Carrizo Plain National Monument
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carrizo Plain National Monument 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
75%
24239
32%
80078
31%
24165
78%
24165
46%
39549

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
58%
748
25%
4252
22%
736
62%
736
18%
2238
January11th to 20thNight
65%
747
26%
4043
29%
740
71%
740
21%
2210
January21st to endNight
60%
825
18%
4380
29%
814
65%
814
18%
2631
February1st to 10thNight
61%
760
30%
2310
30%
760
66%
760
37%
1293
February11th to 20thNight
64%
740
32%
2219
31%
740
70%
740
43%
1176
February21st to endNight
60%
610
26%
1829
25%
610
64%
610
37%
1034
March1st to 10thNight
61%
720
21%
2160
21%
720
65%
720
33%
1260
March11th to 20thNight
65%
720
23%
1996
22%
720
68%
720
37%
1184
March21st to endNight
64%
792
25%
2036
18%
792
68%
792
46%
1157
April1st to 10thNight
67%
720
28%
1800
18%
720
70%
720
47%
1040
April11th to 20thNight
69%
711
34%
1779
19%
711
73%
711
55%
948
April21st to endNight
73%
720
33%
1800
17%
720
77%
720
63%
899
May1st to 10thNight
78%
720
32%
1800
19%
720
80%
720
70%
860
May11th to 20thNight
78%
567
38%
1631
28%
567
80%
567
67%
713
May21st to endNight
74%
478
34%
1642
30%
478
79%
478
63%
626
June1st to 10thNight
85%
360
37%
1440
43%
360
88%
360
64%
498
June11th to 20thNight
90%
360
43%
1440
50%
360
94%
360
83%
411
June21st to endNight
94%
360
44%
1440
53%
360
96%
360
85%
406
July1st to 10thNight
97%
350
41%
1400
49%
350
98%
350
84%
397
July11th to 20thNight
96%
425
41%
1469
42%
425
96%
425
79%
494
July21st to endNight
93%
592
42%
1675
35%
559
94%
559
75%
670
August1st to 10thNight
93%
716
39%
1780
26%
712
93%
712
82%
794
August11th to 20thNight
97%
712
43%
1780
27%
712
97%
712
86%
775
August21st to endNight
96%
792
47%
1980
32%
792
96%
792
87%
856
September1st to 10thNight
93%
720
46%
1800
36%
720
94%
720
82%
804
September11th to 20thNight
90%
720
49%
1847
42%
720
92%
720
82%
802
September21st to endNight
90%
720
46%
1980
44%
720
93%
720
81%
818
October1st to 10thNight
83%
720
37%
2070
38%
720
86%
720
64%
933
October11th to 20thNight
82%
720
39%
2160
40%
720
86%
720
59%
981
October21st to endNight
81%
792
43%
2376
45%
792
85%
792
64%
1035
November1st to 10thNight
75%
740
35%
2353
36%
740
78%
740
50%
1115
November11th to 20thNight
75%
760
33%
2470
34%
760
79%
760
49%
1165
November21st to endNight
67%
760
30%
2470
31%
760
71%
760
40%
1288
December1st to 10thNight
65%
760
29%
2470
28%
760
70%
760
37%
1321
December11th to 20thNight
61%
758
23%
3210
28%
758
65%
758
22%
1983
December21st to endNight
57%
824
15%
4791
25%
817
62%
817
17%
2734

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
3313323446%66%
78628
Night
442442345%7%63%
80701
TransparencyDay
18%5%9%19%28%22%
78345
Night
20%6%9%20%25%19%
80506
SeeingDay
5%7%19%32%27%9%
14527
Night
4411%35%37%9%
24295

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
