Pace/Milton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pace/Milton 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
57%
15211
23%
46940
18%
15168
63%
15168
31%
28082

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
37%
720
24%
2223
12%
716
49%
716
26%
1376
January16th to endNight
33%
768
25%
2304
13%
768
43%
768
25%
1488
February1st to 15thNight
39%
703
29%
2109
14%
700
51%
700
31%
1262
February16th to endNight
34%
631
23%
1893
12%
631
44%
631
26%
1212
March1st to 15thNight
42%
720
23%
2160
13%
720
50%
720
30%
1302
March16th to endNight
52%
690
26%
2038
18%
690
58%
690
34%
1196
April1st to 15thNight
51%
539
25%
1797
22%
539
59%
539
30%
1049
April16th to endNight
61%
540
28%
1800
26%
540
69%
540
41%
911
May1st to 15thNight
64%
539
21%
1736
19%
539
68%
539
37%
952
May16th to endNight
75%
561
23%
1682
22%
561
76%
561
37%
974
June1st to 15thNight
75%
540
14%
1620
14%
540
76%
540
33%
961
June16th to endNight
79%
540
16%
1620
16%
540
79%
540
30%
1015
July1st to 15thNight
83%
510
12%
1530
13%
510
83%
510
30%
970
July16th to endNight
82%
564
10%
1764
12%
531
82%
531
27%
1103
August1st to 15thNight
82%
539
10%
1788
12%
536
82%
536
27%
1127
August16th to endNight
70%
573
15%
1910
18%
573
70%
573
22%
1249
September1st to 15thNight
69%
605
16%
1842
16%
605
70%
605
27%
1175
September16th to endNight
67%
657
27%
1815
21%
657
70%
657
33%
1128
October1st to 15thNight
68%
660
34%
1815
26%
660
74%
660
48%
982
October16th to endNight
57%
704
34%
2042
28%
704
64%
704
40%
1135
November1st to 15thNight
57%
700
31%
2276
28%
700
65%
700
36%
1216
November16th to endNight
47%
720
30%
2340
23%
720
59%
720
36%
1261
December1st to 15thNight
44%
720
25%
2340
20%
720
52%
720
28%
1407
December16th to endNight
37%
768
21%
2496
15%
768
45%
768
21%
1631

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
9%425%5%35%5%6%8%40%
47697
Night
9%42442445%8%47%
47155
TransparencyDay
37%8%12%17%16%7%
47410
Night
33%6%13%18%18%8%
46946
SeeingDay
11%415%23%26%19%
5155
Night
11%419%29%27%7%
15215

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
13%425%5%2345%8%44%
1713
16th to endDay
18%6%24324445%44%
1920
February1st to 15thDay
14%32432445%7%45%
1750
16th to endDay
14%6%24435%35%6%44%
1580
March1st to 15thDay
11%5%25%5%34448%44%
1800
16th to endDay
10%5%245%24446%48%
2192
April1st to 15thDay
12%5%2442445%7%46%
2151
16th to endDay
7%4245%2345%8%50%
2160
May1st to 15thDay
7%326%43446%8%47%
2214
16th to endDay
5%325%6%36%6%6%10%43%
2431
June1st to 15thDay
6%5%26%6%5%7%6%8%12%32%
2340
16th to endDay
6%325%7%48%7%10%13%30%
2340
July1st to 15thDay
6%6%38%9%48%8%9%11%22%
2340
16th to endDay
6%5%37%8%5%10%9%8%10%23%
2282
August1st to 15thDay
8%5%26%8%5%8%8%9%11%24%
2160
16th to endDay
11%5%37%7%46%7%8%9%28%
2292
September1st to 15thDay
10%5%36%7%5%7%6%7%9%30%
2026
16th to endDay
8%426%5%36%6%6%7%42%
1815
October1st to 15thDay
6%32442345%8%52%
1815
16th to endDay
8%325%42333458%
1826
November1st to 15thDay
9%423223447%55%
1582
16th to endDay
8%31432445%6%53%
1620
December1st to 15thDay
11%5%25%5%24436%46%
1620
16th to endDay
19%9%35%5%23346%36%
1728
January1st to 15thNight
12%6%25%4335%46%46%
2223
16th to endNight
18%5%34423445%44%
2304
February1st to 15thNight
13%5%13323346%50%
2103
16th to endNight
15%7%24424435%45%
1893
March1st to 15thNight
11%5%25%5%23347%46%
2160
16th to endNight
10%424434347%51%
2038
April1st to 15thNight
10%5%2342445%7%47%
1797
16th to endNight
7%313413337%59%
1800
May1st to 15thNight
8%324324449%52%
1736
16th to endNight
43244346%5%10%50%
1682
June1st to 15thNight
5%3144245%8%13%43%
1620
16th to endNight
5%323337%8%7%13%40%
1620
July1st to 15thNight
4223447%7%9%14%39%
1620
16th to endNight
3224437%7%11%14%38%
1883
August1st to 15thNight
4215%5%35%6%10%14%38%
1800
16th to endNight
8%426%6%37%6%6%10%37%
1910
September1st to 15thNight
7%5%25%5%36%7%8%11%37%
1842
16th to endNight
7%5%246%3445%8%46%
1815
October1st to 15thNight
5%3123135%6%8%58%
1815
16th to endNight
8%41331334460%
2042
November1st to 15thNight
7%424323347%55%
2276
16th to endNight
9%413423346%55%
2340
December1st to 15thNight
10%6%25%42435%6%47%
2340
16th to endNight
16%6%35%5%2425%6%39%
2496

