Buffalo
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Buffalo 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
42%
24905
20%
74482
12%
24861
49%
24861
30%
45238

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
32%
947
20%
2647
9%
946
41%
946
26%
1715
January11th to 20thNight
31%
908
17%
2541
7%
908
40%
908
25%
1640
January21st to endNight
27%
990
18%
2772
7%
990
36%
990
21%
1896
February1st to 10thNight
32%
783
15%
2403
8%
783
39%
783
23%
1596
February11th to 20thNight
30%
700
19%
2172
10%
700
38%
700
24%
1369
February21st to endNight
40%
592
19%
1776
10%
592
48%
592
27%
1145
March1st to 10thNight
36%
720
19%
2160
10%
720
43%
720
27%
1353
March11th to 20thNight
40%
715
20%
2115
13%
715
46%
715
29%
1333
March21st to endNight
38%
594
15%
1980
11%
594
45%
594
19%
1347
April1st to 10thNight
38%
540
17%
1800
12%
540
46%
540
23%
1140
April11th to 20thNight
30%
533
18%
1777
11%
533
42%
533
22%
1134
April21st to endNight
43%
540
18%
1644
16%
540
47%
540
26%
1048
May1st to 10thNight
51%
540
17%
1499
13%
540
54%
540
32%
945
May11th to 20thNight
49%
531
17%
1418
10%
531
52%
531
31%
933
May21st to endNight
43%
582
13%
1552
7%
582
44%
582
27%
1064
June1st to 10thNight
50%
540
14%
1440
7%
540
54%
540
34%
908
June11th to 20thNight
39%
540
12%
1440
5%
540
42%
540
32%
930
June21st to endNight
55%
540
16%
1440
7%
540
59%
540
48%
797
July1st to 10thNight
61%
525
15%
1400
9%
525
63%
525
48%
777
July11th to 20thNight
57%
522
19%
1392
10%
522
61%
522
48%
767
July21st to endNight
65%
591
25%
1488
17%
558
67%
558
51%
794
August1st to 10thNight
61%
537
27%
1424
19%
534
66%
534
49%
784
August11th to 20thNight
65%
534
27%
1598
23%
534
70%
534
48%
816
August21st to endNight
63%
594
30%
1980
30%
594
71%
594
46%
951
September1st to 10thNight
61%
540
27%
1800
27%
540
69%
540
44%
876
September11th to 20thNight
58%
540
29%
1864
27%
540
67%
540
37%
956
September21st to endNight
51%
540
28%
1980
26%
540
59%
540
34%
1035
October1st to 10thNight
45%
651
24%
2091
18%
651
51%
651
29%
1259
October11th to 20thNight
43%
750
27%
2190
14%
750
52%
750
34%
1276
October21st to endNight
37%
990
24%
2574
9%
990
45%
990
35%
1597
November1st to 10thNight
40%
925
24%
2405
12%
925
46%
925
33%
1529
November11th to 20thNight
36%
950
26%
2536
11%
950
46%
950
31%
1614
November21st to endNight
36%
950
24%
2660
10%
950
48%
950
33%
1601
December1st to 10thNight
31%
950
19%
2660
8%
950
42%
950
27%
1738
December11th to 20thNight
32%
948
22%
3153
10%
948
42%
948
25%
1858
December21st to endNight
28%
1033
13%
4711
6%
1026
39%
1026
15%
2717

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
8%6%35%5%345%5%8%48%
74788
Night
7%7%36%5%345%5%7%47%
74944
TransparencyDay
34%6%14%27%15%3
74491
Night
35%6%14%27%15%3
74763
SeeingDay
12%8%29%30%17%4
14809
Night
11%8%32%36%11%1
24928

By Month

Percentage Cloud Cover SW (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
5%7%46%6%46%6%7%8%42%
1518
11th to 20thDay
