Amarillo
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Amarillo clear sky chart from 2005-11-06 to 2024-01-15.

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
45%
24241
31%
73896
17%
24184
59%
24184
44%
37725

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%
950
34%
2458
13%
946
56%
946
48%
1316
January11th to 20thNight
40%
925
35%
2405
14%
925
55%
925
50%
1296
January21st to endNight
41%
796
39%
2380
19%
796
60%
796
49%
1169
February1st to 10thNight
35%
720
34%
2160
14%
720
54%
720
42%
1130
February11th to 20thNight
30%
704
29%
2098
11%
700
46%
700
37%
1133
February21st to endNight
28%
592
38%
1776
11%
592
51%
592
43%
889
March1st to 10thNight
31%
720
31%
2160
12%
720
47%
720
42%
1126
March11th to 20thNight
35%
629
29%
2069
16%
629
50%
629
36%
1057
March21st to endNight
22%
594
33%
2070
10%
594
49%
594
36%
1019
April1st to 10thNight
28%
540
36%
1800
14%
540
55%
540
46%
829
April11th to 20thNight
23%
533
30%
1777
11%
533
48%
533
39%
896
April21st to endNight
29%
540
30%
1792
16%
540
53%
540
42%
862
May1st to 10thNight
34%
540
31%
1620
16%
540
56%
540
42%
852
May11th to 20thNight
42%
531
24%
1593
17%
531
54%
531
38%
891
May21st to endNight
36%
583
23%
1745
13%
582
50%
582
38%
974
June1st to 10thNight
47%
540
22%
1620
13%
540
59%
540
43%
848
June11th to 20thNight
42%
540
28%
1525
14%
540
57%
540
52%
773
June21st to endNight
57%
540
28%
1440
20%
540
65%
540
54%
761
July1st to 10thNight
65%
525
24%
1400
19%
525
69%
525
43%
823
July11th to 20thNight
75%
522
25%
1515
24%
522
78%
522
49%
790
July21st to endNight
79%
591
27%
1673
26%
558
81%
558
48%
869
August1st to 10thNight
74%
537
24%
1753
27%
534
77%
534
42%
900
August11th to 20thNight
68%
534
21%
1778
25%
534
71%
534
33%
1013
August21st to endNight
73%
594
26%
1980
29%
594
77%
594
41%
1030
September1st to 10thNight
72%
540
28%
1810
29%
540
77%
540
42%
924
September11th to 20thNight
57%
540
30%
1980
26%
540
67%
540
35%
1036
September21st to endNight
61%
540
36%
1980
32%
540
71%
540
49%
856
October1st to 10thNight
49%
540
33%
1980
24%
540
62%
540
39%
980
October11th to 20thNight
46%
562
40%
2002
22%
562
66%
562
50%
849
October21st to endNight
49%
937
37%
2521
16%
937
61%
937
54%
1280
November1st to 10thNight
51%
925
36%
2405
14%
925
63%
925
61%
1185
November11th to 20thNight
46%
950
38%
2470
14%
950
59%
950
58%
1234
November21st to endNight
46%
950
37%
2470
16%
950
58%
950
49%
1339
December1st to 10thNight
44%
950
36%
2470
15%
950
58%
950
47%
1352
December11th to 20thNight
38%
950
37%
2881
15%
949
53%
949
42%
1523
December21st to endNight
35%
1037
24%
4340
14%
1026
51%
1026
34%
1921

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
5%42342445%7%60%
75356
Night
5%32332345%7%61%
74443
TransparencyDay
24%49%23%27%14%
75076
Night
22%49%22%27%15%
74246
SeeingDay
7%7%28%34%20%5%
14156
Night
7%7%37%38%11%1
24250

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
