Little Buffalo State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Little Buffalo State Park clear sky chart from 2005-11-06 to 2025-10-04.

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 Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(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

By Month

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 Forecast	Data Points
Cloud Cover	Day	16% 7% 2 7% 5% 5% 5% 4 6% 7% 37%	126626
	Night	16% 7% 3 6% 4 4 4 4 5% 7% 38%	122768
Transparency	Day	43% 7% 12% 22% 14% 2	130220
	Night	43% 6% 12% 22% 15% 2	127244
Seeing	Day	23% 15% 27% 20% 11% 3	16018
	Night	21% 13% 27% 27% 11% 1	25389

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	13% 9% 4 12% 4 5% 4 3 5% 5% 37%	3597
	11th to 20th	Day	12% 11% 4 11% 7% 5% 5% 4 5% 6% 28%	3986
	21st to end	Day	16% 12% 3 7% 6% 5% 5% 3 4 6% 33%	4466
February	1st to 10th	Day	16% 13% 3 8% 5% 5% 4 3 5% 6% 33%	1800
	11th to 20th	Day	15% 9% 3 8% 4 5% 5% 3 6% 6% 35%	1780
	21st to end	Day	18% 10% 3 10% 4 4 5% 3 5% 6% 34%	1650
March	1st to 10th	Day	20% 8% 2 5% 4 4 4 3 5% 5% 39%	4797
	11th to 20th	Day	11% 7% 2 7% 5% 5% 5% 4 5% 7% 41%	4980
	21st to end	Day	15% 8% 2 6% 4 4 5% 4 5% 6% 41%	5589
April	1st to 10th	Day	18% 8% 3 8% 5% 4 4 4 5% 6% 36%	2400
	11th to 20th	Day	17% 7% 2 5% 4 4 5% 3 6% 7% 39%	2374
	21st to end	Day	17% 5% 2 6% 5% 4 4 4 6% 7% 39%	2410
May	1st to 10th	Day	27% 6% 2 5% 4 4 5% 4 6% 8% 29%	5862
	11th to 20th	Day	25% 7% 2 6% 4 4 5% 4 5% 8% 30%	6318
	21st to end	Day	18% 5% 2 6% 4 4 5% 4 7% 9% 34%	6934
June	1st to 10th	Day	13% 6% 3 6% 5% 4 5% 4 6% 7% 40%	2800
	11th to 20th	Day	15% 5% 2 6% 5% 5% 5% 4 6% 10% 37%	2800
	21st to end	Day	11% 5% 2 5% 5% 4 5% 5% 7% 10% 42%	2800
July	1st to 10th	Day	6% 5% 2 7% 6% 6% 6% 5% 7% 10% 40%	6360
	11th to 20th	Day	8% 6% 2 8% 6% 6% 7% 5% 9% 11% 32%	6360
	21st to end	Day	11% 7% 2 7% 5% 5% 5% 4 6% 9% 40%	6470
August	1st to 10th	Day	19% 5% 2 6% 5% 5% 6% 5% 6% 8% 32%	4234
	11th to 20th	Day	14% 5% 2 7% 4 5% 6% 5% 7% 8% 38%	4052
	21st to end	Day	15% 4 1 5% 3 4 4 3 5% 8% 48%	4312
September	1st to 10th	Day	16% 5% 2 5% 3 4 4 3 4 6% 47%	2400
	11th to 20th	Day	14% 5% 1 5% 3 3 3 4 6% 6% 50%	2400
	21st to end	Day	21% 8% 3 6% 3 4 3 3 5% 5% 38%	2104
October	1st to 10th	Day	18% 6% 2 5% 4 4 4 2 5% 6% 43%	1930
	11th to 20th	Day	18% 6% 2 6% 4 4 4 3 5% 7% 42%	1900
	21st to end	Day	17% 7% 2 6% 4 5% 3 3 4 7% 41%	2090
