Lawton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lawton clear sky chart from 2005-11-06 to 2024-11-10.

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	9% 5% 2 4 3 3 4 3 5% 7% 56%	101151
	Night	8% 4 1 4 3 3 3 3 5% 7% 59%	98107
Transparency	Day	28% 4 9% 25% 25% 9%	104946
	Night	25% 4 8% 25% 27% 11%	102439
Seeing	Day	10% 7% 25% 31% 22% 6%	15315
	Night	10% 7% 31% 37% 14% 1	25188

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	7% 6% 2 6% 3 4 4 3 5% 7% 54%	2847
	11th to 20th	Day	7% 5% 1 3 2 2 3 2 4 6% 64%	2850
	21st to end	Day	16% 8% 3 4 3 3 2 2 4 5% 49%	3135
February	1st to 10th	Day	9% 7% 2 5% 4 3 2 4 3 5% 55%	1885
	11th to 20th	Day	11% 5% 1 5% 3 3 4 3 4 6% 55%	1849
	21st to end	Day	13% 8% 2 5% 3 3 3 2 3 4 54%	1570
March	1st to 10th	Day	12% 5% 1 4 3 3 3 3 4 6% 58%	3304
	11th to 20th	Day	11% 6% 2 5% 3 3 4 3 5% 6% 54%	3480
	21st to end	Day	12% 8% 3 7% 4 4 3 3 5% 7% 44%	3814
April	1st to 10th	Day	10% 4 2 4 3 3 4 3 4 6% 57%	2090
	11th to 20th	Day	14% 5% 1 5% 3 3 4 3 4 6% 51%	2246
	21st to end	Day	12% 5% 2 4 3 4 3 3 5% 6% 53%	2470
May	1st to 10th	Day	17% 7% 3 5% 4 3 3 3 5% 6% 44%	4082
	11th to 20th	Day	13% 5% 2 5% 4 3 4 3 5% 6% 50%	4082
	21st to end	Day	13% 6% 2 6% 4 4 4 3 5% 6% 46%	4477
June	1st to 10th	Day	6% 5% 2 4 4 4 4 4 7% 9% 51%	2470
	11th to 20th	Day	5% 3 1 4 4 4 4 3 6% 8% 56%	2470
	21st to end	Day	5% 3 1 3 2 3 4 3 6% 7% 62%	2470
July	1st to 10th	Day	6% 5% 2 4 4 5% 4 4 7% 8% 51%	4120
	11th to 20th	Day	4 3 2 4 3 4 3 3 5% 8% 60%	4120
	21st to end	Day	3 3 1 3 3 3 4 3 5% 9% 62%	4465
August	1st to 10th	Day	4 3 1 3 3 3 3 3 5% 8% 63%	4104
	11th to 20th	Day	4 3 1 4 3 3 4 4 6% 10% 59%	3982
	21st to end	Day	3 2 1 3 3 3 4 3 5% 7% 66%	4148
September	1st to 10th	Day	8% 4 1 4 3 4 4 3 4 6% 58%	2090
	11th to 20th	Day	10% 5% 2 6% 4 4 4 4 5% 5% 50%	2090
	21st to end	Day	9% 3 1 4 3 3 3 3 5% 6% 60%	2090
October	1st to 10th	Day	7% 3 1 4 3 3 3 3 4 6% 62%	2090
	11th to 20th	Day	9% 3 1 3 3 2 2 1 3 4 68%	1924
	21st to end	Day	11% 4 2 4 2 2 3 2 3 4 63%	2090
November	1st to 10th	Day	10% 4 1 3 3 2 3 3 4 6% 61%	1821
	11th to 20th	Day	6% 3 1 2 3 2 2 2 4 6% 68%	1710
	21st to end	Day	12% 5% 1 3 3 1 3 3 3 5% 60%	1710
December	1st to 10th	Day	8% 4 1 5% 3 3 3 3 3 7% 57%	1710
	11th to 20th	Day	11% 6% 2 5% 4 4 4 2 4 5% 52%	2161
	21st to end	Day	13% 8% 2 5% 4 3 4 4 5% 6% 47%	3135
January	1st to 10th	Night	12% 5% 1 4 3 3 3 3 5% 6% 54%	4108
	11th to 20th	Night	5% 4 1 3 3 2 3 2 4 6% 65%	4120
	21st to end	Night	15% 9% 2 4 2 2 3 2 4 4 52%	4532
February	1st to 10th	Night	11% 6% 2 5% 4 3 3 3 4 5% 54%	2309
	11th to 20th	Night	10% 6% 2 4 3 3 3 3 3 7% 56%	2218
	21st to end	Night	10% 6% 2 5% 3 3 3 3 5% 6% 56%	1884
March	1st to 10th	Night	7% 6% 2 5% 3 3 3 3 4 5% 58%	3552
	11th to 20th	Night	11% 4 1 3 2 2 2 2 4 6% 62%	3480