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
37%47%15%24%9%
1714
16th to endDay
41%36%15%23%10%
1920
February1st to 15thDay
36%47%17%22%11%
1752
16th to endDay
39%5%7%16%21%9%
1580
March1st to 15thDay
37%5%10%19%19%8%
1800
16th to endDay
35%411%20%18%9%
2193
April1st to 15thDay
35%49%19%20%9%
2151
16th to endDay
30%6%12%23%20%7%
2160
May1st to 15thDay
31%6%14%20%19%7%
2214
16th to endDay
32%9%14%24%16%2
2435
June1st to 15thDay
38%10%17%24%8%
2340
16th to endDay
37%13%18%19%9%1
2340
July1st to 15thDay
46%15%20%13%3
2201
16th to endDay
46%14%19%16%2
2138
August1st to 15thDay
43%14%22%13%5%
2148
16th to endDay
45%12%19%13%7%2
2292
September1st to 15thDay
44%11%16%13%10%3
2026
16th to endDay
36%9%11%17%17%8%
1815
October1st to 15thDay
27%5%11%17%21%15%
1815
16th to endDay
28%35%13%26%21%
1826
November1st to 15thDay
27%5%7%19%25%14%
1582
16th to endDay
28%5%7%17%23%16%
1620
December1st to 15thDay
37%5%9%18%20%7%
1620
16th to endDay
48%5%6%18%15%6%
1728
January1st to 15thNight
39%47%13%26%9%
2223
16th to endNight
42%36%13%23%10%
2304
February1st to 15thNight
35%45%18%22%14%
2112
16th to endNight
41%36%13%20%13%
1893
March1st to 15thNight
36%411%18%20%8%
2160
16th to endNight
33%48%22%19%11%
2038
April1st to 15thNight
34%5%10%16%22%10%
1797
16th to endNight
25%313%28%21%7%
1800
May1st to 15thNight
28%5%15%19%23%8%
1737
16th to endNight
28%8%17%24%17%4
1684
June1st to 15thNight
28%11%23%22%12%1
1620
16th to endNight
29%14%22%22%10%1
1620
July1st to 15thNight
29%14%30%19%5%
1530
16th to endNight
29%15%32%18%3
1764
August1st to 15thNight
29%16%31%18%4
1788
16th to endNight
39%11%22%17%5%3
1910
September1st to 15thNight
34%10%20%17%12%3
1842
16th to endNight
33%7%13%19%19%6%
1815
October1st to 15thNight
22%410%21%23%16%
1815
16th to endNight
28%35%13%25%23%
2042
November1st to 15thNight
29%36%17%26%16%
2276
16th to endNight
30%37%17%22%18%
2340
December1st to 15thNight
36%5%8%20%22%7%
2340
16th to endNight
45%5%7%19%15%6%
2496

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
15%16%32%21%10%4
90
16th to endDay
23%19%29%19%7%
96
February1st to 15thDay
8%20%35%22%12%1
90
16th to endDay
9%16%40%27%6%
81
March1st to 15thDay
17%12%43%23%3
90
16th to endDay
14%7%23%29%21%3
282
April1st to 15thDay
17%8%27%22%21%3
270
16th to endDay
8%422%29%25%9%
270
May1st to 15thDay
9%6%16%29%25%13%
288
16th to endDay
8%215%26%25%21%
331
June1st to 15thDay
11%18%26%25%27%
315
16th to endDay
11%420%29%34%
315
July1st to 15thDay
3212%37%42%
305
16th to endDay
6%1413%37%36%
326
August1st to 15thDay
9%415%31%37%
313
16th to endDay
9%5%13%38%32%
332
September1st to 15thDay
10%28%23%31%25%
299
16th to endDay
11%8%32%32%15%
254
October1st to 15thDay
6%213%37%30%9%
255
16th to endDay
10%320%29%22%13%
187
November1st to 15thDay
22%20%35%17%4
90
16th to endDay
10%7%36%30%10%5%
90
December1st to 15thDay
13%11%34%28%11%1
90
16th to endDay
33%10%17%25%13%
96
January1st to 15thNight
15%11%31%31%9%
720
16th to endNight
21%11%29%29%9%
768
February1st to 15thNight
16%9%30%31%11%
704
16th to endNight
17%9%32%31%7%
631
March1st to 15thNight
14%9%29%35%11%
720
16th to endNight
12%6%25%35%18%1
690
April1st to 15thNight
14%5%23%36%20%1
539
16th to endNight
8%420%35%29%2
540
May1st to 15thNight
10%215%39%28%4
540
16th to endNight
7%9%28%46%7%
563
June1st to 15thNight
6%7%25%47%12%
540
16th to endNight
6%1216%52%20%
540
July1st to 15thNight
5%115%48%29%
510
16th to endNight
5%214%50%27%
564
August1st to 15thNight
4210%51%30%
539
16th to endNight
9%416%43%24%
573
September1st to 15thNight
8%16%20%44%17%
605
16th to endNight
10%10%33%36%8%
657
October1st to 15thNight
6%116%37%31%5%
660
16th to endNight
12%420%30%27%4
704
November1st to 15thNight
8%423%39%22%2
700
16th to endNight
12%5%29%35%15%1
720
December1st to 15thNight
14%7%28%31%15%2
720
16th to endNight
20%7%28%29%12%
768
Page generated at 2017-09-13 06:39:06. Version ac04

Copyright 2017 A. Danko


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