Yerington
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Yerington clear sky chart from 2005-11-06 to 2024-03-08.

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
67%
23579
29%
80312
26%
23507
72%
23507
42%
40255

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
59%
749
22%
4344
20%
736
68%
736
23%
2019
January11th to 20thNight
63%
753
20%
4342
22%
740
70%
740
19%
2427
January21st to endNight
62%
828
17%
4372
26%
814
66%
814
20%
2448
February1st to 10thNight
61%
760
26%
2409
24%
760
67%
760
38%
1311
February11th to 20thNight
60%
740
30%
2219
27%
740
67%
740
41%
1197
February21st to endNight
55%
628
26%
1884
22%
628
62%
628
42%
1017
March1st to 10thNight
52%
750
23%
2249
18%
750
59%
750
34%
1290
March11th to 20thNight
60%
720
26%
2064
22%
720
66%
720
43%
1115
March21st to endNight
54%
792
24%
2003
14%
792
61%
792
45%
1157
April1st to 10thNight
57%
720
27%
1800
14%
720
62%
720
43%
1049
April11th to 20thNight
56%
711
29%
1779
13%
711
61%
711
47%
1004
April21st to endNight
57%
720
27%
1800
14%
720
61%
720
47%
1020
May1st to 10thNight
55%
572
30%
1652
20%
572
60%
572
44%
864
May11th to 20thNight
59%
462
30%
1525
27%
462
63%
462
45%
732
May21st to endNight
66%
388
24%
1552
26%
388
71%
388
34%
760
June1st to 10thNight
71%
360
29%
1440
35%
360
76%
360
43%
622
June11th to 20thNight
73%
360
35%
1440
40%
360
83%
360
58%
513
June21st to endNight
82%
360
34%
1440
41%
360
88%
360
62%
508
July1st to 10thNight
86%
350
35%
1400
45%
350
90%
350
66%
471
July11th to 20thNight
83%
348
34%
1392
42%
348
87%
348
56%
511
July21st to endNight
84%
398
37%
1492
45%
376
86%
376
48%
615
August1st to 10thNight
79%
612
34%
1677
25%
609
82%
609
59%
823
August11th to 20thNight
79%
712
36%
1780
22%
712
80%
712
72%
845
August21st to endNight
82%
792
42%
1980
26%
792
83%
792
77%
908
September1st to 10thNight
81%
720
43%
1800
28%
720
84%
720
75%
830
September11th to 20thNight
78%
720
41%
1862
31%
720
82%
720
66%
906
September21st to endNight
78%
720
42%
1980
36%
720
83%
720
65%
923
October1st to 10thNight
75%
720
34%
2067
31%
720
81%
720
54%
1021
October11th to 20thNight
77%
720
40%
2160
39%
720
84%
720
65%
933
October21st to endNight
76%
792
41%
2460
41%
792
83%
792
61%
1070
November1st to 10thNight
72%
740
33%
2405
34%
740
78%
740
51%
1109
November11th to 20thNight
73%
760
33%
2470
32%
760
79%
760
52%
1140
November21st to endNight
69%
760
33%
2470
31%
760
76%
760
45%
1210
December1st to 10thNight
60%
760
22%
2650
20%
760
66%
760
36%
1383
December11th to 20thNight
61%
758
21%
3184
22%
758
65%
758
25%
1834
December21st to endNight
53%
824
14%
4769
20%
817
61%
817
17%
2670

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
342442445%7%62%
78625
Night
35%2442445%7%61%
80966
TransparencyDay
21%5%10%21%23%20%
78330
Night
22%6%11%24%22%15%
80783
SeeingDay
6%11%23%31%21%8%
14079
Night
5%319%42%26%5%
23624

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%37%7%45%5%6%9%48%