	21st to end	Night	8% 6% 2 7% 4 4 4 4 6% 6% 50%	3817
April	1st to 10th	Night	8% 5% 1 4 3 3 3 3 5% 6% 58%	2090
	11th to 20th	Night	12% 4 1 4 3 3 3 3 5% 6% 55%	1879
	21st to end	Night	13% 4 2 3 3 3 3 2 5% 7% 55%	1710
May	1st to 10th	Night	18% 6% 2 4 3 3 3 3 3 4 51%	2823
	11th to 20th	Night	12% 6% 2 5% 3 3 4 3 6% 8% 49%	2823
	21st to end	Night	11% 4 1 4 3 3 3 3 5% 7% 56%	3090
June	1st to 10th	Night	4 2 1 3 3 3 3 4 7% 12% 58%	1710
	11th to 20th	Night	5% 3 1 3 3 3 4 4 7% 9% 59%	1710
	21st to end	Night	4 3 1 3 3 3 3 3 5% 7% 65%	1710
July	1st to 10th	Night	5% 4 2 5% 4 3 4 4 6% 9% 54%	2850
	11th to 20th	Night	2 1 1 2 2 3 4 3 6% 12% 65%	2850
	21st to end	Night	3 2 1 3 2 3 3 3 5% 7% 67%	3098
August	1st to 10th	Night	2 1 1 3 3 3 3 3 6% 9% 67%	2836
	11th to 20th	Night	4 2 1 3 3 4 4 4 7% 10% 59%	2852
	21st to end	Night	2 1 1 3 2 3 4 4 6% 10% 64%	3516
September	1st to 10th	Night	8% 4 1 4 2 3 3 3 6% 6% 60%	2090
	11th to 20th	Night	9% 5% 2 6% 4 4 4 3 5% 6% 53%	2090
	21st to end	Night	7% 3 1 4 3 2 3 4 4 6% 62%	2090
October	1st to 10th	Night	6% 3 1 4 3 2 3 4 4 7% 63%	2090
	11th to 20th	Night	8% 4 1 3 3 2 3 2 3 5% 67%	2236
	21st to end	Night	11% 3 1 3 2 3 2 2 3 5% 65%	2508
November	1st to 10th	Night	8% 4 1 3 2 2 2 2 3 5% 66%	2458
	11th to 20th	Night	5% 3 1 3 2 3 3 3 3 6% 67%	2470
	21st to end	Night	11% 5% 2 4 2 2 3 2 5% 5% 59%	2470
December	1st to 10th	Night	9% 4 1 4 2 3 3 3 4 6% 62%	2470
	11th to 20th	Night	9% 6% 2 5% 4 4 3 2 4 6% 55%	3036
	21st to end	Night	13% 5% 1 3 4 3 3 3 4 5% 55%	4532

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	29% 4 9% 26% 27% 6%	2848
	11th to 20th	Day	23% 2 10% 24% 37% 4	2850
	21st to end	Day	40% 2 5% 24% 24% 5%	3135
February	1st to 10th	Day	33% 3 7% 24% 26% 7%	1885
	11th to 20th	Day	32% 3 5% 28% 23% 9%	1859
	21st to end	Day	37% 3 4 16% 29% 13%	1570
March	1st to 10th	Day	29% 3 7% 16% 27% 19%	3304
	11th to 20th	Day	33% 4 9% 23% 26% 5%	3480
	21st to end	Day	40% 4 8% 25% 18% 5%	3814
April	1st to 10th	Day	28% 3 9% 25% 22% 12%	2090
	11th to 20th	Day	34% 4 9% 19% 22% 12%	2246
	21st to end	Day	32% 4 10% 25% 23% 5%	2470
May	1st to 10th	Day	41% 4 9% 18% 17% 11%	4120
	11th to 20th	Day	35% 6% 11% 26% 18% 4	4086
	21st to end	Day	37% 5% 11% 20% 16% 10%	4489
June	1st to 10th	Day	27% 7% 16% 28% 17% 5%	2470
	11th to 20th	Day	24% 6% 12% 26% 25% 6%	2470
	21st to end	Day	20% 6% 13% 28% 25% 8%	2470
July	1st to 10th	Day	28% 6% 11% 30% 19% 5%	4056
	11th to 20th	Day	21% 5% 9% 32% 28% 5%	4051
	21st to end	Day	18% 4 12% 32% 30% 3	4325
August	1st to 10th	Day	19% 5% 10% 25% 30% 12%	4090
	11th to 20th	Day	19% 6% 12% 32% 24% 7%	4021
	21st to end	Day	17% 5% 12% 37% 24% 4	4147
September	1st to 10th	Day	27% 4 8% 23% 25% 13%	2090
	11th to 20th	Day	35% 5% 10% 19% 24% 7%	2090