46%35%5%35%5%6%8%50%
2603
11th to 20thDay
5%5%245%46%5%7%9%47%
2860
21st to endDay
7%8%36%6%46%6%7%9%38%
3146
February1st to 10thDay
7%6%35%42345%7%54%
1867
11th to 20thDay
5%5%26%4345%6%8%53%
1850
21st to endDay
6%5%35%5%35%448%52%
1521
March1st to 10thDay
5%6%36%6%5%6%6%6%9%42%
1800
11th to 20thDay
46%25%435%5%6%10%50%
1961
21st to endDay
34245%35%5%6%8%54%
2318
April1st to 10thDay
6%424435%45%9%55%
2160
11th to 20thDay
332332445%8%63%
2129
21st to endDay
4311324348%67%
2160
May1st to 10thDay
3312223347%71%
2160
11th to 20thDay
3212323347%71%
2264
21st to endDay
3212224446%71%
2628
June1st to 10thDay
2112223347%74%
2520
11th to 20thDay
11111122388%
2520
21st to endDay
111212389%
2520
July1st to 10thDay
1111123487%
2520
11th to 20thDay
1111212235%81%
2439
21st to endDay
1111213345%78%
2542
August1st to 10thDay
111121222484%
2149
11th to 20thDay
111112290%
2122
21st to endDay
11111222387%
2376
September1st to 10thDay
111111112487%
2160
11th to 20thDay
11111122386%
2111
21st to endDay
111121123484%
1980
October1st to 10thDay
2222223346%73%
1886
11th to 20thDay
2313323245%74%
1800
21st to endDay
121232335%7%72%
1980
November1st to 10thDay
4423423346%64%
1724
11th to 20thDay
33144236%5%5%63%
1710
21st to endDay
5%4244345%5%6%57%
1710
December1st to 10thDay
6%435%435%5%5%8%51%
1710
11th to 20thDay
9%8%37%6%35%5%7%9%38%
1928
21st to endDay
7%9%36%7%46%5%6%7%40%
2794
January1st to 10thNight
5%11%36%5%4445%7%46%
4340
11th to 20thNight
6%6%37%7%35%5%6%8%44%
4110
21st to endNight
8%9%36%7%35%6%6%8%38%
4521
February1st to 10thNight
6%6%35%5%2435%6%55%
2310
11th to 20thNight
5%4244235%6%8%56%
2218
21st to endNight
5%325%5%35%46%7%55%
1829
March1st to 10thNight
5%5%345%35%6%7%10%46%
2160
11th to 20thNight
46%25%5%45%5%7%8%50%
1996
21st to endNight
5%3234335%6%9%58%
2036
April1st to 10thNight
4323325%5%5%8%59%
1800
11th to 20thNight
3313323245%70%
1779
21st to endNight
2212223448%71%
1800
May1st to 10thNight
211221225%8%75%
1800
11th to 20thNight
211121225%6%77%
1630
21st to endNight
112222245%79%
1642
June1st to 10thNight
112213235%80%
1440
11th to 20thNight
111113389%
1440
21st to endNight
11112292%
1440
July1st to 10thNight
111235%86%
1440
11th to 20thNight
11111123485%
1517
21st to endNight
111212245%81%
1774
August1st to 10thNight
11111122287%
1790
11th to 20thNight
111222487%
1780
21st to endNight
1111112389%
1980
September1st to 10thNight
11111222387%
1800
11th to 20thNight
1111122485%
1847
21st to endNight
11111223485%
1980
October1st to 10thNight
2212322245%76%
2070
11th to 20thNight
2212323446%72%
2160
21st to endNight
2212312245%76%
2376
November1st to 10thNight
3323324348%64%
2353
11th to 20thNight
332342345%8%64%
2470
21st to endNight
44245%35%5%6%8%54%
2470
December1st to 10thNight
5%5%25%5%345%6%8%53%
2470
11th to 20thNight
8%8%37%5%45%5%7%9%39%
3271
21st to endNight
8%9%37%6%46%6%6%7%38%