25%34324347%63%
1707
11th to 20thDay
6%41232333468%
1670
21st to endDay
4323323347%65%
1980
February1st to 10thDay
5%6%2432335%6%61%
1800
11th to 20thDay
5%6%35%323435%60%
1749
21st to endDay
442432445%7%62%
1480
March1st to 10thDay
6%5%2342445%8%58%
1800
11th to 20thDay
8%5%24423346%59%
1890
21st to endDay
6%424324446%60%
2281
April1st to 10thDay
5%423323445%66%
2160
11th to 20thDay
7%42332335%6%59%
2131
21st to endDay
5%3134245%5%7%62%
2168
May1st to 10thDay
7%42332345%6%60%
2340
11th to 20thDay
7%42432346%8%56%
2302
21st to endDay
5%42342445%9%58%
2531
June1st to 10thDay
5%3244345%6%10%55%
2340
11th to 20thDay
331333445%8%63%
2428
21st to endDay
3213335%5%6%9%59%
2520
July1st to 10thDay
7%3144345%7%8%53%
2520
11th to 20thDay
42134346%6%8%59%
2387
21st to endDay
33145%35%6%7%10%52%
2546
August1st to 10thDay
32135%35%6%6%11%55%
2171
11th to 20thDay
6%324435%5%6%9%54%
2123
21st to endDay
6%4235%35%5%6%11%52%
2376
September1st to 10thDay
6%425%435%447%56%
2148
11th to 20thDay
7%4245%3445%6%56%
1980
21st to endDay
5%212323447%67%
1980
October1st to 10thDay
9%414324445%60%
1980
11th to 20thDay
6%31331233471%
1955
21st to endDay
7%413312225%69%
1814
November1st to 10thDay
4323322347%69%
1673
11th to 20thDay
2323323345%70%
1710
21st to endDay
8%424323335%63%
1710
December1st to 10thDay
5%313433446%64%
1710
11th to 20thDay
6%42343446%7%58%
2161
21st to endDay
5%5%25%323445%61%
3135
January1st to 10thNight
3424333446%63%
2458
11th to 20thNight
5%414323347%64%
2405
21st to endNight
5%323424347%65%
2380
February1st to 10thNight
5%5%235%24336%62%
2160
11th to 20thNight
5%5%25%423347%58%
2098
21st to endNight
6%2233345%5%7%60%
1776
March1st to 10thNight
5%5%2342445%7%58%
2160
11th to 20thNight
8%425%323345%61%
2069
21st to endNight
5%4244335%5%7%59%
2070
April1st to 10thNight
431332245%8%65%
1800
11th to 20thNight
7%4143235%6%6%59%
1777
21st to endNight
6%41332346%8%62%
1792
May1st to 10thNight
5%423334447%61%
1620
11th to 20thNight
7%5%2333445%8%57%
1593
21st to endNight
7%42443445%8%56%
1745
June1st to 10thNight
33134245%8%12%54%
1620
11th to 20thNight
3212325%46%8%64%
1525
21st to endNight
33122345%6%10%61%
1440
July1st to 10thNight
4325%5%345%7%10%53%
1440
11th to 20thNight
32135%35%5%6%11%57%
1566
21st to endNight
3214325%5%7%13%55%
1772
August1st to 10thNight
32135%35%6%8%12%51%
1763
11th to 20thNight
6%425%5%46%7%7%11%45%
1778
21st to endNight
4323425%6%8%9%54%
1980
September1st to 10thNight
5%32342345%8%59%
1810
11th to 20thNight
7%5%2442346%7%55%
1980
21st to endNight
6%211323448%66%
1980
October1st to 10thNight
7%424323335%62%
1980
11th to 20thNight
6%313212235%73%
2002
21st to endNight
6%312223345%68%
2521
November1st to 10thNight
4312222346%72%
2405
11th to 20thNight
2313323345%71%
2470
21st to endNight
6%423322347%63%
2470
December1st to 10thNight
5%5%1432335%7%62%
2470
11th to 20thNight
442443435%7%60%
3036