	21st to end	Day	26% 4 6% 24% 31% 10%	2090
October	1st to 10th	Day	15% 3 6% 15% 38% 24%	3480
	11th to 20th	Day	17% 3 7% 21% 35% 17%	3177
	21st to end	Day	21% 2 5% 27% 34% 9%	3428
November	1st to 10th	Day	26% 3 7% 24% 28% 12%	1821
	11th to 20th	Day	19% 2 7% 29% 31% 11%	1710
	21st to end	Day	28% 3 5% 24% 28% 12%	1710
December	1st to 10th	Day	29% 4 10% 28% 24% 6%	1710
	11th to 20th	Day	36% 3 7% 17% 29% 8%	2159
	21st to end	Day	37% 4 7% 24% 24% 5%	3135
January	1st to 10th	Night	31% 3 7% 25% 28% 6%	4108
	11th to 20th	Night	21% 3 13% 23% 33% 8%	4120
	21st to end	Night	37% 2 5% 20% 26% 9%	4532
February	1st to 10th	Night	34% 3 6% 21% 26% 9%	2309
	11th to 20th	Night	30% 3 7% 22% 26% 11%	2218
	21st to end	Night	30% 3 4 19% 25% 18%	1884
March	1st to 10th	Night	30% 3 4 17% 21% 24%	3552
	11th to 20th	Night	24% 3 8% 29% 27% 9%	3480
	21st to end	Night	34% 4 9% 24% 23% 5%	3817
April	1st to 10th	Night	27% 4 9% 21% 23% 16%	2090
	11th to 20th	Night	29% 5% 9% 22% 22% 13%	1879
	21st to end	Night	30% 4 9% 27% 23% 7%	1710
May	1st to 10th	Night	38% 4 9% 16% 23% 10%	2850
	11th to 20th	Night	34% 6% 12% 24% 20% 4	2824
	21st to end	Night	28% 5% 11% 22% 22% 12%	3099
June	1st to 10th	Night	18% 7% 19% 33% 18% 5%	1710
	11th to 20th	Night	21% 5% 15% 27% 26% 7%	1710
	21st to end	Night	18% 4 10% 28% 30% 10%	1710
July	1st to 10th	Night	26% 6% 11% 36% 19% 3	2805
	11th to 20th	Night	12% 4 9% 40% 30% 4	2796
	21st to end	Night	17% 4 11% 33% 32% 3	2999
August	1st to 10th	Night	14% 4 8% 26% 35% 13%	2826
	11th to 20th	Night	19% 5% 9% 33% 27% 7%	2879
	21st to end	Night	14% 6% 13% 38% 24% 5%	3516
September	1st to 10th	Night	25% 4 9% 21% 28% 12%	2090
	11th to 20th	Night	32% 5% 8% 20% 24% 11%	2090
	21st to end	Night	23% 4 5% 24% 30% 14%	2090
October	1st to 10th	Night	14% 3 5% 16% 35% 25%	3480
	11th to 20th	Night	18% 3 6% 18% 35% 20%	3709
	21st to end	Night	20% 3 5% 28% 33% 12%	4120
November	1st to 10th	Night	24% 2 6% 22% 31% 15%	2458
	11th to 20th	Night	20% 3 6% 24% 33% 14%	2470
	21st to end	Night	28% 3 6% 22% 28% 15%	2470
December	1st to 10th	Night	25% 3 8% 26% 27% 11%	2470
	11th to 20th	Night	33% 3 5% 20% 29% 10%	3037
	21st to end	Night	32% 3 7% 21% 27% 9%	4532

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	13% 12% 31% 33% 9% 1	270
	11th to 20th	Day	16% 15% 34% 26% 8% 1	270
	21st to end	Day	13% 11% 42% 23% 11%	297
February	1st to 10th	Day	16% 14% 41% 25% 3	270
	11th to 20th	Day	14% 13% 46% 22% 4	270
	21st to end	Day	20% 17% 43% 16% 4	225
March	1st to 10th	Day	16% 16% 36% 24% 8%	270
	11th to 20th	Day	17% 18% 40% 17% 7% 2	270
	21st to end	Day	15% 14% 42% 20% 7% 1	297
April	1st to 10th	Day	14% 18% 31% 26% 10%	270
	11th to 20th	Day	18% 14% 42% 22% 4	444
	21st to end	Day	14% 15% 35% 27% 7% 2	650
