Raymore-Peculiar High School
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Raymore-Peculiar High School clear sky chart from 2005-11-06 to 2026-09-29.

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 3 5% 7% 45%	148677
	Night	11% 7% 2 6% 4 4 4 3 5% 7% 48%	143107
Transparency	Day	37% 5% 12% 26% 17% 3	152289
	Night	35% 4 11% 26% 19% 4	147575
Seeing	Day	15% 10% 29% 27% 15% 4	18295
	Night	15% 9% 31% 32% 13% 1	28015

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% 10% 3 9% 4 4 4 3 4 5% 41%	5289
	11th to 20th	Day	6% 7% 3 9% 6% 7% 6% 3 5% 6% 43%	5310
	21st to end	Day	12% 14% 4 8% 4 4 3 3 4 4 40%	5812
February	1st to 10th	Day	15% 10% 5% 7% 4 4 4 3 4 6% 38%	1890
	11th to 20th	Day	13% 10% 3 7% 5% 5% 3 3 4 6% 41%	1844
	21st to end	Day	10% 9% 3 7% 4 3 4 3 5% 7% 44%	1793
March	1st to 10th	Day	13% 9% 3 6% 3 3 3 2 3 5% 50%	5046
	11th to 20th	Day	10% 6% 2 4 3 3 3 3 5% 6% 55%	5090
	21st to end	Day	13% 10% 4 8% 5% 4 5% 3 6% 7% 36%	5583
April	1st to 10th	Day	15% 8% 2 6% 4 3 4 3 5% 6% 44%	2436
	11th to 20th	Day	15% 8% 2 6% 4 4 4 3 6% 6% 41%	2494
	21st to end	Day	19% 9% 3 8% 5% 4 5% 3 4 6% 35%	2640
May	1st to 10th	Day	16% 7% 2 6% 4 4 4 3 5% 7% 43%	7617
	11th to 20th	Day	14% 5% 2 6% 4 4 4 4 5% 8% 45%	7627
	21st to end	Day	21% 6% 2 6% 4 4 4 3 4 7% 38%	8624
June	1st to 10th	Day	8% 4 2 5% 4 4 4 5% 7% 10% 47%	2940
	11th to 20th	Day	7% 6% 2 6% 5% 5% 5% 4 7% 9% 47%	2940
	21st to end	Day	7% 4 2 5% 4 4 5% 5% 7% 8% 50%	2940
July	1st to 10th	Day	8% 5% 2 7% 4 4 5% 4 6% 9% 46%	7682
	11th to 20th	Day	6% 4 1 5% 3 4 4 4 6% 9% 53%	7680
	21st to end	Day	9% 5% 2 7% 5% 5% 5% 5% 8% 10% 39%	8337
August	1st to 10th	Day	6% 4 2 6% 4 4 5% 4 6% 9% 51%	6014
	11th to 20th	Day	9% 5% 2 6% 5% 4 4 4 7% 9% 46%	5948
	21st to end	Day	5% 4 1 5% 3 3 4 4 6% 10% 55%	6172
September	1st to 10th	Day	11% 5% 2 4 3 3 3 4 5% 7% 53%	2520
	11th to 20th	Day	8% 5% 1 5% 4 4 5% 4 6% 8% 50%	2348
	21st to end	Day	9% 5% 2 5% 4 4 5% 3 4 6% 52%	2263
October	1st to 10th	Day	11% 6% 2 4 3 3 3 3 6% 7% 54%	2000
	11th to 20th	Day	13% 6% 2 5% 3 2 3 3 4 6% 56%	2000
	21st to end	Day	17% 7% 3 6% 4 2 3 3 4 6% 47%	2200
November	1st to 10th	Day	10% 6% 2 6% 3 3 3 3 4 6% 55%	2058
	11th to 20th	Day	15% 6% 2 5% 2 3 3 3 4 6% 51%	1824
	21st to end	Day	15% 9% 3 6% 3 3 3 3 4 4 47%	1680
December	1st to 10th	Day	6% 6% 2 6% 5% 3 3 3 5% 7% 54%	2690
	11th to 20th	Day	10% 7% 3 7% 4 4 4 3 4 6% 49%	3088
	21st to end	Day	18% 16% 7% 10% 4 3 4 3 3 5% 26%	4258
January	1st to 10th	Night	12% 10% 4 12% 5% 4 3 2 3 5% 39%	7634
	11th to 20th	Night	8% 8% 3 8% 5% 6% 4 3 3 5% 49%	7680
	21st to end	Night	13% 10% 4 8% 4 4 4 3 4 5% 40%	8402
February	1st to 10th	Night	12% 10% 3 8% 5% 4 4 3 5% 6% 40%	2730
	11th to 20th	Night	12% 9% 3 7% 4 4 4 3 5% 6% 42%	2663
	21st to end	Night	12% 8% 2 7% 4 4 4 3 4 5% 48%	2031
