Guadaloupe River State Park Bauer Unit
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Guadaloupe River State Park Bauer Unit clear sky chart from 2005-11-06 to 2026-09-29.

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	12% 6% 2 5% 4 4 4 3 5% 7% 48%	148861
	Night	14% 6% 2 5% 3 3 3 3 4 6% 50%	142988
Transparency	Day	36% 4 10% 22% 19% 10%	152653
	Night	35% 4 10% 21% 19% 12%	147263
Seeing	Day	14% 9% 23% 31% 19% 4	17351
	Night	17% 8% 25% 35% 14% 1	27182

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% 7% 3 5% 3 3 3 2 4 4 53%	5289
	11th to 20th	Day	14% 5% 2 4 3 3 2 3 4 5% 55%	5310
	21st to end	Day	23% 7% 2 5% 2 3 3 2 4 6% 42%	6363
February	1st to 10th	Day	18% 7% 2 6% 3 3 4 2 4 5% 46%	2100
	11th to 20th	Day	17% 7% 3 4 4 4 3 3 5% 6% 45%	2049
	21st to end	Day	17% 7% 2 4 3 2 2 3 4 5% 51%	1730
March	1st to 10th	Day	14% 6% 2 5% 3 3 3 2 4 6% 53%	4946
	11th to 20th	Day	14% 8% 2 6% 3 3 3 2 3 5% 51%	5090
	21st to end	Day	17% 8% 2 6% 3 3 3 3 5% 6% 46%	5583
April	1st to 10th	Day	15% 7% 3 7% 4 4 3 3 4 6% 44%	2310
	11th to 20th	Day	21% 7% 2 5% 4 4 4 3 4 5% 41%	2321
	21st to end	Day	16% 8% 2 6% 5% 4 4 3 4 6% 42%	2646
May	1st to 10th	Day	22% 8% 2 6% 4 4 4 3 5% 6% 36%	7617
	11th to 20th	Day	13% 6% 2 6% 4 4 4 3 6% 8% 44%	7627
	21st to end	Day	14% 7% 2 7% 5% 5% 6% 5% 7% 9% 34%	8392
June	1st to 10th	Day	7% 5% 2 5% 5% 6% 5% 5% 7% 9% 45%	2730
	11th to 20th	Day	9% 5% 2 6% 4 6% 5% 4 6% 8% 44%	2730
	21st to end	Day	7% 6% 2 6% 5% 6% 6% 5% 7% 9% 40%	2730
July	1st to 10th	Day	10% 6% 2 6% 4 5% 5% 4 5% 9% 44%	7680
	11th to 20th	Day	9% 5% 2 6% 5% 5% 6% 5% 7% 10% 39%	7680
	21st to end	Day	6% 4 2 5% 4 5% 5% 4 6% 9% 52%	8337
August	1st to 10th	Day	1 2 1 2 2 3 3 3 5% 8% 71%	5859
	11th to 20th	Day	2 2 1 3 3 3 3 4 7% 10% 62%	5483
	21st to end	Day	3 3 2 4 4 5% 4 4 6% 9% 56%	5873
September	1st to 10th	Day	10% 8% 2 7% 5% 5% 5% 4 5% 5% 45%	2310
	11th to 20th	Day	11% 5% 2 6% 5% 4 5% 5% 7% 10% 40%	2310
	21st to end	Day	8% 4 2 5% 4 5% 4 3 6% 8% 50%	2288
October	1st to 10th	Day	7% 4 1 5% 4 3 4 3 5% 6% 57%	2200
	11th to 20th	Day	13% 5% 2 5% 3 3 3 3 4 7% 53%	2095
	21st to end	Day	12% 4 2 4 3 3 3 2 4 5% 58%	2200
November	1st to 10th	Day	13% 8% 3 6% 4 3 4 3 5% 5% 46%	2058
	11th to 20th	Day	13% 6% 2 5% 4 4 4 3 4 6% 50%	1937
	21st to end	Day	17% 8% 2 5% 4 3 3 3 4 5% 45%	1890
December	1st to 10th	Day	26% 7% 3 7% 3 2 2 2 3 5% 39%	3030
	11th to 20th	Day	17% 8% 3 5% 4 3 4 3 4 5% 44%	3481
	21st to end	Day	14% 6% 2 4 3 2 2 2 3 4 59%	4587
January	1st to 10th	Night	15% 6% 2 4 2 3 2 2 3 5% 54%	7634
	11th to 20th	Night	11% 3 1 3 2 2 3 3 4 4 64%	7680
	21st to end	Night	27% 6% 2 5% 3 3 3 2 3 4 42%	7908
February	1st to 10th	Night	17% 8% 2 4 3 3 3 2 4 5% 49%	2520
	11th to 20th	Night	19% 8% 2 5% 2 2 2 2 3 5% 49%	2458
	21st to end	Night	20% 5% 2 4 3 4 3 3 4 5% 47%	2076
