Lawton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lawton clear sky chart from 2005-11-06 to 2024-01-13.

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%
24164
30%
74276
19%
24106
59%
24106
40%
39297

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
40%
950
33%
2458
13%
946
53%
946
45%
1369
January11th to 20thNight
42%
911
31%
2367
14%
911
52%
911
44%
1323
January21st to endNight
41%
990
37%
2574
15%
990
54%
990
46%
1440
February1st to 10thNight
34%
747
29%
2187
12%
747
47%
747
35%
1266
February11th to 20thNight
32%
703
27%
2098
11%
700
44%
700
35%
1162
February21st to endNight
28%
592
33%
1776
11%
592
45%
592
32%
1000
March1st to 10thNight
33%
622
29%
2062
14%
622
47%
622
30%
1143
March11th to 20thNight
35%
540
28%
1980
17%
540
50%
540
31%
1028
March21st to endNight
31%
594
26%
2178
14%
594
48%
594
31%
1110
April1st to 10thNight
26%
540
27%
1980
13%
540
48%
540
34%
966
April11th to 20thNight
27%
533
26%
1780
13%
533
45%
533
34%
958
April21st to endNight
32%
540
31%
1620
15%
540
52%
540
37%
907
May1st to 10thNight
33%
540
28%
1620
16%
540
51%
540
36%
925
May11th to 20thNight
42%
531
21%
1594
18%
531
51%
531
37%
912
May21st to endNight
49%
582
25%
1745
19%
582
61%
582
39%
963
June1st to 10thNight
67%
540
25%
1620
21%
540
75%
540
50%
808
June11th to 20thNight
58%
540
24%
1620
20%
540
65%
540
47%
821
June21st to endNight
68%
540
30%
1620
28%
540
74%
540
53%
781
July1st to 10thNight
77%
525
21%
1575
23%
525
78%
525
42%
865
July11th to 20thNight
83%
522
30%
1566
33%
522
85%
522
56%
728
July21st to endNight
84%
591
33%
1673
39%
558
86%
558
56%
787
August1st to 10thNight
79%
537
34%
1601
38%
534
82%
534
54%
762
August11th to 20thNight
73%
534
30%
1626
34%
534
75%
534
41%
879
August21st to endNight
84%
594
30%
1996
35%
594
85%
594
51%
910
September1st to 10thNight
71%
540
27%
1980
32%
540
75%
540
40%
969
September11th to 20thNight
59%
540
27%
1980
27%
540
66%
540
30%
1106
September21st to endNight
66%
540
37%
1980
34%
540
73%
540
42%
926
October1st to 10thNight
57%
540
36%
1980
31%
540
67%
540
41%
925
October11th to 20thNight
49%
678
37%
2118
20%
678
62%
678
45%
1062
October21st to endNight
45%
792
35%
2376
18%
792
56%
792
42%
1230
November1st to 10thNight
47%
857
33%
2337
14%
857
58%
857
50%
1216
November11th to 20thNight
46%
950
34%
2470
14%
950
57%
950
52%
1308
November21st to endNight
42%
950
33%
2470
14%
950
53%
950
42%
1417
December1st to 10thNight
43%
950
35%
2470
15%
950
56%
950
46%
1371
December11th to 20thNight
35%
949
33%
2861
14%
948
47%
948
33%
1672
December21st to endNight
35%
1040
21%
4338
12%
1026
48%
1026
27%
2282

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
9%42442445%7%55%
74903
Night
8%42332345%7%59%
74852
TransparencyDay
29%410%25%24%8%
74628
Night
26%49%24%27%11%
74647
SeeingDay
10%7%24%30%22%6%
14147
Night
10%7%31%37%14%1
24173

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
