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 2018-10-08.

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
43%
17585
20%
51010
12%
17547
50%
17547
31%
31256

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
31%
972
16%
2716
9%
970
38%
970
24%
1810
January16th to endNight
29%
1040
18%
2912
8%
1040
38%
1040
25%
1893
February1st to 15thNight
31%
804
14%
2520
7%
804
38%
804
22%
1660
February16th to endNight
39%
684
17%
2050
11%
684
45%
684
27%
1305
March1st to 15thNight
41%
780
18%
2340
11%
780
47%
780
29%
1443
March16th to endNight
38%
684
15%
2176
10%
684
44%
684
22%
1459
April1st to 15thNight
38%
584
17%
1948
12%
584
47%
584
25%
1207
April16th to endNight
39%
579
17%
1815
14%
579
45%
579
24%
1166
May1st to 15thNight
51%
585
17%
1602
11%
585
53%
585
32%
1012
May16th to endNight
47%
609
14%
1626
8%
609
49%
609
27%
1105
June1st to 15thNight
42%
585
11%
1560
5%
585
45%
585
31%
1024
June16th to endNight
52%
585
13%
1560
5%
585
55%
585
44%
899
July1st to 15thNight
62%
555
16%
1480
9%
555
65%
555
52%
795
July16th to endNight
65%
612
21%
1544
14%
579
66%
579
52%
812
August1st to 15thNight
64%
575
25%
1538
19%
572
68%
572
52%
827
August16th to endNight
67%
621
29%
2058
28%
621
75%
621
48%
976
September1st to 15thNight
60%
585
27%
1950
24%
585
69%
585
42%
972
September16th to endNight
53%
582
28%
2128
26%
582
62%
582
35%
1105
October1st to 15thNight
41%
703
25%
2207
18%
703
48%
703
29%
1337
October16th to endNight
45%
921
26%
2457
12%
921
53%
921
36%
1493
November1st to 15thNight
41%
950
25%
2470
12%
950
48%
950
35%
1529
November16th to endNight
37%
975
24%
2711
11%
975
47%
975
32%
1672
December1st to 15thNight
32%
975
16%
2730
8%
975
39%
975
24%
1816
December16th to endNight
31%
1040
19%
2912
7%
1040
41%
1040
24%
1939

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
9%5%25%42445%7%47%
52135
Night
7%6%25%5%2445%7%47%
51176
Cloud CoverDay
8%5%25%42445%7%47%
52145
Night
7%6%35%42445%7%47%
51179
Cloud CoverDay
8%5%25%42445%7%47%
52145
Night
7%6%25%5%2445%7%47%
51181
Cloud CoverDay
8%6%25%42445%7%47%
52143
Night
7%6%25%42445%7%47%
51181
TransparencyDay
35%5%15%26%14%2
51818
Night
35%5%15%26%14%2
51010
SeeingDay
11%7%28%30%17%4
7542
Night
10%8%31%36%12%
17595

