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 2024-08-30.

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% 5% 4 4 4 6% 7% 45%	95234
	Night	11% 7% 2 5% 4 3 4 3 5% 7% 49%	93835
Transparency	Day	38% 7% 11% 23% 17% 4	95006
	Night	35% 6% 11% 24% 19% 4	93669
Seeing	Day	15% 11% 23% 26% 19% 6%	15229
	Night	15% 10% 25% 32% 17% 2	24993

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% 3 6% 3 3 3 3 4 5% 46%	2847
	11th to 20th	Day	10% 8% 3 6% 4 3 3 3 4 5% 50%	2850
	21st to end	Day	21% 8% 3 5% 3 2 2 2 3 4 45%	3135
February	1st to 10th	Day	15% 10% 3 6% 5% 3 3 3 4 4 44%	1710
	11th to 20th	Day	13% 9% 2 7% 5% 3 4 3 4 5% 43%	1744
	21st to end	Day	15% 11% 3 7% 4 4 3 3 5% 6% 39%	1622
March	1st to 10th	Day	16% 10% 2 7% 3 3 4 3 4 4 44%	3436
	11th to 20th	Day	13% 6% 2 5% 4 3 4 3 4 7% 51%	3480
	21st to end	Day	15% 8% 3 7% 5% 4 4 3 4 5% 42%	3814
April	1st to 10th	Day	9% 7% 3 8% 5% 4 5% 3 5% 6% 45%	2270
	11th to 20th	Day	14% 8% 3 6% 4 4 4 5% 6% 6% 41%	2254
	21st to end	Day	16% 8% 2 6% 5% 4 4 4 5% 5% 40%	2280
May	1st to 10th	Day	13% 6% 2 6% 5% 5% 5% 4 7% 7% 38%	3855
	11th to 20th	Day	12% 7% 2 7% 6% 4 4 4 6% 8% 41%	4082
	21st to end	Day	13% 7% 2 7% 7% 5% 5% 4 5% 7% 37%	4562
June	1st to 10th	Day	8% 4 2 6% 5% 5% 6% 5% 7% 9% 43%	2660
	11th to 20th	Day	4 4 2 5% 6% 5% 5% 6% 8% 10% 46%	2660
	21st to end	Day	4 3 1 5% 5% 5% 5% 5% 7% 9% 50%	2606
July	1st to 10th	Day	9% 5% 2 6% 5% 5% 5% 4 6% 9% 43%	4120
	11th to 20th	Day	5% 3 1 4 4 4 5% 5% 7% 9% 52%	4120
	21st to end	Day	8% 6% 2 8% 6% 6% 6% 5% 8% 9% 35%	4465
August	1st to 10th	Day	7% 4 2 6% 5% 5% 5% 6% 7% 10% 42%	2458
	11th to 20th	Day	10% 4 2 6% 5% 5% 5% 4 6% 9% 42%	2309
	21st to end	Day	6% 4 2 5% 5% 4 6% 4 7% 9% 48%	2485
September	1st to 10th	Day	12% 4 2 5% 4 4 5% 4 5% 7% 48%	2160
	11th to 20th	Day	13% 5% 2 5% 4 4 5% 4 6% 8% 45%	2142
	21st to end	Day	9% 5% 1 4 4 4 4 3 5% 7% 53%	1886
October	1st to 10th	Day	8% 3 2 5% 4 3 5% 4 6% 7% 54%	1800
	11th to 20th	Day	14% 5% 2 5% 3 3 3 2 3 4 56%	1800
	21st to end	Day	19% 6% 2 4 3 2 3 3 4 5% 51%	1980
November	1st to 10th	Day	10% 6% 2 4 3 3 3 2 4 6% 57%	1858
	11th to 20th	Day	10% 5% 2 5% 3 4 4 3 4 7% 53%	1800
	21st to end	Day	13% 8% 2 6% 4 3 4 4 5% 4 48%	1592
December	1st to 10th	Day	13% 7% 3 5% 4 3 4 3 4 7% 48%	1520
	11th to 20th	Day	10% 10% 3 6% 5% 4 4 3 5% 4 46%	1918
	21st to end	Day	9% 14% 4 8% 5% 4 5% 4 6% 6% 35%	2954
January	1st to 10th	Night	12% 8% 3 8% 5% 4 4 4 4 5% 43%	4108
	11th to 20th	Night	10% 8% 2 7% 4 3 4 2 3 5% 51%	4120
	21st to end	Night	20% 11% 3 5% 3 2 3 2 3 4 43%	4532
February	1st to 10th	Night	15% 10% 3 6% 4 4 4 3 4 6% 41%	2470
	11th to 20th	Night	14% 8% 3 6% 4 3 4 3 4 6% 46%	2320
	21st to end	Night	14% 8% 2 5% 4 3 3 4 5% 5% 47%	1846
March	1st to 10th	Night	20% 8% 3 5% 3 3 3 2 4 5% 43%	3419
