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 2024-11-05.

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 6% 5% 4 5% 4 6% 7% 37%	101353
	Night	17% 7% 3 6% 4 4 4 4 5% 7% 38%	97645
Transparency	Day	43% 7% 12% 22% 14% 2	104991
	Night	43% 6% 12% 22% 15% 2	102147
Seeing	Day	23% 15% 27% 20% 11% 3	14850
	Night	21% 13% 27% 27% 11% 1	24241

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 7% 4 5% 4 3 5% 5% 39%	2517
	11th to 20th	Day	13% 13% 4 12% 7% 6% 5% 4 5% 6% 25%	2780
	21st to end	Day	19% 13% 3 8% 6% 4 5% 4 4 5% 27%	3124
February	1st to 10th	Day	16% 13% 3 7% 5% 5% 4 3 5% 6% 33%	1710
	11th to 20th	Day	15% 8% 3 8% 5% 5% 5% 3 6% 6% 35%	1688
	21st to end	Day	19% 10% 3 10% 4 4 4 3 4 5% 34%	1570
March	1st to 10th	Day	24% 8% 2 5% 4 4 4 4 5% 6% 34%	3339
	11th to 20th	Day	10% 8% 2 7% 5% 5% 5% 4 5% 8% 40%	3480
	21st to end	Day	18% 10% 2 5% 4 3 3 3 4 5% 42%	3897
April	1st to 10th	Day	17% 8% 3 8% 5% 4 4 4 5% 6% 36%	2280
	11th to 20th	Day	17% 7% 2 5% 5% 4 5% 3 6% 6% 39%	2254
	21st to end	Day	18% 5% 2 6% 5% 4 4 4 6% 6% 38%	2289
May	1st to 10th	Day	29% 6% 2 5% 4 4 4 3 5% 6% 31%	4082
	11th to 20th	Day	24% 8% 3 7% 5% 5% 5% 4 5% 7% 28%	4398
	21st to end	Day	12% 5% 2 5% 4 4 5% 4 7% 10% 42%	4823
June	1st to 10th	Day	13% 6% 3 6% 5% 4 5% 5% 6% 7% 40%	2660
	11th to 20th	Day	14% 5% 2 6% 5% 5% 5% 4 6% 10% 38%	2660
	21st to end	Day	10% 5% 2 5% 5% 4 5% 5% 7% 10% 41%	2660
July	1st to 10th	Day	7% 5% 2 7% 6% 6% 7% 5% 8% 10% 38%	4440
	11th to 20th	Day	7% 5% 2 7% 5% 6% 6% 5% 7% 10% 40%	4440
	21st to end	Day	11% 7% 2 7% 5% 5% 6% 5% 6% 8% 37%	4498
August	1st to 10th	Day	19% 5% 2 6% 5% 5% 6% 5% 6% 8% 32%	4104
	11th to 20th	Day	13% 5% 2 6% 4 5% 6% 5% 7% 7% 39%	3926
	21st to end	Day	16% 4 1 5% 3 4 4 3 5% 8% 47%	4180
September	1st to 10th	Day	17% 5% 2 5% 3 4 4 3 4 6% 46%	2280
	11th to 20th	Day	15% 5% 1 5% 3 3 3 3 6% 6% 50%	2280
	21st to end	Day	21% 8% 3 6% 3 4 3 3 6% 5% 39%	1999
October	1st to 10th	Day	19% 7% 2 5% 4 4 4 2 5% 6% 43%	1900
	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	13% 6% 3 4 3 4 5% 3 6% 7% 48%	1751
	11th to 20th	Day	16% 7% 2 5% 5% 4 5% 4 6% 6% 40%	1632
	21st to end	Day	17% 6% 2 6% 5% 5% 4 4 5% 7% 38%	1520
December	1st to 10th	Day	18% 10% 3 8% 5% 5% 4 4 6% 7% 30%	1520
	11th to 20th	Day	19% 10% 4 7% 4 4 5% 4 5% 6% 33%	1910
	21st to end	Day	21% 9% 4 10% 6% 5% 5% 4 6% 7% 24%	2772
January	1st to 10th	Night	15% 10% 3 8% 4 5% 4 3 5% 7% 35%	4429
	11th to 20th	Night	17% 10% 5% 8% 4 4 5% 4 6% 6% 31%	4179
	21st to end	Night	24% 10% 3 8% 5% 4 4 3 5% 6% 29%	4532
February	1st to 10th	Night	16% 8% 3 7% 5% 4 4 4 5% 7% 36%	2470
	11th to 20th	Night	15% 10% 3 7% 4 4 4 4 6% 6% 36%	2376