November	1st to 10th	Day	12% 6% 2 4 3 4 5% 3 5% 7% 49%	1804
	11th to 20th	Day	16% 7% 2 5% 4 4 5% 4 6% 6% 40%	1717
	21st to end	Day	17% 6% 2 6% 5% 5% 4 4 5% 7% 38%	1600
December	1st to 10th	Day	14% 8% 3 8% 5% 6% 5% 4 6% 7% 34%	2600
	11th to 20th	Day	22% 11% 3 5% 3 4 5% 4 4 6% 33%	2990
	21st to end	Day	19% 10% 4 9% 5% 5% 5% 4 6% 8% 25%	3960
January	1st to 10th	Night	12% 9% 3 10% 5% 5% 5% 3 5% 8% 35%	6349
	11th to 20th	Night	13% 9% 4 8% 5% 5% 6% 4 6% 7% 34%	5973
	21st to end	Night	18% 8% 3 7% 5% 5% 4 4 6% 7% 35%	6490
February	1st to 10th	Night	16% 9% 3 7% 5% 4 4 4 5% 7% 35%	2600
	11th to 20th	Night	15% 10% 3 8% 4 4 4 4 6% 6% 36%	2504
	21st to end	Night	17% 8% 4 7% 5% 4 4 3 5% 6% 36%	1980
March	1st to 10th	Night	18% 9% 2 7% 4 3 3 3 5% 6% 39%	5052
	11th to 20th	Night	11% 7% 2 6% 4 4 4 4 5% 7% 47%	4980
	21st to end	Night	14% 8% 2 7% 5% 4 4 4 5% 5% 42%	5341
April	1st to 10th	Night	18% 10% 3 6% 6% 4 4 4 5% 7% 33%	2000
	11th to 20th	Night	15% 7% 3 6% 4 3 4 4 6% 8% 40%	1975
	21st to end	Night	19% 5% 2 5% 4 4 4 4 5% 7% 42%	2000
May	1st to 10th	Night	30% 7% 2 6% 4 4 4 3 5% 6% 28%	4041
	11th to 20th	Night	26% 7% 3 6% 4 3 3 3 5% 7% 32%	3575
	21st to end	Night	21% 7% 3 5% 4 3 4 3 5% 8% 37%	3920
June	1st to 10th	Night	14% 5% 2 6% 4 5% 4 3 6% 7% 44%	1600
	11th to 20th	Night	14% 6% 2 6% 5% 4 4 5% 7% 8% 41%	1600
	21st to end	Night	11% 4 2 4 5% 5% 5% 4 7% 10% 43%	1600
July	1st to 10th	Night	9% 6% 2 7% 5% 5% 5% 4 6% 10% 41%	3598
	11th to 20th	Night	11% 6% 3 7% 6% 5% 6% 5% 8% 10% 32%	3597
	21st to end	Night	12% 6% 2 5% 4 4 4 4 5% 8% 44%	4376
August	1st to 10th	Night	20% 5% 2 6% 4 4 4 4 7% 8% 36%	2915
	11th to 20th	Night	16% 7% 2 6% 3 4 4 3 6% 7% 40%	2964
	21st to end	Night	15% 4 2 5% 3 4 5% 3 5% 8% 45%	3586
September	1st to 10th	Night	15% 4 2 6% 3 4 4 3 4 7% 47%	2000
	11th to 20th	Night	14% 5% 2 5% 3 2 3 3 5% 7% 52%	2000
	21st to end	Night	21% 6% 2 5% 3 4 4 3 5% 7% 39%	2292
October	1st to 10th	Night	19% 6% 2 4 4 3 3 3 4 6% 45%	2317
	11th to 20th	Night	16% 5% 2 5% 3 4 3 3 5% 7% 47%	2280
	21st to end	Night	18% 7% 2 5% 3 4 4 4 5% 6% 43%	2508
November	1st to 10th	Night	10% 6% 2 5% 4 3 4 4 4 5% 53%	2494
	11th to 20th	Night	16% 8% 2 5% 5% 3 4 3 5% 6% 42%	2680
	21st to end	Night	16% 6% 2 6% 4 4 5% 4 5% 8% 39%	2800
December	1st to 10th	Night	12% 8% 4 7% 4 5% 5% 4 6% 7% 38%	4580
	11th to 20th	Night	22% 8% 3 5% 4 4 4 4 5% 6% 34%	5205
	21st to end	Night	18% 10% 3 8% 6% 5% 5% 4 5% 7% 28%	6996