7%42332445%7%59%
1707
11th to 20thDay
10%6%24323345%57%
1638
21st to endDay
8%5%2433345%6%58%
1782
February1st to 10thDay
10%7%3442343456%
1786
11th to 20thDay
11%5%24424446%54%
1749
21st to endDay
14%7%3442333454%
1480
March1st to 10thDay
14%5%24433447%50%
1896
11th to 20thDay
15%6%24323336%52%
1980
21st to endDay
11%5%35%5%2435%7%50%
2178
April1st to 10thDay
9%424324446%58%
1980
11th to 20thDay
14%5%24434346%51%
2126
21st to endDay
12%42433445%6%53%
2340
May1st to 10thDay
11%6%35%43435%6%51%
2340
11th to 20thDay
12%5%25%424447%50%
2302
21st to endDay
11%5%26%5%35%5%6%8%44%
2531
June1st to 10thDay
6%5%23435%5%7%9%52%
2340
11th to 20thDay
5%324435%47%8%56%
2340
21st to endDay
6%32322445%7%63%
2340
July1st to 10thDay
6%425%5%46%6%7%10%47%
2340
11th to 20thDay
421333346%9%62%
2340
21st to endDay
3223435%5%6%10%57%
2546
August1st to 10thDay
42135%3446%9%58%
2328
11th to 20thDay
6%4244346%8%8%50%
2270
21st to endDay
4214435%5%6%9%59%
2358
September1st to 10thDay
8%314334446%59%
1980
11th to 20thDay
10%5%35%5%345%5%5%49%
1980
21st to endDay
9%31333445%6%59%
1980
October1st to 10thDay
7%324423447%61%
1980
11th to 20thDay
10%31332223467%
1823
21st to endDay
12%42432333462%
1980
November1st to 10thDay
9%413313446%62%
1737
11th to 20thDay
6%322313346%68%
1710
21st to endDay
13%413313436%60%
1710
December1st to 10thDay
8%4245%24437%58%
1710
11th to 20thDay
12%6%24434345%52%
2161
21st to endDay
13%7%245%3445%6%47%
3135
January1st to 10thNight
7%42332345%7%60%
2458
11th to 20thNight
8%5%23323336%62%
2367
21st to endNight
8%323323345%62%
2574
February1st to 10thNight
12%5%24423335%56%
2187
11th to 20thNight
10%6%24423338%55%
2098
21st to endNight
11%5%24423346%55%
1776
March1st to 10thNight
9%425%4335%47%54%
2062
11th to 20thNight
15%423223346%57%
1980
21st to endNight
9%5%2442435%7%56%
2178
April1st to 10thNight
8%42432345%7%59%
1980
11th to 20thNight
12%424323446%55%
1780
21st to endNight
13%42332335%8%55%
1620
May1st to 10thNight
10%424433446%55%
1620
11th to 20thNight
10%5%2442446%10%51%
1593
21st to endNight
7%3234345%6%10%53%
1745
June1st to 10thNight
321242347%11%60%
1620
11th to 20thNight
5%2134245%7%9%59%
1620
21st to endNight
4213323448%66%
1620
July1st to 10thNight
4313435%6%7%12%52%
1620
11th to 20thNight
2112325%45%10%64%
1620
21st to endNight
221332446%10%63%
1772
August1st to 10thNight
21134245%6%11%60%
1611
11th to 20thNight
6%3135%35%5%8%10%51%
1626
21st to endNight
31133245%6%10%61%
1996
September1st to 10thNight
8%31333346%6%60%
1980
11th to 20thNight
9%5%35%5%335%5%6%51%
1980
21st to endNight
7%314422446%62%
1980
October1st to 10thNight
7%3243235%47%62%
1980
11th to 20thNight
9%41332323466%
2118
21st to endNight
11%413222335%65%
2376
November1st to 10thNight
7%423222235%67%
2337
11th to 20thNight
5%313323436%67%
2470
21st to endNight
11%423322345%60%
2470
December1st to 10thNight
9%413323346%62%
2470
11th to 20thNight
10%6%25%433346%55%