	21st to end	Night	17% 9% 4 7% 5% 4 4 3 5% 6% 36%	1884
March	1st to 10th	Night	23% 10% 2 6% 5% 3 3 3 4 5% 35%	3510
	11th to 20th	Night	11% 8% 3 6% 4 4 5% 4 5% 7% 43%	3480
	21st to end	Night	16% 8% 2 6% 4 3 3 3 4 5% 44%	3733
April	1st to 10th	Night	17% 9% 3 6% 6% 4 4 4 5% 7% 33%	1900
	11th to 20th	Night	15% 7% 3 6% 4 3 4 3 5% 8% 41%	1875
	21st to end	Night	19% 5% 2 5% 4 3 4 4 5% 7% 42%	1900
May	1st to 10th	Night	29% 7% 2 6% 4 4 4 3 5% 6% 30%	2821
	11th to 20th	Night	26% 8% 3 7% 5% 4 4 3 5% 7% 28%	2495
	21st to end	Night	13% 6% 2 5% 5% 4 5% 4 7% 9% 40%	2732
June	1st to 10th	Night	14% 5% 2 6% 4 4 4 3 6% 8% 44%	1520
	11th to 20th	Night	13% 6% 2 6% 5% 4 4 5% 7% 8% 41%	1520
	21st to end	Night	10% 4 2 4 5% 5% 5% 4 7% 10% 43%	1520
July	1st to 10th	Night	8% 5% 2 7% 5% 5% 6% 4 6% 9% 42%	2520
	11th to 20th	Night	8% 5% 2 6% 5% 5% 5% 5% 7% 11% 41%	2520
	21st to end	Night	15% 7% 2 6% 4 5% 4 4 5% 7% 41%	3050
August	1st to 10th	Night	21% 5% 2 6% 4 4 4 4 7% 8% 35%	2825
	11th to 20th	Night	16% 7% 2 6% 3 4 4 3 6% 8% 40%	2871
	21st to end	Night	15% 4 2 5% 3 4 5% 3 5% 8% 45%	3476
September	1st to 10th	Night	15% 4 2 6% 3 4 4 3 4 7% 47%	1900
	11th to 20th	Night	14% 5% 1 4 3 2 3 3 4 6% 53%	1900
	21st to end	Night	21% 5% 2 5% 3 4 5% 3 5% 6% 41%	2177
October	1st to 10th	Night	19% 6% 2 4 4 3 3 3 4 6% 44%	2280
	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 3 4 4 5% 52%	2427
	11th to 20th	Night	16% 8% 2 5% 5% 3 4 3 5% 6% 42%	2546
	21st to end	Night	16% 5% 2 7% 4 4 5% 4 5% 8% 39%	2660
December	1st to 10th	Night	18% 9% 3 7% 4 4 4 4 6% 6% 34%	2660
	11th to 20th	Night	19% 8% 3 6% 4 4 5% 4 5% 6% 36%	3285
	21st to end	Night	18% 9% 3 8% 6% 5% 5% 4 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	2289
May	1st to 10th	Day	53% 6% 8% 20% 12% 1	4120
	11th to 20th	Day	53% 8% 13% 16% 8% 2	4402
	21st to end	Day	36% 8% 14% 25% 16% 3	4837
June	1st to 10th	Day	41% 8% 12% 22% 16% 2	2660
	11th to 20th	Day	41% 8% 13% 22% 13% 2	2660
	21st to end	Day	34% 9% 13% 27% 16% 1	2660
July	1st to 10th	Day	38% 10% 13% 25% 12% 2	4370
	11th to 20th	Day	34% 10% 15% 24% 15% 1	4365
	21st to end	Day	43% 8% 10% 19% 18% 1	4355
August	1st to 10th	Day	47% 10% 12% 22% 9%	4091
	11th to 20th	Day	40% 8% 11% 27% 13% 1	3965
	21st to end	Day	34% 6% 11% 30% 17% 2	4180
September	1st to 10th	Day	40% 6% 10% 21% 20% 3	2280
	11th to 20th	Day	33% 6% 11% 25% 22% 3	2280
	21st to end	Day	46% 7% 9% 17% 20% 2	1999
October	1st to 10th	Day	38% 6% 8% 24% 20% 4	3160
	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	35% 5% 15% 24% 19% 3	1751
	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% 6% 11% 22% 16% 5%	1900
May	1st to 10th	Night	54% 6% 7% 18% 12% 2	2848
	11th to 20th	Night	54% 9% 11% 14% 10% 1	2496