May	1st to 10th	Day	10% 10% 40% 30% 8% 1	653
	11th to 20th	Day	14% 8% 29% 29% 16% 3	675
	21st to end	Day	13% 7% 33% 26% 17% 4	734
June	1st to 10th	Day	7% 4 19% 38% 28% 5%	680
	11th to 20th	Day	6% 3 23% 43% 21% 5%	680
	21st to end	Day	4 2 15% 41% 30% 7%	680
July	1st to 10th	Day	4 1 11% 35% 38% 12%	671
	11th to 20th	Day	3 1 9% 35% 40% 12%	668
	21st to end	Day	4 1 5% 32% 42% 17%	739
August	1st to 10th	Day	5% 1 8% 36% 41% 10%	676
	11th to 20th	Day	7% 2 10% 34% 38% 9%	632
	21st to end	Day	5% 1 4 33% 42% 16%	520
September	1st to 10th	Day	8% 1 6% 28% 41% 16%	300
	11th to 20th	Day	6% 2 8% 35% 35% 14%	300
	21st to end	Day	14% 2 12% 34% 26% 12%	300
October	1st to 10th	Day	7% 3 22% 35% 24% 9%	300
	11th to 20th	Day	9% 9% 27% 39% 15% 1	300
	21st to end	Day	18% 12% 27% 25% 17% 2	330
November	1st to 10th	Day	16% 4 35% 27% 15% 3	297
	11th to 20th	Day	11% 12% 31% 26% 16% 4	270
	21st to end	Day	17% 11% 37% 23% 10% 1	270
December	1st to 10th	Day	10% 9% 40% 28% 11% 2	270
	11th to 20th	Day	14% 13% 31% 30% 11% 1	270
	21st to end	Day	19% 12% 38% 24% 7%	297
January	1st to 10th	Night	9% 10% 38% 35% 7%	950
	11th to 20th	Night	12% 10% 35% 37% 7%	950
	21st to end	Night	11% 10% 35% 36% 8%	1045
February	1st to 10th	Night	15% 11% 38% 31% 6%	789
	11th to 20th	Night	12% 13% 40% 29% 6%	744
	21st to end	Night	14% 14% 41% 27% 3	628
March	1st to 10th	Night	11% 12% 40% 32% 4	656
	11th to 20th	Night	17% 11% 36% 30% 6%	570
	21st to end	Night	10% 15% 42% 27% 5%	627
April	1st to 10th	Night	10% 13% 48% 24% 5%	570
	11th to 20th	Night	13% 9% 48% 25% 5%	563
	21st to end	Night	14% 11% 41% 27% 6% 1	570
May	1st to 10th	Night	11% 8% 44% 30% 7%	570
	11th to 20th	Night	11% 6% 36% 34% 12% 1	561
	21st to end	Night	7% 5% 36% 37% 12% 3	617
June	1st to 10th	Night	4 2 24% 45% 23% 1	570
	11th to 20th	Night	5% 3 29% 51% 12%	570
	21st to end	Night	4 1 22% 49% 22% 1	570
July	1st to 10th	Night	5% 1 10% 48% 33% 3	555
	11th to 20th	Night	2 1 11% 53% 31% 3	552
	21st to end	Night	3 6% 50% 38% 3	624
August	1st to 10th	Night	2 1 11% 48% 36% 1	567
	11th to 20th	Night	6% 12% 46% 35% 1	564
	21st to end	Night	3 8% 47% 40% 2	627
September	1st to 10th	Night	9% 2 12% 41% 35% 1	570
	11th to 20th	Night	12% 2 19% 38% 28% 1	570
	21st to end	Night	8% 2 19% 46% 23% 2	570
October	1st to 10th	Night	7% 3 27% 41% 21% 1	570
	11th to 20th	Night	10% 6% 32% 38% 13% 1	716
	21st to end	Night	13% 9% 31% 34% 12% 1	836
November	1st to 10th	Night	11% 5% 34% 38% 11% 1	902
	11th to 20th	Night	6% 8% 37% 35% 13% 1	950
	21st to end	Night	14% 10% 32% 34% 10%	950
December	1st to 10th	Night	11% 8% 34% 37% 9%	950
	11th to 20th	Night	15% 8% 37% 33% 6%	950
	21st to end	Night	14% 8% 39% 32% 7%	1045

Page generated at 2024-11-07 05:55:48. Version ac07

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