March	1st to 10th	Night	14% 9% 3 5% 3 3 3 3 4 5% 49%	5029
	11th to 20th	Night	8% 7% 2 4 3 3 3 3 6% 7% 55%	5090
	21st to end	Night	13% 8% 3 8% 5% 4 4 3 5% 7% 39%	5588
April	1st to 10th	Night	13% 7% 2 5% 4 3 3 3 5% 6% 48%	2184
	11th to 20th	Night	13% 7% 3 6% 4 3 3 3 5% 6% 46%	2075
	21st to end	Night	17% 6% 3 6% 4 3 4 3 5% 5% 43%	1976
May	1st to 10th	Night	16% 7% 2 4 4 3 4 3 4 6% 46%	5266
	11th to 20th	Night	12% 7% 2 5% 4 4 3 3 5% 7% 49%	5265
	21st to end	Night	17% 7% 3 6% 4 3 4 3 5% 5% 44%	5556
June	1st to 10th	Night	6% 3 1 4 4 4 5% 4 7% 9% 53%	1680
	11th to 20th	Night	5% 4 2 5% 4 4 4 4 6% 11% 51%	1680
	21st to end	Night	5% 3 1 3 3 3 4 4 6% 9% 59%	1680
July	1st to 10th	Night	8% 4 2 5% 3 3 4 4 7% 10% 51%	5299
	11th to 20th	Night	6% 4 1 4 3 4 4 3 6% 9% 56%	5307
	21st to end	Night	7% 4 2 6% 4 4 5% 5% 8% 11% 43%	5770
August	1st to 10th	Night	4 2 1 4 3 3 5% 4 6% 9% 60%	4156
	11th to 20th	Night	9% 5% 1 5% 3 4 4 4 6% 8% 52%	4118
	21st to end	Night	4 3 2 5% 3 3 4 3 5% 8% 61%	4956
September	1st to 10th	Night	10% 5% 2 5% 3 3 3 3 4 6% 57%	2100
	11th to 20th	Night	8% 5% 2 4 4 3 4 4 6% 7% 54%	2268
	21st to end	Night	7% 5% 1 5% 4 4 4 3 5% 6% 56%	2293
October	1st to 10th	Night	9% 5% 1 4 3 3 4 3 4 5% 59%	2400
	11th to 20th	Night	12% 5% 2 5% 3 3 3 2 3 5% 56%	2400
	21st to end	Night	16% 7% 2 5% 3 3 3 2 4 4 51%	2640
November	1st to 10th	Night	11% 4 2 3 3 3 2 2 3 6% 60%	2460
	11th to 20th	Night	10% 6% 2 5% 4 3 3 3 4 7% 54%	2788
	21st to end	Night	15% 8% 2 6% 3 3 3 3 4 5% 50%	2940
December	1st to 10th	Night	8% 5% 2 5% 4 3 4 3 5% 6% 55%	4720
	11th to 20th	Night	12% 7% 3 6% 3 3 4 3 5% 6% 46%	5339
	21st to end	Night	19% 16% 5% 9% 4 4 3 3 3 4 30%	6944

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	47% 3 10% 27% 11% 2	5290
	11th to 20th	Day	41% 3 11% 25% 15% 4	5310
	21st to end	Day	47% 3 11% 18% 17% 3	5812
February	1st to 10th	Day	47% 4 12% 23% 11% 2	1890
	11th to 20th	Day	45% 4 11% 21% 15% 3	1853
	21st to end	Day	39% 3 10% 25% 18% 4	1793
March	1st to 10th	Day	39% 3 7% 22% 23% 7%	5046
	11th to 20th	Day	31% 3 10% 22% 27% 7%	5090
	21st to end	Day	47% 5% 17% 25% 6% 1	5585
April	1st to 10th	Day	41% 5% 12% 24% 16% 2	2436
	11th to 20th	Day	44% 4 13% 22% 16% 1	2494
	21st to end	Day	51% 4 10% 23% 10% 1	2640
May	1st to 10th	Day	41% 6% 10% 26% 16% 1	7655
	11th to 20th	Day	37% 6% 12% 24% 19% 2	7631
	21st to end	Day	46% 6% 9% 26% 12% 1	8638
June	1st to 10th	Day	31% 6% 17% 29% 15% 2	2940
	11th to 20th	Day	32% 6% 14% 30% 16% 2	2940
	21st to end	Day	29% 6% 16% 29% 15% 4	2940
July	1st to 10th	Day	34% 6% 14% 25% 18% 2	7618
	11th to 20th	Day	27% 7% 16% 29% 17% 5%	7611
	21st to end	Day	35% 8% 17% 32% 7% 1	8155
August	1st to 10th	Day	29% 6% 14% 28% 21% 1	6000
	11th to 20th	Day	33% 7% 17% 31% 12% 1	5987
	21st to end	Day	24% 6% 15% 38% 14% 3	6171