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
5%9%37%7%46%5%5%7%38%
1552
16th to endDay
38%47%6%24448%44%
1664
February1st to 15thDay
9%10%5%7%5%36%446%35%
1682
16th to endDay
37%47%6%445%5%9%39%
1710
March1st to 15thDay
47%36%435%45%8%44%
1940
16th to endDay
13%9%47%5%2446%7%34%
2397
April1st to 15thDay
14%7%36%43445%8%37%
2330
16th to endDay
16%7%35%42446%6%38%
2418
May1st to 15thDay
15%6%25%4245%5%7%39%
2677
16th to endDay
15%5%24425%5%5%9%39%
2840
June1st to 15thDay
12%5%244245%6%9%43%
2730
16th to endDay
6%3133345%5%7%56%
2730
July1st to 15thDay
42123145%6%8%59%
2730
16th to endDay
421222446%7%62%
2880
August1st to 15thDay
7%2134245%5%8%53%
2667
16th to endDay
6%213323446%61%
2493
September1st to 15thDay
6%31331335%7%59%
2340
16th to endDay
12%413312236%57%
2161
October1st to 15thDay
13%6%14324447%47%
1921
16th to endDay
8%6%35%42335%8%49%
1755
November1st to 15thDay
6%5%244345%5%6%51%
1718
16th to endDay
7%7%35%4345%5%8%44%
1576
December1st to 15thDay
47%410%6%45%46%7%38%
1560
16th to endDay
7%9%48%7%35%45%6%37%
1664
January1st to 15thNight
39%46%7%35%6%5%8%38%
2716
16th to endNight
5%9%46%6%3445%7%43%
2912
February1st to 15thNight
6%9%48%5%36%5%6%7%37%
2516
16th to endNight
49%36%5%45%45%7%44%
2050
March1st to 15thNight
6%7%26%5%2445%8%44%
2327
16th to endNight
11%9%35%5%245%6%8%35%
2176
April1st to 15thNight
12%7%36%4245%46%42%
1948
16th to endNight
15%6%24434448%41%
1815
May1st to 15thNight
10%6%25%42445%7%46%
1602
16th to endNight
15%423435%5%5%9%40%
1625
June1st to 15thNight
11%4145%245%6%8%44%
1560
16th to endNight
6%31332345%8%56%
1560
July1st to 15thNight
411331446%9%58%
1560
16th to endNight
31342336%7%62%
1640
August1st to 15thNight
421231335%9%61%
1546
16th to endNight
5%212214347%64%
2058
September1st to 15thNight
6%31332435%6%60%
1950
16th to endNight
11%312323346%56%
2128
October1st to 15thNight
13%6%2442245%6%47%
2207
16th to endNight
8%6%145%24448%50%
2457
November1st to 15thNight
6%6%3442345%7%50%
2470
16th to endNight
5%7%35%4245%5%7%47%
2711
December1st to 15thNight
47%48%7%45%45%7%38%
2730
16th to endNight
7%9%37%6%345%5%6%39%
2912

Percentage Cloud Cover NW (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
49%47%6%45%47%7%38%
1553
16th to endDay
28%47%6%2445%7%45%
1664
February1st to 15thDay
9%10%47%6%35%45%5%35%
1682
16th to endDay
38%47%6%445%6%7%40%
1710
March1st to 15thDay
47%36%425%45%9%44%
1950
16th to endDay
12%9%46%6%2446%7%34%
2396
April1st to 15thDay
13%7%36%43445%8%37%
2330
16th to endDay
16%8%35%42446%6%37%
2418
May1st to 15thDay
15%6%25%4345%5%7%39%
2677
16th to endDay
14%5%245%245%5%9%39%
2840
June1st to 15thDay
11%4344345%6%8%42%
2730
16th to endDay
5%31332445%7%56%
2730
July1st to 15thDay
411231446%9%58%
2730
16th to endDay
421221445%7%62%
2880
August1st to 15thDay
6%3133245%6%8%53%
2667
16th to endDay
4313423446%61%
2493
September1st to 15thDay
6%31332235%7%59%
2340
16th to endDay
12%322322246%57%
2161
October1st to 15thDay
13%5%23424447%48%
1921
16th to endDay
8%6%35%32435%7%50%
1755
November1st to 15thDay
5%5%244245%5%6%51%
1718
16th to endDay
7%7%35%43446%8%44%
1576
December1st to 15thDay
5%6%49%7%45%46%8%37%
1560
16th to endDay
7%9%48%6%35%5%5%6%37%
1664
January1st to 15thNight
39%46%6%36%6%5%7%39%
2716
16th to endNight
48%5%6%6%3445%7%43%
2912
February1st to 15thNight
6%8%48%5%36%46%7%37%
2509
16th to endNight
48%46%5%36%45%7%43%
2050
March1st to 15thNight
6%6%36%6%2445%8%44%
2340
16th to endNight
11%9%26%5%35%5%6%8%35%
2173
April1st to 15thNight
12%7%35%4135%5%6%42%
1948
16th to endNight
14%7%244335%48%40%
1815
May1st to 15thNight
10%6%25%43435%7%45%
1601
16th to endNight
15%5%2343447%8%40%
1626
June1st to 15thNight
10%424425%5%5%9%43%
1560
16th to endNight
6%31332445%7%56%
1560
July1st to 15thNight
42133235%5%9%58%
1560
16th to endNight
311342245%8%61%
1640
August1st to 15thNight
421232245%9%61%
1546
16th to endNight
5%21232335%7%64%
2058
September1st to 15thNight
6%31332435%6%60%
1950
16th to endNight
10%413423337%56%
2128
October1st to 15thNight
13%6%24323346%47%
2207
16th to endNight
8%6%245%24448%49%
2457
November1st to 15thNight
6%7%35%42345%7%50%
2470
16th to endNight
5%7%25%42445%7%47%
2711
December1st to 15thNight
47%49%7%45%45%7%39%
2730
16th to endNight
6%9%37%6%345%5%7%39%
2912

