Tehachapi Municipal Airport
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Tehachapi Municipal Airport clear sky chart from 2005-11-06 to 2024-02-25.

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%
24288
33%
79728
23%
24178
66%
24178
42%
39671

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
41%
755
31%
4297
17%
736
55%
736
20%
1980
January11th to 20thNight
45%
757
29%
4115
20%
740
63%
740
22%
2089
January21st to endNight
39%
835
22%
4078
20%
814
55%
814
18%
2339
February1st to 10thNight
39%
760
30%
2280
19%
760
53%
760
32%
1321
February11th to 20thNight
41%
740
33%
2219
21%
740
58%
740
36%
1228
February21st to endNight
40%
610
27%
1829
20%
610
52%
610
31%
1058
March1st to 10thNight
38%
720
24%
2160
15%
720
52%
720
27%
1293
March11th to 20thNight
43%
720
23%
2099
16%
720
53%
720
30%
1255
March21st to endNight
38%
792
28%
1980
11%
792
51%
792
34%
1218
April1st to 10thNight
35%
720
29%
1800
11%
720
47%
720
35%
1075
April11th to 20thNight
39%
711
35%
1779
11%
711
53%
711
44%
957
April21st to endNight
42%
720
34%
1800
10%
720
53%
720
46%
952
May1st to 10thNight
39%
648
32%
1728
12%
648
49%
648
48%
866
May11th to 20thNight
47%
531
38%
1595
20%
531
59%
531
49%
712
May21st to endNight
40%
582
33%
1746
16%
582
53%
582
47%
786
June1st to 10thNight
50%
396
35%
1476
24%
396
66%
396
54%
563
June11th to 20thNight
60%
360
43%
1440
36%
360
78%
360
71%
440
June21st to endNight
62%
360
42%
1440
38%
360
78%
360
74%
441
July1st to 10thNight
80%
350
39%
1400
38%
350
90%
350
73%
438
July11th to 20thNight
86%
348
41%
1392
46%
348
90%
348
65%
472
July21st to endNight
80%
651
39%
1732
29%
616
82%
616
70%
761
August1st to 10thNight
74%
716
37%
1780
22%
712
76%
712
77%
818
August11th to 20thNight
83%
712
41%
1780
23%
712
86%
712
83%
795
August21st to endNight
85%
792
46%
1980
29%
792
87%
792
80%
893
September1st to 10thNight
83%
720
46%
1800
32%
720
87%
720
80%
810
September11th to 20thNight
77%
720
48%
1912
34%
720
86%
720
81%
802
September21st to endNight
74%
720
47%
1980
35%
720
86%
720
74%
832
October1st to 10thNight
65%
720
39%
1980
28%
720
78%
720
59%
945
October11th to 20thNight
64%
720
41%
2136
33%
720
76%
720
57%
959
October21st to endNight
61%
792
43%
2416
35%
792
75%
792
56%
1070
November1st to 10thNight
58%
740
35%
2405
30%
740
70%
740
45%
1137
November11th to 20thNight
59%
760
36%
2470
29%
760
72%
760
48%
1149
November21st to endNight
50%
760
31%
2470
25%
760
61%
760
36%
1293
December1st to 10thNight
45%
760
31%
2470
21%
760
59%
760
36%
1313
December11th to 20thNight
42%
759
26%
3026
21%
759
53%
759
21%
1874
December21st to endNight
41%
831
18%
4738
21%
817
54%
817
16%
2737

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
231332445%6%66%
78711
Night
23244345%6%7%61%
80605
TransparencyDay
17%6%5%17%27%28%
78429
Night
19%8%5%17%27%24%
80408
SeeingDay
7%17%34%29%11%2
14459
Night
5%12%25%34%19%4
24309