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	48% 4 12% 22% 12% 2	3598
	11th to 20th	Day	54% 4 12% 15% 12% 3	3986
	21st to end	Day	52% 5% 12% 19% 12% 1	4466
February	1st to 10th	Day	53% 4 12% 20% 10% 1	1800
	11th to 20th	Day	48% 6% 11% 23% 11% 2	1789
	21st to end	Day	52% 4 11% 20% 10% 3	1650
March	1st to 10th	Day	45% 4 11% 22% 12% 5%	4797
	11th to 20th	Day	40% 5% 14% 27% 10% 5%	4980
	21st to end	Day	43% 6% 10% 19% 18% 4	5589
April	1st to 10th	Day	48% 5% 11% 18% 14% 4	2400
	11th to 20th	Day	43% 5% 11% 20% 16% 3	2374
	21st to end	Day	44% 5% 11% 22% 15% 4	2410
May	1st to 10th	Day	52% 7% 11% 18% 11% 1	5897
	11th to 20th	Day	51% 8% 11% 19% 11% 1	6322
	21st to end	Day	42% 7% 13% 22% 14% 2	6949
June	1st to 10th	Day	41% 8% 11% 22% 17% 2	2800
	11th to 20th	Day	42% 8% 13% 22% 13% 2	2800
	21st to end	Day	34% 9% 14% 26% 16% 1	2800
July	1st to 10th	Day	37% 10% 12% 24% 15% 1	6290
	11th to 20th	Day	40% 11% 16% 21% 11% 1	6285
	21st to end	Day	39% 8% 10% 21% 21% 1	6285
August	1st to 10th	Day	46% 10% 12% 22% 10%	4221
	11th to 20th	Day	40% 8% 11% 27% 13% 1	4091
	21st to end	Day	34% 6% 11% 30% 17% 2	4312
September	1st to 10th	Day	39% 6% 10% 22% 20% 3	2400
	11th to 20th	Day	33% 6% 11% 26% 21% 3	2400
	21st to end	Day	47% 7% 9% 16% 19% 2	2104
October	1st to 10th	Day	38% 6% 8% 24% 19% 5%	3190
	11th to 20th	Day	30% 6% 13% 27% 21% 3	3140
	21st to end	Day	28% 4 14% 31% 22% 1	3428
November	1st to 10th	Day	34% 5% 15% 24% 19% 3	1804
	11th to 20th	Day	43% 6% 12% 21% 15% 3	1717
	21st to end	Day	46% 5% 11% 27% 10% 1	1600
December	1st to 10th	Day	47% 7% 14% 22% 8% 2	2600
	11th to 20th	Day	51% 5% 14% 23% 6% 1	2986
	21st to end	Day	54% 7% 17% 13% 8% 1	3960
January	1st to 10th	Night	46% 6% 13% 21% 12% 2	6349
	11th to 20th	Night	46% 5% 15% 18% 12% 4	5973
	21st to end	Night	47% 6% 11% 21% 14% 1	6490
February	1st to 10th	Night	48% 6% 13% 23% 8% 1	2600
	11th to 20th	Night	47% 5% 12% 20% 15% 2	2506
	21st to end	Night	48% 5% 10% 20% 14% 3	1980
March	1st to 10th	Night	46% 5% 10% 22% 12% 5%	5052
	11th to 20th	Night	36% 5% 15% 28% 10% 5%	4980
	21st to end	Night	42% 5% 10% 18% 22% 3	5341
April	1st to 10th	Night	51% 5% 9% 19% 14% 3	2000
	11th to 20th	Night	41% 6% 11% 22% 17% 3	1975
	21st to end	Night	40% 6% 11% 22% 17% 4	2000
May	1st to 10th	Night	56% 6% 8% 16% 11% 3	4068
	11th to 20th	Night	50% 8% 11% 19% 11% 1	3576
	21st to end	Night	45% 6% 11% 21% 13% 3	3927
June	1st to 10th	Night	38% 7% 11% 23% 19% 2	1600
	11th to 20th	Night	39% 9% 12% 22% 17% 2	1600
	21st to end	Night	33% 9% 14% 25% 18% 1	1600
July	1st to 10th	Night	38% 9% 13% 20% 16% 4	3560
	11th to 20th	Night	43% 10% 15% 19% 12% 1	3552
	21st to end	Night	36% 8% 12% 21% 22% 1	4248
August	1st to 10th	Night	45% 8% 14% 22% 10% 1	2904
	11th to 20th	Night	40% 7% 11% 24% 17% 1	2991
	21st to end	Night	36% 7% 11% 29% 16% 2	3586
September	1st to 10th	Night	37% 7% 11% 22% 20% 3	2000
	11th to 20th	Night	32% 5% 9% 27% 23% 3	2000
	21st to end	Night	45% 5% 10% 19% 20% 2	2292
October	1st to 10th	Night	39% 5% 11% 22% 21% 1	3837
	11th to 20th	Night	29% 6% 10% 28% 23% 4	3779
	21st to end	Night	29% 4 12% 30% 23% 2	4120
November	1st to 10th	Night	34% 5% 11% 26% 21% 4	2494
	11th to 20th	Night	43% 4 10% 23% 16% 4	2680
	21st to end	Night	43% 5% 14% 25% 12% 1	2800
December	1st to 10th	Night	44% 6% 15% 27% 8%	4580
	11th to 20th	Night	49% 5% 14% 20% 10% 1	5208
	21st to end	Night	54% 7% 12% 18% 10%	6996

