Tyler Bend Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Tyler Bend Campground clear sky chart from 2005-11-06 to 2026-06-01.

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	11% 7% 2 6% 4 4 4 4 5% 7% 46%	131676
	Night	11% 7% 2 5% 4 3 4 3 5% 6% 50%	131729
Transparency	Day	37% 5% 10% 24% 19% 5%	135284
	Night	35% 5% 10% 25% 20% 5%	136198
Seeing	Day	16% 11% 24% 26% 18% 6%	17524
	Night	15% 10% 25% 32% 17% 2	27384

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	14% 9% 3 7% 4 4 4 3 4 5% 45%	5289
	11th to 20th	Day	7% 8% 3 6% 4 3 3 3 4 4 56%	5310
	21st to end	Day	17% 7% 3 6% 3 3 3 3 3 4 49%	5812
February	1st to 10th	Day	14% 10% 3 7% 4 3 3 3 4 4 44%	1890
	11th to 20th	Day	14% 9% 2 7% 5% 3 4 3 5% 5% 43%	1934
	21st to end	Day	14% 10% 3 6% 4 4 4 3 5% 6% 42%	1788
March	1st to 10th	Day	14% 11% 2 6% 4 3 4 3 5% 5% 44%	5046
	11th to 20th	Day	10% 5% 2 4 3 3 4 3 5% 6% 55%	5090
	21st to end	Day	12% 8% 3 7% 5% 4 4 3 5% 6% 42%	5583
April	1st to 10th	Day	10% 7% 3 8% 5% 4 4 3 6% 6% 45%	2509
	11th to 20th	Day	13% 8% 2 6% 4 4 4 4 6% 6% 42%	2494
	21st to end	Day	16% 8% 3 6% 5% 5% 5% 4 5% 6% 38%	2520
May	1st to 10th	Day	14% 7% 3 7% 5% 5% 5% 4 7% 7% 37%	5660
	11th to 20th	Day	12% 7% 2 7% 5% 4 5% 4 5% 7% 41%	5992
	21st to end	Day	18% 7% 2 7% 6% 5% 5% 4 5% 7% 35%	6706
June	1st to 10th	Day	8% 4 2 6% 5% 5% 5% 5% 7% 9% 43%	2801
	11th to 20th	Day	4 4 2 5% 6% 6% 5% 6% 7% 9% 45%	2800
	21st to end	Day	4 3 1 5% 5% 5% 5% 5% 7% 10% 50%	2743
July	1st to 10th	Day	8% 5% 3 6% 5% 6% 5% 5% 7% 10% 41%	5900
	11th to 20th	Day	5% 4 2 5% 4 4 5% 5% 7% 10% 51%	5900
	21st to end	Day	6% 4 2 7% 5% 6% 6% 5% 8% 10% 41%	6422
August	1st to 10th	Day	5% 3 1 4 3 4 4 4 5% 8% 59%	4234
	11th to 20th	Day	11% 4 2 6% 5% 4 5% 4 6% 10% 42%	3952
	21st to end	Day	5% 3 2 5% 4 4 5% 4 6% 8% 53%	4312
September	1st to 10th	Day	12% 4 2 6% 4 4 5% 4 5% 7% 48%	2400
	11th to 20th	Day	13% 5% 2 5% 4 4 5% 4 6% 8% 44%	2380
	21st to end	Day	9% 5% 1 5% 4 4 5% 3 5% 7% 52%	2095
October	1st to 10th	Day	7% 3 2 4 4 3 5% 3 5% 7% 57%	2000
	11th to 20th	Day	13% 4 2 4 3 3 3 2 3 5% 58%	2000
	21st to end	Day	20% 6% 2 4 3 2 2 2 4 5% 51%	2200
November	1st to 10th	Day	11% 6% 2 4 3 3 3 2 4 6% 57%	2058
	11th to 20th	Day	9% 6% 2 5% 3 4 4 3 4 6% 53%	1988
	21st to end	Day	13% 8% 2 6% 3 3 4 4 5% 4 49%	1759
December	1st to 10th	Day	11% 7% 3 6% 4 3 3 2 3 4 54%	2690
	11th to 20th	Day	10% 9% 3 6% 4 4 3 3 4 5% 48%	3088
	21st to end	Day	13% 15% 3 7% 4 4 4 4 5% 6% 35%	4331
January	1st to 10th	Night	13% 8% 3 8% 4 4 4 3 4 5% 45%	7634
	11th to 20th	Night	8% 7% 2 6% 3 2 3 2 3 4 59%	7680
	21st to end	Night	17% 9% 4 6% 4 3 3 3 4 5% 43%	8402
February	1st to 10th	Night	14% 10% 2 6% 4 4 4 3 4 6% 42%	2730
	11th to 20th	Night	15% 8% 3 6% 3 3 4 3 5% 6% 44%	2570
	21st to end	Night	13% 7% 2 5% 4 3 3 4 5% 4 49%	2034