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 10thDay
3324435%5%13%7%51%
2539
11th to 20thDay
3324436%8%10%11%47%
2737
21st to endDay
6%5%36%6%36%6%7%9%42%
3317
February1st to 10thDay
5%5%34435%46%5%56%
1900
11th to 20thDay
4423436%5%8%9%53%
1850
21st to endDay
45%35%5%36%5%7%7%51%
1521
March1st to 10thDay
35%36%5%47%7%8%8%44%
1800
11th to 20thDay
35%25%5%36%6%6%10%49%
1857
21st to endDay
33245%36%6%7%7%54%
2376
April1st to 10thDay
43244345%5%8%57%
2160
11th to 20thDay
32143245%5%7%65%
2129
21st to endDay
122332336%10%66%
2160
May1st to 10thDay
121332345%8%68%
2231
11th to 20thDay
221231335%7%70%
2301
21st to endDay
221342445%6%68%
2530
June1st to 10thDay
1211223448%73%
2479
11th to 20thDay
1111222388%
2520
21st to endDay
11111223385%
2520
July1st to 10thDay
11212236%82%
2520
11th to 20thDay
221221223478%
2520
21st to endDay
2212212346%75%
2478
August1st to 10thDay
11221223381%
2149
11th to 20thDay
11111223484%
2122
21st to endDay
11121223483%
2376
September1st to 10thDay
111212235%82%
2160
11th to 20thDay
111122387%
2048
21st to endDay
1221223482%
1980
October1st to 10thDay
2123324346%71%
1980
11th to 20thDay
1212312335%77%
1819
21st to endDay
111222335%6%73%
1937
November1st to 10thDay
232442445%6%65%
1674
11th to 20thDay
22123245%47%66%
1710
21st to endDay
24234445%6%7%59%
1710
December1st to 10thDay
34234345%7%8%57%
1710
11th to 20thDay
7%6%35%5%5%5%6%7%7%43%
2097
21st to endDay
5%7%36%6%46%5%8%8%41%
2794
January1st to 10thNight
3436%5%35%6%10%8%48%
4406
11th to 20thNight
2335%6%5%6%8%9%11%44%
4225
21st to endNight
5%7%36%5%45%7%10%8%40%
4338
February1st to 10thNight
45%37%5%35%5%6%6%50%
2280
11th to 20thNight
34245%45%47%7%53%
2218
21st to endNight
4325%5%46%6%8%7%49%
1829
March1st to 10thNight
3435%6%47%6%7%9%45%
2160
11th to 20thNight
25%25%6%5%7%7%9%7%45%
2099
21st to endNight
33345%46%8%9%7%48%
1980
April1st to 10thNight
3325%45%5%5%6%8%54%
1800
11th to 20thNight
22223345%7%6%63%
1779
21st to endNight
22233345%6%6%65%
1800
May1st to 10thNight
12123245%6%7%67%
1728
11th to 20thNight
211232335%5%73%
1594
21st to endNight
1112323346%73%
1746
June1st to 10thNight
111223345%6%74%
1476
11th to 20thNight
111213387%
1440
21st to endNight
1111122387%
1440
July1st to 10thNight
11121223483%
1440
11th to 20thNight
211123235%80%
1440
21st to endNight
2112212235%77%
1833
August1st to 10thNight
221121124482%
1790
11th to 20thNight
11111222486%
1780
21st to endNight
11121122485%
1980
September1st to 10thNight
11111121387%
1800
11th to 20thNight
1111223485%
1912
21st to endNight
121233384%
1980
October1st to 10thNight
223223446%73%
1980
11th to 20thNight
111232345%5%72%
2136
21st to endNight
1212313345%74%
2416
November1st to 10thNight
13133445%6%7%62%
2405
11th to 20thNight
22134345%6%7%63%
2470
21st to endNight
33345%46%6%6%7%54%
2470
December1st to 10thNight
3426%336%6%6%7%54%
2470
11th to 20thNight
6%5%37%6%46%6%8%10%41%
3103
21st to endNight
6%6%36%7%47%7%9%8%37%
4862

