7%9%45%
2340
11th to 20thDay
32123345%6%8%62%
2340
21st to endDay
4323335%5%6%11%54%
2546
August1st to 10thDay
111223446%10%66%
2328
11th to 20thDay
7%4244345%6%10%52%
2284
21st to endDay
5%214435%6%6%10%53%
2261
September1st to 10thDay
8%425%6%35%5%5%6%52%
1980
11th to 20thDay
9%5%35%5%346%6%7%48%
1980
21st to endDay
6%41443345%8%58%
1980
October1st to 10thDay
5%31432345%7%61%
1972
11th to 20thDay
11%41433344460%
1800
21st to endDay
13%414313235%61%
1980
November1st to 10thDay
13%5%24422346%55%
1858
11th to 20thDay
7%41443445%7%58%
1772
21st to endDay
16%5%26%323335%51%
1710
December1st to 10thDay
15%42443345%5%52%
1710
11th to 20thDay
15%6%35%5%24446%47%
2161
21st to endDay
16%6%2432333452%
3135
January1st to 10thNight
13%5%23323336%58%
2458
11th to 20thNight
15%423323345%57%
2470
21st to endNight
14%6%24323345%53%
2711
February1st to 10thNight
14%6%45%422335%52%
2174
11th to 20thNight
17%5%24423345%51%
2098
21st to endNight
19%5%23312335%53%
1772
March1st to 10thNight
15%6%35%43435%8%45%
1980
11th to 20thNight
13%5%24324447%50%
1980
21st to endNight
10%5%2432445%7%56%
2178
April1st to 10thNight
9%4234235%5%8%54%
1980
11th to 20thNight
12%5%24335%446%52%
1909
21st to endNight
10%4243245%6%6%54%
1645
May1st to 10thNight
10%42442445%9%52%
1620
11th to 20thNight
10%6%26%42437%9%48%
1593
21st to endNight
10%3234245%7%10%50%
1745
June1st to 10thNight
331433445%10%60%
1620
11th to 20thNight
331331435%9%64%
1620
21st to endNight
4313435%5%6%8%59%
1620
July1st to 10thNight
5%3234345%7%12%52%
1620
11th to 20thNight
31122336%9%70%
1620
21st to endNight
11134245%6%11%61%
1772
August1st to 10thNight
2111112249%76%
1611
11th to 20thNight
5%4244245%6%10%55%
1612
21st to endNight
4213435%46%9%58%
2092
September1st to 10thNight
7%5%2343336%9%55%
1980
11th to 20thNight
11%42432445%8%52%
1980
21st to endNight
6%213323447%63%
1980
October1st to 10thNight
5%3132235%46%66%
1980
11th to 20thNight
12%313323345%62%
2149
21st to endNight
14%42322224461%
2376
November1st to 10thNight
10%413323335%61%
2220
11th to 20thNight
6%5%245%24446%58%
2404
21st to endNight
16%5%24324335%52%
2470
December1st to 10thNight
12%5%24323347%55%
2470
11th to 20thNight
12%7%34433446%50%
3036
21st to endNight
16%7%23322335%55%
4532

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
31%36%20%28%11%
1708
11th to 20thDay
34%46%22%24%11%
1710
21st to endDay
35%35%18%26%13%
1872
February1st to 10thDay
40%5%5%15%22%14%
1800
11th to 20thDay
41%47%17%21%10%
1759
21st to endDay
39%35%15%21%17%
1482
March1st to 10thDay
41%47%15%23%11%
1980
11th to 20thDay
41%5%7%13%23%10%
1980
21st to endDay
36%49%20%21%10%
2178
April1st to 10thDay
37%6%10%19%18%11%
1980
11th to 20thDay
39%6%8%16%21%10%
1999
21st to endDay
35%6%8%19%25%8%
2311
May1st to 10thDay
37%5%10%22%19%7%
2340
11th to 20thDay
38%7%12%20%19%3
2306
21st to endDay
41%9%12%21%15%2
2531
June1st to 10thDay
26%7%14%30%19%4
2340
11th to 20thDay
26%7%13%29%18%7%
2340
21st to endDay
27%8%14%24%23%5%
2340
July1st to 10thDay
33%9%18%26%13%2
2276
11th to 20thDay
19%7%16%31%22%5%
2271
21st to endDay
21%8%20%32%18%1
2405
August1st to 10thDay
13%6%16%36%25%3
2314
11th to 20thDay
27%7%17%29%17%4
2284
21st to endDay
24%8%16%28%20%4
2261
September1st to 10thDay
32%6%10%21%22%9%
1980
11th to 20thDay
33%9%13%20%18%8%
1980
21st to endDay
25%5%9%23%25%13%
1980
October1st to 10thDay
22%5%12%23%21%17%
1972
11th to 20thDay
28%47%15%27%19%
1800
21st to endDay
29%36%17%26%19%
1980
November1st to 10thDay
32%48%22%22%11%
1858
11th to 20thDay
26%410%20%26%13%
1772
21st to endDay
38%4420%22%12%
1710
December1st to 10thDay
34%49%23%21%8%
1710
11th to 20thDay
40%47%14%24%11%
2159
21st to endDay
35%46%18%25%12%
3135
January1st to 10thNight
30%45%19%27%15%
2458
11th to 20thNight
33%36%19%26%13%
2470
21st to endNight
34%45%16%24%17%
2711
February1st to 10thNight
38%37%13%22%17%
2174
11th to 20thNight
37%37%16%25%12%
2098
21st to endNight
37%36%15%20%19%
1772
March1st to 10thNight
38%5%9%13%21%13%
1980
11th to 20thNight
35%5%10%14%24%11%
1980
21st to endNight
30%5%11%20%24%9%
2178
April1st to 10thNight
29%5%10%21%20%14%
1980
11th to 20thNight
34%6%10%17%19%15%
1909
21st to endNight
30%6%10%20%27%7%
1645
May1st to 10thNight
30%6%12%22%19%10%
1620
11th to 20thNight
33%6%15%24%18%4
1594
21st to endNight
30%7%16%27%18%2
1746
June1st to 10thNight
20%7%15%31%21%5%
1620
11th to 20thNight
18%5%15%32%22%7%
1620
21st to endNight
21%9%13%27%24%6%
1620
July1st to 10thNight
23%8%19%33%14%2
1575
11th to 20thNight
11%416%38%25%5%
1566
21st to endNight
14%8%21%37%19%1
1673
August1st to 10thNight
8%417%39%27%5%
1601
11th to 20thNight
24%6%15%28%21%5%
1612
21st to endNight
20%8%17%33%18%4
2092
September1st to 10thNight
26%5%14%24%20%11%
1980
11th to 20thNight
30%7%13%20%21%9%
1980
21st to endNight
21%410%25%23%17%
1980
October1st to 10thNight
18%5%11%27%20%19%
1980
11th to 20thNight
27%48%16%23%23%
2149
21st to endNight
29%3417%25%22%
2376
November1st to 10thNight
28%47%20%27%15%
2220
11th to 20thNight
28%48%19%25%16%
2404
21st to endNight
37%36%16%25%13%
2470
December1st to 10thNight
30%49%23%22%12%
2470
11th to 20thNight
37%46%13%26%14%
3037
21st to endNight
34%35%16%26%16%
4532