March	1st to 10th	Night	16% 7% 2 5% 4 3 3 3 5% 6% 45%	5130
	11th to 20th	Night	16% 8% 2 5% 3 3 2 2 3 4 52%	5090
	21st to end	Night	20% 9% 2 4 3 3 3 3 4 5% 44%	5588
April	1st to 10th	Night	15% 7% 2 5% 4 3 4 3 5% 7% 44%	2310
	11th to 20th	Night	20% 7% 2 5% 3 3 3 3 4 5% 44%	2243
	21st to end	Night	22% 7% 2 5% 4 2 3 2 4 4 45%	1973
May	1st to 10th	Night	25% 10% 3 6% 4 4 3 2 4 5% 34%	5266
	11th to 20th	Night	12% 5% 2 5% 4 4 4 4 6% 8% 45%	5265
	21st to end	Night	15% 7% 2 6% 5% 5% 4 4 6% 9% 37%	5793
June	1st to 10th	Night	8% 4 1 5% 3 3 3 3 5% 9% 57%	1890
	11th to 20th	Night	7% 4 1 4 4 4 3 3 5% 9% 55%	1890
	21st to end	Night	9% 5% 2 4 3 3 4 4 7% 8% 51%	1890
July	1st to 10th	Night	9% 6% 2 5% 3 4 4 4 6% 10% 48%	5308
	11th to 20th	Night	10% 5% 2 6% 4 4 5% 4 7% 10% 43%	5307
	21st to end	Night	7% 5% 2 4 3 3 4 3 6% 8% 54%	5770
August	1st to 10th	Night	2 1 1 2 2 2 2 2 4 7% 74%	4292
	11th to 20th	Night	3 3 1 3 3 3 3 4 6% 11% 60%	4583
	21st to end	Night	4 3 1 3 3 3 4 3 6% 9% 61%	5266
September	1st to 10th	Night	9% 5% 3 5% 4 3 4 4 5% 7% 50%	2310
	11th to 20th	Night	10% 6% 2 6% 3 4 4 4 6% 9% 45%	2310
	21st to end	Night	8% 5% 2 4 4 4 4 3 5% 9% 52%	2288
October	1st to 10th	Night	6% 4 2 5% 3 3 3 3 4 7% 61%	2200
	11th to 20th	Night	13% 4 2 5% 2 3 3 2 4 6% 56%	2283
	21st to end	Night	15% 4 1 3 2 2 2 2 3 4 61%	2640
November	1st to 10th	Night	15% 6% 2 5% 4 3 3 2 3 5% 54%	2460
	11th to 20th	Night	12% 6% 2 4 3 3 3 3 4 6% 56%	2678
	21st to end	Night	19% 6% 1 5% 3 3 4 2 4 6% 48%	2730
December	1st to 10th	Night	24% 8% 2 6% 3 3 3 2 4 5% 39%	4380
	11th to 20th	Night	21% 9% 2 5% 3 2 2 2 3 4 48%	4946
	21st to end	Night	17% 6% 2 3 2 2 2 2 3 4 57%	6633

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	37% 3 4 21% 24% 11%	5290
	11th to 20th	Day	34% 2 4 14% 25% 21%	5310
	21st to end	Day	46% 3 4 14% 23% 11%	6363
February	1st to 10th	Day	43% 2 5% 13% 21% 17%	2100
	11th to 20th	Day	42% 3 6% 19% 18% 12%	2059
	21st to end	Day	38% 2 5% 17% 21% 16%	1730
March	1st to 10th	Day	35% 2 5% 18% 17% 22%	4946
	11th to 20th	Day	39% 2 4 9% 16% 30%	5090
	21st to end	Day	40% 3 8% 18% 20% 10%	5585
April	1st to 10th	Day	43% 4 7% 17% 17% 12%	2310
	11th to 20th	Day	46% 3 6% 16% 18% 12%	2321
	21st to end	Day	45% 4 6% 19% 16% 10%	2646
May	1st to 10th	Day	49% 4 9% 20% 15% 4	7655
	11th to 20th	Day	39% 3 11% 19% 21% 7%	7631
	21st to end	Day	44% 5% 12% 26% 12% 1	8405
June	1st to 10th	Day	33% 6% 13% 27% 18% 3	2730
	11th to 20th	Day	37% 5% 10% 25% 19% 4	2730
	21st to end	Day	39% 6% 11% 25% 16% 3	2730
July	1st to 10th	Day	37% 6% 18% 34% 5% 1	7616
	11th to 20th	Day	38% 7% 18% 25% 11% 1	7611
	21st to end	Day	28% 5% 13% 33% 18% 2	8155
August	1st to 10th	Day	13% 4 12% 43% 24% 4	5845
	11th to 20th	Day	17% 4 24% 40% 13% 2	5519
	21st to end	Day	24% 6% 14% 30% 24% 2	5872