	11th to 20th	Night	13% 7% 3 5% 3 3 3 2 4 6% 51%	3480
	21st to end	Night	12% 7% 3 7% 5% 4 4 4 5% 7% 43%	3817
April	1st to 10th	Night	9% 6% 2 5% 4 4 5% 4 5% 7% 50%	1910
	11th to 20th	Night	12% 7% 2 5% 4 4 3 3 5% 6% 49%	1875
	21st to end	Night	15% 7% 2 6% 3 4 3 4 6% 6% 44%	1900
May	1st to 10th	Night	13% 6% 2 5% 3 4 5% 4 6% 8% 44%	3039
	11th to 20th	Night	12% 6% 2 6% 4 3 5% 4 6% 8% 44%	2823
	21st to end	Night	11% 6% 3 6% 5% 4 5% 4 6% 9% 43%	3000
June	1st to 10th	Night	7% 3 2 5% 3 3 4 3 7% 10% 53%	1520
	11th to 20th	Night	3 4 2 3 3 3 3 4 5% 12% 59%	1520
	21st to end	Night	3 3 1 3 4 3 4 4 7% 9% 61%	1566
July	1st to 10th	Night	7% 4 1 5% 4 4 4 4 7% 9% 50%	2850
	11th to 20th	Night	5% 3 1 3 3 3 3 3 5% 8% 64%	2850
	21st to end	Night	7% 6% 2 7% 5% 4 5% 4 7% 8% 44%	3098
August	1st to 10th	Night	5% 2 1 5% 4 4 5% 5% 8% 12% 49%	1701
	11th to 20th	Night	5% 4 2 5% 4 3 4 5% 7% 10% 50%	1811
	21st to end	Night	6% 3 1 4 4 4 4 4 7% 9% 55%	2080
September	1st to 10th	Night	8% 4 2 5% 3 3 3 4 5% 6% 57%	1800
	11th to 20th	Night	10% 5% 2 5% 3 3 4 3 6% 6% 51%	1813
	21st to end	Night	6% 5% 2 5% 3 3 3 3 4 6% 61%	2056
October	1st to 10th	Night	7% 4 2 3 3 3 3 3 5% 7% 61%	2160
	11th to 20th	Night	12% 4 2 4 3 3 3 3 4 5% 58%	2160
	21st to end	Night	18% 5% 2 4 3 2 2 3 4 4 53%	2376
November	1st to 10th	Night	11% 3 2 4 3 3 3 3 4 5% 59%	2220
	11th to 20th	Night	10% 5% 2 4 3 3 3 2 5% 6% 56%	2378
	21st to end	Night	13% 6% 2 4 4 3 3 3 5% 6% 49%	2585
December	1st to 10th	Night	14% 8% 2 5% 3 3 4 2 4 6% 48%	2660
	11th to 20th	Night	12% 9% 3 7% 5% 4 4 3 4 5% 45%	3279
	21st to end	Night	12% 13% 4 7% 5% 5% 5% 4 5% 6% 36%	4693

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	41% 5% 6% 25% 20% 3	2848
	11th to 20th	Day	35% 6% 9% 24% 21% 4	2850
	21st to end	Day	43% 4 8% 19% 20% 6%	3135
February	1st to 10th	Day	45% 4 10% 21% 15% 4	1710
	11th to 20th	Day	44% 5% 9% 21% 18% 4	1753
	21st to end	Day	46% 5% 9% 17% 15% 9%	1622
March	1st to 10th	Day	44% 6% 7% 16% 16% 11%	3436
	11th to 20th	Day	34% 6% 9% 25% 19% 6%	3480
	21st to end	Day	44% 6% 9% 22% 18% 1	3814
April	1st to 10th	Day	39% 6% 10% 22% 20% 3	2270
	11th to 20th	Day	40% 7% 11% 20% 17% 5%	2254
	21st to end	Day	46% 7% 8% 21% 15% 3	2280
May	1st to 10th	Day	43% 10% 12% 20% 14% 1	3890
	11th to 20th	Day	39% 10% 12% 25% 13% 1	4086
	21st to end	Day	44% 10% 12% 20% 13% 2	4575
June	1st to 10th	Day	35% 10% 14% 25% 15% 1	2660
	11th to 20th	Day	30% 9% 16% 27% 16% 2	2660
	21st to end	Day	27% 8% 16% 27% 17% 4	2606
July	1st to 10th	Day	37% 6% 15% 27% 12% 2	4056
	11th to 20th	Day	27% 6% 10% 34% 21% 2	4051
	21st to end	Day	43% 6% 17% 26% 8% 1	4325
August	1st to 10th	Day	33% 10% 18% 26% 12% 1	2444
	11th to 20th	Day	37% 8% 13% 26% 15% 1	2309
	21st to end	Day	31% 9% 15% 25% 15% 5%	2485
September	1st to 10th	Day	35% 7% 11% 24% 17% 6%	2160