3036
21st to endNight
13%5%23423346%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
25%410%26%28%8%
1708
11th to 20thDay
30%25%20%35%7%
1638
21st to endDay
28%37%26%28%9%
1782
February1st to 10thDay
32%38%25%27%6%
1786
11th to 20thDay
33%36%28%21%9%
1759
21st to endDay
37%3316%28%13%
1480
March1st to 10thDay
34%47%20%21%14%
1896
11th to 20thDay
36%48%23%22%8%
1980
21st to endDay
35%49%24%21%7%
2178
April1st to 10thDay
28%410%26%22%11%
1980
11th to 20thDay
34%49%20%22%11%
2126
21st to endDay
32%410%25%24%5%
2340
May1st to 10thDay
34%5%10%21%21%9%
2340
11th to 20thDay
34%5%12%26%20%3
2306
21st to endDay
36%7%15%23%17%3
2531
June1st to 10thDay
26%7%17%28%17%5%
2340
11th to 20thDay
24%6%13%26%24%7%
2340
21st to endDay
21%6%12%28%26%8%
2340
July1st to 10thDay
32%7%15%28%16%3
2276
11th to 20thDay
19%5%10%32%28%6%
2271
21st to endDay
21%6%14%33%26%2
2405
August1st to 10thDay
21%5%12%31%24%7%
2314
11th to 20thDay
27%7%13%28%20%5%
2270
21st to endDay
21%5%13%30%24%7%
2358
September1st to 10thDay
26%48%24%25%13%
1980
11th to 20thDay
37%5%10%19%22%7%
1980
21st to endDay
26%47%24%30%9%
1980
October1st to 10thDay
25%411%23%27%11%
1980
11th to 20thDay
24%26%19%34%16%
1823
21st to endDay
28%37%23%26%13%
1980
November1st to 10thDay
24%37%24%29%12%
1737
11th to 20thDay
19%27%29%31%11%
1710
21st to endDay
28%35%24%28%12%
1710
December1st to 10thDay
29%410%28%24%6%
1710
11th to 20thDay
36%37%17%29%8%
2159
21st to endDay
37%47%24%24%5%
3135
January1st to 10thNight
25%38%24%32%9%
2458
11th to 20thNight
26%37%20%33%11%
2367
21st to endNight
26%35%22%31%14%
2574
February1st to 10thNight
33%37%21%27%9%
2187
11th to 20thNight
31%37%23%25%11%
2098
21st to endNight
31%3419%25%17%
1776
March1st to 10thNight
32%46%18%22%17%
2062
11th to 20thNight
31%38%24%24%11%
1980
21st to endNight
29%412%24%23%8%
2178
April1st to 10thNight
26%410%23%23%15%
1980
11th to 20thNight
29%5%9%22%21%13%
1780
21st to endNight
29%5%9%27%23%7%
1620
May1st to 10thNight
30%5%11%20%24%9%
1620
11th to 20thNight
29%6%16%23%21%5%
1594
21st to endNight
26%7%15%27%21%5%
1746
June1st to 10thNight
18%7%18%33%19%6%
1620
11th to 20thNight
21%5%15%27%25%7%
1620
21st to endNight
19%49%27%31%11%
1620
July1st to 10thNight
24%8%15%29%21%3
1575
11th to 20thNight
15%5%10%30%33%7%
1566
21st to endNight
15%5%11%35%29%4
1673
August1st to 10thNight
17%5%11%30%27%10%
1601
11th to 20thNight
26%6%12%25%26%5%
1626
21st to endNight
16%7%14%28%27%8%
1996
September1st to 10thNight
25%49%22%28%11%
1980
11th to 20thNight
34%5%8%19%24%10%
1980
21st to endNight
23%45%24%30%14%
1980
October1st to 10thNight
23%49%24%26%14%
1980
11th to 20thNight
24%25%17%30%22%
2118
21st to endNight
25%35%23%28%16%
2376
November1st to 10thNight
22%26%23%31%15%
2337
11th to 20thNight
20%36%24%33%14%
2470
21st to endNight
28%36%22%28%15%
2470
December1st to 10thNight
25%38%26%27%11%
2470
11th to 20thNight
33%35%20%29%10%