September	1st to 10th	Day	40% 4 10% 20% 17% 8%	2310
	11th to 20th	Day	37% 6% 14% 21% 17% 5%	2310
	21st to end	Day	32% 5% 10% 23% 17% 13%	2288
October	1st to 10th	Day	18% 3 6% 13% 25% 35%	3590
	11th to 20th	Day	24% 4 7% 20% 25% 21%	3387
	21st to end	Day	28% 3 5% 18% 32% 14%	3538
November	1st to 10th	Day	40% 4 6% 18% 20% 12%	2058
	11th to 20th	Day	36% 3 6% 18% 22% 15%	1937
	21st to end	Day	43% 3 5% 16% 19% 13%	1890
December	1st to 10th	Day	50% 2 4 18% 15% 10%	3030
	11th to 20th	Day	42% 4 8% 12% 21% 14%	3479
	21st to end	Day	32% 2 4 15% 29% 17%	4587
January	1st to 10th	Night	35% 3 5% 18% 24% 15%	7635
	11th to 20th	Night	26% 2 3 17% 29% 23%	7680
	21st to end	Night	48% 2 3 12% 22% 13%	7908
February	1st to 10th	Night	40% 2 6% 13% 21% 18%	2520
	11th to 20th	Night	40% 2 5% 18% 19% 15%	2458
	21st to end	Night	41% 2 6% 15% 19% 17%	2076
March	1st to 10th	Night	41% 3 5% 17% 17% 16%	5130
	11th to 20th	Night	39% 2 6% 11% 15% 26%	5090
	21st to end	Night	43% 3 7% 18% 18% 10%	5588
April	1st to 10th	Night	40% 4 9% 17% 15% 15%	2310
	11th to 20th	Night	44% 3 8% 14% 17% 14%	2243
	21st to end	Night	45% 3 9% 18% 16% 9%	1973
May	1st to 10th	Night	53% 3 9% 16% 13% 5%	5293
	11th to 20th	Night	38% 4 11% 18% 20% 8%	5266
	21st to end	Night	44% 5% 16% 25% 8% 2	5805
June	1st to 10th	Night	26% 4 16% 31% 19% 3	1890
	11th to 20th	Night	28% 5% 13% 29% 20% 4	1890
	21st to end	Night	30% 6% 18% 28% 16% 3	1890
July	1st to 10th	Night	32% 7% 25% 32% 5%	5265
	11th to 20th	Night	35% 8% 24% 24% 9%	5256
	21st to end	Night	28% 6% 17% 31% 16% 2	5641
August	1st to 10th	Night	11% 4 16% 47% 19% 4	4282
	11th to 20th	Night	19% 5% 30% 35% 9% 1	4613
	21st to end	Night	21% 8% 19% 33% 19% 1	5266
September	1st to 10th	Night	32% 6% 15% 22% 16% 8%	2310
	11th to 20th	Night	35% 7% 16% 23% 14% 5%	2310
	21st to end	Night	30% 6% 13% 23% 17% 12%	2288
October	1st to 10th	Night	16% 3 7% 15% 22% 36%	3590
	11th to 20th	Night	22% 3 8% 17% 29% 20%	3717
	21st to end	Night	27% 3 5% 18% 32% 16%	4252
November	1st to 10th	Night	36% 3 7% 18% 22% 14%	2460
	11th to 20th	Night	32% 4 7% 19% 20% 17%	2678
	21st to end	Night	39% 3 8% 17% 19% 14%	2730
December	1st to 10th	Night	49% 3 6% 15% 15% 12%	4380
	11th to 20th	Night	44% 2 5% 10% 21% 18%	4947
	21st to end	Night	35% 2 3 14% 29% 17%	6633

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	23% 16% 34% 20% 7%	330
	11th to 20th	Day	24% 17% 28% 25% 6% 1	330
	21st to end	Day	22% 20% 33% 20% 5%	363
February	1st to 10th	Day	28% 14% 30% 24% 4	330
	11th to 20th	Day	25% 20% 36% 15% 3	330
	21st to end	Day	24% 19% 40% 16% 1	273
March	1st to 10th	Day	24% 18% 40% 17% 1	330
	11th to 20th	Day	18% 18% 41% 19% 4	330
	21st to end	Day	20% 18% 36% 20% 6% 1	363
April	1st to 10th	Day	20% 16% 40% 21% 2	330
	11th to 20th	Day	23% 19% 35% 19% 4	359
	21st to end	Day	20% 15% 40% 21% 4	666
