Great Bend
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Great Bend clear sky chart from 2005-11-06 to 2025-03-12.

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	8% 5% 2 5% 3 3 4 3 5% 7% 54%	113349
	Night	7% 5% 2 5% 3 3 3 3 5% 7% 57%	114444
Transparency	Day	29% 5% 11% 27% 22% 5%	113116
	Night	28% 4 11% 26% 24% 6%	114267
Seeing	Day	10% 8% 31% 32% 16% 3	15981
	Night	10% 8% 35% 36% 10% 1	26068

By Month

Percentage Cloud Cover SW (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	10% 7% 2 7% 4 4 4 3 5% 7% 46%	4077
	11th to 20th	Day	5% 7% 3 9% 5% 4 4 3 5% 6% 48%	4080
	21st to end	Day	6% 8% 3 7% 3 3 4 3 4 5% 53%	4488
February	1st to 10th	Day	7% 10% 3 8% 5% 4 3 3 5% 6% 47%	1885
	11th to 20th	Day	5% 6% 2 6% 5% 5% 4 4 5% 7% 51%	1949
	21st to end	Day	7% 5% 1 5% 3 3 3 2 6% 8% 56%	1650
March	1st to 10th	Day	9% 6% 2 3 2 2 3 3 4 6% 60%	3321
	11th to 20th	Day	8% 6% 2 4 3 3 3 2 4 6% 58%	3491
	21st to end	Day	10% 8% 2 5% 4 4 4 3 5% 8% 48%	3814
April	1st to 10th	Day	9% 5% 2 5% 3 3 3 3 5% 6% 55%	2156
	11th to 20th	Day	10% 7% 2 7% 4 4 4 4 5% 6% 47%	2325
	21st to end	Day	14% 6% 2 6% 4 4 4 4 5% 6% 45%	2470
May	1st to 10th	Day	13% 7% 2 7% 3 4 4 4 5% 6% 43%	4120
	11th to 20th	Day	10% 6% 2 6% 4 4 4 4 6% 7% 48%	4082
	21st to end	Day	9% 5% 2 7% 5% 5% 4 4 6% 8% 45%	4489
June	1st to 10th	Day	4 4 1 4 3 3 4 4 5% 9% 57%	2470
	11th to 20th	Day	5% 3 1 4 5% 4 4 4 6% 6% 57%	2470
	21st to end	Day	6% 3 1 4 3 3 4 5% 6% 10% 56%	2470
July	1st to 10th	Day	7% 5% 2 5% 5% 4 4 4 6% 8% 52%	4120
	11th to 20th	Day	4 3 1 4 3 4 5% 5% 7% 10% 54%	4120
	21st to end	Day	4 3 2 5% 4 4 5% 5% 7% 10% 52%	4466
August	1st to 10th	Day	9% 5% 2 5% 4 4 4 3 6% 8% 51%	4103
	11th to 20th	Day	7% 4 2 5% 4 4 5% 3 6% 9% 52%	4041
	21st to end	Day	4 3 1 4 3 4 4 4 5% 8% 59%	4258
September	1st to 10th	Day	9% 4 1 4 4 3 3 3 4 6% 59%	2138
	11th to 20th	Day	8% 4 1 5% 3 3 3 3 4 6% 59%	2090
	21st to end	Day	8% 4 2 4 3 3 5% 3 4 5% 59%	2090
October	1st to 10th	Day	7% 3 1 2 2 2 2 1 2 5% 73%	3480
	11th to 20th	Day	5% 3 1 3 2 2 3 3 5% 6% 67%	3144
	21st to end	Day	8% 4 1 3 3 2 3 2 4 6% 64%	3310
November	1st to 10th	Day	7% 4 1 4 2 3 2 3 4 6% 63%	1763
	11th to 20th	Day	7% 4 1 4 3 3 3 3 4 5% 62%	1800