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 15thDay
48%5%6%6%45%5%6%6%38%
1552
16th to endDay
38%5%7%6%24447%45%
1664
February1st to 15thDay
9%10%5%7%5%36%45%6%36%
1682
16th to endDay
38%47%6%446%6%8%40%
1710
March1st to 15thDay
47%36%5%25%45%9%44%
1950
16th to endDay
12%9%47%5%2446%7%35%
2397
April1st to 15thDay
13%7%36%5%3445%8%37%
2330
16th to endDay
16%7%35%32446%6%37%
2418
May1st to 15thDay
15%6%35%4345%5%7%39%
2677
16th to endDay
14%5%245%25%5%5%8%39%
2840
June1st to 15thDay
11%5%25%4245%6%8%43%
2730
16th to endDay
6%21333445%7%56%
2730
July1st to 15thDay
41133245%5%8%58%
2730
16th to endDay
421222445%7%62%
2880
August1st to 15thDay
6%3134245%5%8%53%
2667
16th to endDay
5%313323346%61%
2493
September1st to 15thDay
6%313313447%59%
2340
16th to endDay
12%313312236%57%
2161
October1st to 15thDay
13%5%24324346%48%
1921
16th to endDay
8%6%25%32335%7%50%
1755
November1st to 15thDay
6%5%24425%45%6%51%
1718
16th to endDay
7%6%35%5%245%5%8%44%
1576
December1st to 15thDay
47%410%6%45%46%7%38%
1560
16th to endDay
7%9%5%7%7%35%45%6%37%
1664
January1st to 15thNight
49%45%7%35%5%6%7%39%
2716
16th to endNight
48%5%6%6%3445%7%43%
2912
February1st to 15thNight
6%8%48%5%36%46%7%37%
2509
16th to endNight
39%36%5%36%447%43%
2050
March1st to 15thNight
6%6%26%6%2446%8%45%
2340
16th to endNight
11%9%35%5%345%6%8%35%
2176
April1st to 15thNight
12%7%35%4235%46%42%
1948
16th to endNight
15%6%2443445%7%40%
1815
May1st to 15thNight
10%7%15%42445%7%45%
1601
16th to endNight
14%5%234245%6%8%41%
1625
June1st to 15thNight
11%4145%25%5%5%8%44%
1560
16th to endNight
6%31432445%7%56%
1560
July1st to 15thNight
421332446%9%58%
1560
16th to endNight
311332245%8%62%
1640
August1st to 15thNight
43332345%8%61%
1546
16th to endNight
5%112223447%64%
2058
September1st to 15thNight
5%31332335%6%60%
1950
16th to endNight
10%322323346%56%
2128
October1st to 15thNight
13%6%24323346%47%
2207
16th to endNight
8%6%235%24448%50%
2457
November1st to 15thNight
6%6%35%42345%7%50%
2470
16th to endNight
5%7%25%4245%5%7%47%
2711
December1st to 15thNight
47%48%7%4445%7%39%
2730
16th to endNight
7%9%37%6%345%47%39%
2912