2539
11th to 20thDay
5%7%37%5%345%6%9%47%
2540
21st to endDay
5%9%36%7%35%6%7%8%41%
3146
February1st to 10thDay
35%244245%6%10%56%
1770
11th to 20thDay
25%45%435%45%10%54%
1850
21st to endDay
1436%43446%8%57%
1570
March1st to 10thDay
37%35%6%45%5%6%9%49%
1871
11th to 20thDay
35%344446%7%10%51%
1894
21st to endDay
3425%435%46%9%56%
2353
April1st to 10thDay
45%245%25%45%7%56%
2160
11th to 20thDay
45%3343335%8%60%
2129
21st to endDay
442332345%6%64%
2160
May1st to 10thDay
441332345%7%64%
2306
11th to 20thDay
5%42443345%7%59%
2365
21st to endDay
6%5%245%25%5%5%7%55%
2723
June1st to 10thDay
331333445%7%64%
2520
11th to 20thDay
222223346%74%
2520
21st to endDay
311232333476%
2520
July1st to 10thDay
221322434473%
2520
11th to 20thDay
2212323446%70%
2520
21st to endDay
2214325%45%5%66%
2733
August1st to 10thDay
3313324445%68%
2251
11th to 20thDay
111323345%79%
2122
21st to endDay
211221222481%
2376
September1st to 10thDay
211221223480%
2160
11th to 20thDay
2212213245%77%
2098
21st to endDay
2212212235%79%
1980
October1st to 10thDay
421342334471%
1890
11th to 20thDay
2211222336%76%
1800
21st to endDay
2212323346%72%
1895
November1st to 10thDay
342322445%8%63%
1674
11th to 20thDay
22223135%6%9%66%
1710
21st to endDay
3333335%35%8%61%
1710
December1st to 10thDay
35%24425%46%8%57%
1528
11th to 20thDay
36%37%6%5%8%7%8%9%38%
1928
21st to endDay
37%36%6%45%6%7%10%42%
2794
January1st to 10thNight
36%36%42446%7%54%
4406
11th to 20thNight
39%48%6%35%5%5%6%46%
4417
21st to endNight
5%8%37%5%35%5%6%8%45%
4521
February1st to 10thNight
37%34435%46%7%55%
2409
11th to 20thNight
25%24425%46%8%57%
2218
21st to endNight
25%25%4345%5%8%56%
1884
March1st to 10thNight
47%35%5%345%7%7%50%
2249
11th to 20thNight
25%335%345%7%9%56%
2064
21st to endNight
36%144245%6%8%58%
2003
April1st to 10thNight
45%234345%48%58%
1800
11th to 20thNight
34233235%48%64%
1779
21st to endNight
6%5%24323347%62%
1800
May1st to 10thNight
5%424433446%63%
1652
11th to 20thNight
7%42232235%6%62%
1524
21st to endNight
7%5%15%3245%5%7%56%
1552
June1st to 10thNight
4413224347%66%
1440
11th to 20thNight
2112223236%77%
1440
21st to endNight
221221333479%
1440
July1st to 10thNight
111222345%79%
1440
11th to 20thNight
1223224345%72%
1440
21st to endNight
322333445%6%67%
1580
August1st to 10thNight
321332434470%
1686
11th to 20thNight
221222233477%
1780
21st to endNight
211112235%81%
1980
September1st to 10thNight
211221222482%
1800
11th to 20thNight
2213322335%75%
1862
21st to endNight
3212212335%76%
1980
October1st to 10thNight
431332333471%
2067
11th to 20thNight
2212212336%76%
2160
21st to endNight
322312335%75%
2460
November1st to 10thNight
332322245%6%68%
2405
11th to 20thNight
2422323347%67%
2470
21st to endNight
3324323448%62%
2470
December1st to 10thNight
45%25%5%24448%57%
2650
11th to 20thNight
47%26%5%46%5%7%10%43%
3276
21st to endNight
48%37%6%46%6%8%10%39%