September	1st to 10th	Day	31% 5% 13% 26% 20% 6%	2520
	11th to 20th	Day	31% 5% 13% 26% 22% 2	2348
	21st to end	Day	33% 5% 9% 27% 23% 3	2263
October	1st to 10th	Day	19% 2 7% 23% 40% 9%	3260
	11th to 20th	Day	20% 3 5% 25% 40% 8%	3240
	21st to end	Day	33% 3 10% 25% 25% 3	3538
November	1st to 10th	Day	31% 4 11% 30% 19% 5%	2058
	11th to 20th	Day	36% 3 10% 27% 22% 4	1824
	21st to end	Day	42% 3 9% 27% 18% 1	1680
December	1st to 10th	Day	31% 4 13% 35% 16% 1	2690
	11th to 20th	Day	37% 3 12% 33% 13% 1	3085
	21st to end	Day	62% 3 11% 16% 6% 1	4258
January	1st to 10th	Night	49% 3 12% 24% 11% 1	7635
	11th to 20th	Night	40% 3 8% 26% 19% 4	7680
	21st to end	Night	47% 3 11% 19% 16% 4	8402
February	1st to 10th	Night	44% 4 11% 23% 15% 3	2730
	11th to 20th	Night	42% 4 11% 23% 17% 3	2664
	21st to end	Night	38% 3 8% 24% 21% 6%	2031
March	1st to 10th	Night	38% 3 8% 21% 24% 5%	5029
	11th to 20th	Night	28% 4 7% 23% 31% 7%	5090
	21st to end	Night	43% 5% 16% 24% 10% 2	5588
April	1st to 10th	Night	37% 3 11% 22% 23% 4	2184
	11th to 20th	Night	39% 3 9% 27% 18% 4	2075
	21st to end	Night	42% 4 12% 26% 15% 1	1976
May	1st to 10th	Night	39% 6% 12% 25% 17% 1	5293
	11th to 20th	Night	35% 5% 12% 23% 19% 5%	5266
	21st to end	Night	42% 6% 9% 24% 19% 1	5567
June	1st to 10th	Night	25% 7% 18% 30% 17% 3	1680
	11th to 20th	Night	27% 6% 14% 31% 20% 2	1680
	21st to end	Night	21% 6% 14% 33% 22% 4	1680
July	1st to 10th	Night	28% 6% 16% 26% 21% 2	5256
	11th to 20th	Night	24% 7% 15% 30% 19% 5%	5256
	21st to end	Night	30% 7% 17% 37% 8% 1	5641
August	1st to 10th	Night	20% 5% 17% 28% 25% 4	4146
	11th to 20th	Night	29% 6% 14% 34% 16% 1	4145
	21st to end	Night	22% 5% 13% 40% 17% 3	4956
September	1st to 10th	Night	30% 4 9% 28% 22% 8%	2100
	11th to 20th	Night	28% 6% 10% 29% 23% 4	2268
	21st to end	Night	29% 4 8% 26% 28% 4	2293
October	1st to 10th	Night	17% 2 6% 21% 43% 10%	3920
	11th to 20th	Night	22% 3 6% 25% 30% 14%	3899
	21st to end	Night	33% 3 7% 29% 24% 3	4252
November	1st to 10th	Night	28% 3 12% 29% 23% 6%	2460
	11th to 20th	Night	32% 3 9% 26% 24% 5%	2788
	21st to end	Night	39% 3 8% 29% 18% 3	2940
December	1st to 10th	Night	30% 4 14% 34% 17% 1	4720
	11th to 20th	Night	39% 3 11% 28% 17% 2	5341
	21st to end	Night	59% 4 9% 20% 7% 1	6944

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	22% 15% 38% 20% 5%	330
	11th to 20th	Day	25% 17% 39% 17% 1	330
	21st to end	Day	17% 15% 46% 18% 4	363
February	1st to 10th	Day	24% 17% 41% 15% 3	330
	11th to 20th	Day	22% 21% 38% 16% 3 1	330
	21st to end	Day	18% 25% 42% 11% 4	273
March	1st to 10th	Day	22% 20% 38% 15% 4	330
	11th to 20th	Day	30% 13% 34% 18% 4	330
	21st to end	Day	31% 19% 33% 13% 4	363
April	1st to 10th	Day	26% 15% 37% 16% 5% 1	456
	11th to 20th	Day	22% 17% 36% 17% 6% 1	532
	21st to end	Day	24% 16% 33% 19% 7%	660