	21st to end	Night	38% 8% 14% 23% 13% 4	2739
June	1st to 10th	Night	38% 7% 11% 23% 19% 2	1520
	11th to 20th	Night	38% 9% 12% 22% 17% 2	1520
	21st to end	Night	33% 9% 14% 26% 17% 1	1520
July	1st to 10th	Night	38% 8% 15% 18% 16% 5%	2480
	11th to 20th	Night	35% 9% 15% 24% 16% 1	2472
	21st to end	Night	41% 8% 12% 16% 21% 2	2953
August	1st to 10th	Night	45% 8% 14% 22% 10%	2814
	11th to 20th	Night	41% 7% 11% 23% 17% 1	2898
	21st to end	Night	36% 7% 11% 28% 16% 2	3476
September	1st to 10th	Night	38% 7% 11% 21% 20% 3	1900
	11th to 20th	Night	32% 5% 9% 27% 23% 3	1900
	21st to end	Night	44% 5% 10% 19% 20% 2	2177
October	1st to 10th	Night	39% 6% 11% 22% 21% 1	3800
	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% 20% 4	2427
	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	28% 18% 31% 15% 6% 2	460
May	1st to 10th	Day	33% 16% 28% 14% 7% 2	463
	11th to 20th	Day	26% 17% 26% 18% 11% 2	487
	21st to end	Day	21% 11% 27% 20% 15% 5%	529
June	1st to 10th	Day	19% 13% 30% 22% 14% 2	490
	11th to 20th	Day	17% 12% 29% 26% 14% 3	490
	21st to end	Day	14% 11% 33% 25% 14% 3	490
July	1st to 10th	Day	11% 7% 25% 31% 19% 7%	485
	11th to 20th	Day	5% 7% 28% 29% 25% 5%	484
	21st to end	Day	12% 9% 27% 31% 17% 4	532
August	1st to 10th	Day	14% 7% 21% 30% 21% 7%	486
	11th to 20th	Day	14% 5% 26% 29% 19% 6%	479
	21st to end	Day	15% 7% 23% 29% 16% 10%	539
September	1st to 10th	Day	19% 8% 24% 22% 18% 8%	490
	11th to 20th	Day	16% 4 24% 28% 21% 7%	490
	21st to end	Day	32% 11% 21% 19% 13% 4	490
October	1st to 10th	Day	25% 8% 24% 23% 15% 6%	490
	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	21% 16% 25% 23% 13% 2	401
	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	24% 14% 29% 26% 7%	760
May	1st to 10th	Night	24% 11% 27% 28% 11%	578
	11th to 20th	Night	24% 8% 28% 30% 10%	374
	21st to end	Night	14% 10% 21% 35% 18% 2	411
June	1st to 10th	Night	14% 5% 28% 33% 20%	380
	11th to 20th	Night	14% 5% 27% 38% 15% 1	380
	21st to end	Night	11% 3 28% 42% 15%	380
July	1st to 10th	Night	14% 4 21% 37% 23% 2	370
	11th to 20th	Night	8% 1 19% 45% 25% 2	368
	21st to end	Night	13% 3 20% 40% 23% 1	600
August	1st to 10th	Night	15% 2 16% 39% 27% 2	567
	11th to 20th	Night	15% 4 15% 36% 27% 3	611
	21st to end	Night	14% 3 18% 34% 28% 3	836
September	1st to 10th	Night	16% 4 21% 35% 21% 3	760
	11th to 20th	Night	15% 5% 19% 29% 28% 4	760
	21st to end	Night	23% 7% 21% 29% 18% 2	760
October	1st to 10th	Night	22% 8% 23% 26% 18% 3	760
	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% 29% 11% 1	760
	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 2024-11-03 02:11:12. Version ac07

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