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
20%12%5%32%25%7%
2539
11th to 20thDay
25%11%10%23%22%9%
2737
21st to endDay
32%10%7%22%19%10%
3317
February1st to 10thDay
26%7%5%19%23%20%
1900
11th to 20thDay
23%7%420%30%16%
1860
21st to endDay
26%9%6%20%30%9%
1521
March1st to 10thDay
31%8%8%19%20%14%
1800
11th to 20thDay
26%9%8%20%23%15%
1857
21st to endDay
23%9%9%27%22%10%
2376
April1st to 10thDay
23%7%8%25%25%12%
2160
11th to 20thDay
17%5%7%27%29%15%
2132
21st to endDay
14%5%10%25%35%11%
2160
May1st to 10thDay
13%6%6%22%36%16%
2231
11th to 20thDay
12%5%5%22%37%18%
2304
21st to endDay
16%5%5%23%38%13%
2530
June1st to 10thDay
12%46%17%33%28%
2479
11th to 20thDay
42413%29%49%
2520
21st to endDay
6%22424%61%
2520
July1st to 10thDay
7%227%18%64%
2451
11th to 20thDay
11%329%28%47%
2445
21st to endDay
13%2414%31%36%
2339
August1st to 10thDay
10%228%21%58%
2135
11th to 20thDay
7%227%27%55%
2122
21st to endDay
7%215%32%52%
2376
September1st to 10thDay
8%226%26%56%
2160
11th to 20thDay
6%129%32%50%
2048
21st to endDay
7%229%38%41%
1980
October1st to 10thDay
15%4315%26%37%
1980
11th to 20thDay
11%3312%32%39%
1819
21st to endDay
11%4312%31%39%
1937
November1st to 10thDay
16%8%415%33%24%
1674
11th to 20thDay
16%5%5%18%27%28%
1710
21st to endDay
23%7%6%14%25%25%
1710
December1st to 10thDay
23%8%5%20%24%20%
1710
11th to 20thDay
33%12%7%17%20%12%
2096
21st to endDay
35%11%5%21%20%9%
2794
January1st to 10thNight
22%13%5%22%28%9%
4406
11th to 20thNight
23%14%9%22%21%10%
4225
21st to endNight
31%11%6%21%20%11%
4338
February1st to 10thNight
27%10%5%14%23%22%
2280
11th to 20thNight
25%8%416%28%19%
2219
21st to endNight
26%10%6%18%28%11%
1829
March1st to 10thNight
30%10%6%19%20%15%
2160
11th to 20thNight
28%11%7%15%24%14%
2099
21st to endNight
24%11%8%28%21%8%
1980
April1st to 10thNight
23%10%9%25%23%11%
1800
11th to 20thNight
17%6%8%27%29%13%
1779
21st to endNight
15%6%6%30%34%8%
1800
May1st to 10thNight
13%7%7%26%36%11%
1728
11th to 20thNight
13%5%5%24%43%11%
1595
21st to endNight
12%6%7%27%38%10%
1746
June1st to 10thNight
11%48%19%35%23%
1476
11th to 20thNight
5%2415%33%41%
1440
21st to endNight
5%225%30%55%
1440
July1st to 10thNight
6%226%23%61%
1400
11th to 20thNight
9%3313%27%46%
1392
21st to endNight
11%2316%34%34%
1732
August1st to 10thNight
8%248%24%54%
1780
11th to 20thNight
6%228%31%51%
1780
21st to endNight
7%216%35%49%
1980
September1st to 10thNight
6%227%28%54%
1800
11th to 20thNight
43210%37%44%
1912
21st to endNight
6%3112%37%41%
1980
October1st to 10thNight
12%5%315%27%38%
1980
11th to 20thNight
11%6%314%29%37%
2136
21st to endNight
10%7%310%30%40%
2416
November1st to 10thNight
16%9%316%31%26%
2405
11th to 20thNight
17%6%5%13%29%30%
2470
21st to endNight
24%7%6%14%23%26%
2470
December1st to 10thNight
23%9%5%15%26%22%
2470
11th to 20thNight
33%13%7%16%19%12%
3103
21st to endNight
33%13%5%17%22%10%
4862

