Bodie
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bodie clear sky chart from 2005-11-05 to 2018-10-27.

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
68%
16712
31%
51252
27%
16686
74%
16686
49%
24749

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 15thNight
66%
776
25%
2716
24%
776
72%
776
39%
1342
January16th to endNight
64%
832
28%
2749
27%
832
70%
832
39%
1408
February1st to 15thNight
64%
757
30%
2356
29%
757
70%
757
43%
1199
February16th to endNight
59%
684
29%
2051
26%
684
67%
684
44%
1062
March1st to 15thNight
61%
780
25%
2340
21%
780
69%
780
46%
1183
March16th to endNight
54%
832
25%
2158
14%
832
62%
832
46%
1190
April1st to 15thNight
56%
779
25%
1949
12%
779
62%
779
42%
1121
April16th to endNight
58%
772
27%
1930
13%
772
62%
772
48%
1059
May1st to 15thNight
57%
618
30%
1788
21%
618
61%
618
47%
916
May16th to endNight
62%
453
25%
1672
24%
453
68%
453
37%
803
June1st to 15thNight
73%
390
30%
1560
34%
390
80%
390
45%
649
June16th to endNight
84%
390
35%
1560
42%
390
91%
390
67%
515
July1st to 15thNight
89%
370
33%
1480
42%
370
90%
370
58%
547
July16th to endNight
83%
431
34%
1566
40%
408
84%
408
48%
665
August1st to 15thNight
80%
716
35%
1862
24%
713
81%
713
66%
887
August16th to endNight
82%
828
40%
2070
25%
828
83%
828
72%
984
September1st to 15thNight
81%
780
42%
1950
28%
780
84%
780
70%
934
September16th to endNight
78%
776
42%
2132
35%
776
83%
776
65%
976
October1st to 15thNight
73%
780
34%
2260
32%
780
79%
780
55%
1090
October16th to endNight
76%
816
40%
2499
39%
816
83%
816
60%
1079
November1st to 15thNight
73%
760
33%
2470
32%
760
80%
760
53%
1106
November16th to endNight
65%
780
35%
2535
31%
780
74%
780
49%
1156
December1st to 15thNight
62%
780
24%
2687
22%
780
69%
780
40%
1315
December16th to endNight
56%
832
27%
2912
24%
832
64%
832
32%
1563

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
231332345%7%62%
52318
Night
1213323347%65%
51426
TransparencyDay
21%5%9%20%25%18%
51992
Night
18%411%24%26%14%
51253
SeeingDay
8%15%26%26%17%5%
7200
Night
35%17%37%28%8%
16725

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 15thDay
2133236%7%9%58%
1552
16th to endDay
24144246%6%8%53%
1823
February1st to 15thDay
31432445%9%59%
1836
16th to endDay
2244345%6%9%55%
1709
March1st to 15thDay
215%3335%7%10%56%
1950
16th to endDay
313425%5%7%10%55%
2416
April1st to 15thDay
2225%5%35%45%7%54%
2329
16th to endDay
1314324446%63%
2305
May1st to 15thDay
341433335%6%59%
2490
16th to endDay
48%25%43445%6%50%
2790
June1st to 15thDay
321342345%6%62%
2730
16th to endDay
211111322476%
2730
July1st to 15thDay
4313323346%62%
2730
16th to endDay
5%324424345%59%
2855
August1st to 15thDay
221332334468%
2342
16th to endDay
321231223373%
2484
September1st to 15thDay
221322233371%
2340
16th to endDay
1112211335%74%
2158
October1st to 15thDay
3212413335%67%
2028
16th to endDay
2212212337%70%
1981
November1st to 15thDay
1114323347%65%
1719
16th to endDay
123234411%63%
1755
December1st to 15thDay
21332346%8%60%
1602
16th to endDay
1245%35%6%7%10%50%
1664
January1st to 15thNight
13244345%5%8%57%
2716
16th to endNight
14144235%6%8%57%
2749
February1st to 15thNight
22433445%9%58%
2345
16th to endNight
42432435%8%59%
2051
March1st to 15thNight
31332435%10%60%
2340
16th to endNight
32431445%8%60%
2158
April1st to 15thNight
1314335%45%9%57%
1949
16th to endNight
141332224467%
1930
May1st to 15thNight
2413223446%63%
1788
16th to endNight
45%13223346%61%
1671
June1st to 15thNight
3213123346%67%
1560
16th to endNight
1111211285%
1560
July1st to 15thNight
111121235%5%73%
1560
16th to endNight
321332234468%
1663
August1st to 15thNight
111221123377%
1871
16th to endNight
11121123478%
2070
September1st to 15thNight
12121123478%
1950
16th to endNight
122111225%77%
2132
October1st to 15thNight
2213213335%70%
2260
16th to endNight
112312236%73%
2499
November1st to 15thNight
1211213348%70%
2470
16th to endNight
213323348%66%
2535
December1st to 15thNight
31333347%9%59%
2687
16th to endNight
225%5%35%5%7%10%50%
2912

