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 2024-04-25.

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% 3 6% 5% 3 5% 5% 5% 7% 37%	83369
	Night	16% 7% 3 5% 5% 3 4 5% 5% 7% 39%	85751
Transparency	Day	45% 6% 12% 21% 13% 2	83078
	Night	44% 6% 12% 22% 14% 2	85562
Seeing	Day	23% 15% 27% 20% 11% 3	14076
	Night	21% 14% 27% 27% 11% 1	23646

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	15% 9% 4 6% 5% 3 5% 4 5% 5% 40%	2517
	11th to 20th	Day	13% 13% 5% 11% 9% 4 5% 5% 5% 6% 25%	2780
	21st to end	Day	19% 12% 4 7% 7% 3 5% 5% 4 6% 27%	3124
February	1st to 10th	Day	16% 12% 3 6% 6% 4 5% 4 5% 6% 33%	1710
	11th to 20th	Day	15% 7% 4 7% 6% 4 6% 4 6% 7% 36%	1688
	21st to end	Day	19% 9% 3 9% 5% 2 5% 4 4 5% 34%	1570
March	1st to 10th	Day	24% 8% 2 5% 5% 3 4 5% 5% 6% 34%	3339
	11th to 20th	Day	10% 7% 3 6% 6% 4 5% 5% 5% 8% 40%	3480
	21st to end	Day	19% 9% 3 4 4 3 4 3 4 6% 42%	3897
April	1st to 10th	Day	17% 7% 3 7% 6% 3 5% 5% 5% 6% 36%	2280
	11th to 20th	Day	17% 7% 2 4 5% 3 6% 4 5% 7% 39%	2254
	21st to end	Day	18% 5% 2 6% 6% 3 5% 4 6% 7% 37%	2218
May	1st to 10th	Day	20% 7% 3 5% 5% 3 5% 5% 6% 7% 35%	2340
	11th to 20th	Day	21% 6% 3 6% 5% 3 6% 4 5% 7% 33%	2478
	21st to end	Day	15% 6% 3 5% 4 3 5% 5% 6% 9% 39%	2725
June	1st to 10th	Day	13% 6% 3 5% 6% 3 5% 6% 6% 8% 39%	2520
	11th to 20th	Day	14% 5% 3 6% 5% 3 6% 5% 6% 10% 37%	2520
	21st to end	Day	11% 4 2 4 5% 3 5% 6% 7% 11% 41%	2520
July	1st to 10th	Day	10% 5% 2 5% 6% 4 6% 6% 6% 9% 39%	2520
	11th to 20th	Day	7% 4 2 5% 6% 4 6% 6% 7% 10% 43%	2520
	21st to end	Day	10% 6% 3 7% 6% 4 7% 6% 6% 8% 38%	2565
August	1st to 10th	Day	10% 5% 2 6% 6% 4 8% 8% 7% 9% 36%	2327
	11th to 20th	Day	12% 5% 3 6% 6% 4 5% 6% 7% 8% 38%	2241
	21st to end	Day	15% 5% 2 5% 5% 4 6% 5% 6% 9% 40%	2376
September	1st to 10th	Day	18% 5% 2 5% 4 4 4 4 4 6% 44%	2160
	11th to 20th	Day	15% 5% 1 4 4 2 4 4 6% 6% 49%	2160
	21st to end	Day	18% 7% 3 5% 4 3 3 4 6% 6% 41%	1894
October	1st to 10th	Day	19% 7% 2 5% 4 3 4 3 5% 6% 42%	1800
	11th to 20th	Day	19% 6% 2 5% 4 3 4 4 5% 7% 40%	1800
	21st to end	Day	18% 7% 2 5% 5% 4 4 4 4 7% 39%	1980
November	1st to 10th	Day	13% 5% 3 4 4 2 4 4 5% 8% 48%	1712
	11th to 20th	Day	17% 7% 2 5% 5% 3 5% 5% 6% 7% 40%	1632
	21st to end	Day	17% 5% 3 5% 6% 4 5% 5% 5% 7% 38%	1520
December	1st to 10th	Day	18% 10% 4 7% 6% 4 4 5% 5% 7% 30%	1520
	11th to 20th	Day	19% 9% 4 6% 4 3 5% 5% 4 6% 33%	1910
	21st to end	Day	21% 9% 4 9% 7% 3 5% 5% 6% 7% 24%	2772
January	1st to 10th	Night	15% 9% 3 7% 5% 3 5% 4 5% 8% 35%	4429
	11th to 20th	Night	17% 10% 5% 7% 5% 3 6% 5% 6% 6% 31%	4179
	21st to end	Night	24% 9% 4 7% 6% 3 4 4 5% 6% 29%	4532
February	1st to 10th	Night	16% 8% 3 6% 6% 3 5% 5% 5% 7% 36%	2470
	11th to 20th	Night	15% 9% 4 6% 5% 3 4 5% 6% 6% 36%	2376
	21st to end	Night	18% 8% 4 6% 6% 3 4 4 5% 6% 36%	1884
