Mambourg Farm Historical Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mambourg Farm Historical Park clear sky chart from 2005-11-06 to 2024-02-10.

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
37%
24004
16%
79963
11%
23897
44%
23897
19%
55659

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
15%
754
11%
4075
5%
737
24%
737
5%
3220
January11th to 20thNight
14%
758
9%
4083
4%
740
22%
740
5%
3276
January21st to endNight
17%
832
7%
4512
7%
814
24%
814
6%
3735
February1st to 10thNight
21%
759
13%
2464
8%
759
28%
759
13%
1839
February11th to 20thNight
17%
700
12%
2135
5%
700
24%
700
12%
1612
February21st to endNight
13%
592
13%
1776
4%
592
23%
592
12%
1367
March1st to 10thNight
23%
720
17%
2060
9%
720
31%
720
18%
1457
March11th to 20thNight
25%
720
18%
1980
9%
720
33%
720
20%
1385
March21st to endNight
25%
792
17%
2178
8%
792
33%
792
19%
1565
April1st to 10thNight
25%
720
16%
1980
6%
720
33%
720
23%
1337
April11th to 20thNight
32%
540
21%
1630
10%
540
42%
540
23%
1077
April21st to endNight
26%
540
19%
1620
6%
540
36%
540
22%
1077
May1st to 10thNight
34%
540
14%
1620
7%
540
39%
540
19%
1151
May11th to 20thNight
40%
531
16%
1593
9%
531
46%
531
22%
1092
May21st to endNight
56%
583
16%
1745
11%
582
61%
582
31%
1071
June1st to 10thNight
51%
540
16%
1620
12%
540
57%
540
30%
1012
June11th to 20thNight
57%
540
18%
1620
13%
540
63%
540
33%
989
June21st to endNight
56%
540
17%
1620
13%
540
62%
540
33%
992
July1st to 10thNight
60%
525
15%
1575
14%
525
62%
525
32%
973
July11th to 20thNight
64%
522
18%
1566
15%
522
67%
522
33%
936
July21st to endNight
63%
591
17%
1672
14%
558
65%
558
30%
1055
August1st to 10thNight
66%
537
20%
1600
15%
534
68%
534
33%
959
August11th to 20thNight
66%
534
22%
1598
18%
534
69%
534
31%
1003
August21st to endNight
67%
594
26%
1790
21%
594
70%
594
38%
1013
September1st to 10thNight
60%
716
23%
1976
16%
716
63%
716
36%
1200
September11th to 20thNight
66%
720
29%
1980
22%
720
70%
720
40%
1158
September21st to endNight
49%
720
26%
1980
19%
720
55%
720
32%
1250
October1st to 10thNight
52%
720
24%
2047
20%
720
58%
720
34%
1250
October11th to 20thNight
38%
720
22%
2160
16%
720
47%
720
26%
1384
October21st to endNight
32%
792
22%
2394
16%
792
40%
792
21%
1640
November1st to 10thNight
41%
740
24%
2406
20%
740
49%
740
27%
1430
November11th to 20thNight
29%
760
20%
2470
11%
760
40%
760
18%
1665
November21st to endNight
28%
760
17%
2470
11%
760
36%
760
16%
1773
December1st to 10thNight
20%
760
11%
2470
7%
760
26%
760
11%
1896
December11th to 20thNight
23%
759
13%
2997
7%
758
31%
758
11%
2181
December21st to endNight
17%
833
7%
4501
5%
817
23%
817
5%
3639

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
15%10%47%6%35%5%5%7%32%
78642
Night
15%10%47%6%3445%7%34%
80336
TransparencyDay
50%6%11%20%11%2
78365
Night
49%6%11%20%12%2
80132
SeeingDay
21%14%27%21%12%5%
13846
Night
19%11%27%28%14%2
24024

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
18%20%6%10%5%3445%6%19%