May	1st to 10th	Day	20% 14% 37% 24% 5%	753
	11th to 20th	Day	18% 10% 31% 32% 7% 2	775
	21st to end	Day	17% 7% 31% 32% 12% 1	844
June	1st to 10th	Day	8% 5% 20% 41% 23% 3	780
	11th to 20th	Day	10% 3 18% 47% 20% 2	780
	21st to end	Day	9% 3 14% 41% 27% 5%	780
July	1st to 10th	Day	11% 3 11% 37% 30% 8%	771
	11th to 20th	Day	8% 3 7% 37% 40% 5%	768
	21st to end	Day	4 3 7% 37% 41% 8%	849
August	1st to 10th	Day	3 1 5% 36% 43% 11%	712
	11th to 20th	Day	6% 1 5% 43% 36% 10%	557
	21st to end	Day	4 1 5% 33% 41% 16%	538
September	1st to 10th	Day	9% 3 9% 27% 39% 12%	360
	11th to 20th	Day	5% 1 5% 32% 46% 11%	360
	21st to end	Day	7% 2 9% 36% 34% 12%	354
October	1st to 10th	Day	6% 2 14% 38% 30% 9%	330
	11th to 20th	Day	9% 4 23% 41% 18% 5%	330
	21st to end	Day	18% 12% 27% 25% 15% 3	363
November	1st to 10th	Day	18% 9% 25% 30% 14% 4	330
	11th to 20th	Day	20% 10% 29% 28% 10% 3	330
	21st to end	Day	23% 18% 32% 15% 9% 2	330
December	1st to 10th	Day	20% 9% 35% 26% 7% 2	330
	11th to 20th	Day	22% 15% 33% 23% 6% 1	330
	21st to end	Day	22% 11% 37% 22% 7% 1	363
January	1st to 10th	Night	20% 11% 29% 32% 8% 1	1050
	11th to 20th	Night	20% 13% 31% 29% 7%	1050
	21st to end	Night	25% 11% 30% 29% 6%	982
February	1st to 10th	Night	25% 11% 30% 28% 6%	840
	11th to 20th	Night	28% 14% 31% 25% 3	824
	21st to end	Night	26% 12% 39% 22% 2	692
March	1st to 10th	Night	24% 14% 35% 24% 3	683
	11th to 20th	Night	22% 11% 36% 27% 5%	630
	21st to end	Night	20% 12% 38% 26% 4	693
April	1st to 10th	Night	17% 14% 39% 27% 3	630
	11th to 20th	Night	23% 12% 39% 23% 2	623
	21st to end	Night	24% 9% 39% 22% 5% 1	630
May	1st to 10th	Night	20% 11% 40% 27% 3	630
	11th to 20th	Night	16% 7% 36% 34% 7%	621
	21st to end	Night	16% 9% 31% 34% 10%	683
June	1st to 10th	Night	8% 3 27% 40% 19% 1	630
	11th to 20th	Night	7% 3 33% 43% 13% 1	630
	21st to end	Night	9% 3 20% 45% 21% 2	630
July	1st to 10th	Night	11% 3 11% 46% 27% 2	615
	11th to 20th	Night	6% 2 13% 51% 26% 2	612
	21st to end	Night	6% 2 11% 49% 29% 3	690
August	1st to 10th	Night	2 1 9% 52% 33% 3	627
	11th to 20th	Night	6% 1 9% 52% 28% 4	624
	21st to end	Night	7% 2 7% 45% 35% 5%	693
September	1st to 10th	Night	10% 1 9% 41% 35% 4	630
	11th to 20th	Night	10% 1 10% 41% 34% 3	630
	21st to end	Night	10% 2 12% 38% 34% 4	624
October	1st to 10th	Night	7% 4 11% 47% 27% 4	600
	11th to 20th	Night	14% 4 20% 39% 21% 2	683
	21st to end	Night	16% 10% 21% 32% 20% 2	880
November	1st to 10th	Night	15% 8% 19% 40% 17% 1	820
	11th to 20th	Night	16% 7% 25% 37% 13% 1	998
	21st to end	Night	22% 10% 26% 31% 10% 1	1050
December	1st to 10th	Night	21% 9% 26% 34% 8% 1	1050
	11th to 20th	Night	24% 10% 25% 32% 7%	1050
	21st to end	Night	22% 9% 28% 34% 8%	1155

Page generated at 2026-09-26 03:18:42. Version ac07

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