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
48%48%7%36%5%5%7%39%
1552
16th to endDay
38%5%6%6%24448%45%
1664
February1st to 15thDay
9%10%47%6%35%5%46%36%
1682
16th to endDay
38%47%6%45%5%6%8%40%
1710
March1st to 15thDay
47%37%425%45%9%44%
1950
16th to endDay
12%10%36%5%2445%8%34%
2395
April1st to 15thDay
14%7%36%5%2446%7%37%
2330
16th to endDay
16%7%25%3245%6%6%37%
2418
May1st to 15thDay
14%7%245%345%47%40%
2677
16th to endDay
15%5%244345%5%8%40%
2840
June1st to 15thDay
11%5%2432446%9%43%
2730
16th to endDay
6%31342445%7%57%
2730
July1st to 15thDay
42133245%5%8%58%
2730
16th to endDay
421222346%7%62%
2880
August1st to 15thDay
7%313425%5%6%8%53%
2667
16th to endDay
5%313323446%61%
2493
September1st to 15thDay
6%313223347%58%
2340
16th to endDay
12%422312236%57%
2161
October1st to 15thDay
13%424423446%48%
1921
16th to endDay
8%6%3432335%7%49%
1755
November1st to 15thDay
6%5%24426%45%6%51%
1718
16th to endDay
7%8%25%5%345%5%8%43%
1576
December1st to 15thDay
47%411%7%35%46%8%37%
1560
16th to endDay
7%10%47%7%3445%6%37%
1664
January1st to 15thNight
48%46%7%35%5%6%7%39%
2716
16th to endNight
5%8%46%6%3445%7%42%
2912
February1st to 15thNight
7%8%47%5%345%6%7%37%
2509
16th to endNight
48%46%5%35%45%7%44%
2050
March1st to 15thNight
6%6%26%5%345%5%8%44%
2340
16th to endNight
11%9%36%5%345%6%7%35%
2176
April1st to 15thNight
11%7%35%42345%7%42%
1948
16th to endNight
15%6%145%34447%41%
1815
May1st to 15thNight
10%6%15%42445%8%45%
1601
16th to endNight
15%5%244245%6%9%40%
1625
June1st to 15thNight
11%4143345%5%8%45%
1560
16th to endNight
7%31333336%7%57%
1560
July1st to 15thNight
421332346%10%58%
1560
16th to endNight
221331445%7%62%
1640
August1st to 15thNight
421332335%9%61%
1546
16th to endNight
4111323348%63%
2058
September1st to 15thNight
5%313323345%61%
1950
16th to endNight
10%313313346%56%
2128
October1st to 15thNight
13%5%2432335%5%48%
2207
16th to endNight
7%6%23433449%49%
2457
November1st to 15thNight
7%6%2442345%7%50%
2470
16th to endNight
6%7%35%4235%5%8%46%
2711
December1st to 15thNight
47%5%8%6%45%5%6%7%39%
2730
16th to endNight
7%8%37%6%3445%7%39%
2912

