GM Milford Proving Ground Softball Fields
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the GM Milford Proving Ground Softball Fields clear sky chart from 2005-11-05 to 2017-10-16.

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
38%
16014
15%
47369
10%
15972
43%
15972
21%
32966

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
17%
900
9%
2506
4%
895
23%
895
12%
2001
January16th to endNight
22%
867
8%
2595
4%
867
26%
867
11%
2054
February1st to 15thNight
18%
701
10%
2255
3%
701
25%
701
11%
1722
February16th to endNight
25%
631
14%
1893
6%
631
32%
631
15%
1407
March1st to 15thNight
27%
720
15%
2082
8%
720
32%
720
18%
1512
March16th to endNight
34%
768
18%
2112
10%
768
40%
768
21%
1485
April1st to 15thNight
30%
581
14%
1808
7%
581
37%
581
19%
1252
April16th to endNight
37%
540
19%
1620
9%
540
46%
540
26%
1064
May1st to 15thNight
39%
540
14%
1620
8%
540
44%
540
22%
1111
May16th to endNight
50%
562
15%
1666
11%
561
55%
561
29%
1055
June1st to 15thNight
57%
540
14%
1440
11%
540
60%
540
34%
912
June16th to endNight
57%
540
17%
1440
13%
540
61%
540
35%
903
July1st to 15thNight
66%
510
16%
1360
14%
510
68%
510
40%
800
July16th to endNight
69%
564
19%
1493
16%
531
71%
531
39%
873
August1st to 15thNight
65%
539
20%
1609
17%
536
68%
536
35%
966
August16th to endNight
65%
573
23%
1745
18%
573
69%
573
34%
1017
September1st to 15thNight
59%
663
25%
1923
19%
663
63%
663
35%
1137
September16th to endNight
60%
717
25%
1980
19%
717
64%
717
35%
1213
October1st to 15thNight
45%
720
19%
2064
15%
720
50%
720
27%
1371
October16th to endNight
26%
708
14%
2222
8%
708
35%
708
16%
1593
November1st to 15thNight
36%
700
19%
2276
16%
700
42%
700
22%
1481
November16th to endNight
25%
720
13%
2374
9%
720
31%
720
14%
1731
December1st to 15thNight
17%
750
8%
2550
4%
750
22%
750
10%
1995
December16th to endNight
15%
960
7%
2736
1%
960
20%
960
8%
2311

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
14%8%47%6%35%45%7%32%
48039
Night
15%8%46%5%34446%35%
47546
Cloud CoverDay
14%8%47%6%35%45%7%32%
48049
Night
15%8%46%5%34446%35%
47550
TransparencyDay
49%6%11%19%10%1
47735
Night
48%5%12%20%11%1
47369
SeeingDay
17%6%26%24%16%8%
5966
Night
19%7%27%30%13%1
16018

By Month

Percentage Cloud Cover NE (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
17%16%7%10%7%345%5%5%16%
1432
16th to endDay
16%18%9%9%8%35%435%14%
1626
February1st to 15thDay
14%14%5%12%8%45%436%18%
1604
16th to endDay
14%15%6%12%7%34445%21%
1580
March1st to 15thDay
16%11%5%8%6%3435%5%28%
1867
16th to endDay
17%11%5%8%6%34345%30%
2112
April1st to 15thDay
20%10%36%5%34447%30%
2150
16th to endDay
16%8%36%5%2345%6%37%
2340
May1st to 15thDay
19%8%26%5%3445%5%32%
2331
16th to endDay
13%6%35%5%35%45%9%38%
2446
June1st to 15thDay
10%5%35%5%35%5%5%8%39%
2520
16th to endDay
10%425%7%37%6%7%10%33%
2520
July1st to 15thDay
7%5%246%35%5%6%8%44%
2520
16th to endDay
8%425%6%46%6%7%10%38%
2571
August1st to 15thDay
9%5%26%6%46%6%6%8%37%
2340
16th to endDay
11%5%26%5%36%5%6%8%39%
2455
September1st to 15thDay
11%5%25%6%345%5%8%40%
2025
16th to endDay
11%5%25%5%35%5%7%8%40%
1980
October1st to 15thDay
15%7%27%5%34446%38%
1895
16th to endDay
21%10%35%5%23446%31%
1668
November1st to 15thDay
15%7%36%5%3445%6%36%
1582
16th to endDay
17%12%6%9%5%34345%27%
1582
December1st to 15thDay
16%13%8%11%7%35%345%21%
1408
16th to endDay
21%16%9%10%5%3433316%
1485
January1st to 15thNight
22%13%5%7%6%34345%23%
2506
16th to endNight
14%12%7%12%7%35%5%5%6%20%
2595
February1st to 15thNight
16%14%5%9%6%35%34426%
2253
16th to endNight
15%12%48%8%34446%26%
1893
March1st to 15thNight
17%10%47%434445%32%
2070
16th to endNight
15%7%46%5%35%446%36%
2112
April1st to 15thNight
19%8%45%4245%5%6%33%
1808
16th to endNight
15%6%25%4245%47%39%
1620
May1st to 15thNight
17%7%35%5%35%45%7%34%
1620
16th to endNight
13%425%5%26%437%45%
1664
June1st to 15thNight
10%425%4235%5%9%46%
1440
16th to endNight
9%4244245%6%10%44%
1440
July1st to 15thNight
7%3245%2435%9%51%
1440
16th to endNight
5%325%425%45%9%51%
1595
August1st to 15thNight
5%424425%5%7%9%47%
1620
16th to endNight
9%5%24324447%51%
1745
September1st to 15thNight
11%41331345%6%52%
1923
16th to endNight
10%5%2442445%7%47%
1980
October1st to 15thNight
16%5%35%4345%5%6%40%
2064
16th to endNight
20%8%36%5%34446%32%
2222
November1st to 15thNight
15%7%35%5%345%46%39%
2276
16th to endNight
21%11%46%4245%46%27%
2374
December1st to 15thNight
20%13%6%8%6%3444422%
2550
16th to endNight
22%15%7%10%6%3435%415%
2736