2836
11th to 20thDay
15%20%8%12%9%6%5%33416%
2840
21st to endDay
27%19%8%8%7%3443413%
3124
February1st to 10thDay
22%13%6%8%7%34346%25%
1701
11th to 20thDay
17%13%7%11%6%35%446%24%
1709
21st to endDay
19%14%6%8%5%33345%30%
1480
March1st to 10thDay
18%11%6%6%5%3445%6%32%
1898
11th to 20thDay
19%11%49%6%345%5%6%28%
1980
21st to endDay
21%10%5%7%6%345%46%29%
2178
April1st to 10thDay
13%12%47%6%35%446%34%
1988
11th to 20thDay
17%9%36%5%3446%7%36%
2284
21st to endDay
19%7%37%6%45%5%6%6%32%
2340
May1st to 10thDay
18%9%46%6%4446%7%30%
2340
11th to 20thDay
21%7%46%6%35%45%8%31%
2301
21st to endDay
8%5%36%6%46%7%7%11%38%
2531
June1st to 10thDay
12%6%36%6%35%6%6%10%38%
2340
11th to 20thDay
11%6%36%6%46%6%7%10%37%
2340
21st to endDay
11%5%36%6%36%6%6%10%36%
2340
July1st to 10thDay
12%6%35%7%46%5%6%10%37%
2340
11th to 20thDay
9%6%36%6%46%6%7%9%38%
2340
21st to endDay
10%5%35%6%47%6%7%9%37%
2547
August1st to 10thDay
9%5%36%6%46%6%8%11%37%
2327
11th to 20thDay
9%7%36%6%46%7%9%10%35%
2303
21st to endDay
8%5%25%5%45%5%6%11%43%
2545
September1st to 10thDay
14%6%2443446%7%45%
1980
11th to 20thDay
10%425%5%4445%8%48%
1980
21st to endDay
16%7%36%5%33347%43%
1980
October1st to 10thDay
13%7%26%5%345%6%7%42%
1913
11th to 20thDay
15%7%26%5%35%45%6%42%
1800
21st to endDay
22%8%37%6%24445%35%
1958
November1st to 10thDay
10%7%36%433447%49%
1672
11th to 20thDay
16%12%5%6%43435%6%35%
1710
21st to endDay
18%12%5%7%5%44447%31%
1710
December1st to 10thDay
21%15%8%10%6%35%445%20%
1710
11th to 20thDay
18%16%6%11%6%3445%6%22%
2153
21st to endDay
20%22%7%9%7%45%445%13%
3124
January1st to 10thNight
15%18%7%11%7%4444420%
4109
11th to 20thNight
15%16%6%15%7%46%5%4417%
4120
21st to endNight
26%16%9%9%8%3333317%
4532
February1st to 10thNight
20%14%48%6%34445%29%
2464
11th to 20thNight
19%12%49%8%45%446%26%
2134
21st to endNight
21%13%7%8%5%3435%427%
1776
March1st to 10thNight
17%9%37%7%45%445%36%
2060
11th to 20thNight
18%10%35%5%345%5%6%36%
1980
21st to endNight
20%9%47%5%34447%34%
2178
April1st to 10thNight
14%9%35%6%2446%7%39%
1980
11th to 20thNight
14%7%37%4445%6%9%38%
1630
21st to endNight
15%7%36%5%445%6%7%37%
1620
May1st to 10thNight
17%8%36%5%37%5%6%8%32%
1620
11th to 20thNight
16%8%45%435%5%48%38%
1592
21st to endNight
6%427%6%35%6%8%11%42%
1744
June1st to 10thNight
8%5%25%6%35%46%8%46%
1620
11th to 20thNight
9%425%5%35%48%11%44%
1620
21st to endNight
10%5%244346%7%9%45%
1620
July1st to 10thNight
9%5%35%5%345%6%8%47%
1620
11th to 20thNight
6%5%245%345%8%10%46%
1620
21st to endNight
7%5%36%6%46%6%8%9%41%
1771
August1st to 10thNight
5%5%26%6%45%5%7%10%44%
1611
11th to 20thNight
6%6%27%6%45%5%7%8%45%
1598
21st to endNight
7%4244345%7%9%52%
1790
September1st to 10thNight
13%42443445%8%50%
1976
11th to 20thNight
9%32432445%8%54%
1980
21st to endNight
13%7%35%33335%6%49%
1980
October1st to 10thNight
11%5%25%43446%7%48%
2047
11th to 20thNight
15%7%35%5%2445%7%43%
2160
21st to endNight
20%8%25%5%3445%6%37%
2394
