Dixon Ball Field
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dixon Ball Field clear sky chart from 2005-11-06 to 2024-01-13.

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
57%
24276
28%
74478
19%
24220
65%
24220
41%
39288

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
53%
869
28%
2567
19%
866
63%
866
45%
1342
January11th to 20thNight
52%
732
29%
2379
23%
732
62%
732
41%
1217
January21st to endNight
53%
792
30%
2574
24%
792
63%
792
41%
1329
February1st to 10thNight
47%
720
26%
2319
20%
720
57%
720
40%
1215
February11th to 20thNight
39%
702
25%
2098
15%
700
51%
700
37%
1187
February21st to endNight
38%
592
33%
1776
17%
592
54%
592
41%
951
March1st to 10thNight
42%
720
29%
2093
16%
720
54%
720
43%
1122
March11th to 20thNight
50%
720
28%
1980
17%
720
56%
720
42%
1121
March21st to endNight
41%
707
29%
2093
14%
707
55%
707
39%
1118
April1st to 10thNight
34%
540
30%
1800
14%
540
54%
540
41%
855
April11th to 20thNight
41%
533
26%
1777
17%
533
55%
533
35%
911
April21st to endNight
42%
540
28%
1800
16%
540
60%
540
39%
923
May1st to 10thNight
48%
540
28%
1800
19%
540
63%
540
42%
877
May11th to 20thNight
51%
531
22%
1607
16%
531
58%
531
33%
931
May21st to endNight
54%
584
30%
1552
16%
582
66%
582
51%
806
June1st to 10thNight
66%
540
27%
1440
18%
540
72%
540
51%
754
June11th to 20thNight
67%
540
31%
1440
22%
540
73%
540
59%
706
June21st to endNight
72%
540
24%
1440
18%
540
76%
540
46%
806
July1st to 10thNight
75%
525
18%
1400
16%
525
75%
525
33%
895
July11th to 20thNight
83%
522
17%
1517
15%
522
83%
522
35%
890
July21st to endNight
76%
591
12%
1674
12%
558
76%
558
25%
1088
August1st to 10thNight
80%
537
13%
1654
13%
534
81%
534
31%
988
August11th to 20thNight
72%
534
17%
1778
20%
534
73%
534
26%
1102
August21st to endNight
80%
594
22%
1980
25%
594
81%
594
35%
1090
September1st to 10thNight
75%
540
28%
1800
29%
540
78%
540
35%
994
September11th to 20thNight
78%
540
35%
1800
34%
540
83%
540
45%
882
September21st to endNight
68%
562
32%
1989
30%
562
74%
562
46%
914
October1st to 10thNight
62%
720
29%
2160
20%
720
69%
720
44%
1144
October11th to 20thNight
62%
720
40%
2160
22%
720
75%
720
61%
962
October21st to endNight
60%
792
38%
2376
23%
792
71%
792
53%
1119
November1st to 10thNight
64%
820
38%
2300
23%
820
73%
820
65%
1033
November11th to 20thNight
61%
950
38%
2470
21%
950
69%
950
65%
1187
November21st to endNight
55%
950
33%
2470
19%
950
63%
950
49%
1361
December1st to 10thNight
51%
950
31%
2636
18%
950
59%
950
43%
1446
December11th to 20thNight
50%
948
25%
3124
17%
948
56%
948
33%
1769
December21st to endNight
43%
1039
16%
4655
15%
1026
51%
1026
27%
2253

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
34234245%6%8%60%
74720
Night
45%2442445%7%60%
75042
TransparencyDay
22%8%14%22%24%11%
74439
Night
22%7%13%22%25%10%
74845
SeeingDay
6%12%27%32%19%4
14066
Night
5%5%28%42%18%1
24287