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
24%10%15%31%15%5%
2603
11th to 20thDay
28%10%15%23%15%10%
2860
21st to endDay
35%11%14%17%15%9%
3146
February1st to 10thDay
29%48%19%23%16%
1867
11th to 20thDay
27%6%10%22%25%11%
1860
21st to endDay
28%7%11%23%24%6%
1521
March1st to 10thDay
35%7%11%18%20%9%
1800
11th to 20thDay
27%7%15%21%21%8%
1961
21st to endDay
26%8%14%26%19%7%
2318
April1st to 10thDay
26%5%13%25%21%9%
2160
11th to 20thDay
20%5%13%27%25%10%
2132
21st to endDay
16%6%12%27%32%7%
2160
May1st to 10thDay
14%5%11%23%35%13%
2160
11th to 20thDay
13%39%28%33%14%
2267
21st to endDay
15%410%30%34%8%
2628
June1st to 10thDay
10%5%10%20%35%20%
2520
11th to 20thDay
416%16%37%35%
2520
21st to endDay
5%137%34%49%
2520
July1st to 10thDay
4137%31%54%
2451
11th to 20thDay
9%25%11%31%42%
2364
21st to endDay
8%46%15%33%34%
2401
August1st to 10thDay
7%2410%29%47%
2135
11th to 20thDay
41212%36%45%
2122
21st to endDay
6%239%40%41%
2376
September1st to 10thDay
5%249%32%48%
2160
11th to 20thDay
6%1417%42%30%
2111
21st to endDay
7%1416%43%29%
1980
October1st to 10thDay
13%47%21%24%31%
1886
11th to 20thDay
15%36%15%33%29%
1800
21st to endDay
12%47%16%31%30%
1980
November1st to 10thDay
20%5%8%19%29%20%
1724
11th to 20thDay
20%410%19%27%21%
1710
21st to endDay
26%5%8%16%24%21%
1710
December1st to 10thDay
29%6%9%17%20%18%
1710
11th to 20thDay
35%11%13%16%15%10%
1928
21st to endDay
37%10%12%19%18%6%
2794
January1st to 10thNight
32%10%10%25%18%5%
4340
11th to 20thNight
29%13%13%21%15%9%
4110
21st to endNight
36%11%12%19%13%9%
4521
February1st to 10thNight
29%6%9%18%24%15%
2310
11th to 20thNight
23%7%10%25%25%11%
2219
21st to endNight
28%7%11%22%27%5%
1829
March1st to 10thNight
29%8%14%24%18%7%
2160
11th to 20thNight
28%9%13%22%21%7%
1996
21st to endNight
21%8%17%27%21%5%
2036
April1st to 10thNight
22%7%15%28%20%8%
1800
11th to 20thNight
18%5%13%26%29%9%
1779
21st to endNight
12%5%15%32%29%7%
1800
May1st to 10thNight
9%412%29%34%12%
1800
11th to 20thNight
10%48%30%35%13%
1631
21st to endNight
9%312%31%36%8%
1642
June1st to 10thNight
8%410%22%35%21%
1440
11th to 20thNight
326%17%37%35%
1440
21st to endNight
3137%36%51%
1440
July1st to 10thNight
3149%30%52%
1400
11th to 20thNight
5%25%15%27%47%
1469
21st to endNight
7%35%15%32%38%
1675
August1st to 10thNight
6%2310%30%50%
1780
11th to 20thNight
42211%34%46%
1780
21st to endNight
4129%40%43%
1980
September1st to 10thNight
6%2310%29%50%
1800
11th to 20thNight
6%2314%44%31%
1847
21st to endNight
6%2417%41%30%
1980
October1st to 10thNight
12%47%17%29%31%
2070
11th to 20thNight
14%47%18%31%26%
2160
21st to endNight
12%36%18%33%28%
2376
November1st to 10thNight
18%6%9%22%27%20%
2353
11th to 20thNight
19%5%11%18%26%21%
2470
21st to endNight
24%6%10%18%23%18%
2470
December1st to 10thNight
27%7%10%19%19%18%
2470
11th to 20thNight
36%11%12%17%16%9%
3271
21st to endNight