November1st to 10thNight
14%6%25%433446%48%
2406
11th to 20thNight
16%9%37%6%345%5%6%36%
2470
21st to endNight
19%11%47%5%35%45%6%30%
2470
December1st to 10thNight
21%14%6%8%6%3445%6%24%
2470
11th to 20thNight
18%13%8%7%5%2435%7%27%
3042
21st to endNight
21%19%8%9%7%4445%5%16%
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
65%5%10%13%5%
2837
11th to 20thDay
71%7%8%11%4
2840
21st to endDay
75%5%7%9%31
3124
February1st to 10thDay
62%412%13%9%
1701
11th to 20thDay
62%5%9%16%8%
1719
21st to endDay
59%410%18%8%2
1480
March1st to 10thDay
53%5%10%24%7%1
1898
11th to 20thDay
56%5%10%19%9%1
1980
21st to endDay
57%5%9%19%9%1
2178
April1st to 10thDay
51%5%10%20%11%2
1988
11th to 20thDay
47%5%11%18%14%4
2284
21st to endDay
51%6%9%21%10%2
2340
May1st to 10thDay
53%5%11%20%9%2
2340
11th to 20thDay
51%7%11%18%11%1
2305
21st to endDay
37%11%16%22%13%1
2531
June1st to 10thDay
40%8%11%24%15%2
2340
11th to 20thDay
41%9%13%21%15%1
2340
21st to endDay
41%8%14%20%14%2
2340
July1st to 10thDay
43%8%13%20%15%1
2275
11th to 20thDay
39%9%13%23%15%1
2271
21st to endDay
39%8%14%23%14%3
2405
August1st to 10thDay
38%9%14%26%12%1
2314
11th to 20thDay
40%8%15%26%10%1
2303
21st to endDay
35%8%14%23%15%5%
2545
September1st to 10thDay
38%7%10%21%21%3
1980
11th to 20thDay
34%5%12%26%20%2
1980
21st to endDay
43%49%23%20%1
1980
October1st to 10thDay
40%6%11%23%19%1
1913
11th to 20thDay
42%5%11%24%17%1
1800
21st to endDay
51%310%23%11%2
1958
November1st to 10thDay
36%5%9%29%17%3
1672
11th to 20thDay
50%5%9%20%13%3
1710
21st to endDay
53%5%11%19%11%1
1710
December1st to 10thDay
67%49%15%4
1710
11th to 20thDay
63%49%17%7%
2150
21st to endDay
73%6%10%9%3
3124
January1st to 10thNight
68%48%14%5%
4109
11th to 20thNight
69%5%10%12%3
4120
21st to endNight
73%36%13%31
4532
February1st to 10thNight
58%5%10%18%8%1
2464
11th to 20thNight
60%49%17%9%1
2135
21st to endNight
61%5%9%16%8%2
1776
March1st to 10thNight
50%5%8%24%12%1
2060
11th to 20thNight
49%5%11%23%10%2
1980
21st to endNight
51%5%8%21%13%2
2178
April1st to 10thNight
44%6%12%21%15%2
1980
11th to 20thNight
43%6%11%17%19%4
1630
21st to endNight
45%5%11%23%14%2
1620
May1st to 10thNight
49%7%12%19%10%3
1620
11th to 20thNight
45%8%11%21%13%3
1593
21st to endNight
33%9%18%25%13%2
1745
June1st to 10thNight
35%8%11%23%20%2
1620
11th to 20thNight
32%9%16%25%17%2
1620
21st to endNight
33%8%14%25%17%3
1620
July1st to 10thNight
35%7%13%22%20%3
1575
11th to 20thNight
31%9%13%26%18%3
1566
21st to endNight
35%9%13%26%15%2
1672
August1st to 10thNight
33%7%15%28%15%1
1600
11th to 20thNight
35%8%15%23%19%1
1598
21st to endNight
28%7%13%28%19%5%
1790
September1st to 10thNight
33%5%12%24%19%6%
1976
11th to 20thNight
28%6%11%27%24%3
1980
21st to endNight
37%5%10%21%26%1
1980
October1st to 10thNight
34%6%11%26%21%3
2047
11th to 20thNight
41%5%9%25%17%2
2160
21st to endNight
48%5%9%23%13%2
2394
November1st to 10thNight
37%411%25%19%4
2406
11th to 20thNight
48%5%9%20%15%2
2470
21st to endNight