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
16%22%37%19%6%
180
11th to 20thDay
15%24%34%19%7%
299
21st to endDay
12%26%37%18%6%1
458
February1st to 10thDay
12%25%35%20%5%2
460
11th to 20thDay
14%30%30%20%6%1
455
21st to endDay
14%27%37%18%4
363
March1st to 10thDay
15%32%31%17%5%
420
11th to 20thDay
14%29%29%20%7%1
420
21st to endDay
15%32%33%15%4
462
April1st to 10thDay
14%25%34%18%9%1
420
11th to 20thDay
14%28%35%17%5%1
412
21st to endDay
9%26%33%17%12%3
420
May1st to 10thDay
9%25%35%23%8%1
423
11th to 20thDay
7%21%36%26%9%1
448
21st to endDay
8%22%31%28%10%1
485
June1st to 10thDay
414%38%29%13%2
450
11th to 20thDay
213%38%32%14%2
450
21st to endDay
211%41%29%14%3
450
July1st to 10thDay
5%38%39%14%4
446
11th to 20thDay
1226%46%19%6%
444
21st to endDay
1231%43%18%6%
487
August1st to 10thDay
16%38%38%13%4
447
11th to 20thDay
2230%43%18%5%
437
21st to endDay
1336%41%15%5%
495
September1st to 10thDay
16%37%38%16%3
450
11th to 20thDay
112%38%36%10%2
450
21st to endDay
311%34%35%15%2
450
October1st to 10thDay
5%15%34%32%14%
450
11th to 20thDay
415%35%36%9%1
450
21st to endDay
5%17%34%31%12%2
452
November1st to 10thDay
8%14%32%33%12%1
270
11th to 20thDay
8%13%38%31%9%1
270
21st to endDay
6%23%35%24%10%1
270
December1st to 10thDay
7%20%37%29%6%
270
11th to 20thDay
10%19%35%25%11%1
248
21st to endDay
16%30%26%21%7%1
198
January1st to 10thNight
11%12%31%29%12%6%
760
11th to 20thNight
5%14%31%34%13%3
760
21st to endNight
10%18%28%30%11%3
836
February1st to 10thNight
8%17%32%24%15%4
760
11th to 20thNight
8%15%31%26%15%4
744
21st to endNight
9%19%29%30%10%3
610
March1st to 10thNight
8%19%31%30%10%2
720
11th to 20thNight
9%17%27%28%15%4
720
21st to endNight
8%23%28%28%13%1
792
April1st to 10thNight
7%23%31%24%12%3
720
11th to 20thNight
7%21%30%28%12%2
711
21st to endNight
424%29%26%14%3
720
May1st to 10thNight
420%36%28%12%1
648
11th to 20thNight
320%28%36%13%1
531
21st to endNight
5%20%32%31%12%
584
June1st to 10thNight
211%36%40%11%1
396
11th to 20thNight
8%31%44%16%1
360
21st to endNight
432%44%21%
360
July1st to 10thNight
115%51%32%1
350
11th to 20thNight
27%54%36%1
348
21st to endNight
2112%44%37%4
651
August1st to 10thNight
2119%45%30%3
716
11th to 20thNight
114%44%35%7%
712
21st to endNight
1111%44%35%8%
792
September1st to 10thNight
1311%41%37%7%
720
11th to 20thNight
218%43%30%6%
720
21st to endNight
16%17%39%29%8%
720
October1st to 10thNight
38%21%43%23%2
720
11th to 20thNight
38%22%37%23%7%
720
21st to endNight
310%24%33%21%10%
792
November1st to 10thNight
411%24%34%21%6%
740
11th to 20thNight
47%27%37%20%6%
760
21st to endNight
5%14%28%33%18%4
760
December1st to 10thNight
7%12%31%31%16%3
760
11th to 20thNight
11%14%30%32%12%2
760
21st to endNight
11%15%29%30%12%2
836
Page generated at 2024-02-22 03:05:41. Version ac07

Copyright 2024 Attilla Danko


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