May	1st to 10th	Day	19% 13% 37% 22% 8% 1	753
	11th to 20th	Day	19% 11% 30% 27% 11% 3	775
	21st to end	Day	20% 8% 27% 27% 14% 5%	844
June	1st to 10th	Day	8% 5% 22% 35% 24% 7%	780
	11th to 20th	Day	9% 6% 26% 38% 18% 4	780
	21st to end	Day	6% 7% 34% 33% 17% 2	780
July	1st to 10th	Day	12% 3 15% 30% 29% 11%	771
	11th to 20th	Day	4 3 19% 38% 27% 9%	768
	21st to end	Day	8% 2 17% 36% 30% 7%	849
August	1st to 10th	Day	7% 3 18% 38% 29% 5%	776
	11th to 20th	Day	9% 3 19% 34% 30% 6%	765
	21st to end	Day	8% 3 14% 33% 32% 10%	669
September	1st to 10th	Day	12% 3 14% 38% 27% 7%	570
	11th to 20th	Day	6% 3 20% 43% 22% 6%	398
	21st to end	Day	13% 5% 27% 32% 16% 6%	354
October	1st to 10th	Day	14% 7% 29% 28% 16% 6%	330
	11th to 20th	Day	13% 16% 39% 24% 7% 1	330
	21st to end	Day	27% 12% 35% 19% 6%	363
November	1st to 10th	Day	16% 13% 39% 22% 7% 3	330
	11th to 20th	Day	19% 18% 32% 19% 10% 1	330
	21st to end	Day	23% 14% 34% 22% 7%	330
December	1st to 10th	Day	13% 16% 40% 23% 5% 3	330
	11th to 20th	Day	21% 17% 38% 18% 6% 1	330
	21st to end	Day	22% 21% 37% 19% 1	363
January	1st to 10th	Night	16% 12% 40% 26% 5%	1050
	11th to 20th	Night	16% 14% 41% 24% 5% 1	1050
	21st to end	Night	14% 15% 40% 27% 3	1155
February	1st to 10th	Night	17% 13% 40% 26% 4	1050
	11th to 20th	Night	19% 14% 37% 26% 3	1029
	21st to end	Night	18% 16% 42% 20% 4	647
March	1st to 10th	Night	18% 13% 41% 24% 4	630
	11th to 20th	Night	21% 11% 36% 25% 6%	630
	21st to end	Night	26% 11% 39% 22% 3	693
April	1st to 10th	Night	17% 13% 37% 27% 5%	630
	11th to 20th	Night	19% 14% 33% 28% 6%	623
	21st to end	Night	21% 9% 38% 26% 6%	630
May	1st to 10th	Night	17% 8% 35% 31% 8%	630
	11th to 20th	Night	16% 8% 27% 34% 13% 1	621
	21st to end	Night	15% 6% 26% 34% 17% 2	683
June	1st to 10th	Night	8% 4 19% 43% 24% 2	630
	11th to 20th	Night	7% 3 23% 44% 22% 1	630
	21st to end	Night	5% 3 28% 48% 15% 1	630
July	1st to 10th	Night	9% 2 11% 42% 32% 4	615
	11th to 20th	Night	4 2 15% 43% 33% 4	612
	21st to end	Night	8% 2 13% 40% 36% 2	690
August	1st to 10th	Night	5% 2 14% 46% 33% 1	627
	11th to 20th	Night	7% 3 12% 43% 31% 4	624
	21st to end	Night	5% 2 11% 41% 37% 3	693
September	1st to 10th	Night	12% 3 17% 39% 27% 3	630
	11th to 20th	Night	10% 3 19% 37% 26% 6%	630
	21st to end	Night	8% 5% 23% 39% 22% 3	629
October	1st to 10th	Night	12% 3 27% 38% 18% 2	800
	11th to 20th	Night	15% 8% 37% 31% 9%	800
	21st to end	Night	21% 11% 33% 25% 9%	880
November	1st to 10th	Night	14% 10% 35% 30% 11% 1	820
	11th to 20th	Night	13% 12% 38% 27% 9%	1019
	21st to end	Night	21% 11% 36% 27% 5%	1050
December	1st to 10th	Night	17% 11% 36% 30% 5% 1	1050
	11th to 20th	Night	19% 11% 36% 29% 4	1050
	21st to end	Night	20% 14% 35% 27% 4	1155

Page generated at 2026-09-26 03:18:41. Version ac07

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