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 2025-05-26.

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% 3 6% 4 4 4 3 5% 7% 45%	114097
	Night	11% 7% 3 6% 4 4 4 3 5% 6% 48%	115371
Transparency	Day	37% 5% 12% 26% 17% 3	117750
	Night	36% 4 11% 26% 19% 4	119860
Seeing	Day	15% 10% 28% 27% 16% 4	16343
	Night	15% 9% 31% 32% 13% 1	26295

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	16% 9% 3 9% 4 5% 4 3 4 5% 37%	4077
	11th to 20th	Day	8% 8% 3 9% 6% 7% 6% 3 4 4 41%	4080
	21st to end	Day	13% 14% 4 7% 4 4 4 3 4 5% 38%	4488
February	1st to 10th	Day	15% 11% 5% 7% 4 4 4 3 4 6% 37%	1800
	11th to 20th	Day	13% 11% 3 7% 5% 5% 4 3 4 6% 40%	1754
	21st to end	Day	11% 9% 3 7% 5% 3 3 3 6% 7% 44%	1709
March	1st to 10th	Day	13% 9% 3 6% 3 3 3 2 3 5% 50%	4936
	11th to 20th	Day	10% 6% 2 5% 3 3 3 3 5% 6% 55%	4980
	21st to end	Day	13% 10% 4 8% 5% 4 4 4 6% 7% 35%	5462
April	1st to 10th	Day	14% 8% 2 6% 4 3 4 3 5% 6% 44%	2320
	11th to 20th	Day	15% 9% 2 6% 4 4 4 3 5% 6% 40%	2374
	21st to end	Day	19% 9% 3 8% 5% 4 5% 3 4 6% 35%	2514
May	1st to 10th	Day	15% 8% 3 7% 5% 4 4 3 5% 7% 38%	4212
	11th to 20th	Day	15% 7% 2 7% 4 4 4 4 5% 7% 39%	4212
	21st to end	Day	12% 6% 2 6% 4 5% 5% 3 5% 8% 44%	4663
June	1st to 10th	Day	7% 4 1 5% 4 4 5% 5% 7% 10% 48%	2660
	11th to 20th	Day	6% 5% 2 6% 5% 5% 5% 4 7% 8% 47%	2660
	21st to end	Day	6% 4 2 5% 4 4 4 4 7% 8% 51%	2660
July	1st to 10th	Day	12% 6% 3 7% 4 4 4 4 5% 9% 42%	4122
	11th to 20th	Day	4 4 1 5% 3 4 5% 5% 6% 10% 53%	4120
	21st to end	Day	6% 4 2 5% 5% 5% 6% 6% 8% 10% 44%	4465
August	1st to 10th	Day	5% 3 2 5% 3 4 5% 4 6% 9% 54%	4104
	11th to 20th	Day	11% 5% 2 6% 4 3 4 3 6% 8% 47%	4041
	21st to end	Day	5% 4 1 5% 3 4 4 3 6% 9% 57%	4244
September	1st to 10th	Day	11% 6% 2 4 3 3 3 4 4 7% 53%	2280
	11th to 20th	Day	9% 5% 1 5% 5% 4 4 4 6% 7% 50%	2124
	21st to end	Day	9% 5% 2 5% 4 4 5% 3 4 7% 54%	2066
October	1st to 10th	Day	11% 6% 2 4 3 3 3 3 6% 7% 53%	1900
	11th to 20th	Day	12% 6% 2 5% 2 2 3 3 4 6% 56%	1900
	21st to end	Day	15% 7% 3 6% 4 3 3 2 4 6% 47%	2090
November	1st to 10th	Day	10% 6% 2 6% 3 3 3 3 4 5% 54%	1958
	11th to 20th	Day	15% 6% 2 5% 2 2 3 3 4 6% 51%	1738
