Lagniappe Farm
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lagniappe Farm clear sky chart from 2005-11-06 to 2024-12-02.

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
40%
24669
19%
97205
13%
24407
50%
24407
21%
59183

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
25%
753
27%
4023
9%
737
43%
737
17%
2063
January11th to 20thNight
28%
760
28%
3936
12%
740
44%
740
15%
2156
January21st to endNight
26%
831
17%
4439
11%
814
44%
814
15%
2672
February1st to 10thNight
30%
760
20%
2470
11%
760
42%
760
23%
1557
February11th to 20thNight
17%
740
20%
2396
7%
740
34%
740
20%
1520
February21st to endNight
21%
628
24%
1834
9%
628
38%
628
24%
1188
March1st to 10thNight
26%
758
21%
3403
10%
745
41%
745
16%
2203
March11th to 20thNight
25%
756
27%
3410
10%
740
36%
740
20%
1644
March21st to endNight
27%
832
13%
3672
8%
814
37%
814
18%
2046
April1st to 10thNight
27%
760
21%
1919
5%
760
37%
760
29%
1268
April11th to 20thNight
34%
751
22%
1875
8%
751
41%
751
34%
1202
April21st to endNight
36%
760
21%
1900
8%
760
42%
760
32%
1262
May1st to 10thNight
36%
572
15%
2803
8%
567
43%
567
14%
1894
May11th to 20thNight
41%
551
11%
2789
8%
541
47%
541
13%
1879
May21st to endNight
54%
421
14%
2729
15%
417
58%
417
16%
1418
June1st to 10thNight
60%
380
19%
1520
21%
380
66%
380
26%
864
June11th to 20thNight
60%
380
15%
1520
17%
380
63%
380
22%
922
June21st to endNight
60%
380
17%
1520
19%
380
66%
380
25%
890
July1st to 10thNight
60%
414
14%
2541
16%
412
63%
412
15%
1411
July11th to 20thNight
70%
539
10%
2645
12%
533
71%
533
18%
1680
July21st to endNight
65%
611
10%
2908
12%
569
68%
569
16%
1936
August1st to 10thNight
62%
558
14%
2663
13%
545
64%
545
16%
1799
August11th to 20thNight
59%
587
14%
2641
13%
582
61%
582
16%
1787
August21st to endNight
62%
818
13%
3072
10%
814
63%
814
20%
1949
September1st to 10thNight
61%
760
23%
1900
15%
760
64%
760
32%
1286
September11th to 20thNight
59%
760
27%
1946
21%
760
61%
760
33%
1261
September21st to endNight
45%
760
18%
2171
15%
760
49%
760
23%
1476
October1st to 10thNight
48%
760
15%
3055
21%
740
53%
740
18%
2148
October11th to 20thNight
46%
760
22%
2521
19%
740
57%
740
26%
1538
October21st to endNight
43%
836
27%
2579
20%
814
54%
814
31%
1531
November1st to 10thNight
43%
780
29%
2341
19%
780
56%
780
33%
1368
November11th to 20thNight
34%
800
24%
2641
14%
800
48%
800
27%
1545
November21st to endNight
38%
800
25%
2800
16%
800
52%
800
29%
1568
December1st to 10thNight
29%
768
22%
2686
10%
768
44%
768
22%
1679
December11th to 20thNight
34%
759
23%
3168
14%
759
48%
759
21%
1856
December21st to endNight
33%
826
15%
4769
13%
817
46%
817
13%
2717

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
14%6%26%445%46%8%42%
101291
Night
15%6%26%44445%7%43%
98292
TransparencyDay
38%7%13%22%16%4
104939
Night
38%7%12%22%18%4
102783
SeeingDay
18%11%26%26%14%5%
15101
Night
17%8%28%32%14%1
24812