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
26%10%19%34%10%1
2539
11th to 20thDay
31%9%16%29%13%1
2540
21st to endDay
36%10%15%26%12%1
3146
February1st to 10thDay
24%6%14%29%19%8%
1770
11th to 20thDay
27%5%11%30%22%6%
1860
21st to endDay
24%5%15%32%20%5%
1570
March1st to 10thDay
30%7%12%29%18%4
1871
11th to 20thDay
26%6%15%24%22%8%
1894
21st to endDay
25%6%19%29%18%4
2353
April1st to 10thDay
27%6%11%23%23%10%
2160
11th to 20thDay
23%5%11%24%26%11%
2132
21st to endDay
21%410%29%28%8%
2160
May1st to 10thDay
20%49%24%32%11%
2306
11th to 20thDay
24%5%8%23%28%11%
2368
21st to endDay
28%7%10%20%26%9%
2724
June1st to 10thDay
20%5%7%18%30%19%
2520
11th to 20thDay
12%46%18%30%30%
2520
21st to endDay
13%349%25%47%
2520
July1st to 10thDay
14%3411%19%49%
2451
11th to 20thDay
14%3411%19%47%
2445
21st to endDay
18%5%5%10%19%43%
2581
August1st to 10thDay
17%4412%18%45%
2235
11th to 20thDay
9%348%25%51%
2122
21st to endDay
11%229%26%51%
2376
September1st to 10thDay
10%238%25%51%
2160
11th to 20thDay
12%45%15%32%33%
2098
21st to endDay
12%2317%33%34%
1980
October1st to 10thDay
18%37%17%30%25%
1890
11th to 20thDay
12%26%22%37%21%
1800
21st to endDay
13%46%28%35%14%
1895
November1st to 10thDay
19%5%12%25%31%9%
1674
11th to 20thDay
15%5%16%27%31%5%
1710
21st to endDay
22%413%28%28%5%
1710
December1st to 10thDay
23%8%15%29%22%3
1528
11th to 20thDay
37%11%14%24%11%2
1928
21st to endDay
33%9%23%25%10%1
2794
January1st to 10thNight
27%8%22%32%11%1
4406
11th to 20thNight
34%10%15%26%12%2
4417
21st to endNight
33%9%17%28%12%
4521
February1st to 10thNight
28%5%14%28%18%6%
2409
11th to 20thNight
25%6%11%34%20%4
2219
21st to endNight
23%7%15%32%17%5%
1884
March1st to 10thNight
30%6%13%25%21%5%
2249
11th to 20thNight
24%5%14%27%22%7%
2064
21st to endNight
24%6%17%28%19%5%
2003
April1st to 10thNight
26%5%14%28%19%8%
1800
11th to 20thNight
21%6%11%28%23%11%
1779
21st to endNight
23%5%10%28%29%5%
1800
May1st to 10thNight
23%48%21%34%9%
1652
11th to 20thNight
23%38%25%31%10%
1525
21st to endNight
26%6%12%22%25%8%
1552
June1st to 10thNight
19%5%7%20%30%19%
1440
11th to 20thNight
10%46%16%33%31%
1440
21st to endNight
11%2413%28%42%
1440
July1st to 10thNight
9%2311%25%49%
1400
11th to 20thNight
13%35%12%20%47%
1392
21st to endNight
18%35%12%20%42%
1492
August1st to 10thNight
16%45%15%19%42%
1677
11th to 20thNight
11%25%10%27%46%
1780
21st to endNight
9%1410%27%49%
1980
September1st to 10thNight
9%239%28%49%
1800
11th to 20thNight
13%36%16%29%34%
1862
21st to endNight
14%2413%32%34%
1980
October1st to 10thNight
19%36%17%29%26%
2067
11th to 20thNight
12%37%22%35%22%
2160
21st to endNight
12%46%25%37%16%
2460
November1st to 10thNight
17%5%10%29%27%12%
2405
11th to 20thNight
17%5%12%31%30%6%
2470
21st to endNight
22%410%30%29%5%
2470
December1st to 10thNight
26%7%14%28%21%4
2650
11th to 20thNight
32%10%17%25%14%2
3276
21st to endNight
34%11%16%25%12%2