210%6%7%7%35%5%47%43%
1448
21st to endDay
39%5%8%7%35%5%5%7%42%
1584
February1st to 10thDay
9%8%5%9%7%46%7%5%6%35%
1570
11th to 20thDay
5%9%5%8%7%5%5%6%5%7%39%
1676
21st to endDay
49%49%7%446%6%7%40%
1480
March1st to 10thDay
5%9%49%7%35%45%8%41%
1800
11th to 20thDay
7%7%26%4245%5%8%48%
1841
21st to endDay
12%10%48%6%35%47%7%34%
2376
April1st to 10thDay
14%7%37%5%35%46%8%38%
2160
11th to 20thDay
14%9%48%6%345%6%8%33%
2131
21st to endDay
15%8%35%435%5%6%6%39%
2314
May1st to 10thDay
15%7%35%435%5%6%8%38%
2457
11th to 20thDay
15%6%245%35%6%6%8%41%
2478
21st to endDay
17%7%35%5%25%5%5%8%37%
2724
June1st to 10thDay
12%425%425%6%6%9%45%
2520
11th to 20thDay
8%5%245%45%6%7%8%47%
2520
21st to endDay
5%314435%5%5%7%59%
2520
July1st to 10thDay
6%3134246%6%10%55%
2520
11th to 20thDay
321222345%7%68%
2520
21st to endDay
43133245%6%7%61%
2742
August1st to 10thDay
8%324435%5%6%8%54%
2507
11th to 20thDay
6%3244345%6%8%58%
2300
21st to endDay
5%41332345%7%63%
2376
September1st to 10thDay
6%424423446%62%
2160
11th to 20thDay
8%31432446%8%58%
2094
21st to endDay
13%424422347%56%
1980
October1st to 10thDay
14%6%24323347%50%
1867
11th to 20thDay
11%6%3433445%6%50%
1751
21st to endDay
9%7%36%5%2445%6%49%
1782
November1st to 10thDay
7%7%35%435%5%6%7%48%
1673
11th to 20thDay
5%7%25%5%25%5%5%8%49%
1639
21st to endDay
5%7%45%5%346%6%8%46%
1520
December1st to 10thDay
5%8%49%7%45%46%7%41%
1520
11th to 20thDay
36%37%5%345%6%9%47%
1926
21st to endDay
6%9%47%6%35%446%47%
2794
January1st to 10thNight
48%47%7%45%6%7%7%41%
2647
11th to 20thNight
49%5%7%6%35%5%7%8%42%
2541
21st to endNight
49%6%8%8%45%5%5%8%37%
2772
February1st to 10thNight
6%9%5%9%5%47%5%6%7%37%
2403
11th to 20thNight
410%48%6%45%5%5%8%42%
2171
21st to endNight
5%9%47%6%36%5%6%7%43%
1776
March1st to 10thNight
6%9%37%7%3345%7%45%
2160
11th to 20thNight
8%8%35%5%35%6%6%9%42%
2115
21st to endNight
11%9%47%7%35%6%6%7%34%
1980
April1st to 10thNight
13%9%36%5%246%5%6%41%
1800
11th to 20thNight
11%8%5%6%6%345%6%7%39%
1777
21st to endNight
14%6%35%5%345%5%8%42%
1644
May1st to 10thNight
11%7%25%5%346%5%8%46%
1499
11th to 20thNight
14%6%245%35%5%6%8%43%
1417
21st to endNight
15%5%345%35%5%7%9%39%
1552
June1st to 10thNight
10%4244345%5%9%49%
1440
11th to 20thNight
11%5%25%5%35%5%6%8%46%
1440
21st to endNight
6%31432445%9%60%
1440
July1st to 10thNight
6%313335%5%7%10%54%
1440
11th to 20thNight
6%3143335%5%8%60%
1440
21st to endNight
322343346%8%62%
1576
August1st to 10thNight
5%3143335%5%7%61%
1432
11th to 20thNight
6%3133245%6%8%60%
1598
21st to endNight
5%21332445%8%63%
1980
September1st to 10thNight
7%413324347%62%
1800
11th to 20thNight
8%42342345%7%58%
1864
21st to endNight
11%424433346%56%
1980
October1st to 10thNight
13%7%3442445%6%48%
2091
11th to 20thNight
10%5%34434447%53%
2190
21st to endNight
9%8%145%3445%8%49%
2574
November1st to 10thNight
7%7%45%5%345%5%7%48%
2405
11th to 20thNight
5%8%47%5%345%6%6%47%
2536
21st to endNight
