Butter Pot Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Butter Pot Park clear sky chart from 2005-11-06 to 2024-01-12.

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
18%
23647
8%
74863
3%
23581
23%
23581
9%
60150

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
8%
850
7%
2839
2%
847
14%
847
5%
2402
January11th to 20thNight
10%
809
7%
2564
1%
809
16%
809
6%
2151
January21st to endNight
12%
880
10%
2772
2%
880
19%
880
8%
2269
February1st to 10thNight
9%
800
6%
2378
1%
800
14%
800
6%
2002
February11th to 20thNight
8%
778
7%
2271
1%
775
13%
775
7%
1918
February21st to endNight
12%
592
9%
1776
2%
592
18%
592
9%
1450
March1st to 10thNight
12%
698
10%
2138
3%
698
18%
698
8%
1733
March11th to 20thNight
20%
540
10%
1980
5%
540
28%
540
9%
1506
March21st to endNight
11%
594
7%
2178
4%
594
18%
594
6%
1820
April1st to 10thNight
16%
540
9%
1790
3%
540
24%
540
8%
1438
April11th to 20thNight
16%
534
9%
1598
4%
534
24%
534
11%
1272
April21st to endNight
15%
540
9%
1620
4%
540
22%
540
9%
1329
May1st to 10thNight
20%
540
7%
1620
2%
540
24%
540
9%
1337
May11th to 20thNight
24%
532
9%
1415
2%
532
27%
532
14%
1130
May21st to endNight
21%
583
8%
1357
1%
582
23%
582
13%
1138
June1st to 10thNight
21%
540
5%
1260
1%
540
23%
540
10%
1089
June11th to 20thNight
27%
540
4%
1260
2%
540
28%
540
14%
1049
June21st to endNight
25%
540
5%
1260
2%
540
27%
540
17%
1018
July1st to 10thNight
27%
526
7%
1226
2%
526
30%
526
17%
988
July11th to 20thNight
27%
522
6%
1226
1%
522
29%
522
16%
1005
July21st to endNight
28%
590
7%
1486
2%
558
29%
558
13%
1203
August1st to 10thNight
32%
538
7%
1565
3%
534
35%
534
14%
1226
August11th to 20thNight
30%
532
9%
1595
7%
532
33%
532
14%
1235
August21st to endNight
33%
594
11%
1782
9%
594
38%
594
17%
1326
September1st to 10thNight
33%
540
10%
1804
8%
540
39%
540
16%
1295
September11th to 20thNight
26%
540
10%
1980
8%
540
31%
540
12%
1459
September21st to endNight
28%
540
13%
1980
7%
540
36%
540
14%
1399
October1st to 10thNight
23%
589
13%
2076
5%
589
32%
589
13%
1523
October11th to 20thNight
19%
656
11%
2186
4%
656
27%
656
10%
1718
October21st to endNight
18%
891
9%
2574
3%
891
23%
891
10%
2102
November1st to 10thNight
18%
830
7%
2438
2%
830
22%
830
11%
1949
November11th to 20thNight
17%
850
8%
2660
2%
850
23%
850
9%
2155
November21st to endNight
13%
850
9%
2689
2%
850
20%
850
9%
2129
December1st to 10thNight
12%
850
7%
2850
2%
850
18%
850
7%
2368
December11th to 20thNight
8%
850
4%
3512
1%
849
13%
849
4%
3015
December21st to endNight
14%
929
4%
5158
3%
907
20%
907
4%
4004

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
19%14%6%9%7%45%5%5%6%20%
74612
Night
19%15%6%9%7%45%5%5%6%19%
75108
TransparencyDay
64%6%10%13%6%1
74304
Night
64%7%10%12%6%
74951
SeeingDay
27%17%30%19%7%1
16963
Night
27%16%32%20%5%
23654

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 10thDay
18%17%10%13%6%46%5%45%12%
1326
11th to 20thDay
17%16%7%13%9%45%446%15%
1432
21st to endDay