	21st to end	Day	10% 6% 1 3 3 2 2 2 3 5% 64%	1800
December	1st to 10th	Day	4 3 1 4 3 2 2 2 4 6% 68%	2940
	11th to 20th	Day	5% 5% 2 4 3 2 2 2 3 6% 65%	3391
	21st to end	Day	11% 11% 4 8% 4 3 4 3 5% 6% 41%	4488
January	1st to 10th	Night	10% 8% 3 9% 5% 5% 4 3 4 6% 44%	5888
	11th to 20th	Night	4 4 2 6% 4 5% 4 3 5% 6% 57%	5900
	21st to end	Night	9% 7% 4 8% 3 3 3 2 3 4 54%	6490
February	1st to 10th	Night	8% 9% 3 6% 4 4 4 3 5% 5% 49%	2530
	11th to 20th	Night	7% 7% 2 7% 4 3 4 4 5% 6% 49%	2338
	21st to end	Night	7% 6% 2 5% 3 3 3 2 5% 6% 58%	1980
March	1st to 10th	Night	7% 4 1 3 3 3 3 3 4 5% 63%	3759
	11th to 20th	Night	7% 5% 2 5% 3 3 4 3 6% 6% 55%	3497
	21st to end	Night	10% 8% 2 5% 3 3 3 3 4 5% 53%	3817
April	1st to 10th	Night	9% 5% 1 5% 3 3 4 3 6% 8% 54%	2020
	11th to 20th	Night	10% 5% 2 6% 4 3 3 3 6% 7% 51%	1802
	21st to end	Night	13% 6% 2 4 3 3 3 4 5% 7% 49%	1710
May	1st to 10th	Night	16% 6% 2 5% 4 3 3 3 4 6% 48%	2850
	11th to 20th	Night	11% 4 2 4 3 3 4 3 6% 8% 50%	2823
	21st to end	Night	9% 4 2 4 3 3 4 4 6% 10% 52%	3098
June	1st to 10th	Night	5% 3 1 3 3 3 4 3 7% 10% 58%	1710
	11th to 20th	Night	5% 3 1 4 3 4 3 6% 7% 10% 54%	1710
	21st to end	Night	4 3 1 4 3 3 4 4 6% 10% 57%	1710
July	1st to 10th	Night	5% 4 1 6% 5% 4 5% 4 6% 9% 51%	2850
	11th to 20th	Night	3 3 1 4 3 3 3 4 7% 12% 55%	2850
	21st to end	Night	6% 3 1 4 4 4 4 4 7% 10% 54%	3097
August	1st to 10th	Night	5% 3 1 5% 4 4 4 4 6% 10% 53%	2836
	11th to 20th	Night	6% 5% 3 5% 4 4 4 4 5% 8% 52%	2798
	21st to end	Night	4 3 1 4 3 3 3 3 5% 9% 61%	3406
September	1st to 10th	Night	8% 4 2 4 3 3 2 2 4 6% 60%	2042
	11th to 20th	Night	7% 4 2 5% 2 4 3 3 5% 6% 60%	2090
	21st to end	Night	6% 3 2 5% 3 3 2 3 5% 6% 61%	2090
October	1st to 10th	Night	6% 2 1 3 2 2 2 2 3 5% 73%	3480
	11th to 20th	Night	5% 2 1 2 2 2 3 2 4 5% 71%	3742
	21st to end	Night	6% 3 1 3 2 2 2 2 4 7% 68%	4240
November	1st to 10th	Night	7% 3 2 4 2 2 2 2 4 6% 66%	2535
	11th to 20th	Night	6% 4 1 3 3 3 3 3 4 6% 64%	2600
	21st to end	Night	9% 6% 2 4 2 3 3 3 4 6% 58%	2600
December	1st to 10th	Night	4 4 2 4 3 2 3 2 4 5% 67%	4250
	11th to 20th	Night	5% 4 2 4 3 3 3 2 5% 6% 63%	4816
	21st to end	Night	11% 11% 4 7% 4 3 3 2 4 6% 45%	6490