March	1st to 10th	Night	18% 8% 3 6% 4 4 4 3 4 4 44%	5029
	11th to 20th	Night	10% 8% 2 5% 3 3 3 3 4 6% 52%	5090
	21st to end	Night	10% 7% 3 6% 4 4 4 4 5% 8% 45%	5588
April	1st to 10th	Night	10% 5% 2 5% 4 3 4 4 6% 7% 50%	2111
	11th to 20th	Night	13% 7% 2 5% 4 4 3 3 5% 6% 49%	2075
	21st to end	Night	15% 7% 2 6% 4 4 3 4 5% 6% 44%	2100
May	1st to 10th	Night	15% 7% 2 6% 4 4 5% 4 6% 8% 42%	4457
	11th to 20th	Night	13% 7% 3 7% 4 4 5% 4 6% 8% 40%	4143
	21st to end	Night	19% 7% 3 6% 4 4 4 3 5% 7% 38%	4407
June	1st to 10th	Night	7% 3 2 6% 3 3 4 3 7% 10% 52%	1600
	11th to 20th	Night	4 4 1 4 3 3 4 4 5% 12% 58%	1600
	21st to end	Night	3 3 1 3 4 3 4 4 6% 9% 61%	1649
July	1st to 10th	Night	6% 4 1 6% 5% 5% 5% 4 8% 9% 46%	4078
	11th to 20th	Night	4 3 1 4 3 3 4 3 5% 8% 62%	4077
	21st to end	Night	5% 4 2 5% 4 3 4 4 7% 9% 52%	4449
August	1st to 10th	Night	4 2 1 3 3 3 4 4 6% 9% 61%	2926
	11th to 20th	Night	5% 4 2 5% 4 4 4 4 6% 10% 52%	3099
	21st to end	Night	4 3 1 4 3 4 4 3 6% 8% 60%	3586
September	1st to 10th	Night	8% 4 2 5% 3 3 4 4 5% 6% 57%	2000
	11th to 20th	Night	10% 5% 2 5% 3 4 5% 3 6% 7% 51%	2015
	21st to end	Night	7% 5% 2 5% 3 3 3 3 4 6% 59%	2285
October	1st to 10th	Night	7% 4 1 3 2 3 3 3 5% 6% 63%	2400
	11th to 20th	Night	11% 4 2 4 3 3 3 3 4 5% 60%	2400
	21st to end	Night	18% 5% 2 4 4 2 2 3 3 4 53%	2640
November	1st to 10th	Night	12% 4 2 4 3 3 3 3 4 5% 59%	2460
	11th to 20th	Night	10% 5% 2 4 2 3 3 2 5% 6% 58%	2629
	21st to end	Night	13% 7% 2 5% 4 3 3 3 5% 6% 50%	2858
December	1st to 10th	Night	12% 8% 2 4 3 2 3 3 4 6% 53%	4720
	11th to 20th	Night	11% 10% 3 7% 4 4 4 3 4 4 47%	5339
	21st to end	Night	18% 12% 3 6% 4 4 4 3 4 5% 37%	6869

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	44% 2 8% 26% 17% 2	5290
	11th to 20th	Day	33% 3 5% 22% 31% 5%	5310
	21st to end	Day	41% 2 5% 20% 24% 8%	5812
February	1st to 10th	Day	45% 4 10% 22% 15% 4	1890
	11th to 20th	Day	44% 4 9% 21% 18% 4	1943
	21st to end	Day	43% 4 8% 17% 18% 9%	1788
March	1st to 10th	Day	44% 4 6% 19% 13% 14%	5046
	11th to 20th	Day	31% 4 6% 21% 24% 13%	5090
	21st to end	Day	42% 4 8% 28% 17% 1	5585
April	1st to 10th	Day	39% 5% 11% 21% 20% 3	2509
	11th to 20th	Day	41% 6% 11% 20% 16% 6%	2494
	21st to end	Day	47% 6% 9% 21% 14% 2	2520
May	1st to 10th	Day	46% 7% 11% 21% 15% 1	5695
	11th to 20th	Day	43% 7% 11% 24% 14% 2	5996
	21st to end	Day	49% 7% 10% 17% 16% 2	6720
June	1st to 10th	Day	35% 10% 14% 24% 16% 1	2801
	11th to 20th	Day	32% 9% 15% 26% 16% 3	2800
	21st to end	Day	27% 8% 16% 28% 18% 4	2743
July	1st to 10th	Day	38% 5% 14% 27% 14% 3	5836
	11th to 20th	Day	29% 5% 14% 33% 17% 2	5831
	21st to end	Day	37% 5% 15% 29% 13% 1	6240
August	1st to 10th	Day	23% 6% 16% 31% 19% 5%	4220
	11th to 20th	Day	38% 5% 14% 30% 12% 1	3990
	21st to end	Day	29% 6% 13% 34% 16% 3	4311