18%16%8%15%7%445%5%6%12%
1584
February1st to 10thDay
17%14%6%13%11%6%6%5%45%13%
1580
11th to 20thDay
18%16%7%12%8%46%5%5%6%12%
1577
21st to endDay
14%14%10%14%9%5%6%5%45%14%
1480
March1st to 10thDay
16%17%8%12%10%6%6%335%15%
1817
11th to 20thDay
14%14%9%12%8%46%5%5%417%
1980
21st to endDay
22%20%8%11%7%24335%14%
2178
April1st to 10thDay
16%17%9%12%9%45%34416%
2165
11th to 20thDay
20%21%6%8%6%35%445%19%
2311
21st to endDay
21%20%6%7%6%34445%20%
2340
May1st to 10thDay
21%18%6%8%6%34446%20%
2340
11th to 20thDay
20%16%49%6%445%46%22%
2474
21st to endDay
19%14%5%7%6%45%5%6%7%22%
2918
June1st to 10thDay
27%15%5%7%7%45%445%16%
2700
11th to 20thDay
24%13%37%6%35%5%5%6%22%
2700
21st to endDay
21%10%48%7%45%5%6%7%23%
2700
July1st to 10thDay
17%11%47%6%35%6%6%7%29%
2700
11th to 20thDay
16%9%48%8%5%6%7%7%7%24%
2688
21st to endDay
20%9%47%8%47%5%6%7%22%
2745
August1st to 10thDay
24%9%38%6%46%5%5%8%22%
2362
11th to 20thDay
18%10%48%8%45%6%5%7%24%
2305
21st to endDay
18%10%49%6%45%6%6%8%25%
2574
September1st to 10thDay
18%9%47%6%35%5%5%8%29%
2153
11th to 20thDay
21%9%37%5%445%5%6%30%
1980
21st to endDay
15%9%47%6%35%47%9%32%
1980
October1st to 10thDay
22%10%37%6%45%5%5%7%27%
1883
11th to 20thDay
23%14%48%7%445%45%21%
1773
21st to endDay
22%18%5%8%7%445%5%6%16%
1782
November1st to 10thDay
16%16%5%9%7%45%446%23%
1638
11th to 20thDay
18%17%6%7%8%45%5%5%7%17%
1520
21st to endDay
20%19%8%9%6%26%445%17%
1487
December1st to 10thDay
20%18%7%11%6%35%446%15%
1330
11th to 20thDay
15%23%8%11%7%33445%15%
1668
21st to endDay
16%21%8%11%9%45%5%5%412%
2442
January1st to 10thNight
17%17%9%13%8%5%5%445%12%
2839
11th to 20thNight
18%15%8%11%8%5%6%445%14%
2564
21st to endNight
16%14%9%12%9%5%5%45%6%15%
2772
February1st to 10thNight
18%13%6%14%11%45%5%5%5%14%
2378
11th to 20thNight
20%14%7%12%9%5%6%45%5%14%
2267
21st to endNight
13%14%10%13%9%6%6%345%16%
1776
March1st to 10thNight
16%13%7%12%9%5%6%5%5%5%18%
2130
11th to 20thNight
13%14%7%11%8%46%6%5%6%20%
1979
21st to endNight
24%17%10%11%6%35%43315%
2178
April1st to 10thNight
20%16%8%9%6%44446%19%
1790
11th to 20thNight
22%17%6%7%5%3444423%
1598
21st to endNight
22%20%5%8%6%34335%21%
1620
May1st to 10thNight
24%16%6%8%6%36%45%6%17%
1620
11th to 20thNight
22%14%46%6%345%5%7%24%
1414
21st to endNight
25%12%46%7%45%5%5%7%20%
1356
June1st to 10thNight
25%15%48%7%46%445%19%
1260
11th to 20thNight
24%11%37%6%46%6%6%8%20%
1260
21st to endNight
21%12%5%7%6%345%7%9%21%
1260
July1st to 10thNight
19%10%37%7%35%6%7%10%23%
1260
11th to 20thNight
19%10%47%8%46%6%6%7%22%
1268
21st to endNight
22%9%48%6%45%6%5%8%23%
1573
August1st to 10thNight
22%8%36%6%45%6%7%8%24%
1576
11th to 20thNight
19%12%48%6%35%5%5%8%24%
1595
21st to endNight
22%9%35%6%345%6%8%28%
1782
September1st to 10thNight
18%9%36%6%5%5%6%6%8%28%
1804
11th to 20thNight
22%12%46%5%3445%7%27%
1980
21st to endNight
19%11%47%5%35%447%31%
1980
October1st to 10thNight
21%11%47%6%35%46%6%26%
2076
11th to 20thNight