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% 5% 12% 25% 17% 4	4078
	11th to 20th	Day	37% 5% 11% 21% 21% 5%	4080
	21st to end	Day	34% 5% 10% 26% 22% 4	4488
February	1st to 10th	Day	39% 4 13% 24% 14% 7%	1885
	11th to 20th	Day	33% 6% 15% 24% 15% 7%	1959
	21st to end	Day	27% 3 11% 26% 26% 7%	1650
March	1st to 10th	Day	26% 4 10% 19% 31% 10%	3321
	11th to 20th	Day	26% 5% 12% 24% 29% 4	3491
	21st to end	Day	35% 6% 14% 32% 10% 2	3814
April	1st to 10th	Day	30% 5% 12% 25% 22% 7%	2156
	11th to 20th	Day	36% 6% 11% 26% 16% 5%	2328
	21st to end	Day	38% 6% 11% 28% 17% 1	2470
May	1st to 10th	Day	38% 7% 13% 20% 13% 8%	4120
	11th to 20th	Day	33% 8% 14% 30% 15%	4086
	21st to end	Day	34% 8% 14% 22% 18% 3	4489
June	1st to 10th	Day	22% 8% 18% 32% 15% 4	2470
	11th to 20th	Day	26% 6% 12% 29% 22% 5%	2470
	21st to end	Day	23% 7% 11% 27% 26% 7%	2470
July	1st to 10th	Day	31% 5% 12% 23% 25% 4	4056
	11th to 20th	Day	23% 7% 15% 28% 23% 4	4051
	21st to end	Day	24% 7% 12% 24% 28% 4	4325
August	1st to 10th	Day	31% 6% 13% 25% 21% 3	4090
	11th to 20th	Day	30% 7% 15% 25% 19% 4	4080
	21st to end	Day	23% 5% 12% 30% 22% 7%	4257
September	1st to 10th	Day	28% 4 8% 26% 24% 10%	2138
	11th to 20th	Day	26% 5% 9% 27% 27% 5%	2090
	21st to end	Day	26% 5% 10% 25% 27% 8%	2090
October	1st to 10th	Day	18% 3 6% 21% 42% 11%	3480
	11th to 20th	Day	18% 3 10% 32% 27% 10%	3144
	21st to end	Day	23% 3 8% 25% 33% 9%	3310
November	1st to 10th	Day	22% 4 10% 29% 28% 7%	1763
	11th to 20th	Day	25% 3 9% 26% 30% 7%	1800
	21st to end	Day	26% 2 8% 29% 28% 6%	1800
December	1st to 10th	Day	19% 3 10% 38% 26% 4	2940
	11th to 20th	Day	23% 3 7% 40% 24% 2	3389
	21st to end	Day	43% 4 8% 28% 14% 2	4488
January	1st to 10th	Night	42% 4 11% 22% 18% 3	5888
	11th to 20th	Night	29% 4 11% 24% 27% 6%	5900
	21st to end	Night	35% 3 9% 23% 22% 8%	6490
February	1st to 10th	Night	37% 5% 13% 23% 15% 7%	2530
	11th to 20th	Night	34% 4 12% 25% 19% 5%	2338
	21st to end	Night	28% 4 8% 21% 26% 13%	1980
March	1st to 10th	Night	24% 4 8% 25% 29% 11%	3759
	11th to 20th	Night	27% 6% 12% 21% 30% 5%	3497
	21st to end	Night	33% 5% 15% 34% 11% 2	3817
April	1st to 10th	Night	27% 6% 13% 22% 26% 6%	2020
	11th to 20th	Night	32% 5% 14% 24% 21% 4	1802
	21st to end	Night	34% 5% 13% 23% 21% 3	1710
May	1st to 10th	Night	37% 6% 12% 21% 14% 11%	2850
	11th to 20th	Night	30% 8% 16% 28% 17% 1	2824
	21st to end	Night	25% 8% 18% 27% 17% 4	3099
June	1st to 10th	Night	20% 7% 20% 31% 18% 4	1710
	11th to 20th	Night	22% 8% 14% 30% 21% 5%	1710
	21st to end	Night	21% 6% 14% 27% 25% 8%	1710
July	1st to 10th	Night	29% 6% 14% 21% 25% 6%	2805
	11th to 20th	Night	20% 5% 13% 29% 28% 5%	2796
	21st to end	Night	24% 6% 14% 29% 24% 4	2999
August	1st to 10th	Night	27% 5% 13% 28% 22% 5%	2826
	11th to 20th	Night	32% 6% 15% 24% 20% 3	2825
	21st to end	Night	21% 5% 13% 35% 22% 6%	3406
September	1st to 10th	Night	26% 4 10% 23% 27% 11%	2042
	11th to 20th	Night	25% 5% 10% 23% 30% 6%	2090
	21st to end	Night	24% 4 10% 22% 30% 9%	2090
October	1st to 10th	Night	18% 3 6% 17% 47% 10%	3480
	11th to 20th	Night	16% 3 9% 27% 32% 14%	3742
	21st to end	Night	19% 2 8% 26% 37% 8%	4240
November	1st to 10th	Night	22% 3 9% 27% 28% 11%	2535
	11th to 20th	Night	23% 3 8% 29% 29% 8%	2600
	21st to end	Night	28% 4 8% 27% 24% 9%	2600
December	1st to 10th	Night	22% 3 10% 39% 23% 3	4250
	11th to 20th	Night	24% 3 7% 36% 25% 6%	4817
	21st to end	Night	41% 4 10% 29% 13% 3	6490