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
18%6%25%34435%5%48%
2808
11th to 20thDay
14%9%37%445%445%42%
2840
21st to endDay
18%9%36%444346%39%
3124
February1st to 10thDay
12%8%37%6%5%436%6%42%
1710
11th to 20thDay
18%7%26%343346%43%
1671
21st to endDay
18%8%36%445%35%7%38%
1617
March1st to 10thDay
20%8%26%5%43346%38%
3435
11th to 20thDay
9%5%25%34445%7%51%
3480
21st to endDay
21%7%36%5%3435%6%38%
3815
April1st to 10thDay
12%5%15%44446%7%48%
2261
11th to 20thDay
12%7%25%44335%7%48%
2254
21st to endDay
16%7%26%5%4445%6%41%
2289
May1st to 10thDay
18%8%27%5%5%5%46%8%32%
4082
11th to 20thDay
23%6%26%445%46%8%34%
4081
21st to endDay
11%425%45%5%5%7%11%42%
4788
June1st to 10thDay
11%4246%5%5%47%9%42%
2660
11th to 20thDay
10%5%26%5%45%5%7%9%41%
2660
21st to endDay
9%425%45%5%5%7%9%45%
2660
July1st to 10thDay
6%426%5%5%6%5%8%11%41%
4324
11th to 20thDay
9%5%25%5%5%6%6%8%13%36%
4120
21st to endDay
11%7%37%6%6%6%5%7%9%33%
4466
August1st to 10thDay
14%6%26%5%5%6%5%8%11%33%
4104
11th to 20thDay
9%5%27%5%6%6%5%8%10%38%
3932
21st to endDay
10%425%35%446%8%49%
4180
September1st to 10thDay
13%5%26%44435%7%46%
2280
11th to 20thDay
13%5%26%34436%8%46%
2231
21st to endDay
22%7%26%435%45%5%36%
2009
October1st to 10thDay
15%6%25%344346%48%
1900
11th to 20thDay
16%424334336%52%
1900
21st to endDay
13%5%25%334336%53%
2090
November1st to 10thDay
12%6%15%43335%6%54%
1957
11th to 20thDay
14%5%25%33445%5%50%
1753
21st to endDay
14%5%15%44235%6%51%
1600
December1st to 10thDay
15%7%26%34446%6%42%
1528
11th to 20thDay
16%6%24433246%50%
1910
21st to endDay
20%6%26%43445%7%37%
2772
January1st to 10thNight
14%7%25%33435%5%49%
4132
11th to 20thNight
18%7%24333345%48%
4120
21st to endNight
19%9%36%33324444%
4532
February1st to 10thNight
14%7%26%445%46%7%42%
2470
11th to 20thNight
20%7%26%333345%43%
2394
21st to endNight
16%7%36%44346%5%44%
1834
March1st to 10thNight
21%7%26%44435%6%38%
3418
11th to 20thNight
13%6%1433435%7%51%
3480
21st to endNight
14%7%25%444346%48%
3817
April1st to 10thNight
14%7%26%44435%7%45%
1919
11th to 20thNight
12%5%25%44435%8%48%
1875
21st to endNight
15%5%25%34345%8%45%
1900
May1st to 10thNight
21%8%37%5%4445%8%32%
2821
11th to 20thNight
25%6%26%45%445%6%32%
2812
21st to endNight
12%5%26%45%446%10%44%
2764
June1st to 10thNight
11%5%25%44448%10%44%
1520
11th to 20thNight
11%5%25%5%6%6%46%9%41%
1520
21st to endNight
9%425%5%46%5%7%9%43%
1520
July1st to 10thNight
7%427%5%5%6%6%8%11%41%
2631
11th to 20thNight
8%6%28%5%6%6%5%7%10%36%
2840
21st to endNight
10%7%38%6%5%6%5%8%9%32%
3087
August1st to 10thNight
15%6%27%6%6%5%47%9%33%
2825
11th to 20thNight
11%8%38%5%5%5%5%6%8%36%
2863
21st to endNight
11%6%26%5%4446%8%45%
3476
September1st to 10thNight
15%5%26%35%435%7%45%
1900
11th to 20thNight
12%7%36%44435%6%47%
1946
21st to endNight
23%6%25%443246%40%
2171
October1st to 10thNight
19%6%24433346%46%
2280
11th to 20thNight
16%5%2333435%6%50%
2280
21st to endNight
14%5%1443335%6%52%
2508
November1st to 10thNight
12%6%25%333345%53%
2341
11th to 20thNight
15%6%25%433346%49%
2641
21st to endNight
13%5%15%343347%51%
2800
December1st to 10thNight
16%7%26%5%4445%6%42%
2686
11th to 20thNight
17%6%35%43335%5%47%
3285
21st to endNight
17%6%26%445%46%7%40%
4884