3037
21st to endNight
32%37%21%27%9%
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
13%13%31%33%9%1
270
11th to 20thDay
16%15%33%26%9%1
246
21st to endDay
11%11%45%23%9%
264
February1st to 10thDay
18%12%40%27%3
240
11th to 20thDay
14%13%48%21%4
240
21st to endDay
22%16%41%16%5%1
198
March1st to 10thDay
17%17%36%21%9%
240
11th to 20thDay
18%17%38%18%8%2
240
21st to endDay
16%13%43%20%8%1
264
April1st to 10thDay
12%18%33%27%11%
240
11th to 20thDay
19%14%40%24%4
404
21st to endDay
15%15%34%26%8%2
600
May1st to 10thDay
9%10%41%30%9%1
603
11th to 20thDay
15%8%29%30%17%2
625
21st to endDay
13%6%33%27%18%5%
679
June1st to 10thDay
7%319%38%28%6%
630
11th to 20thDay
6%322%43%22%5%
630
21st to endDay
4216%41%29%7%
630
July1st to 10thDay
410%34%39%13%
621
11th to 20thDay
317%34%42%13%
618
21st to endDay
315%31%44%17%
684
August1st to 10thDay
5%18%37%41%9%
626
11th to 20thDay
8%210%33%38%10%
584
21st to endDay
5%15%32%41%16%
477
September1st to 10thDay
8%16%27%41%18%
270
11th to 20thDay
6%17%33%36%15%
270
21st to endDay
15%311%33%26%12%
270
October1st to 10thDay
8%321%37%24%7%
270
11th to 20thDay
10%10%28%35%16%1
270
21st to endDay
19%12%27%25%15%2
297
November1st to 10thDay
14%434%28%16%3
270
11th to 20thDay
11%12%31%26%16%4
270
21st to endDay
17%11%37%23%10%1
270
December1st to 10thDay
10%9%40%28%11%2
270
11th to 20thDay
14%13%31%30%11%1
270
21st to endDay
19%12%38%24%7%
297
January1st to 10thNight
9%10%38%35%7%
950
11th to 20thNight
12%9%34%38%7%
911
21st to endNight
10%10%36%36%8%
990
February1st to 10thNight
15%10%38%31%6%
747
11th to 20thNight
12%13%40%29%6%
704
21st to endNight
15%14%41%27%3
592
March1st to 10thNight
11%13%40%32%4
622
11th to 20thNight
18%11%35%30%6%
540
21st to endNight
10%15%42%28%6%
594
April1st to 10thNight
9%12%49%25%5%
540
11th to 20thNight
13%9%48%25%5%
533
21st to endNight
13%12%41%27%6%1
540
May1st to 10thNight
11%8%44%31%7%
540
11th to 20thNight
10%6%37%33%13%1
531
21st to endNight
7%435%38%13%3
584
June1st to 10thNight
4223%46%23%1
540
11th to 20thNight
5%330%50%12%
540
21st to endNight
4123%49%22%1
540
July1st to 10thNight
429%47%35%3
525
11th to 20thNight
2110%51%33%3
522
21st to endNight
316%50%38%3
591
August1st to 10thNight
2111%48%36%1
537
11th to 20thNight
7%12%44%36%1
534
21st to endNight
38%46%41%3
594
September1st to 10thNight
9%212%40%35%1
540
11th to 20thNight
12%218%37%29%1
540
21st to endNight
8%219%47%22%2
540
October1st to 10thNight
7%328%40%20%1
540
11th to 20thNight
10%6%32%37%14%1
678
21st to endNight
13%9%31%34%12%1
792
November1st to 10thNight
10%5%35%37%11%1
857
11th to 20thNight
6%8%37%35%13%1
950
21st to endNight
14%10%32%34%10%
950
December1st to 10thNight
11%8%34%37%9%
950
11th to 20thNight
15%8%37%33%6%
950
21st to endNight
14%8%39%32%7%
1045
Page generated at 2024-01-10 00:25:06. Version ac07

Copyright 2024 Attilla Danko


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