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	11% 10% 39% 29% 9% 2	300
	11th to 20th	Day	14% 12% 43% 22% 8% 1	300
	21st to end	Day	8% 9% 49% 27% 6%	330
February	1st to 10th	Day	14% 14% 45% 21% 6%	300
	11th to 20th	Day	12% 12% 45% 23% 7% 1	300
	21st to end	Day	8% 18% 47% 23% 4	249
March	1st to 10th	Day	10% 14% 45% 25% 6% 1	300
	11th to 20th	Day	16% 15% 39% 20% 8% 1	273
	21st to end	Day	16% 20% 38% 21% 4 1	297
April	1st to 10th	Day	13% 17% 39% 27% 4 1	336
	11th to 20th	Day	13% 16% 40% 27% 4	526
	21st to end	Day	17% 16% 39% 19% 8% 2	650
May	1st to 10th	Day	13% 10% 38% 28% 9% 1	653
	11th to 20th	Day	16% 7% 31% 27% 16% 3	675
	21st to end	Day	13% 10% 31% 32% 12% 3	734
June	1st to 10th	Day	5% 5% 25% 37% 21% 7%	680
	11th to 20th	Day	5% 5% 33% 38% 17% 2	680
	21st to end	Day	6% 6% 30% 42% 15% 2	680
July	1st to 10th	Day	6% 3 18% 39% 28% 7%	671
	11th to 20th	Day	3 2 18% 40% 31% 6%	668
	21st to end	Day	6% 2 13% 41% 28% 9%	739
August	1st to 10th	Day	8% 2 15% 43% 26% 6%	676
	11th to 20th	Day	7% 2 17% 45% 26% 3	665
	21st to end	Day	6% 3 17% 40% 27% 8%	591
September	1st to 10th	Day	10% 3 15% 36% 31% 5%	348
	11th to 20th	Day	3 2 22% 45% 17% 11%	300
	21st to end	Day	12% 6% 27% 26% 23% 6%	300
October	1st to 10th	Day	15% 8% 28% 26% 18% 5%	300
	11th to 20th	Day	4 9% 43% 27% 14% 3	300
	21st to end	Day	17% 13% 32% 25% 11% 2	330
November	1st to 10th	Day	11% 14% 33% 27% 12% 2	300
	11th to 20th	Day	13% 12% 41% 23% 10% 1	300
	21st to end	Day	16% 9% 33% 27% 12% 2	300
December	1st to 10th	Day	7% 9% 41% 29% 12% 3	300
	11th to 20th	Day	11% 9% 44% 28% 8%	300
	21st to end	Day	17% 15% 41% 22% 5%	330
January	1st to 10th	Night	10% 8% 38% 37% 7%	1000
	11th to 20th	Night	9% 12% 38% 33% 8% 1	1000
	21st to end	Night	9% 9% 45% 33% 5%	1100
February	1st to 10th	Night	12% 9% 42% 32% 4	930
	11th to 20th	Night	11% 12% 43% 31% 3	784
	21st to end	Night	9% 14% 43% 30% 4	660
March	1st to 10th	Night	10% 15% 39% 32% 4	744
	11th to 20th	Night	15% 9% 37% 31% 8%	575
	21st to end	Night	17% 15% 41% 24% 4 1	627
April	1st to 10th	Night	12% 12% 45% 26% 5%	570
	11th to 20th	Night	13% 15% 40% 28% 4	563
	21st to end	Night	16% 14% 37% 27% 6%	570
May	1st to 10th	Night	15% 10% 38% 31% 6%	570
	11th to 20th	Night	14% 7% 31% 37% 10% 1	561
	21st to end	Night	11% 10% 33% 32% 12% 2	617
June	1st to 10th	Night	5% 6% 29% 42% 16% 1	570
	11th to 20th	Night	4 6% 37% 42% 10%	570
	21st to end	Night	4 3 36% 47% 9% 1	570
July	1st to 10th	Night	6% 2 23% 48% 20% 1	555
	11th to 20th	Night	3 2 24% 50% 20% 1	552
	21st to end	Night	7% 2 19% 47% 24% 1	624
August	1st to 10th	Night	4 2 19% 53% 21% 1	567
	11th to 20th	Night	9% 1 20% 52% 18% 1	564
	21st to end	Night	4 1 21% 47% 24% 2	627
September	1st to 10th	Night	9% 2 25% 44% 19% 1	570
	11th to 20th	Night	9% 2 35% 37% 16% 1	570
	21st to end	Night	7% 5% 31% 40% 15% 1	570
October	1st to 10th	Night	11% 6% 31% 35% 15% 1	570
	11th to 20th	Night	9% 8% 40% 34% 9%	736
	21st to end	Night	12% 9% 35% 31% 12% 1	907
November	1st to 10th	Night	9% 9% 35% 37% 11%	975
	11th to 20th	Night	9% 11% 41% 33% 7%	1000
	21st to end	Night	12% 10% 32% 35% 10% 1	1000
December	1st to 10th	Night	9% 9% 38% 37% 7% 1	1000
	11th to 20th	Night	12% 11% 40% 32% 5%	1000
	21st to end	Night	14% 11% 37% 33% 5%	1100

Page generated at 2025-03-09 07:08:42. Version ac07

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