March	1st to 10th	Night	23% 10% 3 6% 5% 3 3 4 4 5% 35%	3510
	11th to 20th	Night	11% 8% 3 5% 4 3 5% 5% 5% 7% 43%	3480
	21st to end	Night	16% 8% 3 6% 5% 2 4 4 4 5% 44%	3733
April	1st to 10th	Night	17% 9% 3 6% 7% 3 5% 5% 5% 7% 33%	1900
	11th to 20th	Night	16% 6% 4 5% 4 2 4 4 5% 9% 41%	1875
	21st to end	Night	20% 5% 2 4 4 2 4 5% 5% 7% 43%	1850
May	1st to 10th	Night	20% 7% 3 4 5% 3 4 4 5% 7% 37%	1628
	11th to 20th	Night	20% 6% 2 5% 4 3 5% 4 5% 8% 38%	1415
	21st to end	Night	14% 6% 2 4 5% 3 5% 4 5% 9% 41%	1550
June	1st to 10th	Night	14% 5% 2 5% 4 3 4 4 5% 8% 45%	1440
	11th to 20th	Night	14% 5% 3 5% 6% 2 4 6% 7% 8% 40%	1440
	21st to end	Night	10% 4 3 3 5% 3 5% 6% 7% 10% 44%	1440
July	1st to 10th	Night	11% 5% 3 5% 6% 3 6% 5% 6% 8% 40%	1440
	11th to 20th	Night	7% 4 2 5% 5% 4 6% 5% 7% 10% 46%	1440
	21st to end	Night	11% 6% 3 4 4 3 5% 5% 6% 10% 44%	1748
August	1st to 10th	Night	12% 4 2 5% 4 3 5% 5% 8% 10% 42%	1611
	11th to 20th	Night	13% 6% 2 7% 5% 4 6% 4 6% 8% 40%	1642
	21st to end	Night	13% 5% 2 5% 4 4 5% 5% 6% 9% 41%	1980
September	1st to 10th	Night	16% 4 2 5% 4 3 5% 4 4 7% 46%	1800
	11th to 20th	Night	14% 5% 2 4 3 2 3 4 4 6% 53%	1800
	21st to end	Night	18% 5% 2 4 4 2 5% 5% 5% 7% 43%	2062
October	1st to 10th	Night	19% 6% 2 4 4 2 3 4 4 6% 44%	2160
	11th to 20th	Night	18% 5% 2 4 4 3 3 3 5% 7% 46%	2160
	21st to end	Night	19% 7% 2 4 4 3 4 5% 4 6% 42%	2376
November	1st to 10th	Night	11% 6% 2 5% 4 2 4 4 4 5% 52%	2366
	11th to 20th	Night	17% 7% 3 5% 5% 3 4 4 5% 6% 42%	2546
	21st to end	Night	16% 5% 2 6% 5% 3 5% 5% 5% 8% 39%	2660
December	1st to 10th	Night	18% 8% 4 6% 5% 3 5% 5% 6% 6% 34%	2660
	11th to 20th	Night	19% 7% 3 5% 4 3 4 5% 6% 6% 36%	3285
	21st to end	Night	19% 9% 3 7% 7% 4 5% 5% 6% 8% 28%	4884

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	47% 4 14% 24% 9% 3	2518
	11th to 20th	Day	59% 4 12% 13% 10% 2	2780
	21st to end	Day	58% 5% 12% 18% 6% 1	3124
February	1st to 10th	Day	52% 4 13% 19% 10% 1	1710
	11th to 20th	Day	47% 6% 11% 23% 11% 2	1697
	21st to end	Day	53% 4 10% 20% 10% 4	1570
March	1st to 10th	Day	51% 4 11% 24% 9% 1	3339
	11th to 20th	Day	40% 5% 13% 26% 12% 3	3480
	21st to end	Day	45% 4 10% 22% 16% 2	3897
April	1st to 10th	Day	47% 5% 11% 19% 14% 4	2280
	11th to 20th	Day	43% 5% 11% 21% 16% 4	2254
	21st to end	Day	45% 5% 11% 21% 15% 3	2218
May	1st to 10th	Day	48% 6% 9% 21% 14% 3	2340
	11th to 20th	Day	49% 6% 11% 17% 13% 3	2482
	21st to end	Day	42% 8% 15% 21% 12% 2	2725
June	1st to 10th	Day	42% 8% 12% 21% 16% 2	2520
	11th to 20th	Day	42% 8% 13% 22% 13% 2	2520
	21st to end	Day	34% 9% 14% 27% 15% 1	2520
July	1st to 10th	Day	40% 10% 12% 20% 15% 2	2450
	11th to 20th	Day	33% 10% 14% 24% 17% 2	2445
	21st to end	Day	42% 9% 11% 20% 17% 2	2422
August	1st to 10th	Day	39% 11% 14% 22% 13%	2314
	11th to 20th	Day	41% 8% 12% 22% 15% 2	2241
	21st to end	Day	39% 9% 11% 22% 16% 3	2376
