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 2018-01-12.

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%
16203
23%
48329
17%
16158
55%
16158
30%
29966

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
31%
956
20%
2662
10%
951
39%
951
24%
1805
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%
543
27%
1803
29%
543
71%
543
33%
1025
September16th to endNight
66%
717
30%
1980
24%
717
69%
717
39%
1154
October1st to 15thNight
61%
720
31%
2054
24%
720
66%
720
37%
1184
October16th to endNight
48%
768
30%
2364
23%
768
56%
768
33%
1397
November1st to 15thNight
47%
760
30%
2471
25%
760
57%
760
34%
1378
November16th to endNight
40%
780
27%
2535
21%
780
50%
780
29%
1508
December1st to 15thNight
36%
855
19%
2610
12%
855
43%
855
22%
1742
December16th to endNight
29%
1040
19%
2912
9%
1040
38%
1040
21%
2033

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%245%2445%7%42%
49012
Night
13%5%24423447%46%
48508
TransparencyDay
40%5%11%23%15%3
48696
Night
37%5%10%23%18%4
48330
SeeingDay
13%318%25%24%14%
6121
Night
16%5%23%31%20%3
16205

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
21%6%35%414445%38%
1520
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
11%6%14435%5%6%8%42%
2145
16th to endDay
11%4245%24446%49%
1980
October1st to 15thDay
12%5%245%23335%50%
1904
16th to endDay
16%32341234452%
1858
November1st to 15thDay
14%5%13324345%49%
1717
16th to endDay
18%7%23322345%46%
1755
December1st to 15thDay
19%8%24413445%39%
1677
16th to endDay
20%10%25%5%23336%35%
1664
January1st to 15thNight
19%7%35%323345%41%
2662
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%
1803
16th to endNight
10%323323346%55%
1980
October1st to 15thNight
9%5%14422347%53%
2054
16th to endNight
16%41442333452%
2364
November1st to 15thNight
13%424313347%51%
2471
16th to endNight
15%6%2432233450%
2535
December1st to 15thNight
20%7%24423445%39%
2610
16th to endNight
22%8%24423335%38%
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
47%47%26%11%2
1521
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%6%10%23%18%3
2145
16th to endDay
35%48%22%23%5%
1980
October1st to 15thDay
35%410%22%21%5%
1904
16th to endDay
35%35%29%21%5%
1858
November1st to 15thDay
36%47%20%23%7%
1717
16th to endDay
40%27%26%18%3
1755
December1st to 15thDay
46%411%21%13%2
1677
16th to endDay
50%313%19%10%2
1664
January1st to 15thNight
45%38%22%17%1
2662
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%
1803
16th to endNight
30%49%24%22%7%
1980
October1st to 15thNight
31%49%21%27%6%
2054
16th to endNight
35%35%22%25%6%
2364
November1st to 15thNight
32%37%23%24%8%
2471
16th to endNight
38%27%24%23%3
2535
December1st to 15thNight
45%5%10%20%15%3
2610
16th to endNight
49%311%20%12%2
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
34%435%16%8%
123
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
12%16%19%34%26%
315
16th to endDay
13%19%20%32%23%
314
October1st to 15thDay
14%313%33%24%10%
239
16th to endDay
15%425%31%17%6%
144
November1st to 15thDay
20%321%27%14%13%
135
16th to endDay
22%5%26%27%16%1
135
December1st to 15thDay
14%9%34%24%13%3
135
16th to endDay
30%11%39%13%4
144
January1st to 15thNight
22%12%29%29%5%
956
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%8%
543
16th to endNight
11%212%30%35%8%
717
October1st to 15thNight
11%218%31%29%6%
720
16th to endNight
19%324%33%16%2
768
November1st to 15thNight
14%6%25%33%18%
760
16th to endNight
19%7%28%29%13%1
780
December1st to 15thNight
24%7%27%29%9%
855
16th to endNight
25%7%31%29%4
1040
Page generated at 2018-01-12 21:01:29. Version ac04

Copyright 2018 A. Danko


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