5%7%35%435%6%6%8%49%
2660
December1st to 10thNight
5%8%48%7%45%5%5%7%42%
2660
11th to 20thNight
46%37%7%445%6%7%48%
3271
21st to endNight
8%10%37%6%34446%44%
4873

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
38%7%19%25%11%1
1519
11th to 20thDay
40%7%19%24%8%3
1448
21st to endDay
40%8%17%22%11%2
1584
February1st to 10thDay
48%6%12%21%12%1
1570
11th to 20thDay
43%6%16%22%10%2
1685
21st to endDay
41%6%16%24%11%2
1480
March1st to 10thDay
42%5%18%24%10%
1800
11th to 20thDay
33%6%14%31%14%2
1841
21st to endDay
47%7%15%22%8%1
2376
April1st to 10thDay
43%6%16%22%12%2
2160
11th to 20thDay
48%6%14%22%9%
2134
21st to endDay
44%6%14%26%9%1
2314
May1st to 10thDay
43%6%13%28%10%
2457
11th to 20thDay
39%7%15%28%11%
2482
21st to endDay
43%8%19%23%7%
2724
June1st to 10thDay
34%8%19%28%10%
2520
11th to 20thDay
32%8%16%29%14%2
2520
21st to endDay
23%6%15%32%20%4
2520
July1st to 10thDay
23%6%13%33%20%5%
2451
11th to 20thDay
15%5%12%29%28%11%
2445
21st to endDay
21%5%13%26%27%8%
2590
August1st to 10thDay
28%6%11%29%20%7%
2491
11th to 20thDay
24%6%11%33%20%6%
2300
21st to endDay
22%410%26%30%8%
2376
September1st to 10thDay
23%49%31%25%8%
2160
11th to 20thDay
24%6%12%30%23%5%
2094
21st to endDay
29%410%34%22%2
1980
October1st to 10thDay
35%5%12%27%18%3
1867
11th to 20thDay
34%411%30%17%4
1751
21st to endDay
36%5%15%26%15%4
1782
November1st to 10thDay
34%5%13%27%17%3
1673
11th to 20thDay
33%5%15%28%17%2
1639
21st to endDay
34%7%16%29%12%2
1520
December1st to 10thDay
41%5%15%27%11%1
1520
11th to 20thDay
32%6%19%35%7%1
1924
21st to endDay
39%39%31%16%2
2794
January1st to 10thNight
39%6%15%26%12%1
2647
11th to 20thNight
39%6%19%24%9%3
2541
21st to endNight
44%6%15%21%11%1
2772
February1st to 10thNight
44%6%16%20%13%1
2403
11th to 20thNight
40%5%16%25%12%1
2172
21st to endNight
40%6%13%22%15%3
1776
March1st to 10thNight
38%6%15%28%12%1
2160
11th to 20thNight
38%6%14%26%16%1
2115
21st to endNight
47%7%15%21%9%1
1980
April1st to 10thNight
43%5%13%24%12%2
1800
11th to 20thNight
43%5%13%25%13%1
1777
21st to endNight
40%6%14%29%11%1
1644
May1st to 10thNight
36%5%15%31%12%
1499
11th to 20thNight
38%7%15%31%9%
1418
21st to endNight
39%10%19%24%8%1
1552
June1st to 10thNight
32%8%18%29%12%1
1440
11th to 20thNight
35%8%18%24%14%2
1440
21st to endNight
22%6%18%31%20%3
1440
July1st to 10thNight
23%6%16%34%18%4
1400
11th to 20thNight
23%5%14%26%22%11%
1392
21st to endNight
20%6%13%26%27%9%
1488
August1st to 10thNight
22%6%12%31%21%8%
1424
11th to 20thNight
21%5%14%26%26%8%
1598
21st to endNight
20%6%10%30%28%7%
1980
September1st to 10thNight
23%310%30%24%10%
1800
11th to 20thNight
27%412%29%22%6%
1864
21st to endNight
30%410%30%24%2
1980
October1st to 10thNight
36%5%13%26%16%4
2091
11th to 20thNight
32%49%33%18%4
2190
21st to endNight
34%5%15%26%17%3
2574
November1st to 10thNight
35%6%14%25%16%4
2405
11th to 20thNight
36%6%12%27%16%3
2536
21st to endNight
32%6%18%26%16%2
2660
December1st to 10thNight