22%14%48%7%3445%6%21%
2186
21st to endNight
23%17%47%6%35%5%45%20%
2574
November1st to 10thNight
19%15%5%8%6%35%5%5%6%22%
2438
11th to 20thNight
19%15%6%9%7%35%5%5%7%19%
2660
21st to endNight
16%17%6%10%7%35%6%6%6%19%
2689
December1st to 10thNight
18%18%7%11%7%45%5%5%5%16%
2850
11th to 20thNight
19%21%8%13%8%35%5%4411%
3531
21st to endNight
18%19%8%10%6%35%445%18%
5225

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
73%6%8%8%5%
1327
11th to 20thDay
69%5%9%10%5%1
1432
21st to endDay
73%47%8%7%1
1584
February1st to 10thDay
71%7%8%7%7%1
1580
11th to 20thDay
71%6%9%9%41
1584
21st to endDay
70%411%7%7%2
1480
March1st to 10thDay
70%6%7%10%6%1
1822
11th to 20thDay
68%6%9%11%6%
1980
21st to endDay
74%48%9%42
2178
April1st to 10thDay
72%5%6%10%6%1
2165
11th to 20thDay
68%5%8%10%8%1
2311
21st to endDay
68%5%8%10%9%1
2340
May1st to 10thDay
65%7%8%12%7%1
2340
11th to 20thDay
65%5%10%13%6%1
2478
21st to endDay
59%8%11%15%7%
2918
June1st to 10thDay
72%5%7%12%41
2700
11th to 20thDay
63%7%11%12%6%
2700
21st to endDay
61%9%10%16%5%
2700
July1st to 10thDay
53%9%12%19%8%
2625
11th to 20thDay
57%9%14%16%6%
2606
21st to endDay
59%9%13%15%4
2592
August1st to 10thDay
60%8%10%17%5%
2348
11th to 20thDay
58%9%11%15%6%1
2305
21st to endDay
57%8%13%18%4
2574
September1st to 10thDay
52%6%12%21%8%
2153
11th to 20thDay
55%5%11%18%11%1
1980
21st to endDay
49%7%15%20%8%1
1980
October1st to 10thDay
57%6%12%16%8%1
1883
11th to 20thDay
66%6%9%13%6%
1773
21st to endDay
68%6%8%12%5%1
1782
November1st to 10thDay
62%6%15%12%5%
1638
11th to 20thDay
66%7%9%12%6%1
1520
21st to endDay
69%6%10%9%5%
1487
December1st to 10thDay
70%7%8%11%5%
1330
11th to 20thDay
71%5%10%8%5%
1667
21st to endDay
72%6%9%10%3
2442
January1st to 10thNight
72%6%7%8%6%1
2839
11th to 20thNight
69%7%9%9%6%
2564
21st to endNight
68%6%10%10%6%
2772
February1st to 10thNight
70%6%9%9%5%1
2378
11th to 20thNight
69%7%9%11%4
2271
21st to endNight
67%5%10%10%6%1
1776
March1st to 10thNight
65%7%9%11%8%1
2138
11th to 20thNight
60%7%13%12%7%1
1980
21st to endNight
73%47%8%6%1
2178
April1st to 10thNight
66%5%8%11%8%1
1790
11th to 20thNight
65%5%8%13%9%1
1598
21st to endNight
70%37%11%8%1
1620
May1st to 10thNight
67%6%8%12%6%
1620
11th to 20thNight
60%8%7%18%7%
1415
21st to endNight
63%8%10%13%5%
1357
June1st to 10thNight
70%7%6%12%5%
1260
11th to 20thNight
62%9%12%12%5%
1260
21st to endNight
60%7%12%16%4
1260
July1st to 10thNight
56%9%13%15%7%
1226
11th to 20thNight
59%9%13%13%5%
1226
21st to endNight
61%8%10%16%4
1486
August1st to 10thNight
56%11%13%15%41
1565
11th to 20thNight
58%8%12%15%7%
1595
21st to endNight
53%8%14%20%5%
1782
September1st to 10thNight
51%8%13%20%7%1
1804
11th to 20thNight
58%6%12%14%9%1
1980
21st to endNight
54%6%12%19%8%
1980
October1st to 10thNight
57%6%12%18%6%
2076
11th to 20thNight
63%6%12%13%6%
2186
21st to endNight
66%6%10%11%7%1
2574
November1st to 10thNight
62%7%14%11%6%
2438
11th to 20thNight
65%7%11%12%5%1
2660