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
26%2332245%7%63%
1613
11th to 20thDay
46%23313435%66%
1642
21st to endDay
45%23424347%63%
1782
February1st to 10thDay
16%25%434448%60%
1638
11th to 20thDay
26%36%4235%5%7%58%
1749
21st to endDay
28%244235%6%7%56%
1480
March1st to 10thDay
35%2442446%8%57%
1863
11th to 20thDay
35%25%5%3435%7%57%
1980
21st to endDay
4434435%36%7%58%
2263
April1st to 10thDay
342342345%8%63%
2160
11th to 20thDay
3424425%45%7%60%
2131
21st to endDay
441342345%9%61%
2160
May1st to 10thDay
431333346%7%63%
2160
11th to 20thDay
33235%36%46%8%57%
2283
21st to endDay
231232445%8%65%
2724
June1st to 10thDay
2112325%7%7%9%63%
2520
11th to 20thDay
111222346%7%71%
2520
21st to endDay
42133245%8%9%58%
2520
July1st to 10thDay
33145%36%7%9%10%50%
2520
11th to 20thDay
22135%46%8%10%12%47%
2388
21st to endDay
4425%7%5%7%10%10%12%35%
2545
August1st to 10thDay
33246%36%8%9%11%45%
2275
11th to 20thDay
3225%447%5%7%10%51%
2123
21st to endDay
3323435%6%9%11%51%
2376
September1st to 10thDay
5%323435%6%6%9%54%
2160
11th to 20thDay
5%3144245%6%7%61%
2160
21st to endDay
411232345%6%70%
1966
October1st to 10thDay
432342446%7%60%
1800
11th to 20thDay
321221323477%
1800
21st to endDay
431332223472%
1980
November1st to 10thDay
232223347%72%
1760
11th to 20thDay
2212322346%73%
1710
21st to endDay
36%34323346%63%
1710
December1st to 10thDay
46%23323346%64%
1539
11th to 20thDay
45%245%23449%57%
1926
21st to endDay
37%24423347%62%
2794
January1st to 10thNight
26%23323345%66%
2567
11th to 20thNight
5%5%14323445%63%
2379
21st to endNight
46%24333337%62%
2574
February1st to 10thNight
27%35%323436%62%
2319
11th to 20thNight
5%8%24433446%56%
2098
21st to endNight
5%9%24323246%61%
1776
March1st to 10thNight
46%2442335%7%60%
2093
11th to 20thNight
6%6%24424446%59%
1980
21st to endNight
5%5%24424347%60%
2093
April1st to 10thNight
3424424448%61%
1800
11th to 20thNight
46%2432445%7%57%
1777
21st to endNight
44234335%5%6%61%
1800
May1st to 10thNight
4323323446%65%
1800
11th to 20thNight
5%435%43446%8%54%
1607
21st to endNight
321343345%6%67%
1552
June1st to 10thNight
111343446%11%62%
1440
11th to 20thNight
2212325%446%70%
1440
21st to endNight
3213435%5%7%11%55%
1440
July1st to 10thNight
3325%5%37%6%9%10%45%
1440
11th to 20thNight
2313436%7%9%14%48%
1568
21st to endNight
4325%6%47%9%11%13%36%
1773
August1st to 10thNight
33135%46%7%7%12%49%
1663
11th to 20thNight
4426%7%47%7%9%11%40%
1778
21st to endNight
3225%5%35%8%9%11%48%
1980
September1st to 10thNight
5%3235%45%6%7%9%51%
1800
11th to 20thNight
43133235%5%9%62%
1800
21st to endNight
5%31332335%6%66%
1989
October1st to 10thNight
5%313424447%62%
2160
11th to 20thNight
3213212335%77%
2160
21st to endNight
4313223445%70%
2376
November1st to 10thNight
3211112336%76%
2300
11th to 20thNight
2312212236%76%
2470
21st to endNight
5%5%23322246%64%
2470
December1st to 10thNight
5%6%24323346%62%
2636
11th to 20thNight
36%244245%5%9%55%
3271
21st to endNight
37%36%434345%58%
4873

