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 2025-02-06.

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%	108346
	Night	11% 7% 2 5% 4 3 4 3 5% 6% 50%	110080
Transparency	Day	36% 6% 10% 24% 19% 4	111993
	Night	34% 5% 10% 25% 21% 5%	114573
Seeing	Day	15% 11% 23% 26% 18% 6%	15729
	Night	15% 10% 25% 32% 17% 2	25678

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 7% 4 3 3 3 4 4 45%	4077
	11th to 20th	Day	8% 8% 3 6% 4 4 4 3 4 5% 53%	4080
	21st to end	Day	19% 7% 3 5% 3 2 3 3 4 4 48%	4488
February	1st to 10th	Day	14% 10% 3 6% 4 3 3 3 4 5% 44%	1755
	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	5% 3 1 4 4 4 4 4 5% 8% 59%	4104
	11th to 20th	Day	11% 4 2 6% 5% 4 5% 4 6% 10% 42%	3829
	21st to end	Day	5% 3 2 5% 4 4 5% 4 6% 8% 53%	4180
September	1st to 10th	Day	12% 4 2 6% 4 4 5% 4 5% 7% 48%	2280
	11th to 20th	Day	14% 5% 2 5% 3 4 5% 4 6% 8% 44%	2261
	21st to end	Day	9% 5% 1 5% 4 4 4 3 5% 7% 52%	1990
October	1st to 10th	Day	8% 3 2 5% 4 3 4 3 5% 7% 56%	1900
	11th to 20th	Day	13% 5% 2 5% 3 2 3 2 3 4 58%	1900
	21st to end	Day	19% 5% 2 4 3 2 3 3 4 5% 51%	2090
November	1st to 10th	Day	12% 6% 2 4 3 3 3 2 4 6% 56%	1958
	11th to 20th	Day	9% 5% 2 5% 3 3 4 3 4 7% 53%	1894
	21st to end	Day	13% 8% 2 6% 3 3 4 3 5% 4 49%	1675
December	1st to 10th	Day	10% 7% 2 6% 4 3 3 2 4 5% 54%	2610
	11th to 20th	Day	11% 10% 3 6% 4 4 3 3 4 5% 47%	3008
	21st to end	Day	14% 15% 3 7% 4 4 4 4 5% 6% 34%	4237
January	1st to 10th	Night	14% 8% 3 8% 4 4 4 3 4 5% 43%	5888
	11th to 20th	Night	9% 7% 3 7% 4 3 3 2 3 5% 54%	5900
	21st to end	Night	17% 9% 4 6% 3 3 2 2 3 5% 46%	6490
February	1st to 10th	Night	14% 10% 2 6% 4 4 4 3 4 6% 42%	2536
	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	3 1 1 3 3 3 4 4 6% 9% 61%	2836
	11th to 20th	Night	5% 4 2 5% 4 4 4 4 6% 10% 52%	3002
	21st to end	Night	4 3 1 3 3 4 4 3 5% 8% 61%	3476
September	1st to 10th	Night	8% 4 2 5% 3 3 4 3 5% 6% 58%	1900
	11th to 20th	Night	11% 5% 2 5% 3 3 4 3 6% 6% 51%	1914
	21st to end	Night	7% 5% 2 5% 3 3 3 3 4 6% 59%	2171
October	1st to 10th	Night	7% 4 1 3 3 3 3 3 5% 7% 63%	2280
	11th to 20th	Night	11% 4 2 4 3 3 3 3 4 5% 60%	2280
	21st to end	Night	17% 5% 2 4 3 2 3 3 4 4 54%	2508
November	1st to 10th	Night	12% 4 2 4 3 3 3 3 4 5% 58%	2340
	11th to 20th	Night	10% 5% 2 4 3 3 3 2 5% 6% 57%	2504
	21st to end	Night	13% 7% 2 4 4 3 3 3 5% 6% 50%	2722
December	1st to 10th	Night	12% 8% 2 4 3 2 4 3 4 6% 54%	4580
	11th to 20th	Night	12% 10% 3 7% 4 4 4 3 4 4 46%	5199
	21st to end	Night	18% 12% 3 6% 4 4 4 3 4 5% 36%	6721