September	1st to 10th	Day	35% 6% 10% 24% 18% 7%	2400
	11th to 20th	Day	37% 7% 10% 21% 22% 4	2380
	21st to end	Day	31% 6% 9% 23% 27% 4	2095
October	1st to 10th	Day	16% 4 5% 17% 42% 15%	3260
	11th to 20th	Day	20% 2 4 22% 38% 14%	3240
	21st to end	Day	33% 2 6% 32% 22% 5%	3538
November	1st to 10th	Day	31% 4 8% 26% 24% 8%	2058
	11th to 20th	Day	32% 5% 7% 24% 24% 8%	1988
	21st to end	Day	38% 6% 8% 21% 23% 4	1759
December	1st to 10th	Day	36% 3 8% 29% 23% 2	2690
	11th to 20th	Day	40% 3 6% 26% 23% 2	3085
	21st to end	Day	50% 6% 8% 21% 12% 3	4331
January	1st to 10th	Night	43% 4 9% 28% 14% 3	7635
	11th to 20th	Night	31% 4 6% 18% 35% 6%	7680
	21st to end	Night	46% 3 7% 18% 22% 5%	8402
February	1st to 10th	Night	44% 4 10% 23% 16% 3	2730
	11th to 20th	Night	42% 4 10% 21% 18% 5%	2571
	21st to end	Night	38% 4 8% 20% 20% 9%	2034
March	1st to 10th	Night	46% 4 6% 15% 17% 12%	5029
	11th to 20th	Night	35% 4 6% 25% 19% 12%	5090
	21st to end	Night	37% 5% 11% 29% 17% 2	5588
April	1st to 10th	Night	35% 5% 12% 22% 20% 6%	2111
	11th to 20th	Night	37% 5% 9% 24% 19% 7%	2075
	21st to end	Night	40% 6% 11% 25% 15% 3	2100
May	1st to 10th	Night	42% 7% 13% 24% 12% 2	4487
	11th to 20th	Night	42% 8% 13% 23% 11% 3	4144
	21st to end	Night	46% 7% 12% 20% 12% 3	4415
June	1st to 10th	Night	26% 8% 13% 31% 18% 3	1600
	11th to 20th	Night	22% 5% 15% 35% 20% 3	1600
	21st to end	Night	18% 7% 18% 29% 22% 6%	1649
July	1st to 10th	Night	34% 5% 15% 25% 19% 2	4035
	11th to 20th	Night	21% 5% 16% 38% 17% 2	4026
	21st to end	Night	29% 5% 18% 32% 15%	4320
August	1st to 10th	Night	19% 6% 17% 35% 22% 1	2916
	11th to 20th	Night	28% 6% 20% 30% 15% 1	3127
	21st to end	Night	23% 5% 13% 34% 22% 3	3586
September	1st to 10th	Night	27% 6% 9% 31% 18% 8%	2000
	11th to 20th	Night	32% 7% 12% 21% 24% 4	2015
	21st to end	Night	27% 5% 9% 23% 30% 6%	2285
October	1st to 10th	Night	14% 3 8% 15% 39% 22%	3920
	11th to 20th	Night	18% 2 5% 18% 38% 19%	3899
	21st to end	Night	29% 2 5% 28% 28% 7%	4252
November	1st to 10th	Night	29% 4 9% 24% 26% 7%	2460
	11th to 20th	Night	29% 3 8% 26% 26% 8%	2629
	21st to end	Night	36% 5% 9% 22% 24% 5%	2858
December	1st to 10th	Night	35% 3 9% 35% 16% 3	4720
	11th to 20th	Night	42% 3 6% 22% 22% 5%	5341
	21st to end	Night	49% 6% 8% 23% 10% 3	6869

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	25% 17% 35% 17% 8%	330
	11th to 20th	Day	23% 24% 33% 17% 2	330
	21st to end	Day	23% 22% 34% 15% 6%	363
February	1st to 10th	Day	27% 18% 34% 17% 4 1	330
	11th to 20th	Day	28% 25% 27% 15% 4	330
	21st to end	Day	32% 23% 28% 13% 3	273
March	1st to 10th	Day	26% 20% 30% 16% 6%	330
	11th to 20th	Day	30% 22% 30% 16% 2	330
	21st to end	Day	25% 26% 34% 11% 4	363
April	1st to 10th	Day	22% 18% 34% 18% 9% 1	529
	11th to 20th	Day	23% 19% 34% 16% 7% 1	532
	21st to end	Day	24% 15% 32% 22% 5% 2	540