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
20%7%14%33%23%3
1614
11th to 20thDay
21%6%14%32%25%3
1642
21st to endDay
25%6%12%27%24%6%
1782
February1st to 10thDay
26%7%15%25%21%7%
1638
11th to 20thDay
27%6%11%25%24%7%
1759
21st to endDay
26%5%13%18%27%12%
1480
March1st to 10thDay
24%6%12%22%26%10%
1863
11th to 20thDay
26%6%11%21%29%6%
1980
21st to endDay
25%7%14%22%26%7%
2263
April1st to 10thDay
20%5%12%24%25%14%
2160
11th to 20thDay
23%6%11%19%29%12%
2134
21st to endDay
21%6%11%24%27%10%
2160
May1st to 10thDay
18%6%11%21%32%12%
2160
11th to 20thDay
26%7%15%20%24%8%
2287
21st to endDay
17%7%11%19%26%20%
2724
June1st to 10thDay
14%8%16%21%23%18%
2520
11th to 20thDay
11%5%10%16%25%33%
2520
21st to endDay
22%7%13%19%22%18%
2520
July1st to 10thDay
26%12%18%16%16%12%
2451
11th to 20thDay
23%14%22%21%12%7%
2316
21st to endDay
33%19%25%17%5%1
2404
August1st to 10thDay
28%17%20%15%12%8%
2260
11th to 20thDay
26%13%18%20%16%7%
2123
21st to endDay
24%11%19%23%18%5%
2376
September1st to 10thDay
26%9%17%21%19%9%
2160
11th to 20thDay
21%9%13%18%25%14%
2160
21st to endDay
14%7%12%22%34%12%
1966
October1st to 10thDay
23%8%12%19%25%14%
1800
11th to 20thDay
13%46%17%41%19%
1800
21st to endDay
17%410%25%34%10%
1980
November1st to 10thDay
12%413%24%35%12%
1760
11th to 20thDay
14%5%11%29%35%6%
1710
21st to endDay
22%5%11%24%28%10%
1710
December1st to 10thDay
21%6%15%30%21%7%
1539
11th to 20thDay
24%11%13%21%26%5%
1924
21st to endDay
22%5%13%23%30%8%
2794
January1st to 10thNight
22%6%14%29%25%3
2567
11th to 20thNight
23%6%13%28%25%4
2379
21st to endNight
25%5%11%30%24%5%
2574
February1st to 10thNight
25%6%15%25%22%7%
2319
11th to 20thNight
29%6%13%24%22%6%
2098
21st to endNight
25%410%21%31%10%
1776
March1st to 10thNight
25%412%24%26%10%
2093
11th to 20thNight
25%7%12%23%26%7%
1980
21st to endNight
25%6%12%21%30%7%
2093
April1st to 10thNight
20%6%11%24%28%11%
1800
11th to 20thNight
25%5%12%18%27%13%
1777
21st to endNight
23%7%11%22%26%11%
1800
May1st to 10thNight
21%6%11%16%33%14%
1800
11th to 20thNight
29%9%11%19%21%11%
1608
21st to endNight
16%7%13%20%25%20%
1552
June1st to 10thNight
17%8%18%20%19%18%
1440
11th to 20thNight
15%49%13%25%34%
1440
21st to endNight
22%8%14%15%22%19%
1440
July1st to 10thNight
30%13%16%15%11%15%
1400
11th to 20thNight
22%15%22%20%11%10%
1517
21st to endNight
31%18%29%18%5%
1674
August1st to 10thNight
23%18%23%15%11%10%
1654
11th to 20thNight
32%14%19%19%9%7%
1778
21st to endNight
23%12%20%23%16%6%
1980
September1st to 10thNight
25%11%15%24%16%9%
1800
11th to 20thNight
18%8%16%17%25%16%
1800
21st to endNight
17%7%11%19%33%13%
1989
October1st to 10thNight
21%8%12%20%25%14%
2160
11th to 20thNight
12%46%18%41%18%
2160
21st to endNight
16%5%9%25%34%11%
2376
November1st to 10thNight
11%49%26%40%11%
2300
11th to 20thNight
12%310%31%35%9%
2470
21st to endNight
23%410%22%30%11%
2470
December1st to 10thNight
24%6%11%30%24%5%
2636
11th to 20thNight
26%8%13%22%25%5%
3272
21st to endNight
27%6%12%23%27%5%
4873