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	34% 25% 28% 10% 4	200
	11th to 20th	Day	41% 21% 27% 10% 1	283
	21st to end	Day	30% 30% 29% 8% 3	330
February	1st to 10th	Day	32% 28% 28% 11% 2	300
	11th to 20th	Day	41% 25% 28% 5% 1	327
	21st to end	Day	33% 24% 25% 16% 2	414
March	1st to 10th	Day	32% 21% 28% 16% 3	500
	11th to 20th	Day	29% 25% 27% 14% 4 1	500
	21st to end	Day	28% 25% 30% 12% 4 2	550
April	1st to 10th	Day	33% 21% 27% 13% 5% 1	500
	11th to 20th	Day	28% 22% 24% 17% 7% 3	492
	21st to end	Day	27% 18% 31% 15% 6% 2	500
May	1st to 10th	Day	32% 17% 29% 14% 7% 1	503
	11th to 20th	Day	26% 18% 27% 17% 10% 2	527
	21st to end	Day	24% 11% 27% 19% 14% 5%	573
June	1st to 10th	Day	19% 14% 30% 21% 13% 2	530
	11th to 20th	Day	19% 12% 28% 25% 13% 3	530
	21st to end	Day	14% 11% 32% 27% 14% 3	530
July	1st to 10th	Day	10% 7% 25% 32% 19% 7%	525
	11th to 20th	Day	6% 8% 28% 28% 25% 5%	524
	21st to end	Day	12% 8% 27% 32% 17% 4	576
August	1st to 10th	Day	13% 7% 21% 30% 21% 7%	526
	11th to 20th	Day	14% 6% 25% 29% 20% 6%	519
	21st to end	Day	15% 7% 24% 28% 16% 10%	583
September	1st to 10th	Day	18% 9% 23% 24% 18% 8%	530
	11th to 20th	Day	15% 4 24% 28% 22% 7%	530
	21st to end	Day	32% 10% 22% 20% 12% 4	530
October	1st to 10th	Day	24% 7% 24% 24% 15% 6%	502
	11th to 20th	Day	21% 14% 29% 21% 12% 2	490
	21st to end	Day	22% 17% 32% 19% 9% 1	539
November	1st to 10th	Day	20% 17% 26% 22% 12% 2	418
	11th to 20th	Day	24% 20% 31% 18% 8% 1	317
	21st to end	Day	28% 23% 30% 15% 5%	200
December	1st to 10th	Day	31% 24% 30% 11% 4 1	200
	11th to 20th	Day	32% 23% 31% 11% 4	200
	21st to end	Day	29% 22% 29% 17% 3	220
January	1st to 10th	Night	26% 20% 33% 18% 3	800
	11th to 20th	Night	27% 18% 29% 23% 4	800
	21st to end	Night	22% 22% 33% 22% 2	880
February	1st to 10th	Night	25% 18% 31% 24% 2	800
	11th to 20th	Night	28% 23% 31% 17% 1	783
	21st to end	Night	27% 21% 31% 19% 2	660
March	1st to 10th	Night	25% 21% 30% 21% 3	800
	11th to 20th	Night	28% 20% 27% 20% 5%	800
	21st to end	Night	23% 18% 34% 19% 5%	880
April	1st to 10th	Night	27% 20% 30% 18% 5%	800
	11th to 20th	Night	21% 17% 32% 24% 7%	791
	21st to end	Night	24% 15% 29% 26% 6%	800
May	1st to 10th	Night	24% 11% 27% 28% 11%	608
	11th to 20th	Night	24% 8% 29% 29% 10%	394
	21st to end	Night	15% 11% 21% 34% 17% 2	433
June	1st to 10th	Night	15% 5% 28% 33% 20%	400
	11th to 20th	Night	16% 5% 26% 38% 14% 1	400
	21st to end	Night	12% 3 27% 41% 17%	400
July	1st to 10th	Night	14% 4 20% 37% 23% 2	390
	11th to 20th	Night	9% 2 19% 44% 25% 2	388
	21st to end	Night	13% 3 19% 41% 23% 1	632
August	1st to 10th	Night	15% 2 15% 39% 28% 2	597
	11th to 20th	Night	15% 4 15% 35% 27% 3	644
	21st to end	Night	14% 4 18% 34% 28% 3	880
September	1st to 10th	Night	16% 4 21% 35% 22% 3	800
	11th to 20th	Night	15% 5% 18% 31% 28% 4	800
	21st to end	Night	23% 7% 20% 30% 18% 2	800
October	1st to 10th	Night	22% 8% 23% 26% 19% 3	773
	11th to 20th	Night	18% 14% 26% 29% 12%	760
	21st to end	Night	22% 14% 25% 29% 9%	836
November	1st to 10th	Night	14% 13% 32% 30% 11% 1	780
	11th to 20th	Night	22% 19% 27% 25% 7% 1	800
	21st to end	Night	22% 18% 29% 25% 6%	800
December	1st to 10th	Night	25% 19% 32% 19% 5%	800
	11th to 20th	Night	24% 17% 33% 23% 5%	800
	21st to end	Night	22% 18% 30% 27% 2	880

Page generated at 2025-10-01 01:39:01. Version ac07

Copyright © 2025 Attilla Danko.