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
17%16%7%10%7%45%45%5%16%
1432
16th to endDay
16%17%10%9%8%45%43414%
1626
February1st to 15thDay
14%14%5%12%8%45%5%46%18%
1604
16th to endDay
14%15%6%12%7%34445%21%
1580
March1st to 15thDay
16%11%5%8%6%3445%6%27%
1878
16th to endDay
17%10%5%8%6%34345%30%
2111
April1st to 15thDay
20%10%45%5%34447%30%
2150
16th to endDay
15%8%36%5%2435%6%37%
2340
May1st to 15thDay
19%7%36%6%35%45%6%31%
2331
16th to endDay
13%6%25%5%2445%10%38%
2446
June1st to 15thDay
10%6%36%5%35%5%5%8%39%
2520
16th to endDay
9%5%25%7%36%7%7%10%33%
2520
July1st to 15thDay
6%5%25%5%35%5%6%8%44%
2520
16th to endDay
7%425%6%46%6%7%10%37%
2571
August1st to 15thDay
9%6%26%6%45%7%6%8%37%
2340
16th to endDay
10%426%5%36%5%6%8%38%
2455
September1st to 15thDay
11%425%5%35%45%9%40%
2025
16th to endDay
11%5%345%35%5%7%8%40%
1980
October1st to 15thDay
14%7%36%6%34446%38%
1895
16th to endDay
20%10%35%5%23446%31%
1668
November1st to 15thDay
15%7%36%5%3445%7%36%
1582
16th to endDay
17%12%5%8%6%34345%27%
1582
December1st to 15thDay
15%13%8%11%7%25%445%20%
1408
16th to endDay
21%16%9%11%6%3433416%
1485
January1st to 15thNight
21%13%5%7%6%34335%22%
2506
16th to endNight
14%12%7%11%8%35%45%6%20%
2595
February1st to 15thNight
15%14%5%9%6%36%345%26%
2246
16th to endNight
15%11%5%8%7%3445%6%26%
1893
March1st to 15thNight
17%10%5%7%434345%32%
2082
16th to endNight
15%7%46%445%436%36%
2112
April1st to 15thNight
19%8%35%4245%5%6%33%
1808
16th to endNight
14%6%35%4245%47%39%
1620
May1st to 15thNight
17%7%35%5%245%6%6%34%
1619
16th to endNight
12%4245%25%438%45%
1664
June1st to 15thNight
10%425%4245%5%8%46%
1440
16th to endNight
9%425%42446%10%44%
1440
July1st to 15thNight
7%3145%2445%9%51%
1440
16th to endNight
5%225%435%45%9%51%
1595
August1st to 15thNight
5%4245%25%6%6%9%47%
1620
16th to endNight
9%42433335%6%51%
1745
September1st to 15thNight
11%5%23423446%52%
1923
16th to endNight
10%5%245%2445%7%47%
1980
October1st to 15thNight
16%6%25%5%2445%6%40%
2064
16th to endNight
20%8%36%6%24446%32%
2222
November1st to 15thNight
15%7%25%435%5%46%39%
2276
16th to endNight
21%11%47%424446%28%
2374
December1st to 15thNight
20%13%6%8%7%35%445%22%
2550
16th to endNight
22%16%7%10%6%3434415%
2736

