Paxton Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Paxton Park clear sky chart from 2005-11-05 to

2017-09-12
.

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
49%
15687
23%
46792
17%
15642
55%
15642
29%
29053

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
30%
900
21%
2506
10%
895
39%
895
24%
1692
January16th to endNight
30%
960
21%
2514
9%
960
38%
960
28%
1700
February1st to 15thNight
28%
713
18%
2121
9%
710
35%
710
21%
1456
February16th to endNight
27%
631
20%
1893
9%
631
36%
631
22%
1269
March1st to 15thNight
30%
720
17%
2160
10%
720
36%
720
22%
1468
March16th to endNight
41%
594
17%
1998
14%
594
46%
594
21%
1327
April1st to 15thNight
41%
539
24%
1797
16%
539
55%
539
33%
1012
April16th to endNight
47%
540
24%
1800
21%
540
55%
540
29%
1074
May1st to 15thNight
48%
539
18%
1659
13%
539
54%
539
26%
1072
May16th to endNight
64%
562
21%
1606
17%
561
66%
561
31%
1010
June1st to 15thNight
71%
540
23%
1440
17%
540
73%
540
41%
863
June16th to endNight
77%
540
24%
1440
19%
540
78%
540
42%
835
July1st to 15thNight
73%
510
17%
1360
15%
510
74%
510
36%
852
July16th to endNight
78%
564
25%
1452
22%
531
80%
531
45%
814
August1st to 15thNight
78%
539
22%
1788
26%
536
79%
536
38%
944
August16th to endNight
75%
573
24%
1910
30%
573
76%
573
35%
1044
September1st to 15thNight
69%
533
27%
1770
29%
533
72%
533
33%
1000
September16th to endNight
63%
657
28%
1815
21%
657
66%
657
37%
1083
October1st to 15thNight
61%
660
32%
1883
25%
660
66%
660
38%
1079
October16th to endNight
48%
704
28%
2167
23%
704
56%
704
32%
1288
November1st to 15thNight
49%
700
31%
2276
26%
700
59%
700
36%
1233
November16th to endNight
38%
720
25%
2340
19%
720
48%
720
28%
1419
December1st to 15thNight
34%
789
18%
2409
11%
789
41%
789
21%
1639
December16th to endNight
30%
960
19%
2688
9%
960
39%
960
21%
1880

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
13%6%25%5%2445%7%42%
47872
Night
13%5%24423447%46%
46971
TransparencyDay
40%5%11%23%15%3
47556
Night
37%5%10%23%18%4
46793
SeeingDay
13%317%25%25%14%
5728
Night
16%5%23%31%20%3
15689

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 15thDay
22%6%35%424445%38%
1432
16th to endDay
14%6%36%5%34345%41%
1707
February1st to 15thDay
15%9%46%423345%38%
1739
16th to endDay
15%8%36%5%3435%6%37%
1580
March1st to 15thDay
20%8%34424445%37%
1800
16th to endDay
17%7%36%5%35%5%5%6%34%
2233
April1st to 15thDay
12%6%25%423447%44%
2151
16th to endDay
16%7%35%5%3445%6%37%
2160
May1st to 15thDay
17%6%34425%5%48%36%
2292
16th to endDay
10%6%26%6%35%5%6%8%38%
2505
June1st to 15thDay
7%4145%26%5%7%9%46%
2520
16th to endDay
5%3235%35%6%7%10%45%
2520
July1st to 15thDay
8%425%6%25%5%6%9%41%
2520
16th to endDay
43145%36%6%7%12%43%
2613
August1st to 15thDay
7%5%15%5%25%5%5%9%44%
2160
16th to endDay
8%4245%445%7%9%43%
2292
September1st to 15thDay
10%6%14435%5%6%8%42%
2098
16th to endDay
12%4245%24446%48%
1815
October1st to 15thDay
12%5%245%23335%52%
1746
16th to endDay
16%32341234452%
1703
November1st to 15thDay
13%5%13324346%51%
1582
16th to endDay
19%7%23322335%45%
1620
December1st to 15thDay
20%8%25%3145%45%37%
1548
16th to endDay
20%10%25%5%23336%36%
1536
January1st to 15thNight
18%7%35%323346%41%
2506
16th to endNight
15%6%35%423445%43%
2514
February1st to 15thNight
18%7%37%5%2333439%
2112
16th to endNight
15%6%37%5%335%35%40%
1893
March1st to 15thNight
17%8%34424445%40%
2160
16th to endNight
16%7%45%5%335%45%39%
1998
April1st to 15thNight
12%423423348%49%
1797
16th to endNight
15%5%243235%47%45%
1800
May1st to 15thNight
16%5%25%42445%7%41%
1658
16th to endNight
6%425%5%345%6%10%43%
1605
June1st to 15thNight
6%32442446%9%52%
1440
16th to endNight
42143346%7%12%50%
1440
July1st to 15thNight
7%3145%35%6%6%9%47%
1440
16th to endNight
5%22432346%12%53%
1550
August1st to 15thNight
43134245%6%9%54%
1800
16th to endNight
7%4134245%6%9%50%
1910
September1st to 15thNight
8%5%25%323446%52%
1770
16th to endNight
10%324423346%52%
1815
October1st to 15thNight
9%5%14422347%54%
1883
16th to endNight
16%41442333452%
2167
November1st to 15thNight
12%414212247%54%
2276
16th to endNight
17%6%2432233449%
2340
December1st to 15thNight
21%8%24423445%38%
2409
16th to endNight
22%8%2442333438%
2688