	11th to 20th	Day	35% 7% 10% 20% 23% 4	2142
	21st to end	Day	29% 6% 9% 24% 27% 4	1886
October	1st to 10th	Day	28% 7% 10% 24% 24% 6%	1800
	11th to 20th	Day	33% 3 6% 23% 26% 8%	1800
	21st to end	Day	38% 4 8% 25% 17% 8%	1980
November	1st to 10th	Day	30% 4 8% 26% 24% 8%	1858
	11th to 20th	Day	32% 6% 7% 23% 25% 8%	1800
	21st to end	Day	38% 6% 8% 18% 25% 4	1592
December	1st to 10th	Day	38% 5% 11% 26% 17% 4	1520
	11th to 20th	Day	42% 4 6% 19% 26% 3	1915
	21st to end	Day	46% 9% 10% 16% 14% 5%	2954
January	1st to 10th	Night	41% 7% 6% 21% 21% 2	4108
	11th to 20th	Night	35% 7% 11% 23% 21% 3	4120
	21st to end	Night	45% 6% 9% 19% 19% 3	4532
February	1st to 10th	Night	44% 4 10% 21% 16% 4	2470
	11th to 20th	Night	40% 5% 10% 22% 18% 5%	2321
	21st to end	Night	40% 5% 9% 20% 18% 8%	1846
March	1st to 10th	Night	45% 6% 8% 15% 16% 10%	3419
	11th to 20th	Night	36% 5% 8% 28% 19% 4	3480
	21st to end	Night	40% 7% 10% 26% 15% 1	3817
April	1st to 10th	Night	34% 6% 12% 21% 21% 6%	1910
	11th to 20th	Night	36% 5% 9% 24% 20% 6%	1875
	21st to end	Night	39% 7% 11% 26% 15% 2	1900
May	1st to 10th	Night	37% 10% 13% 23% 14% 2	3069
	11th to 20th	Night	36% 10% 16% 24% 13% 2	2824
	21st to end	Night	37% 10% 14% 25% 13% 1	3008
June	1st to 10th	Night	26% 8% 13% 32% 18% 3	1520
	11th to 20th	Night	20% 5% 15% 36% 20% 3	1520
	21st to end	Night	19% 7% 17% 29% 22% 7%	1566
July	1st to 10th	Night	30% 7% 18% 26% 17% 2	2805
	11th to 20th	Night	20% 5% 10% 38% 24% 3	2796
	21st to end	Night	36% 6% 17% 29% 11%	2999
August	1st to 10th	Night	24% 10% 20% 32% 13% 1	1691
	11th to 20th	Night	28% 9% 18% 24% 20% 2	1811
	21st to end	Night	25% 8% 16% 29% 18% 5%	2080
September	1st to 10th	Night	27% 7% 10% 31% 18% 8%	1800
	11th to 20th	Night	31% 7% 11% 20% 25% 5%	1813
	21st to end	Night	24% 6% 9% 24% 30% 6%	2056
October	1st to 10th	Night	23% 5% 14% 26% 24% 8%	2160
	11th to 20th	Night	30% 4 7% 21% 30% 8%	2160
	21st to end	Night	36% 4 7% 21% 23% 9%	2376
November	1st to 10th	Night	28% 5% 9% 25% 26% 8%	2220
	11th to 20th	Night	30% 4 8% 25% 27% 7%	2378
	21st to end	Night	35% 5% 9% 20% 25% 5%	2585
December	1st to 10th	Night	38% 5% 11% 22% 20% 5%	2660
	11th to 20th	Night	41% 5% 8% 21% 21% 4	3281
	21st to end	Night	46% 9% 10% 19% 13% 3	4693

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	24% 18% 33% 19% 7%	270
	11th to 20th	Day	26% 24% 31% 16% 3	270
	21st to end	Day	24% 22% 32% 15% 7%	297
February	1st to 10th	Day	27% 17% 34% 17% 3 1	270
	11th to 20th	Day	26% 26% 26% 17% 4	270
	21st to end	Day	35% 24% 28% 12% 2	225
March	1st to 10th	Day	24% 21% 30% 18% 7%	270
	11th to 20th	Day	30% 22% 30% 16% 2	270
	21st to end	Day	27% 28% 31% 10% 4	297
April	1st to 10th	Day	20% 19% 35% 17% 9% 1	450
	11th to 20th	Day	22% 19% 32% 18% 7% 1	452
	21st to end	Day	25% 16% 32% 21% 5% 2	460
May	1st to 10th	Day	18% 16% 32% 25% 8% 1	514