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	43% 3 9% 24% 18% 3	4078
	11th to 20th	Day	34% 4 7% 23% 27% 5%	4080
	21st to end	Day	41% 3 6% 18% 24% 9%	4488
February	1st to 10th	Day	45% 4 10% 22% 16% 4	1755
	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	23% 6% 17% 30% 19% 5%	4090
	11th to 20th	Day	39% 5% 14% 29% 12% 1	3867
	21st to end	Day	28% 6% 13% 34% 16% 3	4179
September	1st to 10th	Day	35% 6% 11% 23% 18% 7%	2280
	11th to 20th	Day	36% 7% 10% 21% 23% 4	2261
	21st to end	Day	30% 6% 9% 24% 26% 4	1990
October	1st to 10th	Day	16% 4 6% 16% 43% 16%	3160
	11th to 20th	Day	20% 2 4 21% 38% 15%	3140
	21st to end	Day	32% 3 6% 32% 23% 5%	3428
November	1st to 10th	Day	32% 4 8% 26% 23% 8%	1958
	11th to 20th	Day	32% 5% 7% 22% 25% 9%	1894
	21st to end	Day	38% 6% 8% 20% 24% 4	1675
December	1st to 10th	Day	36% 3 8% 29% 23% 3	2610
	11th to 20th	Day	41% 3 6% 25% 23% 2	3005
	21st to end	Day	50% 6% 8% 20% 12% 4	4237
January	1st to 10th	Night	44% 5% 10% 21% 16% 3	5888
	11th to 20th	Night	34% 5% 8% 20% 30% 4	5900
	21st to end	Night	42% 4 7% 18% 24% 5%	6490
February	1st to 10th	Night	44% 4 10% 22% 15% 4	2536
	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	18% 6% 18% 35% 22% 1	2826
	11th to 20th	Night	28% 6% 19% 30% 16% 1	3030
	21st to end	Night	22% 5% 14% 34% 22% 3	3476
September	1st to 10th	Night	26% 7% 9% 31% 19% 8%	1900
	11th to 20th	Night	32% 7% 11% 20% 25% 5%	1914
	21st to end	Night	26% 6% 10% 23% 30% 6%	2171
October	1st to 10th	Night	13% 3 8% 15% 39% 23%	3800
	11th to 20th	Night	18% 2 4 17% 38% 20%	3779
	21st to end	Night	28% 2 5% 28% 28% 8%	4120
November	1st to 10th	Night	30% 4 9% 24% 25% 7%	2340
	11th to 20th	Night	29% 4 8% 24% 27% 8%	2504
	21st to end	Night	35% 5% 9% 22% 25% 5%	2722
December	1st to 10th	Night	35% 3 8% 35% 17% 3	4580
	11th to 20th	Night	42% 3 6% 22% 22% 5%	5201
	21st to end	Night	50% 6% 8% 22% 10% 3	6721

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% 34% 18% 6%	300
	11th to 20th	Day	24% 24% 32% 17% 3	300
	21st to end	Day	23% 22% 33% 15% 6%	330
February	1st to 10th	Day	26% 17% 36% 17% 4 1	285
	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% 27% 34% 21%	539
September	1st to 10th	Day	11% 3 10% 26% 39% 11%	490
	11th to 20th	Day	13% 2 10% 33% 30% 13%	471
	21st to end	Day	13% 7% 21% 30% 22% 7%	300
October	1st to 10th	Day	10% 7% 21% 34% 21% 7%	300
	11th to 20th	Day	14% 14% 34% 24% 11% 3	300
	21st to end	Day	28% 14% 28% 22% 6% 2	330
November	1st to 10th	Day	19% 11% 34% 21% 12% 3	300
	11th to 20th	Day	18% 17% 33% 22% 9% 2	300
	21st to end	Day	24% 19% 28% 19% 7% 2	300
December	1st to 10th	Day	18% 25% 29% 19% 6% 3	300
	11th to 20th	Day	27% 19% 28% 18% 8% 1	300
	21st to end	Day	28% 20% 32% 15% 4	330
January	1st to 10th	Night	21% 18% 31% 27% 4 1	1000
	11th to 20th	Night	21% 18% 34% 22% 4	1000
	21st to end	Night	18% 15% 37% 26% 4	1100
February	1st to 10th	Night	23% 15% 31% 27% 4	976
	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% 1 6% 33% 45% 8%	627
September	1st to 10th	Night	9% 2 8% 33% 46% 4	570
	11th to 20th	Night	14% 2 7% 35% 36% 7%	570
	21st to end	Night	10% 4 14% 33% 35% 4	651
October	1st to 10th	Night	8% 3 18% 36% 31% 3	760
	11th to 20th	Night	13% 9% 27% 35% 16%	760
	21st to end	Night	20% 11% 25% 32% 11% 1	836
November	1st to 10th	Night	14% 8% 30% 34% 13% 1	780
	11th to 20th	Night	15% 11% 28% 36% 9% 1	800
	21st to end	Night	18% 14% 29% 30% 9%	922
December	1st to 10th	Night	21% 12% 30% 30% 7%	1000
	11th to 20th	Night	19% 15% 30% 31% 5%	1000
	21st to end	Night	21% 16% 30% 29% 4	1100

Page generated at 2025-02-03 02:05:55. Version ac07

Copyright © 2025 Attilla Danko.