21st to endNight
5%324433447%61%
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
22%37%27%29%12%
1708
11th to 20thDay
21%36%26%30%14%
1670
21st to endDay
21%36%22%35%13%
1980
February1st to 10thDay
25%39%24%26%14%
1800
11th to 20thDay
28%36%23%26%14%
1759
21st to endDay
23%3419%32%20%
1480
March1st to 10thDay
26%36%19%28%18%
1800
11th to 20thDay
27%37%20%28%15%
1890
21st to endDay
25%47%25%25%15%
2281
April1st to 10thDay
21%46%17%29%23%
2160
11th to 20thDay
26%36%18%27%19%
2134
21st to endDay
21%411%24%27%13%
2168
May1st to 10thDay
25%5%8%19%23%20%
2340
11th to 20thDay
27%5%11%23%26%9%
2306
21st to endDay
24%5%13%23%19%16%
2531
June1st to 10thDay
25%5%15%27%17%11%
2340
11th to 20thDay
19%5%9%23%24%20%
2428
21st to endDay
20%6%11%25%23%14%
2520
July1st to 10thDay
27%8%12%25%21%7%
2451
11th to 20thDay
19%6%10%27%28%9%
2315
21st to endDay
25%8%15%31%19%3
2405
August1st to 10thDay
21%8%14%32%18%6%
2157
11th to 20thDay
26%7%13%25%22%7%
2123
21st to endDay
27%6%13%26%20%8%
2376
September1st to 10thDay
26%6%12%21%22%12%
2148
11th to 20thDay
28%5%9%20%29%8%
1980
21st to endDay
18%47%24%33%14%
1980
October1st to 10thDay
27%6%8%21%27%12%
1980
11th to 20thDay
19%36%13%36%23%
1955
21st to endDay
21%25%24%33%16%
1814
November1st to 10thDay
18%26%18%36%20%
1673
11th to 20thDay
16%46%25%33%16%
1710
21st to endDay
26%2416%32%19%
1710
December1st to 10thDay
22%39%26%29%11%
1710
11th to 20thDay
26%37%21%28%15%
2159
21st to endDay
25%26%23%30%14%
3135
January1st to 10thNight
22%37%24%31%13%
2458
11th to 20thNight
22%36%21%32%16%
2405
21st to endNight
21%36%22%35%14%
2380
February1st to 10thNight
25%36%20%29%16%
2160
11th to 20thNight
28%37%20%24%17%
2098
21st to endNight
22%3419%29%23%
1776
March1st to 10thNight
24%47%19%27%19%
2160
11th to 20thNight
27%35%23%24%18%
2069
21st to endNight
24%5%8%24%23%16%
2070
April1st to 10thNight
19%47%21%26%23%
1800
11th to 20thNight
23%5%9%21%23%17%
1777
21st to endNight
21%5%11%26%23%14%
1792
May1st to 10thNight
24%5%8%17%25%22%
1620
11th to 20thNight
26%7%12%20%22%13%
1594
21st to endNight
27%6%13%19%16%18%
1746
June1st to 10thNight
21%8%19%27%15%10%
1620
11th to 20thNight
17%6%13%21%23%20%
1525
21st to endNight
18%7%14%28%21%12%
1440
July1st to 10thNight
25%8%13%30%18%6%
1400
11th to 20thNight
21%5%13%22%29%10%
1515
21st to endNight
20%7%16%31%23%4
1673
August1st to 10thNight
21%9%16%29%18%8%
1753
11th to 20thNight
31%7%15%22%19%6%
1778
21st to endNight
22%9%14%29%20%7%
1980
September1st to 10thNight
24%6%13%22%22%13%
1810
11th to 20thNight
28%6%10%23%24%9%
1980
21st to endNight
18%49%22%33%15%
1980
October1st to 10thNight
25%410%18%26%17%
1980
11th to 20thNight
17%37%14%34%25%
2002
21st to endNight
19%35%22%33%18%
2521
November1st to 10thNight
15%27%20%34%21%
2405
11th to 20thNight
16%3425%35%17%
2470
21st to endNight
23%3418%32%20%
2470
December1st to 10thNight
24%37%25%27%14%
2470
11th to 20thNight