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%13%37%29%12%1
270
11th to 20thDay
10%11%32%38%7%2
248
21st to endDay
5%8%41%34%11%1
264
February1st to 10thDay
315%37%33%10%
240
11th to 20thDay
5%18%41%27%8%
240
21st to endDay
11%28%32%25%41
198
March1st to 10thDay
7%24%33%28%8%
303
11th to 20thDay
11%23%32%24%9%2
420
21st to endDay
14%29%35%17%5%
462
April1st to 10thDay
10%24%39%20%7%1
420
11th to 20thDay
11%28%41%14%5%1
412
21st to endDay
11%27%39%20%3
420
May1st to 10thDay
7%22%42%22%6%1
423
11th to 20thDay
6%14%32%33%14%2
535
21st to endDay
6%12%31%35%14%1
679
June1st to 10thDay
35%26%40%25%2
630
11th to 20thDay
29%27%36%23%4
630
21st to endDay
5%6%23%35%27%5%
630
July1st to 10thDay
4214%38%36%6%
621
11th to 20thDay
3111%32%40%13%
489
21st to endDay
419%31%42%13%
487
August1st to 10thDay
4313%38%33%9%
447
11th to 20thDay
3319%37%32%6%
437
21st to endDay
3115%41%30%10%
495
September1st to 10thDay
4318%35%31%8%
450
11th to 20thDay
4423%39%24%6%
450
21st to endDay
27%22%33%27%8%
282
October1st to 10thDay
314%23%30%23%6%
270
11th to 20thDay
7%12%24%30%21%6%
270
21st to endDay
8%12%26%31%21%3
297
November1st to 10thDay
5%15%29%35%15%2
270
11th to 20thDay
6%7%27%39%20%1
270
21st to endDay
9%13%32%26%18%3
270
December1st to 10thDay
9%15%31%29%14%2
270
11th to 20thDay
9%10%34%36%10%1
270
21st to endDay
13%15%36%30%32
297
January1st to 10thNight
5%6%32%43%14%1
870
11th to 20thNight
8%334%41%12%2
732
21st to endNight
6%5%32%43%12%1
792
February1st to 10thNight
5%5%39%40%10%
720
11th to 20thNight
9%7%41%35%8%1
704
21st to endNight
9%9%41%38%3
592
March1st to 10thNight
6%10%39%35%8%1
720
11th to 20thNight
7%9%31%38%16%
720
21st to endNight
8%11%38%36%7%
707
April1st to 10thNight
5%11%46%33%6%
540
11th to 20thNight
7%15%35%36%7%
533
21st to endNight
6%8%42%36%8%
540
May1st to 10thNight
48%37%41%10%
540
11th to 20thNight
8%430%42%16%1
531
21st to endNight
47%31%46%12%
584
June1st to 10thNight
1226%50%20%
540
11th to 20thNight
2424%52%17%1
540
21st to endNight
2217%50%28%1
540
July1st to 10thNight
419%46%38%2
525
11th to 20thNight
315%41%47%4
522
21st to endNight
415%31%53%6%
591
August1st to 10thNight
416%36%47%7%
537
11th to 20thNight
419%48%36%2
534
21st to endNight
317%45%40%3
594
September1st to 10thNight
6%111%48%33%1
540
11th to 20thNight
412%54%28%2
540
21st to endNight
6%319%50%23%1
562
October1st to 10thNight
6%325%47%18%1
720
11th to 20thNight
3328%45%17%3
720
21st to endNight
5%427%40%20%3
792
November1st to 10thNight
35%26%46%18%1
820
11th to 20thNight
3429%46%15%1
950
21st to endNight
8%7%28%38%18%1
950
December1st to 10thNight
7%8%32%42%11%1
950
11th to 20thNight
8%8%31%42%11%
950
21st to endNight
6%9%36%42%7%1
1045
Page generated at 2024-01-10 17:35:20. Version ac07

Copyright 2024 Attilla Danko


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