	11th to 20th	Day	15% 11% 29% 26% 16% 3	675
	21st to end	Day	11% 8% 33% 26% 17% 5%	734
June	1st to 10th	Day	10% 5% 18% 32% 26% 9%	680
	11th to 20th	Day	5% 2 20% 39% 26% 8%	680
	21st to end	Day	5% 3 24% 37% 25% 8%	680
July	1st to 10th	Day	7% 3 13% 33% 31% 12%	671
	11th to 20th	Day	6% 2 15% 32% 31% 14%	668
	21st to end	Day	8% 2 9% 32% 32% 17%	739
August	1st to 10th	Day	8% 1 11% 37% 35% 8%	676
	11th to 20th	Day	13% 3 10% 31% 33% 10%	543
	21st to end	Day	9% 2 7% 28% 35% 20%	532
September	1st to 10th	Day	11% 3 10% 25% 40% 11%	450
	11th to 20th	Day	11% 2 9% 34% 31% 14%	432
	21st to end	Day	13% 6% 21% 30% 24% 7%	270
October	1st to 10th	Day	11% 7% 23% 33% 20% 6%	270
	11th to 20th	Day	15% 15% 36% 23% 10% 1	270
	21st to end	Day	31% 13% 28% 21% 6% 2	297
November	1st to 10th	Day	15% 12% 35% 22% 13% 4	270
	11th to 20th	Day	17% 18% 32% 22% 10% 1	270
	21st to end	Day	25% 19% 27% 19% 8% 2	270
December	1st to 10th	Day	18% 25% 28% 20% 6% 3	270
	11th to 20th	Day	27% 17% 29% 19% 9%	270
	21st to end	Day	26% 22% 33% 15% 4	297
January	1st to 10th	Night	20% 18% 31% 26% 4 1	950
	11th to 20th	Night	21% 19% 33% 22% 4	950
	21st to end	Night	19% 16% 36% 26% 4	1045
February	1st to 10th	Night	23% 15% 31% 27% 4	950
	11th to 20th	Night	20% 18% 38% 21% 3	846
	21st to end	Night	23% 18% 34% 24% 1	590
March	1st to 10th	Night	20% 15% 31% 31% 4	570
	11th to 20th	Night	22% 13% 29% 32% 3	570
	21st to end	Night	20% 13% 33% 27% 7%	627
April	1st to 10th	Night	14% 18% 34% 29% 5%	570
	11th to 20th	Night	15% 17% 29% 31% 8%	563
	21st to end	Night	17% 11% 37% 25% 9% 1	570
May	1st to 10th	Night	12% 9% 29% 40% 10% 1	570
	11th to 20th	Night	15% 6% 25% 32% 21% 1	561
	21st to end	Night	9% 6% 23% 34% 23% 5%	617
June	1st to 10th	Night	8% 5% 12% 38% 35% 2	570
	11th to 20th	Night	5% 2 16% 44% 31% 3	570
	21st to end	Night	4 1 15% 43% 32% 5%	570
July	1st to 10th	Night	4 1 10% 34% 44% 7%	555
	11th to 20th	Night	4 1 8% 37% 43% 8%	552
	21st to end	Night	6% 1 5% 39% 41% 8%	624
August	1st to 10th	Night	5% 1 7% 39% 43% 5%	567
	11th to 20th	Night	7% 2 9% 35% 41% 5%	564
	21st to end	Night	7% 2 6% 32% 45% 8%	624
September	1st to 10th	Night	9% 2 8% 33% 46% 3	540
	11th to 20th	Night	13% 1 8% 34% 37% 7%	540
	21st to end	Night	9% 4 14% 33% 36% 4	616
October	1st to 10th	Night	8% 4 19% 36% 30% 3	720
	11th to 20th	Night	13% 10% 28% 35% 14%	720
	21st to end	Night	21% 11% 25% 31% 11% 1	792
November	1st to 10th	Night	13% 8% 31% 34% 14% 1	740
	11th to 20th	Night	15% 11% 28% 36% 9% 1	760
	21st to end	Night	19% 13% 29% 30% 9%	875
December	1st to 10th	Night	21% 13% 30% 29% 7%	950
	11th to 20th	Night	19% 15% 30% 31% 5%	950
	21st to end	Night	20% 17% 31% 28% 4	1045

Page generated at 2024-08-27 08:49:44. Version ac07

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