September	1st to 10th	Day	41% 6% 11% 21% 18% 3	2160
	11th to 20th	Day	34% 6% 11% 25% 21% 4	2160
	21st to end	Day	43% 7% 9% 17% 21% 2	1894
October	1st to 10th	Day	43% 7% 11% 23% 15% 2	1800
	11th to 20th	Day	43% 5% 12% 24% 15% 1	1800
	21st to end	Day	45% 5% 11% 24% 14% 2	1980
November	1st to 10th	Day	35% 5% 15% 24% 18% 3	1712
	11th to 20th	Day	43% 6% 12% 21% 15% 3	1632
	21st to end	Day	46% 5% 11% 27% 10% 1	1520
December	1st to 10th	Day	52% 7% 13% 18% 9%	1520
	11th to 20th	Day	50% 6% 13% 24% 6% 1	1906
	21st to end	Day	57% 7% 16% 14% 6%	2772
January	1st to 10th	Night	47% 6% 13% 23% 9% 2	4429
	11th to 20th	Night	52% 5% 16% 17% 9% 1	4179
	21st to end	Night	56% 5% 9% 20% 8% 1	4532
February	1st to 10th	Night	48% 6% 13% 23% 9% 1	2470
	11th to 20th	Night	47% 5% 12% 19% 16% 1	2378
	21st to end	Night	49% 5% 10% 20% 14% 3	1884
March	1st to 10th	Night	52% 5% 9% 22% 10% 1	3510
	11th to 20th	Night	39% 6% 13% 28% 12% 2	3480
	21st to end	Night	42% 4 9% 20% 20% 4	3733
April	1st to 10th	Night	50% 5% 9% 19% 15% 3	1900
	11th to 20th	Night	41% 6% 11% 22% 17% 3	1875
	21st to end	Night	41% 5% 11% 22% 16% 5%	1850
May	1st to 10th	Night	46% 6% 9% 21% 13% 4	1628
	11th to 20th	Night	45% 7% 11% 17% 18% 2	1416
	21st to end	Night	40% 8% 13% 22% 14% 2	1551
June	1st to 10th	Night	38% 8% 11% 23% 19% 2	1440
	11th to 20th	Night	40% 9% 12% 21% 17% 2	1440
	21st to end	Night	33% 9% 14% 26% 17% 1	1440
July	1st to 10th	Night	41% 10% 12% 19% 14% 4	1400
	11th to 20th	Night	32% 9% 15% 24% 18% 2	1392
	21st to end	Night	34% 9% 16% 22% 17% 2	1651
August	1st to 10th	Night	35% 9% 15% 25% 15% 1	1600
	11th to 20th	Night	41% 8% 12% 19% 19% 1	1642
	21st to end	Night	38% 8% 12% 21% 17% 3	1980
September	1st to 10th	Night	39% 7% 11% 21% 19% 4	1800
	11th to 20th	Night	32% 5% 9% 27% 23% 3	1800
	21st to end	Night	41% 5% 10% 20% 21% 2	2062
October	1st to 10th	Night	42% 6% 11% 24% 16% 2	2160
	11th to 20th	Night	39% 6% 11% 27% 15% 2	2160
	21st to end	Night	43% 5% 10% 24% 17% 1	2376
November	1st to 10th	Night	34% 5% 11% 26% 20% 4	2366
	11th to 20th	Night	43% 4 10% 22% 16% 4	2546
	21st to end	Night	43% 5% 14% 25% 12% 1	2660
December	1st to 10th	Night	49% 6% 13% 20% 11%	2660
	11th to 20th	Night	48% 6% 13% 21% 11% 1	3288
	21st to end	Night	53% 7% 14% 19% 7%	4884

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	33% 23% 29% 11% 4	180
	11th to 20th	Day	40% 22% 26% 11% 1	254
	21st to end	Day	30% 30% 29% 8% 3	297
February	1st to 10th	Day	31% 27% 28% 12% 2	270
	11th to 20th	Day	38% 26% 30% 5% 1	295
	21st to end	Day	35% 23% 24% 16% 2	382
March	1st to 10th	Day	31% 21% 27% 17% 3	460
	11th to 20th	Day	30% 26% 26% 13% 4 1	460
	21st to end	Day	29% 24% 29% 12% 4 2	506
April	1st to 10th	Day	30% 22% 28% 14% 5% 1	460
	11th to 20th	Day	26% 21% 25% 18% 7% 3	452
	21st to end	Day	29% 19% 30% 14% 5% 2	437
