Pace/Milton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pace/Milton clear sky chart from 2005-11-06 to 2024-01-11.

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
55%
23440
22%
74456
17%
23387
61%
23387
29%
44881

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
33%
760
23%
2389
11%
757
46%
757
24%
1493
January11th to 20thNight
40%
724
28%
2172
16%
724
50%
724
29%
1322
January21st to endNight
30%
792
26%
2376
12%
792
43%
792
23%
1561
February1st to 10thNight
35%
720
25%
2160
13%
720
45%
720
26%
1372
February11th to 20thNight
34%
702
22%
2099
10%
700
44%
700
26%
1336
February21st to endNight
30%
592
21%
1776
11%
592
38%
592
22%
1191
March1st to 10thNight
40%
720
25%
2160
14%
720
48%
720
31%
1291
March11th to 20thNight
42%
720
21%
2077
13%
720
48%
720
29%
1300
March21st to endNight
46%
676
26%
2062
16%
676
55%
676
32%
1208
April1st to 10thNight
46%
540
25%
1800
20%
540
54%
540
26%
1080
April11th to 20thNight
49%
533
24%
1775
20%
533
58%
533
30%
1050
April21st to endNight
62%
540
31%
1800
29%
540
70%
540
42%
881
May1st to 10thNight
64%
540
24%
1796
24%
540
68%
540
38%
946
May11th to 20thNight
68%
531
18%
1592
17%
531
70%
531
34%
946
May21st to endNight
75%
582
24%
1744
23%
582
76%
582
36%
1014
June1st to 10thNight
70%
540
16%
1620
16%
540
70%
540
31%
1001
June11th to 20thNight
81%
540
18%
1620
17%
540
82%
540
32%
975
June21st to endNight
74%
540
12%
1620
12%
540
75%
540
29%
1034
July1st to 10thNight
78%
525
11%
1575
11%
525
78%
525
25%
1037
July11th to 20thNight
79%
522
10%
1641
12%
522
79%
522
27%
1064
July21st to endNight
84%
591
12%
1858
14%
558
84%
558
30%
1119
August1st to 10thNight
84%
537
10%
1778
13%
534
84%
534
29%
1075
August11th to 20thNight
79%
534
10%
1776
12%
534
79%
534
22%
1170
August21st to endNight
67%
594
15%
1980
18%
594
67%
594
21%
1324
September1st to 10thNight
74%
566
17%
1826
18%
566
74%
566
28%
1139
September11th to 20thNight
64%
720
18%
1980
14%
720
67%
720
28%
1307
September21st to endNight
68%
720
29%
1980
24%
720
70%
720
36%
1197
October1st to 10thNight
62%
720
29%
1980
22%
720
68%
720
42%
1137
October11th to 20thNight
65%
720
39%
1980
29%
720
73%
720
47%
1058
October21st to endNight
56%
792
32%
2350
27%
792
62%
792
36%
1335
November1st to 10thNight
58%
740
29%
2406
26%
740
67%
740
39%
1238
November11th to 20thNight
49%
760
31%
2470
24%
760
60%
760
33%
1359
November21st to endNight
45%
760
27%
2470
21%
760
55%
760
31%
1427
December1st to 10thNight
42%
760
26%
2470
19%
760
53%
760
28%
1478
December11th to 20thNight
39%
759
23%
2908
16%
758
48%
758
21%
1752
December21st to endNight
34%
828
15%
4390
14%
817
43%
817
13%
2664

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
10%5%26%6%45%5%6%9%41%
74751
Night
10%5%25%5%35%5%6%8%47%
74952
TransparencyDay
37%8%13%18%17%7%
74486
Night
34%8%13%18%19%8%
74736
SeeingDay
11%7%20%26%23%13%
13442
Night
12%6%20%30%26%7%
23452

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 10thDay
14%5%25%6%345%5%7%43%