37%9%13%21%15%5%
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
14%12%27%33%11%2
218
11th to 20thDay
10%11%28%34%14%4
370
21st to endDay
11%12%29%29%16%3
407
February1st to 10thDay
9%13%28%28%15%6%
445
11th to 20thDay
9%14%27%32%15%3
455
21st to endDay
10%14%28%32%14%2
363
March1st to 10thDay
13%16%29%30%12%1
420
11th to 20thDay
9%15%29%31%14%2
420
21st to endDay
8%18%30%31%10%3
462
April1st to 10thDay
9%12%29%27%20%3
420
11th to 20thDay
6%15%31%30%16%3
412
21st to endDay
5%11%28%30%20%7%
420
May1st to 10thDay
7%9%30%28%20%6%
423
11th to 20thDay
49%23%36%21%7%
448
21st to endDay
5%10%22%35%22%6%
485
June1st to 10thDay
26%19%31%30%11%
450
11th to 20thDay
1417%38%30%10%
450
21st to endDay
211%35%37%16%
450
July1st to 10thDay
16%33%42%18%
446
11th to 20thDay
1329%39%27%
444
21st to endDay
11327%41%27%
487
August1st to 10thDay
219%36%34%19%
447
11th to 20thDay
2430%45%19%
437
21st to endDay
11432%43%20%
495
September1st to 10thDay
111%30%43%15%
450
11th to 20thDay
2214%40%34%8%
450
21st to endDay
1215%34%38%10%
450
October1st to 10thDay
1418%36%32%8%
450
11th to 20thDay
25%20%36%29%8%
450
21st to endDay
26%20%33%30%9%
495
November1st to 10thDay
5%7%19%33%27%8%
320
11th to 20thDay
47%18%35%29%6%
270
21st to endDay
6%10%18%35%27%4
270
December1st to 10thDay
6%6%26%38%23%2
270
11th to 20thDay
7%14%16%32%21%10%
180
21st to endDay
14%12%28%29%12%6%
198
January1st to 10thNight
11%6%14%36%21%11%
760
11th to 20thNight
6%414%43%25%8%
760
21st to endNight
10%6%15%42%21%6%
836
February1st to 10thNight
8%7%16%39%23%7%
760
11th to 20thNight
6%6%17%41%22%8%
744
21st to endNight
8%8%18%43%20%4
610
March1st to 10thNight
8%7%18%43%23%3
720
11th to 20thNight
7%6%15%38%29%6%
720
21st to endNight
6%7%18%39%26%3
792
April1st to 10thNight
5%6%16%44%25%4
720
11th to 20thNight
5%5%17%40%29%5%
711
21st to endNight
35%17%37%32%7%
720
May1st to 10thNight
2413%42%33%6%
720
11th to 20thNight
3313%37%39%5%
567
21st to endNight
15%15%40%35%4
480
June1st to 10thNight
119%34%51%4
360
11th to 20thNight
7%35%54%4
360
21st to endNight
1430%56%9%
360
July1st to 10thNight
116%74%9%
350
11th to 20thNight
15%65%19%
425
21st to endNight
11112%64%22%
592
August1st to 10thNight
1223%60%13%
716
11th to 20thNight
117%65%16%
712
21st to endNight
1118%64%16%
792
September1st to 10thNight
11223%59%14%
720
11th to 20thNight
15%30%50%13%
720
21st to endNight
116%30%53%9%
720
October1st to 10thNight
219%38%44%7%
720
11th to 20thNight
328%39%38%11%
720
21st to endNight
3110%39%38%10%
792
November1st to 10thNight
4312%38%32%11%
740
11th to 20thNight
4112%43%31%9%
760
21st to endNight
6%415%40%26%9%
760
December1st to 10thNight
7%414%41%28%6%
760
11th to 20thNight
10%415%44%21%5%
760
21st to endNight
8%8%18%39%20%7%
836
Page generated at 2024-02-22 03:05:41. Version ac07

Copyright 2024 Attilla Danko


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