May	1st to 10th	Day	17% 16% 32% 26% 8% 1	600
	11th to 20th	Day	17% 12% 30% 24% 14% 3	775
	21st to end	Day	14% 9% 30% 27% 16% 5%	844
June	1st to 10th	Day	10% 6% 19% 32% 25% 9%	731
	11th to 20th	Day	5% 2 21% 38% 26% 8%	730
	21st to end	Day	4 2 22% 38% 25% 8%	730
July	1st to 10th	Day	7% 3 13% 33% 31% 12%	721
	11th to 20th	Day	6% 2 15% 32% 31% 14%	718
	21st to end	Day	7% 2 8% 32% 32% 18%	794
August	1st to 10th	Day	8% 1 11% 37% 34% 8%	726
	11th to 20th	Day	12% 3 9% 30% 33% 13%	586
	21st to end	Day	9% 2 8% 28% 33% 20%	583
September	1st to 10th	Day	11% 3 10% 27% 38% 10%	530
	11th to 20th	Day	13% 2 9% 33% 30% 14%	510
	21st to end	Day	13% 6% 22% 29% 22% 8%	330
October	1st to 10th	Day	10% 6% 21% 36% 20% 7%	330
	11th to 20th	Day	13% 14% 33% 24% 12% 3	330
	21st to end	Day	31% 13% 27% 21% 6% 1	363
November	1st to 10th	Day	18% 12% 33% 22% 12% 3	330
	11th to 20th	Day	18% 16% 34% 20% 10% 2	330
	21st to end	Day	25% 19% 28% 18% 8% 2	330
December	1st to 10th	Day	19% 24% 29% 19% 7% 3	330
	11th to 20th	Day	26% 18% 29% 19% 8% 1	330
	21st to end	Day	27% 20% 34% 15% 5%	363
January	1st to 10th	Night	20% 18% 31% 27% 4 1	1050
	11th to 20th	Night	21% 18% 35% 22% 4	1050
	21st to end	Night	18% 16% 36% 26% 3	1155
February	1st to 10th	Night	22% 14% 32% 27% 4	1050
	11th to 20th	Night	22% 18% 37% 21% 3	936
	21st to end	Night	22% 18% 33% 27% 1	650
March	1st to 10th	Night	20% 15% 32% 30% 3	630
	11th to 20th	Night	23% 14% 29% 31% 3	630
	21st to end	Night	19% 13% 35% 27% 6%	693
April	1st to 10th	Night	15% 17% 33% 30% 5%	630
	11th to 20th	Night	16% 17% 29% 30% 8%	623
	21st to end	Night	18% 11% 36% 26% 9%	630
May	1st to 10th	Night	12% 9% 29% 40% 10%	630
	11th to 20th	Night	16% 6% 26% 31% 20% 1	621
	21st to end	Night	11% 7% 22% 33% 23% 4	683
June	1st to 10th	Night	8% 5% 13% 39% 34% 2	600
	11th to 20th	Night	5% 2 16% 44% 31% 3	600
	21st to end	Night	4 1 14% 42% 34% 5%	600
July	1st to 10th	Night	4 1 9% 33% 45% 7%	585
	11th to 20th	Night	4 1 8% 36% 44% 8%	582
	21st to end	Night	6% 1 5% 37% 42% 9%	657
August	1st to 10th	Night	5% 1 7% 39% 42% 5%	597
	11th to 20th	Night	7% 2 9% 35% 43% 5%	594
	21st to end	Night	8% 2 6% 33% 44% 8%	660
September	1st to 10th	Night	9% 2 8% 34% 45% 3	600
	11th to 20th	Night	13% 2 7% 34% 37% 7%	600
	21st to end	Night	10% 4 14% 34% 34% 4	685
October	1st to 10th	Night	8% 3 18% 36% 32% 3	800
	11th to 20th	Night	12% 9% 26% 36% 17%	800
	21st to end	Night	21% 11% 25% 32% 10% 1	880
November	1st to 10th	Night	14% 9% 30% 34% 13% 1	820
	11th to 20th	Night	15% 11% 29% 36% 9%	840
	21st to end	Night	19% 14% 29% 30% 9%	968
December	1st to 10th	Night	21% 12% 30% 31% 7%	1050
	11th to 20th	Night	19% 14% 30% 32% 5%	1050
	21st to end	Night	21% 16% 30% 29% 5%	1155

Page generated at 2026-05-29 00:53:28. Version ac07

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