1772
11th to 20thDay
13%6%25%42445%7%48%
1800
21st to endDay
18%7%35%42445%7%42%
1980
February1st to 10thDay
18%5%36%6%34446%42%
1800
11th to 20thDay
15%5%245%35%5%6%8%43%
1748
21st to endDay
15%7%26%6%35%5%6%7%38%
1480
March1st to 10thDay
10%5%35%6%35%45%7%47%
1800
11th to 20thDay
14%5%25%5%35%45%8%43%
1880
21st to endDay
12%6%245%3445%7%48%
2308
April1st to 10thDay
11%6%35%5%3346%9%46%
2160
11th to 20thDay
12%5%35%5%36%45%7%46%
2134
21st to endDay
7%4245%3445%8%55%
2160
May1st to 10thDay
8%42433445%8%54%
2163
11th to 20thDay
5%427%7%46%6%7%9%44%
2301
21st to endDay
7%425%5%36%6%7%11%44%
2531
June1st to 10thDay
7%7%47%7%5%7%6%8%12%30%
2340
11th to 20thDay
5%3246%5%8%8%11%13%34%
2340
21st to endDay
7%426%9%5%7%8%9%13%30%
2340
July1st to 10thDay
8%6%38%9%5%9%8%9%11%25%
2340
11th to 20thDay
7%6%38%9%5%9%8%10%12%22%
2260
21st to endDay
5%5%37%8%6%8%9%9%11%27%
2350
August1st to 10thDay
7%426%7%5%8%9%11%13%28%
2148
11th to 20thDay
9%5%27%8%49%9%8%12%26%
2125
21st to endDay
11%6%37%7%5%6%7%8%10%30%
2376
September1st to 10thDay
8%426%8%47%7%8%11%34%
2116
11th to 20thDay
11%6%37%6%47%5%6%8%36%
1980
21st to endDay
8%5%26%5%45%5%6%7%48%
1980
October1st to 10thDay
7%4245%335%5%9%53%
1980
11th to 20thDay
8%32442445%9%55%
1980
21st to endDay
9%425%5%2445%5%55%
2000
November1st to 10thDay
8%42432445%5%59%
1672
11th to 20thDay
9%42442436%9%53%
1710
21st to endDay
11%5%25%435%5%5%7%48%
1710
December1st to 10thDay
12%5%26%5%35%45%7%46%
1710
11th to 20thDay
15%8%36%6%34446%42%
2153
21st to endDay
16%9%35%5%33446%40%
3124
January1st to 10thNight
15%6%25%5%345%46%45%
2389
11th to 20thNight
12%7%35%424446%48%
2172
21st to endNight
19%6%35%434445%43%
2376
February1st to 10thNight
14%7%36%42435%7%45%
2160
11th to 20thNight
17%7%24423445%46%
2098
21st to endNight
17%8%36%5%35%5%5%6%38%
1776
March1st to 10thNight
10%6%35%5%3335%8%49%
2160
11th to 20thNight
12%6%35%5%4446%8%44%
2077
21st to endNight
10%5%24435%5%5%8%49%
2062
April1st to 10thNight
13%6%35%42446%7%46%
1800
11th to 20thNight
13%5%145%245%5%7%47%
1775
21st to endNight
6%3235%24447%62%
1800
May1st to 10thNight
9%324424448%56%
1796
11th to 20thNight
5%425%5%35%7%6%10%48%
1592
21st to endNight
6%4245%35%6%6%11%49%
1744
June1st to 10thNight
8%5%25%6%336%8%12%41%
1620
11th to 20thNight
4214436%7%9%12%47%
1620
21st to endNight
5%435%5%47%8%7%14%39%
1620
July1st to 10thNight
5%435%5%5%7%8%8%13%38%
1620
11th to 20thNight
4325%5%46%7%12%15%37%
1695
21st to endNight
3224448%8%10%14%42%
1968
August1st to 10thNight
3315%435%6%10%15%44%
1790
11th to 20thNight
5%326%6%5%8%8%8%13%36%
1776
21st to endNight
8%5%27%6%47%7%8%10%36%
1980
September1st to 10thNight
7%5%26%5%45%8%8%13%39%
1826
11th to 20thNight
9%6%25%6%45%6%6%8%43%
1980
21st to endNight
7%425%6%35%46%9%50%
1980
October1st to 10thNight
6%4244245%5%9%55%
1980
11th to 20thNight
7%32322345%6%63%
1980
21st to endNight
10%5%2442435%6%55%
2350
November1st to 10thNight
8%42332335%7%59%
2406
11th to 20thNight
11%425%434446%54%
