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Buffalo
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Buffalo clear sky chart from 2005-11-05 to 2019-07-11.

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
26%
17175
12%
54180
7%
17138
32%
17138
13%
39631

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
9%
836
7%
2884
3%
836
13%
836
4%
2460
January16th to endNight
9%
896
6%
2912
1%
896
14%
896
4%
2456
February1st to 15thNight
10%
824
5%
2677
2%
821
15%
821
5%
2266
February16th to endNight
13%
735
7%
2333
2%
735
19%
735
8%
1892
March1st to 15thNight
18%
840
12%
2310
6%
840
23%
840
11%
1815
March16th to endNight
24%
896
17%
2464
7%
896
33%
896
18%
1777
April1st to 15thNight
20%
838
13%
2108
5%
838
24%
838
15%
1627
April16th to endNight
28%
691
18%
1937
6%
691
37%
691
21%
1315
May1st to 15thNight
31%
571
15%
1831
8%
571
39%
571
14%
1266
May16th to endNight
36%
438
15%
1753
11%
438
47%
438
18%
1047
June1st to 15thNight
32%
420
14%
1680
11%
420
46%
420
16%
1060
June16th to endNight
35%
420
12%
1680
10%
420
45%
420
18%
1020
July1st to 15thNight
49%
392
18%
1568
23%
392
55%
392
26%
842
July16th to endNight
42%
533
15%
1662
11%
502
53%
502
26%
986
August1st to 15thNight
52%
575
16%
1715
11%
572
57%
572
28%
1048
August16th to endNight
52%
705
21%
1947
11%
705
56%
705
33%
1211
September1st to 15thNight
48%
780
22%
1950
12%
780
52%
780
31%
1291
September16th to endNight
48%
777
22%
2173
16%
777
51%
777
28%
1386
October1st to 15thNight
32%
780
16%
2340
12%
780
38%
780
18%
1624
October16th to endNight
18%
832
10%
2496
5%
832
24%
832
11%
1903
November1st to 15thNight
28%
820
16%
2744
14%
820
33%
820
15%
1906
November16th to endNight
16%
840
10%
2940
4%
840
23%
840
8%
2278
December1st to 15thNight
12%
840
6%
2940
2%
840
16%
840
4%
2446
December16th to endNight
8%
896
4%
3136
1%
896
13%
896
4%
2709

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
16%10%37%6%35%45%7%30%
55020
Night
17%10%47%6%34446%29%
54360
Cloud CoverDay
17%10%37%5%3445%6%30%
55030
Night
18%11%47%5%34446%29%
54364
TransparencyDay
53%5%12%18%9%
54718
Night
54%5%11%17%9%1
54180
SeeingDay
21%20%25%18%9%3
7669
Night
20%24%22%21%9%1
17180

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
18%18%6%11%9%45%435%13%
1711
16th to endDay
14%18%7%13%10%5%6%44411%
2016
February1st to 15thDay
18%17%7%13%8%46%33411%
1845
16th to endDay
18%14%6%12%8%45%435%16%
1708
March1st to 15thDay
17%15%5%9%8%34345%20%
2299
16th to endDay
16%12%45%6%34346%30%
2464
April1st to 15thDay
21%12%46%5%25%435%28%
2499
16th to endDay
20%9%25%433435%37%
2638
May1st to 15thDay
18%7%36%5%35%45%7%33%
2780
16th to endDay
13%6%25%42446%8%40%
3066
June1st to 15thDay
17%6%25%43446%7%36%
2940
16th to endDay
14%42443446%10%39%
2940
July1st to 15thDay
8%425%425%5%6%9%45%
2874
16th to endDay
11%425%5%36%6%7%10%35%
2751
August1st to 15thDay
10%5%246%35%5%7%10%37%
2487
16th to endDay
11%4245%245%6%8%41%
2594
September1st to 15thDay
17%6%25%43445%7%39%
2340
16th to endDay
13%5%245%45%5%6%7%39%
2115
October1st to 15thDay
23%7%36%5%3445%6%31%
1950
16th to endDay
25%12%46%5%34445%22%
2080
November1st to 15thDay
16%12%47%6%35%447%28%
1771
16th to endDay
22%14%48%6%34445%21%
1680
December1st to 15thDay
20%20%6%8%7%34445%14%
1680
16th to endDay
20%22%7%12%7%443449%
1792
January1st to 15thNight
21%18%6%11%7%3433315%
2884
16th to endNight
17%18%7%11%8%35%34414%
2912
February1st to 15thNight
19%17%8%11%7%35%33415%
2675
16th to endNight
18%15%5%11%8%35%345%17%
2333
March1st to 15thNight
18%12%5%9%6%25%345%25%
2298
16th to endNight
16%11%46%434345%35%
2464
April1st to 15thNight
22%11%36%5%2445%5%28%
2108
16th to endNight
17%5%25%5%25%5%36%40%
1937
May1st to 15thNight
18%6%36%5%35%5%6%7%32%
1831
16th to endNight
12%5%25%435%5%6%8%41%
1751
June1st to 15thNight
14%6%25%6%35%5%5%6%38%
1680
16th to endNight
13%5%245%35%46%7%41%
1680
July1st to 15thNight
6%5%35%42436%8%49%
1648
16th to endNight
9%424435%5%7%7%45%
1767
August1st to 15thNight
9%5%146%3446%9%44%
1726
16th to endNight
9%4144345%5%8%47%
1947
September1st to 15thNight
15%6%24313448%43%
1950
16th to endNight
15%5%1442445%6%45%
2173
October1st to 15thNight
20%7%25%5%34346%36%
2340
16th to endNight
27%8%36%5%4445%6%25%
2496
November1st to 15thNight
19%8%36%5%24346%34%
2744
16th to endNight
19%13%48%6%35%5%45%22%
2940
December1st to 15thNight
20%20%6%8%7%3434415%
2940
16th to endNight
22%17%7%10%7%35%44411%
3136