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
18%12%36%26%8%
270
11th to 20thDay
20%14%33%25%7%2
270
21st to endDay
20%13%35%23%8%1
294
February1st to 10thDay
23%15%32%26%4
240
11th to 20thDay
25%15%39%17%4
240
21st to endDay
30%13%36%19%3
198
March1st to 10thDay
22%14%38%22%31
240
11th to 20thDay
20%17%35%20%6%2
240
21st to endDay
14%13%45%22%5%1
264
April1st to 10thDay
18%14%40%20%8%
240
11th to 20thDay
17%14%34%25%10%
277
21st to endDay
16%14%36%23%9%1
571
May1st to 10thDay
13%11%37%31%8%1
603
11th to 20thDay
15%5%29%32%14%4
625
21st to endDay
13%428%32%19%5%
679
June1st to 10thDay
6%215%40%27%10%
630
11th to 20thDay
5%119%43%26%6%
630
21st to endDay
4311%37%34%11%
630
July1st to 10thDay
7%27%31%41%13%
621
11th to 20thDay
11331%49%15%
618
21st to endDay
41428%45%18%
684
August1st to 10thDay
216%31%44%17%
626
11th to 20thDay
8%2430%42%15%
598
21st to endDay
5%2324%36%29%
380
September1st to 10thDay
6%15%18%39%31%
270
11th to 20thDay
6%15%20%42%27%
270
21st to endDay
11%2427%37%18%
270
October1st to 10thDay
3314%31%38%11%
270
11th to 20thDay
9%6%27%31%21%6%
270
21st to endDay
21%11%22%24%19%3
297
November1st to 10thDay
19%333%26%16%4
270
11th to 20thDay
10%10%26%32%19%3
270
21st to endDay
22%12%32%22%10%2
270
December1st to 10thDay
15%6%35%29%11%4
270
11th to 20thDay
19%14%31%24%10%1
270
21st to endDay
21%8%34%26%9%1
297
January1st to 10thNight
16%8%34%33%8%
950
11th to 20thNight
19%12%32%32%6%
950
21st to endNight
18%11%33%31%7%
1043
February1st to 10thNight
19%13%35%28%4
734
11th to 20thNight
20%12%39%26%3
704
21st to endNight
25%11%41%20%2
588
March1st to 10thNight
19%11%38%27%6%
540
11th to 20thNight
16%9%39%31%5%
540
21st to endNight
12%12%42%29%5%
594
April1st to 10thNight
11%9%46%29%5%
540
11th to 20thNight
14%11%40%30%5%
533
21st to endNight
11%11%45%25%8%1
540
May1st to 10thNight
10%10%41%32%6%1
540
11th to 20thNight
11%7%35%31%14%2
531
21st to endNight
10%431%40%14%2
584
June1st to 10thNight
4219%49%24%3
540
11th to 20thNight
4125%51%18%1
540
21st to endNight
4116%49%26%5%
540
July1st to 10thNight
6%29%44%35%4
525
11th to 20thNight
316%52%35%3
522
21st to endNight
115%50%40%3
591
August1st to 10thNight
11451%39%4
537
11th to 20thNight
7%15%46%36%6%
534
21st to endNight
415%37%45%8%
594
September1st to 10thNight
9%17%41%38%4
540
11th to 20thNight
11%27%39%38%3
540
21st to endNight
7%112%40%36%4
540
October1st to 10thNight
6%215%47%26%4
540
11th to 20thNight
13%424%39%17%2
709
21st to endNight
16%7%28%32%15%2
792
November1st to 10thNight
12%428%39%17%1
740
11th to 20thNight
8%9%29%38%13%1
884
21st to endNight
18%10%32%28%11%1
950
December1st to 10thNight
15%8%32%35%9%
950
11th to 20thNight
18%8%31%35%6%
950
21st to endNight
20%8%33%32%7%
1045
Page generated at 2024-01-28 04:26:32. Version ac07

Copyright 2024 Attilla Danko


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