May	1st to 10th	Day	32% 17% 29% 14% 7% 2	423
	11th to 20th	Day	26% 18% 26% 18% 10% 2	447
	21st to end	Day	21% 11% 26% 20% 15% 6%	485
June	1st to 10th	Day	18% 13% 31% 22% 14% 2	450
	11th to 20th	Day	18% 13% 30% 24% 12% 3	450
	21st to end	Day	13% 10% 33% 26% 14% 3	450
July	1st to 10th	Day	11% 7% 23% 31% 20% 8%	445
	11th to 20th	Day	5% 6% 29% 29% 26% 5%	444
	21st to end	Day	13% 8% 27% 31% 17% 4	488
August	1st to 10th	Day	13% 7% 21% 30% 22% 7%	446
	11th to 20th	Day	14% 4 26% 29% 20% 7%	439
	21st to end	Day	15% 7% 23% 30% 15% 10%	495
September	1st to 10th	Day	20% 8% 23% 21% 19% 9%	450
	11th to 20th	Day	16% 4 25% 27% 20% 7%	450
	21st to end	Day	27% 11% 22% 21% 14% 5%	450
October	1st to 10th	Day	25% 8% 22% 23% 16% 5%	450
	11th to 20th	Day	22% 14% 29% 22% 11% 2	450
	21st to end	Day	23% 18% 31% 18% 8% 1	495
November	1st to 10th	Day	22% 16% 25% 22% 13% 2	386
	11th to 20th	Day	25% 20% 29% 18% 8% 1	292
	21st to end	Day	24% 23% 32% 16% 5%	180
December	1st to 10th	Day	32% 24% 27% 12% 4 1	180
	11th to 20th	Day	31% 24% 31% 10% 4	180
	21st to end	Day	30% 22% 29% 16% 3	198
January	1st to 10th	Night	25% 19% 33% 19% 3	760
	11th to 20th	Night	27% 17% 29% 23% 4	760
	21st to end	Night	22% 23% 32% 22% 2	836
February	1st to 10th	Night	25% 18% 30% 25% 2	760
	11th to 20th	Night	26% 24% 32% 17% 1	743
	21st to end	Night	28% 22% 29% 19% 2	628
March	1st to 10th	Night	25% 20% 30% 22% 3	760
	11th to 20th	Night	28% 20% 27% 20% 5%	760
	21st to end	Night	23% 18% 33% 19% 5%	836
April	1st to 10th	Night	26% 20% 31% 19% 5%	760
	11th to 20th	Night	20% 16% 32% 24% 7%	751
	21st to end	Night	25% 14% 29% 26% 6%	740
May	1st to 10th	Night	23% 10% 27% 28% 11%	548
	11th to 20th	Night	24% 8% 29% 30% 9%	354
	21st to end	Night	14% 10% 22% 34% 18% 2	389
June	1st to 10th	Night	15% 4 28% 32% 21%	360
	11th to 20th	Night	15% 6% 28% 36% 16% 1	360
	21st to end	Night	12% 3 27% 43% 15%	360
July	1st to 10th	Night	15% 4 20% 36% 23% 2	350
	11th to 20th	Night	9% 1 19% 45% 25% 1	348
	21st to end	Night	13% 4 20% 40% 22% 1	568
August	1st to 10th	Night	15% 2 16% 40% 26% 2	537
	11th to 20th	Night	16% 4 14% 35% 28% 3	578
	21st to end	Night	14% 4 18% 33% 28% 3	792
September	1st to 10th	Night	17% 4 20% 35% 21% 3	720
	11th to 20th	Night	15% 5% 20% 28% 28% 4	720
	21st to end	Night	20% 7% 21% 30% 19% 2	720
October	1st to 10th	Night	23% 8% 22% 26% 18% 3	720
	11th to 20th	Night	19% 14% 26% 29% 11%	720
	21st to end	Night	24% 15% 26% 27% 8%	792
November	1st to 10th	Night	14% 13% 32% 29% 11% 1	740
	11th to 20th	Night	22% 19% 26% 25% 7% 1	760
	21st to end	Night	21% 18% 29% 25% 6%	760
December	1st to 10th	Night	25% 18% 32% 18% 6%	760
	11th to 20th	Night	23% 17% 33% 23% 4	760
	21st to end	Night	22% 18% 31% 27% 2	836

Page generated at 2024-04-22 09:25:39. Version ac07

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