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
8%8%27%36%17%4
180
11th to 20thDay
37%24%37%22%6%
180
21st to endDay
7%7%21%33%26%6%
407
February1st to 10thDay
5%15%22%35%17%7%
399
11th to 20thDay
8%12%24%35%19%2
455
21st to endDay
6%15%27%35%15%2
382
March1st to 10thDay
12%15%24%32%14%3
449
11th to 20thDay
7%16%29%30%14%5%
420
21st to endDay
10%18%26%30%15%2
462
April1st to 10thDay
10%17%28%27%14%4
420
11th to 20thDay
11%19%24%29%12%5%
412
21st to endDay
9%17%28%24%16%7%
420
May1st to 10thDay
10%17%26%27%14%6%
423
11th to 20thDay
11%16%25%26%15%6%
448
21st to endDay
10%13%20%28%20%10%
485
June1st to 10thDay
5%15%24%26%21%10%
450
11th to 20thDay
7%12%27%28%20%7%
450
21st to endDay
39%24%31%25%9%
450
July1st to 10thDay
27%23%32%23%12%
446
11th to 20thDay
35%20%32%29%11%
444
21st to endDay
3420%32%29%12%
487
August1st to 10thDay
48%21%31%23%13%
447
11th to 20thDay
17%25%29%23%15%
437
21st to endDay
25%23%33%27%10%
495
September1st to 10thDay
35%20%32%27%13%
450
11th to 20thDay
39%22%35%24%8%
450
21st to endDay
27%22%38%25%6%
450
October1st to 10thDay
49%23%30%26%8%
450
11th to 20thDay
48%18%34%28%8%
450
21st to endDay
5%7%18%34%27%9%
410
November1st to 10thDay
47%20%31%27%11%
270
11th to 20thDay
2418%35%27%14%
270
21st to endDay
36%19%34%30%9%
270
December1st to 10thDay
5%7%19%33%24%12%
183
11th to 20thDay
5%7%22%36%22%8%
180
21st to endDay
10%7%22%33%19%8%
198
January1st to 10thNight
6%423%40%20%9%
760
11th to 20thNight
3421%43%23%6%
760
21st to endNight
6%219%45%21%7%
836
February1st to 10thNight
5%423%42%23%4
760
11th to 20thNight
3425%41%22%4
744
21st to endNight
4329%45%15%3
628
March1st to 10thNight
8%6%27%39%18%3
750
11th to 20thNight
37%24%40%22%5%
720
21st to endNight
6%5%30%41%16%2
792
April1st to 10thNight
6%8%23%40%20%2
720
11th to 20thNight
7%8%26%36%19%4
711
21st to endNight
7%8%24%37%21%4
720
May1st to 10thNight
7%8%26%39%18%2
572
11th to 20thNight
8%425%38%24%1
462
21st to endNight
9%318%42%26%3
389
June1st to 10thNight
6%217%45%28%2
360
11th to 20thNight
2219%48%27%2
360
21st to endNight
3111%56%28%2
360
July1st to 10thNight
219%54%33%1
350
11th to 20thNight
219%55%32%1
348
21st to endNight
325%52%37%1
398
August1st to 10thNight
4110%43%39%3
612
11th to 20thNight
2213%45%34%4
712
21st to endNight
2112%45%37%3
792
September1st to 10thNight
2211%38%41%6%
720
11th to 20thNight
3213%39%37%6%
720
21st to endNight
4213%37%37%7%
720
October1st to 10thNight
5%314%43%28%8%
720
11th to 20thNight
3214%39%36%6%
720
21st to endNight
4314%38%30%13%
792
November1st to 10thNight
4217%41%27%10%
740
11th to 20thNight
4316%45%25%7%
760
21st to endNight
4316%45%27%5%
760
December1st to 10thNight
6%222%42%21%6%
760
11th to 20thNight
8%221%44%20%6%
760
21st to endNight
7%425%44%16%2
836
Page generated at 2024-03-05 04:24:00. Version ac07

Copyright © 2024 Attilla Danko.


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