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
37%410%30%14%5%
2809
11th to 20thDay
42%6%9%19%17%7%
2840
21st to endDay
45%6%10%21%15%3
3124
February1st to 10thDay
41%6%11%25%14%3
1710
11th to 20thDay
42%5%8%22%19%5%
1680
21st to endDay
45%6%12%15%17%5%
1617
March1st to 10thDay
46%7%9%18%14%6%
3435
11th to 20thDay
29%7%9%24%23%8%
3480
21st to endDay
46%7%10%18%15%4
3815
April1st to 10thDay
33%7%12%21%18%8%
2261
11th to 20thDay
35%6%12%20%22%6%
2254
21st to endDay
41%7%11%22%14%4
2289
May1st to 10thDay
46%11%13%18%10%2
4120
11th to 20thDay
45%10%14%19%10%1
4085
21st to endDay
31%12%16%21%19%2
4802
June1st to 10thDay
36%9%15%25%14%1
2660
11th to 20thDay
37%10%14%22%15%2
2660
21st to endDay
32%9%17%24%16%2
2660
July1st to 10thDay
33%10%21%19%11%6%
4257
11th to 20thDay
35%10%18%26%9%1
4051
21st to endDay
45%8%13%21%13%1
4324
August1st to 10thDay
43%8%18%24%6%
4091
11th to 20thDay
37%8%15%25%14%
3971
21st to endDay
32%6%18%28%14%2
4180
September1st to 10thDay
37%8%12%17%20%5%
2280
11th to 20thDay
35%7%10%26%19%4
2231
21st to endDay
47%7%10%18%15%3
2009
October1st to 10thDay
36%47%18%30%5%
3160
11th to 20thDay
25%47%23%30%11%
3140
21st to endDay
21%310%29%23%13%
3428
November1st to 10thDay
32%5%9%24%26%5%
1957
11th to 20thDay
34%6%10%21%23%7%
1753
21st to endDay
34%5%10%25%23%3
1600
December1st to 10thDay
41%6%13%22%13%4
1528
11th to 20thDay
36%48%31%14%6%
1906
21st to endDay
43%8%12%25%12%1
2772
January1st to 10thNight
34%5%10%24%21%5%
4132
11th to 20thNight
39%48%21%22%5%
4120
21st to endNight
44%47%23%18%3
4532
February1st to 10thNight
41%6%11%24%16%3
2470
11th to 20thNight
43%48%20%18%7%
2396
21st to endNight
41%5%10%21%17%6%
1834
March1st to 10thNight
44%8%10%20%15%3
3418
11th to 20thNight
29%7%9%21%28%6%
3480
21st to endNight
37%6%11%21%20%6%
3817
April1st to 10thNight
38%5%11%17%23%6%
1919
11th to 20thNight
33%7%12%21%21%6%
1875
21st to endNight
37%7%12%24%15%5%
1900
May1st to 10thNight
47%9%13%18%10%3
2848
11th to 20thNight
46%11%14%19%9%1
2813
21st to endNight
34%9%17%24%13%2
2771
June1st to 10thNight
32%10%15%27%15%1
1520
11th to 20thNight
36%11%16%22%13%1
1520
21st to endNight
32%11%16%19%18%3
1520
July1st to 10thNight
35%11%25%14%13%3
2588
11th to 20thNight
39%10%21%23%7%1
2786
21st to endNight
43%10%16%19%10%
2988
August1st to 10thNight
47%7%16%23%7%1
2814
11th to 20thNight
44%8%13%22%13%1
2890
21st to endNight
36%8%13%29%12%1
3476
September1st to 10thNight
38%7%12%21%15%7%
1900
11th to 20thNight
37%6%11%23%20%3
1946
21st to endNight
46%6%10%19%16%3
2171
October1st to 10thNight
41%5%9%19%20%6%
3800
11th to 20thNight
25%48%22%30%11%
3779
21st to endNight
21%38%31%26%10%
4120
November1st to 10thNight
33%5%10%22%24%6%
2341
11th to 20thNight
37%47%21%24%7%
2641
21st to endNight
34%410%24%22%6%
2800
December1st to 10thNight
42%6%10%23%15%4
2686
11th to 20thNight
39%5%9%22%20%6%
3288
21st to endNight
38%9%13%24%14%2
4884