41%5%15%25%13%2
2660
11th to 20thNight
34%7%17%32%10%
3272
21st to endNight
41%410%29%15%2
4873

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
7%10%35%29%12%7%
270
11th to 20thDay
11%12%36%24%15%2
243
21st to endDay
12%19%38%24%6%1
264
February1st to 10thDay
10%12%41%33%5%
240
11th to 20thDay
15%11%42%26%41
240
21st to endDay
12%10%35%34%7%3
198
March1st to 10thDay
13%11%40%23%10%3
240
11th to 20thDay
13%10%31%30%11%5%
277
21st to endDay
18%13%28%24%13%5%
462
April1st to 10thDay
19%15%30%29%8%
420
11th to 20thDay
21%16%38%18%6%1
412
21st to endDay
19%10%25%28%15%3
574
May1st to 10thDay
18%7%26%27%16%5%
603
11th to 20thDay
20%6%22%31%16%5%
625
21st to endDay
18%6%28%28%15%5%
679
June1st to 10thDay
10%7%21%30%25%6%
630
11th to 20thDay
10%8%34%31%15%2
630
21st to endDay
8%6%25%35%22%4
630
July1st to 10thDay
6%320%38%28%5%
621
11th to 20thDay
36%28%38%23%3
618
21st to endDay
7%323%40%23%5%
684
August1st to 10thDay
9%321%39%23%5%
626
11th to 20thDay
7%320%36%26%6%
540
21st to endDay
5%6%23%34%21%10%
495
September1st to 10thDay
6%7%30%34%18%6%
450
11th to 20thDay
9%326%32%24%7%
384
21st to endDay
17%9%24%26%19%6%
270
October1st to 10thDay
20%7%22%25%21%5%
270
11th to 20thDay
15%13%33%21%14%3
270
21st to endDay
16%15%34%18%13%3
297
November1st to 10thDay
13%11%36%24%10%6%
270
11th to 20thDay
10%13%40%25%9%3
270
21st to endDay
13%10%37%26%13%1
270
December1st to 10thDay
12%13%36%24%12%2
270
11th to 20thDay
10%13%40%30%7%1
270
21st to endDay
11%10%42%26%9%2
297
January1st to 10thNight
7%12%39%29%11%1
950
11th to 20thNight
10%13%38%29%9%1
908
21st to endNight
10%15%37%31%7%
990
February1st to 10thNight
8%10%39%32%10%
783
11th to 20thNight
9%13%39%32%7%1
704
21st to endNight
8%6%36%38%11%1
592
March1st to 10thNight
11%9%36%35%9%1
720
11th to 20thNight
10%7%35%36%10%2
715
21st to endNight
15%9%27%39%9%1
594
April1st to 10thNight
17%9%29%37%8%
540
11th to 20thNight
14%9%39%32%6%
533
21st to endNight
17%7%25%36%14%
540
May1st to 10thNight
13%6%24%40%15%2
540
11th to 20thNight
17%5%23%38%16%1
531
21st to endNight
18%430%34%13%1
584
June1st to 10thNight
12%8%25%38%17%1
540
11th to 20thNight
13%8%36%35%9%
540
21st to endNight
7%331%45%13%1
540
July1st to 10thNight
7%226%49%17%1
525
11th to 20thNight
6%329%49%12%
522
21st to endNight
5%323%54%16%
591
August1st to 10thNight
6%325%49%16%1
537
11th to 20thNight
7%321%47%21%1
534
21st to endNight
7%324%48%17%1
594
September1st to 10thNight
8%424%45%19%1
540
11th to 20thNight
10%5%24%47%14%1
540
21st to endNight
11%6%29%40%13%1
540
October1st to 10thNight
15%7%27%36%14%
651
11th to 20thNight
13%8%30%33%15%1
750
21st to endNight
14%11%34%31%9%1
990
November1st to 10thNight
10%10%34%33%11%1
925
11th to 20thNight
9%11%37%33%9%1
950
21st to endNight
9%13%37%32%10%
950
December1st to 10thNight
9%11%40%29%10%
950
11th to 20thNight
9%11%37%34%8%1
950
21st to endNight
13%12%36%30%8%1
1045
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