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
68%5%10%10%3
1433
16th to endDay
71%6%8%9%4
1626
February1st to 15thDay
66%6%7%12%5%
1606
16th to endDay
63%5%10%13%5%1
1580
March1st to 15thDay
56%6%12%16%7%
1878
16th to endDay
56%410%18%8%1
2112
April1st to 15thDay
54%410%19%10%
2150
16th to endDay
46%5%14%16%14%2
2340
May1st to 15thDay
52%5%11%19%9%2
2331
16th to endDay
43%5%13%23%12%1
2450
June1st to 15thDay
40%7%12%24%14%1
2520
16th to endDay
41%9%13%19%15%
2520
July1st to 15thDay
35%7%10%25%18%2
2371
16th to endDay
38%9%14%20%15%2
2411
August1st to 15thDay
40%8%13%23%11%1
2327
16th to endDay
39%8%10%23%15%1
2455
September1st to 15thDay
39%7%12%25%13%
2025
16th to endDay
39%5%10%30%13%
1980
October1st to 15thDay
45%6%11%22%12%1
1895
16th to endDay
53%5%14%17%7%
1668
November1st to 15thDay
46%5%11%22%11%1
1582
16th to endDay
59%412%17%5%
1582
December1st to 15thDay
64%5%11%13%3
1408
16th to endDay
72%410%9%3
1485
January1st to 15thNight
63%5%11%12%7%
2506
16th to endNight
63%5%13%12%4
2595
February1st to 15thNight
60%5%11%15%7%
2255
16th to endNight
56%5%11%18%6%
1893
March1st to 15thNight
52%5%10%18%10%1
2082
16th to endNight
47%6%11%22%10%1
2112
April1st to 15thNight
49%410%19%14%
1808
16th to endNight
42%5%13%18%17%3
1620
May1st to 15thNight
47%5%12%20%11%2
1620
16th to endNight
38%5%13%24%15%3
1666
June1st to 15thNight
34%7%13%27%16%1
1440
16th to endNight
34%5%15%25%17%1
1440
July1st to 15thNight
29%5%10%30%21%2
1360
16th to endNight
28%6%16%24%20%3
1493
August1st to 15thNight
30%7%12%31%15%2
1609
16th to endNight
32%5%11%29%17%2
1745
September1st to 15thNight
31%5%10%30%19%1
1923
16th to endNight
34%412%29%17%
1980
October1st to 15thNight
42%5%11%22%16%1
2064
16th to endNight
52%5%11%21%8%
2222
November1st to 15thNight
44%5%12%23%12%1
2276
16th to endNight
56%412%19%6%
2374
December1st to 15thNight
63%5%11%13%5%
2550
16th to endNight
70%5%9%10%3
2736

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
18%13%42%18%5%1
90
16th to endDay
30%7%42%16%3
96
February1st to 15thDay
21%20%45%13%
90
16th to endDay
22%14%38%19%4
81
March1st to 15thDay
27%11%32%20%7%
168
16th to endDay
25%7%29%26%10%1
288
April1st to 15thDay
21%10%31%24%9%2
270
16th to endDay
21%8%30%19%12%7%
270
May1st to 15thDay
27%7%24%21%14%4
288
16th to endDay
17%7%23%23%17%9%
346
June1st to 15thDay
11%5%32%28%16%5%
495
16th to endDay
12%6%29%28%16%6%
495
July1st to 15thDay
10%5%21%28%22%10%
475
16th to endDay
8%323%29%23%11%
431
August1st to 15thDay
10%113%29%22%22%
313
16th to endDay
15%316%18%25%20%
332
September1st to 15thDay
12%220%21%24%18%
315
16th to endDay
15%115%21%28%16%
314
October1st to 15thDay
19%6%21%26%18%7%
315
16th to endDay
28%434%27%5%
174
November1st to 15thDay
12%14%25%27%17%2
90
16th to endDay
27%14%33%19%4
83
December1st to 15thDay
21%23%35%13%6%
60
16th to endDay
22%24%43%9%
87
January1st to 15thNight
26%12%35%19%5%
900
16th to endNight
19%10%34%29%5%
867
February1st to 15thNight
23%12%36%23%3
704
16th to endNight
21%11%33%29%3
631
March1st to 15thNight
22%10%32%27%5%
720
16th to endNight
18%9%31%30%9%1
768
April1st to 15thNight
22%10%30%29%6%
581
16th to endNight
18%7%32%30%9%1
540
May1st to 15thNight
19%6%26%36%8%1
540
16th to endNight
14%324%36%18%2
563
June1st to 15thNight
11%122%49%15%
540
16th to endNight
10%221%43%19%1
540
July1st to 15thNight
10%115%40%29%3
510
16th to endNight
5%215%48%25%3
564
August1st to 15thNight
7%115%43%28%3
539
16th to endNight
10%114%34%32%5%
573
September1st to 15thNight
14%317%29%28%6%
663
16th to endNight
12%416%31%28%6%
717
October1st to 15thNight
19%5%23%30%17%3
720
16th to endNight
26%10%32%24%5%
708
November1st to 15thNight
18%9%30%27%12%1
700
16th to endNight
27%11%30%21%8%
720
December1st to 15thNight
25%12%34%22%4
750
16th to endNight
29%10%35%20%3
960
Page generated at 2017-10-17 16:35:30. Version ac04

Copyright 2017 A. Danko


GM Milford Proving Ground Softball Fields Clear Sky Chart |Charts Home