2470
21st to endNight
11%5%245%3445%7%49%
2470
December1st to 10thNight
12%6%25%5%2445%6%48%
2470
11th to 20thNight
14%6%36%43445%7%44%
3042
21st to endNight
16%9%37%6%34345%42%
4532

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
40%5%6%16%23%10%
1773
11th to 20thDay
35%5%9%16%25%10%
1800
21st to endDay
43%46%14%22%11%
1980
February1st to 10thDay
45%47%15%19%10%
1800
11th to 20thDay
39%5%8%17%20%11%
1758
21st to endDay
43%8%10%13%16%10%
1480
March1st to 10thDay
36%6%9%19%21%10%
1800
11th to 20thDay
39%6%12%16%18%9%
1880
21st to endDay
36%6%10%21%19%8%
2308
April1st to 10thDay
36%5%12%17%20%10%
2160
11th to 20thDay
36%6%9%18%20%10%
2134
21st to endDay
28%5%11%24%23%10%
2160
May1st to 10thDay
26%6%12%25%22%8%
2163
11th to 20thDay
34%9%17%20%17%3
2305
21st to endDay
31%10%15%24%18%3
2531
June1st to 10thDay
42%10%17%23%8%1
2340
11th to 20thDay
32%13%20%23%10%2
2340
21st to endDay
39%14%21%16%9%2
2340
July1st to 10thDay
46%14%22%14%4
2275
11th to 20thDay
46%16%21%13%31
2191
21st to endDay
41%15%21%18%4
2219
August1st to 10thDay
37%17%25%16%5%
2136
11th to 20thDay
42%16%24%12%6%
2125
21st to endDay
44%12%18%15%8%2
2376
September1st to 10thDay
37%14%19%14%11%5%
2116
11th to 20thDay
42%10%14%15%12%7%
1980
21st to endDay
34%7%11%18%21%9%
1980
October1st to 10thDay
28%7%13%19%20%14%
1980
11th to 20thDay
26%5%10%19%26%14%
1980
21st to endDay
32%46%12%27%19%
2000
November1st to 10thDay
26%5%9%20%23%17%
1672
11th to 20thDay
29%5%8%17%28%14%
1710
21st to endDay
33%6%8%19%22%12%
1710
December1st to 10thDay
37%7%11%17%20%9%
1710
11th to 20thDay
44%46%17%19%11%
2150
21st to endDay
44%5%6%18%22%5%
3124
January1st to 10thNight
40%5%6%12%26%10%
2389
11th to 20thNight
37%47%16%25%10%
2172
21st to endNight
44%46%11%25%9%
2376
February1st to 10thNight
40%5%6%17%21%11%
2160
11th to 20thNight
41%47%14%20%14%
2099
21st to endNight
45%5%9%15%13%13%
1776
March1st to 10thNight
35%5%10%18%22%11%
2160
11th to 20thNight
38%6%12%19%16%10%
2077
21st to endNight
33%5%12%20%19%10%
2062
April1st to 10thNight
37%6%11%14%20%12%
1800
11th to 20thNight
35%5%10%20%22%9%
1775
21st to endNight
23%5%11%28%26%8%
1800
May1st to 10thNight
27%5%13%21%26%8%
1796
11th to 20thNight
30%9%19%20%19%3
1593
21st to endNight
29%8%16%24%19%4
1745
June1st to 10thNight
32%10%22%24%11%1
1620
11th to 20thNight
25%15%22%25%11%2
1620
21st to endNight
32%14%26%18%9%1
1620
July1st to 10thNight
34%15%26%19%5%
1575
11th to 20thNight
29%18%33%16%4
1641
21st to endNight
27%15%33%21%4
1858
August1st to 10thNight
25%17%32%22%3
1778
11th to 20thNight
34%17%28%15%5%
1776
21st to endNight
40%12%20%18%6%3
1980
September1st to 10thNight
33%12%23%15%13%4
1826
11th to 20thNight
37%10%16%18%13%6%
1980
21st to endNight
29%9%13%21%20%8%
1980
October1st to 10thNight
27%6%11%19%22%14%
1980
11th to 20thNight
22%5%9%21%28%14%
1980
21st to endNight
31%5%5%14%27%17%
2350
November1st to 10thNight
26%49%18%25%18%
2406
11th to 20thNight
32%45%18%28%14%
2470
21st to endNight