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
42%7%18%21%8%1
1553
16th to endDay
37%7%20%23%10%1
1664
February1st to 15thDay
48%415%20%9%
1682
16th to endDay
39%6%18%23%9%2
1710
March1st to 15thDay
36%5%18%28%10%
1950
16th to endDay
47%5%14%25%6%
2397
April1st to 15thDay
44%6%17%22%8%
2330
16th to endDay
44%5%15%24%9%
2418
May1st to 15thDay
43%5%14%27%8%
2677
16th to endDay
40%8%18%24%7%
2844
June1st to 15thDay
36%7%18%25%10%
2730
16th to endDay
25%6%15%33%16%3
2730
July1st to 15thDay
21%5%12%29%23%7%
2581
16th to endDay
19%5%13%27%26%7%
2713
August1st to 15thDay
26%6%12%26%19%7%
2651
16th to endDay
23%49%29%25%8%
2493
September1st to 15thDay
24%410%31%22%6%
2340
16th to endDay
29%310%32%21%3
2161
October1st to 15thDay
37%5%12%25%17%3
1921
16th to endDay
33%415%27%14%4
1755
November1st to 15thDay
31%5%15%27%17%3
1718
16th to endDay
36%5%17%28%11%1
1576
December1st to 15thDay
43%5%19%23%8%
1560
16th to endDay
46%316%23%8%1
1664
January1st to 15thNight
41%5%17%23%8%2
2716
16th to endNight
39%5%18%22%11%1
2912
February1st to 15thNight
43%5%18%21%9%
2520
16th to endNight
39%5%16%23%13%1
2050
March1st to 15thNight
36%6%15%29%11%
2340
16th to endNight
44%6%16%23%7%
2176
April1st to 15thNight
41%415%26%9%1
1948
16th to endNight
41%5%14%27%10%
1815
May1st to 15thNight
36%416%31%9%
1602
16th to endNight
39%9%17%25%7%
1626
June1st to 15thNight
36%8%18%25%11%
1560
16th to endNight
25%6%18%29%17%3
1560
July1st to 15thNight
21%414%33%20%6%
1480
16th to endNight
20%414%28%24%7%
1544
August1st to 15thNight
20%5%15%30%19%8%
1538
16th to endNight
19%410%30%26%7%
2058
September1st to 15thNight
24%311%31%21%7%
1950
16th to endNight
29%310%30%21%4
2128
October1st to 15thNight
37%411%28%14%3
2207
16th to endNight
32%414%27%17%3
2457
November1st to 15thNight
32%5%15%25%18%3
2470
16th to endNight
34%5%18%26%12%2
2711
December1st to 15thNight
42%5%17%24%9%
2730
16th to endNight
42%5%15%24%10%
2912

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
8%5%34%27%14%8%
135
16th to endDay
11%15%31%26%13%1
144
February1st to 15thDay
16%8%43%28%2
135
16th to endDay
11%11%38%28%7%2
120
March1st to 15thDay
16%437%25%9%7%
135
16th to endDay
17%13%28%26%11%2
314
April1st to 15thDay
17%14%31%27%8%
329
16th to endDay
23%10%23%24%14%3
430
May1st to 15thDay
18%7%24%27%15%5%
543
16th to endDay
15%6%28%30%15%3
597
June1st to 15thDay
9%9%27%30%20%2
570
16th to endDay
9%6%29%33%18%3
570
July1st to 15thDay
4423%38%26%3
550
16th to endDay
5%326%36%24%4
595
August1st to 15thDay
6%220%42%24%3
549
16th to endDay
6%5%21%31%25%9%
405
September1st to 15thDay
6%6%29%31%19%6%
375
16th to endDay
17%5%27%31%14%4
196
October1st to 15thDay
17%8%33%22%13%3
157
16th to endDay
11%13%31%20%17%5%
144
November1st to 15thDay
7%237%23%17%11%
135
16th to endDay
20%8%37%25%8%
135
December1st to 15thDay
9%18%37%25%6%2
135
16th to endDay
12%10%44%22%9%
144
January1st to 15thNight
8%12%39%27%10%1
975
16th to endNight
9%14%38%29%7%
1040
February1st to 15thNight
8%10%38%31%10%
809
16th to endNight
7%8%34%36%11%1
684
March1st to 15thNight
9%6%34%36%11%1
780
16th to endNight
14%8%30%38%8%
684
April1st to 15thNight
14%7%32%38%7%
584
16th to endNight
17%7%28%32%14%
579
May1st to 15thNight
13%6%23%42%12%1
585
16th to endNight
17%427%34%16%
611
June1st to 15thNight
13%8%31%33%12%
585
16th to endNight
7%431%43%11%
585
July1st to 15thNight
4225%48%17%
555
16th to endNight
4222%54%16%
612
August1st to 15thNight
5%323%48%17%1
575
16th to endNight
5%221%47%20%1
621
September1st to 15thNight
6%424%44%19%
585
16th to endNight
11%427%38%16%1
582
October1st to 15thNight
15%7%29%34%12%
703
16th to endNight
11%9%28%35%12%1
921
November1st to 15thNight
10%10%33%32%13%1
950
16th to endNight
9%10%37%30%10%
975
December1st to 15thNight
7%12%38%30%10%
975
16th to endNight
12%11%35%30%9%
1040
Page generated at 2018-10-09 08:39:15. Version ac04

Copyright 2018 A. Danko


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