54%411%19%9%1
2470
December1st to 10thNight
61%5%9%18%6%1
2470
11th to 20thNight
58%5%10%21%6%
3044
21st to endNight
70%5%9%13%3
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
27%27%33%10%3
270
11th to 20thDay
31%24%34%8%1
270
21st to endDay
34%25%29%9%3
297
February1st to 10thDay
33%24%30%12%2
267
11th to 20thDay
37%32%24%7%1
240
21st to endDay
33%29%32%5%1
198
March1st to 10thDay
28%24%31%14%3
338
11th to 20thDay
30%19%32%13%6%
420
21st to endDay
33%16%32%15%4
462
April1st to 10thDay
24%18%32%16%8%2
420
11th to 20thDay
27%16%28%17%8%3
412
21st to endDay
25%20%31%16%6%2
420
May1st to 10thDay
28%20%26%16%7%3
423
11th to 20thDay
21%13%32%21%8%4
447
21st to endDay
12%9%26%27%19%7%
485
June1st to 10thDay
13%8%29%29%14%6%
450
11th to 20thDay
15%9%26%28%15%6%
450
21st to endDay
14%7%29%28%16%6%
450
July1st to 10thDay
15%417%24%22%18%
445
11th to 20thDay
11%5%22%28%23%11%
444
21st to endDay
13%420%28%23%12%
488
August1st to 10thDay
11%5%18%30%24%13%
446
11th to 20thDay
13%6%21%29%19%11%
439
21st to endDay
9%5%19%31%25%10%
495
September1st to 10thDay
14%6%20%24%24%11%
450
11th to 20thDay
11%316%27%31%12%
450
21st to endDay
22%8%20%27%18%4
450
October1st to 10thDay
13%7%30%28%16%5%
450
11th to 20thDay
19%15%31%22%12%2
450
21st to endDay
28%17%30%17%7%
473
November1st to 10thDay
17%20%33%20%7%2
270
11th to 20thDay
30%18%27%17%7%1
270
21st to endDay
25%23%34%16%3
270
December1st to 10thDay
29%22%31%14%31
270
11th to 20thDay
25%27%34%11%3
270
21st to endDay
33%21%31%12%2
297
January1st to 10thNight
25%22%31%18%4
760
11th to 20thNight
28%20%31%19%2
760
21st to endNight
27%17%33%21%2
836
February1st to 10thNight
28%15%31%24%2
759
11th to 20thNight
28%19%32%19%1
703
21st to endNight
29%15%36%18%2
592
March1st to 10thNight
24%15%33%23%4
720
11th to 20thNight
21%18%32%21%7%1
720
21st to endNight
25%16%29%23%7%1
792
April1st to 10thNight
19%16%35%23%6%
720
11th to 20thNight
18%12%35%23%11%1
540
21st to endNight
19%9%40%25%6%1
540
May1st to 10thNight
20%10%32%25%12%1
540
11th to 20thNight
21%5%28%31%14%1
531
21st to endNight
8%5%23%34%27%3
584
June1st to 10thNight
11%325%39%20%1
540
11th to 20thNight
10%324%40%21%1
540
21st to endNight
11%423%38%22%2
540
July1st to 10thNight
10%317%34%28%7%
525
11th to 20thNight
7%216%38%30%7%
522
21st to endNight
10%315%36%35%2
591
August1st to 10thNight
7%213%40%35%3
537
11th to 20thNight
8%215%38%31%5%
534
21st to endNight
9%218%31%34%7%
594
September1st to 10thNight
14%416%34%27%5%
716
11th to 20thNight
11%313%35%32%5%
720
21st to endNight
15%7%22%32%21%3
720
October1st to 10thNight
13%5%25%33%21%3
720
11th to 20thNight
19%11%28%30%11%1
720
21st to endNight
25%12%27%27%9%
792
November1st to 10thNight
18%13%25%29%15%1
740
11th to 20thNight
21%17%27%24%9%1
760
21st to endNight
25%14%28%26%6%1
760
December1st to 10thNight
30%16%26%22%4
760
11th to 20thNight
25%16%31%23%4
760
21st to endNight
29%17%29%23%2
836
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