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
27%19%32%17%5%
263
11th to 20thDay
26%26%29%15%3
270
21st to endDay
25%22%36%14%31
297
February1st to 10thDay
22%20%41%14%3
270
11th to 20thDay
36%24%28%11%
278
21st to endDay
29%18%29%21%3
382
March1st to 10thDay
23%16%35%20%5%
460
11th to 20thDay
21%21%32%20%5%1
460
21st to endDay
24%17%33%20%5%1
506
April1st to 10thDay
23%18%30%20%7%1
460
11th to 20thDay
18%16%31%21%10%4
452
21st to endDay
23%12%33%20%10%2
460
May1st to 10thDay
21%13%32%21%10%3
463
11th to 20thDay
21%11%29%24%11%3
487
21st to endDay
19%325%30%19%4
529
June1st to 10thDay
13%428%30%19%6%
490
11th to 20thDay
12%8%25%32%16%8%
490
21st to endDay
11%5%24%36%19%5%
490
July1st to 10thDay
12%416%33%27%9%
485
11th to 20thDay
6%316%37%27%11%
484
21st to endDay
10%419%34%22%10%
532
August1st to 10thDay
13%5%18%28%26%12%
486
11th to 20thDay
12%316%30%28%11%
479
21st to endDay
9%415%33%25%14%
539
September1st to 10thDay
15%5%17%27%21%16%
490
11th to 20thDay
15%317%32%24%10%
490
21st to endDay
30%7%22%25%11%5%
490
October1st to 10thDay
19%7%21%29%18%7%
490
11th to 20thDay
16%12%26%25%18%3
490
21st to endDay
15%11%33%29%9%3
539
November1st to 10thDay
16%9%31%28%12%3
495
11th to 20thDay
18%10%33%28%9%2
345
21st to endDay
19%16%35%23%7%1
200
December1st to 10thDay
20%18%39%16%6%1
182
11th to 20thDay
21%14%34%22%8%1
180
21st to endDay
23%18%35%17%6%1
198
January1st to 10thNight
19%14%38%25%4
760
11th to 20thNight
20%14%32%31%4
760
21st to endNight
18%13%39%27%3
836
February1st to 10thNight
18%10%39%31%3
760
11th to 20thNight
24%16%40%19%2
743
21st to endNight
21%13%41%22%2
628
March1st to 10thNight
18%16%36%27%4
760
11th to 20thNight
22%14%35%22%6%1
760
21st to endNight
18%14%36%27%5%
836
April1st to 10thNight
18%15%36%25%5%
760
11th to 20thNight
13%12%36%29%9%1
751
21st to endNight
17%9%34%33%7%
760
May1st to 10thNight
21%8%28%30%13%1
578
11th to 20thNight
20%427%34%15%1
561
21st to endNight
16%19%39%22%3
431
June1st to 10thNight
10%220%45%22%1
380
11th to 20thNight
11%218%42%25%2
380
21st to endNight
9%121%49%19%2
380
July1st to 10thNight
13%214%36%32%3
426
11th to 20thNight
6%212%40%36%5%
552
21st to endNight
8%115%41%30%4
624
August1st to 10thNight
12%211%40%31%3
567
11th to 20thNight
14%311%39%29%3
603
21st to endNight
13%311%37%32%4
836
September1st to 10thNight
16%214%35%28%5%
760
11th to 20thNight
13%415%35%29%3
760
21st to endNight
26%418%31%20%1
760
October1st to 10thNight
20%5%19%31%21%4
760
11th to 20thNight
18%7%25%34%16%1
760
21st to endNight
16%7%30%35%12%1
836
November1st to 10thNight
14%7%31%33%13%2
780
11th to 20thNight
18%9%33%32%8%
800
21st to endNight
14%8%36%31%10%1
800
December1st to 10thNight
19%10%36%27%8%
768
11th to 20thNight
18%8%36%34%6%
760
21st to endNight
19%9%32%37%3
836
Page generated at 2024-11-29 10:43:05. Version ac07

Copyright © 2024 Attilla Danko.


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