24%35%20%33%15%
3037
21st to endNight
23%38%22%30%15%
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
6%9%46%27%10%1
270
11th to 20thDay
11%15%34%27%12%
254
21st to endDay
6%9%41%32%11%2
264
February1st to 10thDay
8%9%39%32%13%
240
11th to 20thDay
11%13%42%23%9%3
240
21st to endDay
8%15%46%25%7%
198
March1st to 10thDay
7%8%45%33%7%
240
11th to 20thDay
13%14%34%25%12%2
240
21st to endDay
10%13%43%24%9%1
367
April1st to 10thDay
8%14%45%24%8%1
420
11th to 20thDay
10%17%40%27%6%
412
21st to endDay
10%14%38%27%10%1
428
May1st to 10thDay
8%9%37%32%13%1
603
11th to 20thDay
10%8%30%32%18%3
625
21st to endDay
7%8%35%33%15%2
679
June1st to 10thDay
7%326%39%21%4
630
11th to 20thDay
3332%38%20%4
630
21st to endDay
4322%42%24%5%
630
July1st to 10thDay
7%211%35%33%13%
621
11th to 20thDay
318%40%37%12%
618
21st to endDay
37%36%43%12%
684
August1st to 10thDay
411%39%36%10%
469
11th to 20thDay
5%210%39%31%12%
437
21st to endDay
6%111%41%32%9%
495
September1st to 10thDay
5%111%39%34%8%
438
11th to 20thDay
3112%45%30%9%
270
21st to endDay
6%321%32%30%7%
270
October1st to 10thDay
11%331%29%23%3
270
11th to 20thDay
6%6%29%40%16%4
270
21st to endDay
14%8%29%28%18%4
297
November1st to 10thDay
8%7%31%34%16%3
270
11th to 20thDay
410%33%36%13%3
270
21st to endDay
16%11%32%27%11%3
270
December1st to 10thDay
6%10%39%31%12%3
270
11th to 20thDay
9%9%33%40%9%
270
21st to endDay
10%14%44%21%9%
297
January1st to 10thNight
5%11%39%39%7%
950
11th to 20thNight
7%8%41%33%10%1
925
21st to endNight
6%6%43%36%8%
796
February1st to 10thNight
8%10%44%33%5%1
720
11th to 20thNight
8%12%47%28%5%
704
21st to endNight
8%12%48%27%4
592
March1st to 10thNight
8%11%47%30%3
720
11th to 20thNight
9%14%39%32%6%
629
21st to endNight
6%15%55%22%3
594
April1st to 10thNight
5%11%54%28%2
540
11th to 20thNight
9%11%55%23%2
533
21st to endNight
8%11%49%26%5%
540
May1st to 10thNight
6%10%48%31%5%
540
11th to 20thNight
10%8%38%34%9%1
531
21st to endNight
7%8%47%32%7%
584
June1st to 10thNight
45%39%42%10%
540
11th to 20thNight
4448%38%6%
540
21st to endNight
3235%46%14%
540
July1st to 10thNight
4119%52%22%2
525
11th to 20thNight
3114%56%26%
522
21st to endNight
4111%56%28%1
591
August1st to 10thNight
3113%52%29%1
537
11th to 20thNight
6%315%54%21%1
534
21st to endNight
4114%50%29%2
594
September1st to 10thNight
6%115%57%21%1
540
11th to 20thNight
8%224%50%15%
540
21st to endNight
7%327%42%19%1
540
October1st to 10thNight
10%433%42%11%1
540
11th to 20thNight
7%8%38%38%8%1
562
21st to endNight
8%7%33%34%16%1
937
November1st to 10thNight
6%6%35%39%14%1
925
11th to 20thNight
39%39%37%12%1
950
21st to endNight
7%9%35%37%12%
950
December1st to 10thNight
7%9%36%38%9%1
950
11th to 20thNight
8%9%42%34%7%1
950
21st to endNight
9%11%40%33%6%
1045
Page generated at 2024-01-12 15:17:44. Version ac07

Copyright 2024 Attilla Danko


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