35%49%18%21%13%
2470
December1st to 10thNight
37%6%10%20%21%7%
2470
11th to 20thNight
40%5%8%12%24%12%
3044
21st to endNight
46%5%6%18%21%4
4532

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
16%17%39%19%8%1
270
11th to 20thDay
13%15%31%28%11%2
240
21st to endDay
22%17%41%14%6%
264
February1st to 10thDay
22%18%34%22%4
240
11th to 20thDay
20%16%41%18%6%
240
21st to endDay
11%23%46%16%5%
198
March1st to 10thDay
11%20%38%27%5%
240
11th to 20thDay
18%15%33%24%10%1
320
21st to endDay
16%12%33%26%12%1
462
April1st to 10thDay
16%13%33%24%12%3
420
11th to 20thDay
15%12%30%25%16%2
412
21st to endDay
8%9%27%32%18%5%
420
May1st to 10thDay
9%8%23%31%21%7%
423
11th to 20thDay
6%221%35%20%16%
447
21st to endDay
9%312%32%28%17%
485
June1st to 10thDay
10%212%32%27%17%
450
11th to 20thDay
8%210%29%28%23%
450
21st to endDay
9%19%23%31%28%
450
July1st to 10thDay
7%35%17%35%33%
445
11th to 20thDay
5%26%14%37%36%
444
21st to endDay
5%16%21%40%27%
488
August1st to 10thDay
6%417%35%38%
446
11th to 20thDay
9%1416%34%35%
439
21st to endDay
10%27%21%34%25%
495
September1st to 10thDay
8%18%22%37%24%
450
11th to 20thDay
12%37%30%33%14%
450
21st to endDay
8%111%30%35%14%
450
October1st to 10thDay
8%420%38%24%6%
450
11th to 20thDay
7%418%31%30%10%
450
21st to endDay
13%8%22%34%18%5%
357
November1st to 10thDay
11%6%21%40%18%4
270
11th to 20thDay
13%10%31%31%13%2
270
21st to endDay
12%13%31%28%14%1
270
December1st to 10thDay
15%14%31%26%11%3
270
11th to 20thDay
22%15%31%24%7%
270
21st to endDay
25%10%31%21%12%1
297
January1st to 10thNight
19%12%32%30%6%
760
11th to 20thNight
14%12%28%34%11%
724
21st to endNight
22%10%32%29%6%
792
February1st to 10thNight
18%10%33%32%8%
720
11th to 20thNight
19%11%32%27%10%
703
21st to endNight
19%12%33%32%4
592
March1st to 10thNight
13%11%33%33%10%
720
11th to 20thNight
14%8%30%33%14%1
720
21st to endNight
12%8%29%35%14%1
676
April1st to 10thNight
16%7%25%37%15%1
540
11th to 20thNight
14%6%26%31%22%1
533
21st to endNight
6%6%21%38%27%2
540
May1st to 10thNight
10%417%39%26%4
540
11th to 20thNight
6%114%41%33%5%
531
21st to endNight
7%19%28%47%9%
584
June1st to 10thNight
9%27%28%44%10%
540
11th to 20thNight
425%25%49%15%
540
21st to endNight
7%15%20%48%19%
540
July1st to 10thNight
6%1217%50%23%
525
11th to 20thNight
5%1213%46%34%
522
21st to endNight
3317%53%23%
591
August1st to 10thNight
3312%49%31%
537
11th to 20thNight
6%212%52%27%
534
21st to endNight
9%27%19%42%21%
594
September1st to 10thNight
7%15%22%46%19%
566
11th to 20thNight
11%211%26%40%10%
720
21st to endNight
8%111%33%38%9%
720
October1st to 10thNight
8%220%38%28%5%
720
11th to 20thNight
8%5%17%34%31%5%
720
21st to endNight
13%5%20%35%25%2
792
November1st to 10thNight
10%422%41%20%2
740
11th to 20thNight
12%8%26%37%16%1
760
21st to endNight
13%6%29%36%14%2
760
December1st to 10thNight
15%8%29%32%14%2
760
11th to 20thNight
18%8%28%31%14%1
760
21st to endNight
22%11%28%30%9%
836
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