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
47%48%26%11%1
1433
16th to endDay
44%412%26%10%1
1707
February1st to 15thDay
48%39%24%12%2
1741
16th to endDay
47%412%21%11%2
1580
March1st to 15thDay
49%49%21%12%3
1800
16th to endDay
49%5%13%22%9%
2235
April1st to 15thDay
38%410%23%19%2
2151
16th to endDay
46%5%9%24%12%1
2160
May1st to 15thDay
45%8%11%19%13%
2292
16th to endDay
41%8%15%19%12%2
2509
June1st to 15thDay
31%8%14%25%18%2
2520
16th to endDay
30%8%14%23%19%3
2520
July1st to 15thDay
38%7%13%22%13%4
2371
16th to endDay
30%8%18%26%14%1
2449
August1st to 15thDay
34%8%14%24%16%2
2148
16th to endDay
33%7%14%23%16%4
2292
September1st to 15thDay
37%7%10%23%18%3
2098
16th to endDay
36%47%21%24%5%
1815
October1st to 15thDay
34%39%23%21%6%
1746
16th to endDay
35%35%29%21%4
1703
November1st to 15thDay
34%48%20%24%8%
1582
16th to endDay
42%27%26%16%3
1620
December1st to 15thDay
47%412%20%12%2
1548
16th to endDay
49%313%20%10%2
1536
January1st to 15thNight
45%38%22%17%1
2506
16th to endNight
42%411%24%15%1
2514
February1st to 15thNight
49%48%22%13%1
2121
16th to endNight
44%5%11%21%14%1
1893
March1st to 15thNight
46%5%9%18%15%5%
2160
16th to endNight
45%5%11%22%13%1
1998
April1st to 15thNight
32%412%26%19%5%
1797
16th to endNight
36%48%25%20%3
1800
May1st to 15thNight
40%6%11%22%17%1
1659
16th to endNight
34%8%13%23%15%3
1607
June1st to 15thNight
27%7%14%25%22%2
1440
16th to endNight
24%8%15%24%19%6%
1440
July1st to 15thNight
31%7%14%24%15%6%
1360
16th to endNight
23%6%17%32%17%1
1452
August1st to 15thNight
24%7%15%26%23%2
1788
16th to endNight
28%6%14%25%19%5%
1910
September1st to 15thNight
32%5%8%28%18%6%
1770
16th to endNight
32%5%9%21%23%8%
1815
October1st to 15thNight
30%49%21%27%6%
1883
16th to endNight
36%35%22%24%6%
2167
November1st to 15thNight
30%27%24%25%9%
2276
16th to endNight
40%27%24%21%3
2340
December1st to 15thNight
47%410%19%15%2
2409
16th to endNight
49%310%20%12%2
2688

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
38%433%15%6%1
90
16th to endDay
14%8%51%19%6%
96
February1st to 15thDay
17%13%42%22%4
90
16th to endDay
22%7%41%19%8%
81
March1st to 15thDay
24%445%17%6%1
90
16th to endDay
18%10%29%28%11%1
228
April1st to 15thDay
13%11%29%28%14%1
270
16th to endDay
19%5%24%29%15%5%
270
May1st to 15thDay
19%7%23%27%14%7%
288
16th to endDay
14%220%25%22%13%
405
June1st to 15thDay
9%114%26%28%20%
495
16th to endDay
7%14%34%29%13%
495
July1st to 15thDay
11%310%27%31%16%
475
16th to endDay
46%21%38%28%
509
August1st to 15thDay
9%6%19%37%26%
313
16th to endDay
13%422%37%21%
332
September1st to 15thDay
10%16%20%35%25%
299
16th to endDay
15%19%21%32%19%
254
October1st to 15thDay
12%316%32%24%11%
186
16th to endDay
15%221%33%19%7%
96
November1st to 15thDay
14%218%32%16%15%
90
16th to endDay
31%6%24%22%13%2
90
December1st to 15thDay
17%6%33%24%13%4
90
16th to endDay
23%12%42%15%5%
96
January1st to 15thNight
22%12%30%29%5%
900
16th to endNight
19%8%38%29%4
960
February1st to 15thNight
21%9%35%29%3
713
16th to endNight
18%12%37%28%2
631
March1st to 15thNight
20%9%33%31%4
720
16th to endNight
19%7%25%34%12%
594
April1st to 15thNight
13%8%33%31%11%1
539
16th to endNight
17%326%35%16%1
540
May1st to 15thNight
17%422%38%15%2
540
16th to endNight
7%115%40%31%3
563
June1st to 15thNight
8%112%37%36%3
540
16th to endNight
419%42%38%4
540
July1st to 15thNight
8%7%32%43%6%
510
16th to endNight
6%6%25%46%14%
564
August1st to 15thNight
7%6%27%47%10%
539
16th to endNight
9%432%46%6%
573
September1st to 15thNight
10%19%30%38%9%
533
16th to endNight
12%213%31%33%7%
657
October1st to 15thNight
12%219%30%29%6%
660
16th to endNight
19%424%33%16%1
704
November1st to 15thNight
13%7%25%33%19%1
700
16th to endNight
20%7%29%28%11%1
720
December1st to 15thNight
26%7%28%27%9%1
789
16th to endNight
26%8%30%29%4
960
Page generated at 2017-09-13 06:39:13. Version ac04

Copyright 2017 A. Danko


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