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 15thDay
19%7%18%28%21%5%
1552
16th to endDay
26%8%14%20%20%10%
1823
February1st to 15thDay
21%5%14%27%22%8%
1836
16th to endDay
23%6%12%28%24%3
1709
March1st to 15thDay
19%7%18%26%21%7%
1950
16th to endDay
21%7%19%28%17%4
2416
April1st to 15thDay
26%7%13%25%20%6%
2329
16th to endDay
21%5%13%28%24%6%
2305
May1st to 15thDay
24%49%29%25%6%
2490
16th to endDay
33%6%9%20%23%7%
2794
June1st to 15thDay
23%47%17%31%16%
2730
16th to endDay
13%239%33%38%
2730
July1st to 15thDay
23%339%19%40%
2581
16th to endDay
26%35%9%18%36%
2690
August1st to 15thDay
19%3311%18%43%
2326
16th to endDay
16%228%30%39%
2484
September1st to 15thDay
17%3310%27%36%
2340
16th to endDay
13%2319%35%26%
2158
October1st to 15thDay
19%35%20%31%19%
2028
16th to endDay
15%35%23%37%15%
1981
November1st to 15thDay
19%411%26%27%11%
1719
16th to endDay
15%5%13%27%29%7%
1755
December1st to 15thDay
19%7%15%28%20%8%
1602
16th to endDay
24%10%16%22%19%6%
1664
January1st to 15thNight
22%5%15%26%22%5%
2716
16th to endNight
22%7%13%24%20%10%
2749
February1st to 15thNight
21%5%12%28%22%9%
2356
16th to endNight
21%5%14%30%23%4
2051
March1st to 15thNight
19%6%17%27%21%7%
2340
16th to endNight
21%5%19%29%19%4
2158
April1st to 15thNight
22%6%14%29%22%3
1949
16th to endNight
20%413%33%22%5%
1930
May1st to 15thNight
20%5%10%32%25%6%
1789
16th to endNight
24%5%11%27%26%6%
1672
June1st to 15thNight
16%5%7%21%33%14%
1560
16th to endNight
8%2215%37%34%
1560
July1st to 15thNight
13%25%12%28%38%
1480
16th to endNight
19%25%13%21%37%
1566
August1st to 15thNight
12%25%13%22%43%
1862
16th to endNight
10%1313%35%34%
2070
September1st to 15thNight
11%25%14%33%33%
1950
16th to endNight
12%2419%33%27%
2132
October1st to 15thNight
17%37%24%33%13%
2260
16th to endNight
11%37%25%38%13%
2499
November1st to 15thNight
14%6%11%30%27%10%
2470
16th to endNight
16%412%29%30%7%
2535
December1st to 15thNight
20%7%17%24%23%6%
2687
16th to endNight
26%8%13%23%21%6%
2912

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 15thDay
16%10%22%31%12%7%
90
16th to endDay
5%14%22%29%21%5%
255
February1st to 15thDay
411%19%33%20%9%
311
16th to endDay
6%15%28%28%17%3
290
March1st to 15thDay
6%15%24%28%16%7%
330
16th to endDay
8%24%29%24%12%
352
April1st to 15thDay
11%26%27%18%12%3
329
16th to endDay
11%27%28%18%8%3
318
May1st to 15thDay
14%19%33%16%10%4
348
16th to endDay
16%17%24%19%17%4
394
June1st to 15thDay
9%20%27%22%13%5%
375
16th to endDay
5%16%31%25%15%5%
375
July1st to 15thDay
7%9%26%28%21%6%
365
16th to endDay
9%8%23%31%17%8%
391
August1st to 15thDay
8%12%27%26%18%6%
359
16th to endDay
7%6%28%26%23%7%
396
September1st to 15thDay
8%10%28%32%16%4
375
16th to endDay
7%12%22%31%20%5%
375
October1st to 15thDay
8%18%31%25%12%4
375
16th to endDay
6%12%23%25%22%8%
331
November1st to 15thDay
15%21%28%24%19%
135
16th to endDay
5%21%14%25%28%4
135
December1st to 15thDay
9%13%26%27%17%8%
100
16th to endDay
6%8%17%34%25%8%
96
January1st to 15thNight
26%17%36%23%12%
780
16th to endNight
4419%39%22%10%
832
February1st to 15thNight
25%20%37%26%8%
764
16th to endNight
28%23%39%19%6%
684
March1st to 15thNight
36%22%38%20%8%
780
16th to endNight
210%28%34%20%5%
832
April1st to 15thNight
410%22%38%19%3
779
16th to endNight
410%21%32%22%7%
772
May1st to 15thNight
47%25%33%23%5%
619
16th to endNight
9%5%18%33%30%4
454
June1st to 15thNight
5%314%44%30%3
390
16th to endNight
111%53%30%3
390
July1st to 15thNight
2444%42%5%
370
16th to endNight
25%39%45%6%
431
August1st to 15thNight
3110%36%40%7%
716
16th to endNight
219%32%44%9%
828
September1st to 15thNight
319%34%42%9%
780
16th to endNight
2311%33%36%11%
776
October1st to 15thNight
4413%39%28%9%
780
16th to endNight
2412%31%33%15%
816
November1st to 15thNight
2316%41%27%9%
760
16th to endNight
37%18%35%26%8%
780
December1st to 15thNight
35%22%39%19%8%
780
16th to endNight
27%24%39%20%4
832
Page generated at 2018-10-28 05:41:00. Version ac04

Copyright 2018 A. Danko


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