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
19%18%6%11%9%45%33413%
1711
16th to endDay
14%18%7%13%10%5%6%43410%
2016
February1st to 15thDay
19%17%7%14%7%5%5%43411%
1845
16th to endDay
19%14%6%11%9%44336%16%
1708
March1st to 15thDay
17%16%5%10%7%35%44420%
2310
16th to endDay
17%11%46%5%3435%6%30%
2463
April1st to 15thDay
21%12%46%5%24445%28%
2499
16th to endDay
20%9%25%424435%37%
2638
May1st to 15thDay
19%7%26%5%3445%7%33%
2780
16th to endDay
14%6%2442446%8%40%
3066
June1st to 15thDay
18%6%245%245%6%6%36%
2940
16th to endDay
15%4245%245%5%9%40%
2940
July1st to 15thDay
9%4244245%7%8%45%
2874
16th to endDay
11%5%25%5%36%5%8%9%36%
2751
August1st to 15thDay
11%6%245%35%6%6%10%38%
2487
16th to endDay
11%5%2443446%9%42%
2594
September1st to 15thDay
18%5%25%43445%7%38%
2340
16th to endDay
13%5%15%5%35%5%5%7%39%
2115
October1st to 15thDay
24%7%26%5%24446%31%
1950
16th to endDay
27%12%37%5%35%43422%
2080
November1st to 15thDay
17%12%46%5%35%447%28%
1771
16th to endDay
23%15%5%8%5%2445%5%20%
1680
December1st to 15thDay
20%20%6%9%7%3435%412%
1680
16th to endDay
21%22%8%11%7%343348%
1792
January1st to 15thNight
21%19%6%11%9%3433313%
2884
16th to endNight
17%19%7%11%7%35%445%13%
2912
February1st to 15thNight
19%17%8%13%6%3433414%
2668
16th to endNight
18%15%5%12%8%3434417%
2333
March1st to 15thNight
19%14%47%6%3434425%
2310
16th to endNight
16%11%37%434345%34%
2464
April1st to 15thNight
23%10%36%5%24345%28%
2108
16th to endNight
17%6%25%5%25%446%40%
1937
May1st to 15thNight
18%6%37%5%26%46%6%32%
1830
16th to endNight
12%5%24435%45%8%41%
1751
June1st to 15thNight
15%6%25%5%35%5%6%5%38%
1680
16th to endNight
14%5%245%35%5%5%7%41%
1680
July1st to 15thNight
7%5%2442445%8%49%
1648
16th to endNight
11%3245%345%7%7%44%
1767
August1st to 15thNight
10%4145%3446%9%44%
1726
16th to endNight
10%4145%245%6%7%46%
1947
September1st to 15thNight
16%6%2432335%8%43%
1950
16th to endNight
16%5%24433446%44%
2173
October1st to 15thNight
20%7%26%5%33437%35%
2340
16th to endNight
28%9%26%43445%5%24%
2496
November1st to 15thNight
20%9%36%424446%32%
2744
16th to endNight
20%15%5%8%5%35%436%21%
2940
December1st to 15thNight
21%22%7%9%6%3434413%
2940
16th to endNight
23%18%7%11%7%3433411%
3136