21st to endNight
63%6%13%11%6%1
2689
December1st to 10thNight
69%6%7%12%5%
2850
11th to 20thNight
75%5%8%7%5%
3533
21st to endNight
64%8%11%13%4
5225

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%24%32%13%31
370
11th to 20thDay
27%24%32%13%41
346
21st to endDay
27%21%34%16%2
374
February1st to 10thDay
25%26%29%16%4
340
11th to 20thDay
27%29%32%10%2
336
21st to endDay
18%28%35%16%3
280
March1st to 10thDay
25%28%33%10%4
340
11th to 20thDay
24%23%30%17%33
340
21st to endDay
30%22%30%12%6%1
374
April1st to 10thDay
27%25%30%13%5%1
443
11th to 20thDay
32%20%28%13%7%1
589
21st to endDay
29%18%30%18%5%1
600
May1st to 10thDay
30%20%25%16%7%1
603
11th to 20thDay
24%13%35%19%7%1
624
21st to endDay
27%13%33%20%6%1
680
June1st to 10thDay
38%11%27%17%6%1
630
11th to 20thDay
30%11%30%20%6%2
630
21st to endDay
26%8%29%27%9%2
630
July1st to 10thDay
23%9%36%23%8%1
620
11th to 20thDay
23%7%33%26%10%1
618
21st to endDay
26%8%28%27%10%1
685
August1st to 10thDay
23%8%31%26%10%2
625
11th to 20thDay
23%10%26%29%11%1
617
21st to endDay
24%11%25%27%13%1
693
September1st to 10thDay
22%9%30%26%11%2
488
11th to 20thDay
26%15%29%22%6%1
360
21st to endDay
21%14%35%21%8%1
360
October1st to 10thDay
25%13%35%21%6%
360
11th to 20thDay
28%16%28%18%9%2
360
21st to endDay
28%23%26%17%42
396
November1st to 10thDay
26%22%29%16%5%1
365
11th to 20thDay
29%22%26%15%7%
370
21st to endDay
28%26%28%12%41
370
December1st to 10thDay
28%21%30%15%6%
370
11th to 20thDay
28%31%25%13%2
370
21st to endDay
25%24%32%15%31
407
January1st to 10thNight
26%22%34%14%4
850
11th to 20thNight
27%19%35%15%3
809
21st to endNight
25%21%34%18%2
880
February1st to 10thNight
25%26%33%14%1
800
11th to 20thNight
28%22%35%12%2
779
21st to endNight
22%19%35%19%5%
592
March1st to 10thNight
24%22%34%16%3
698
11th to 20thNight
20%20%31%22%6%
540
21st to endNight
31%15%32%18%2
594
April1st to 10thNight
27%20%29%16%6%1
540
11th to 20thNight
32%15%31%17%5%
534
21st to endNight
29%16%33%17%5%1
540
May1st to 10thNight
31%10%30%20%8%1
540
11th to 20thNight
28%10%33%21%8%1
532
21st to endNight
28%11%33%22%41
583
June1st to 10thNight
34%8%29%20%7%1
540
11th to 20thNight
28%9%30%24%9%1
540
21st to endNight
28%9%30%24%8%1
540
July1st to 10thNight
23%7%37%26%6%1
526
11th to 20thNight
25%6%35%27%7%
522
21st to endNight
25%7%32%28%8%
590
August1st to 10thNight
25%5%30%30%10%1
538
11th to 20thNight
26%6%31%29%8%1
532
21st to endNight
25%9%28%29%9%
594
September1st to 10thNight
20%7%34%29%9%1
540
11th to 20thNight
26%13%29%25%7%1
540
21st to endNight
26%10%32%25%7%1
540
October1st to 10thNight
26%11%34%23%6%
589
11th to 20thNight
28%14%31%19%7%1
656
21st to endNight
31%18%27%19%5%
891
November1st to 10thNight
27%20%31%18%4
830
11th to 20thNight
27%19%29%20%5%
850
21st to endNight
25%23%33%15%4
850
December1st to 10thNight
26%22%31%16%6%
850
11th to 20thNight
31%25%30%10%3
850
21st to endNight
24%20%32%18%41
935
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