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
73%48%11%2
1712
16th to endDay
75%6%10%5%1
2016
February1st to 15thDay
76%5%8%8%
1847
16th to endDay
70%411%10%3
1708
March1st to 15thDay
66%411%12%4
2310
16th to endDay
53%49%21%8%1
2464
April1st to 15thDay
57%5%10%17%9%
2499
16th to endDay
49%49%19%14%3
2638
May1st to 15thDay
49%6%10%21%11%
2780
16th to endDay
41%6%14%24%11%1
3070
June1st to 15thDay
45%6%13%20%13%1
2940
16th to endDay
39%7%14%23%13%
2940
July1st to 15thDay
34%6%12%24%20%1
2725
16th to endDay
40%7%17%21%11%
2593
August1st to 15thDay
40%6%17%21%12%1
2474
16th to endDay
38%6%13%27%12%1
2594
September1st to 15thDay
43%5%13%23%11%1
2340
16th to endDay
41%5%13%25%12%
2115
October1st to 15thDay
53%5%11%18%10%
1950
16th to endDay
63%414%13%3
2080
November1st to 15thDay
55%6%13%15%7%1
1771
16th to endDay
64%5%13%11%4
1680
December1st to 15thDay
71%5%12%8%1
1680
16th to endDay
78%5%8%5%1
1792
January1st to 15thNight
74%5%8%8%3
2884
16th to endNight
72%5%10%8%3
2912
February1st to 15thNight
72%5%9%10%2
2677
16th to endNight
68%410%12%4
2333
March1st to 15thNight
61%410%16%6%
2310
16th to endNight
50%49%20%13%1
2464
April1st to 15thNight
57%5%9%17%10%
2108
16th to endNight
44%5%10%21%15%3
1937
May1st to 15thNight
48%6%10%21%11%2
1831
16th to endNight
38%7%13%23%15%2
1753
June1st to 15thNight
44%6%11%21%16%
1680
16th to endNight
40%6%12%21%16%2
1680
July1st to 15thNight
32%5%11%25%21%3
1568
16th to endNight
35%6%16%23%14%3
1662
August1st to 15thNight
35%6%18%25%13%
1715
16th to endNight
33%6%12%31%14%1
1947
September1st to 15thNight
38%5%14%24%15%1
1950
16th to endNight
38%5%12%26%17%
2173
October1st to 15thNight
49%410%19%14%
2340
16th to endNight
59%5%14%14%5%
2496
November1st to 15thNight
50%5%12%19%9%1
2744
16th to endNight
61%6%12%15%3
2940
December1st to 15thNight
71%5%10%9%2
2940
16th to endNight
75%5%9%7%2
3136

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
21%35%21%15%32
131
16th to endDay
25%34%23%15%2
192
February1st to 15thDay
28%38%27%6%
180
16th to endDay
31%27%29%9%
201
March1st to 15thDay
25%27%24%16%6%
390
16th to endDay
24%23%27%18%41
416
April1st to 15thDay
30%26%23%12%41
390
16th to endDay
25%24%22%12%10%3
379
May1st to 15thDay
28%21%24%13%8%3
408
16th to endDay
15%21%30%21%7%2
459
June1st to 15thDay
22%21%27%21%7%
435
16th to endDay
18%19%30%22%8%1
435
July1st to 15thDay
10%11%24%29%17%6%
406
16th to endDay
13%15%26%27%12%4
390
August1st to 15thDay
15%12%22%24%17%9%
358
16th to endDay
12%9%28%21%16%11%
396
September1st to 15thDay
14%9%21%26%18%10%
375
16th to endDay
16%12%20%19%18%12%
374
October1st to 15thDay
26%14%23%17%11%6%
375
16th to endDay
31%25%24%12%6%
400
November1st to 15thDay
27%19%29%15%6%1
211
16th to endDay
35%28%20%15%1
120
December1st to 15thDay
22%31%26%12%5%
120
16th to endDay
34%35%21%7%
128
January1st to 15thNight
25%34%23%13%3
840
16th to endNight
22%36%23%12%4
896
February1st to 15thNight
23%36%23%13%2
824
16th to endNight
23%31%22%18%2
735
March1st to 15thNight
23%29%23%18%5%
840
16th to endNight
20%23%27%20%6%1
896
April1st to 15thNight
22%27%25%21%3
838
16th to endNight
17%24%25%22%9%1
691
May1st to 15thNight
19%22%19%25%10%1
571
16th to endNight
12%21%25%29%10%
439
June1st to 15thNight
14%21%27%25%10%
420
16th to endNight
14%18%26%31%8%
420
July1st to 15thNight
9%13%20%38%17%1
392
16th to endNight
10%18%24%27%17%1
533
August1st to 15thNight
10%11%18%35%21%2
575
16th to endNight
10%10%21%29%25%2
705
September1st to 15thNight
15%12%18%28%20%3
780
16th to endNight
15%13%17%23%22%6%
777
October1st to 15thNight
22%16%23%22%13%2
780
16th to endNight
29%22%24%18%4
832
November1st to 15thNight
20%26%21%21%9%1
820
16th to endNight
24%32%22%13%6%
840
December1st to 15thNight
30%33%18%13%3
840
16th to endNight
26%34%22%13%2
896
Page generated at 2019-07-12 07:32:36. Version ac04

Copyright 2019 A. Danko


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