	21st to end	Day	15% 8% 3 6% 3 3 3 3 4 4 49%	1600
December	1st to 10th	Day	6% 6% 2 6% 5% 3 3 3 5% 7% 54%	2610
	11th to 20th	Day	10% 7% 3 7% 4 4 4 3 4 6% 49%	3008
	21st to end	Day	18% 16% 7% 10% 4 3 4 3 3 5% 26%	4166
January	1st to 10th	Night	13% 10% 4 13% 5% 5% 4 2 3 5% 37%	5888
	11th to 20th	Night	9% 9% 3 9% 5% 6% 5% 3 3 4 43%	5900
	21st to end	Night	15% 9% 4 9% 4 3 4 3 4 5% 42%	6490
February	1st to 10th	Night	13% 10% 3 8% 5% 4 4 3 5% 6% 39%	2600
	11th to 20th	Night	12% 9% 3 7% 4 4 4 3 5% 6% 42%	2533
	21st to end	Night	12% 8% 2 7% 4 4 4 3 5% 6% 47%	1938
March	1st to 10th	Night	13% 9% 3 5% 3 3 3 3 4 5% 49%	4919
	11th to 20th	Night	8% 7% 2 4 3 3 3 3 6% 7% 56%	4980
	21st to end	Night	13% 9% 3 8% 5% 4 4 3 5% 7% 39%	5467
April	1st to 10th	Night	12% 7% 2 5% 4 3 3 3 5% 7% 49%	2080
	11th to 20th	Night	13% 7% 3 6% 4 3 3 3 5% 6% 47%	1975
	21st to end	Night	17% 6% 3 6% 4 3 4 3 5% 5% 42%	1882
May	1st to 10th	Night	16% 8% 3 4 5% 4 5% 4 4 7% 41%	2913
	11th to 20th	Night	13% 8% 2 6% 4 3 3 3 6% 7% 44%	2913
	21st to end	Night	12% 5% 2 5% 3 3 3 3 5% 6% 52%	3015
June	1st to 10th	Night	6% 3 1 3 3 4 4 4 7% 9% 55%	1520
	11th to 20th	Night	5% 4 2 5% 4 5% 4 4 7% 11% 51%	1520
	21st to end	Night	4 2 1 3 3 3 4 4 5% 8% 61%	1520
July	1st to 10th	Night	11% 6% 2 6% 4 4 4 3 6% 8% 46%	2841
	11th to 20th	Night	3 2 1 4 3 3 4 3 6% 10% 59%	2850
	21st to end	Night	5% 4 2 5% 4 4 5% 5% 9% 10% 48%	3098
August	1st to 10th	Night	2 1 1 3 3 3 5% 4 6% 10% 62%	2836
	11th to 20th	Night	12% 6% 2 5% 3 3 4 3 5% 6% 52%	2798
	21st to end	Night	3 3 2 5% 3 4 4 3 6% 8% 59%	3412
September	1st to 10th	Night	10% 5% 1 5% 3 3 3 3 4 6% 57%	1900
	11th to 20th	Night	9% 5% 2 4 4 3 3 4 6% 6% 54%	2052
	21st to end	Night	7% 4 1 5% 4 4 4 3 4 6% 57%	2095
October	1st to 10th	Night	10% 5% 1 4 3 3 4 3 4 5% 59%	2280
	11th to 20th	Night	12% 5% 2 4 3 3 3 2 3 5% 57%	2280
	21st to end	Night	15% 7% 2 5% 3 3 3 2 4 5% 51%	2508
November	1st to 10th	Night	11% 5% 2 3 3 3 2 2 4 5% 60%	2340
	11th to 20th	Night	10% 6% 2 5% 4 3 3 3 4 7% 53%	2655
	21st to end	Night	14% 7% 2 5% 3 3 3 3 4 5% 51%	2800
December	1st to 10th	Night	8% 5% 2 5% 4 3 4 3 5% 6% 56%	4580
	11th to 20th	Night	12% 8% 3 7% 3 3 4 3 5% 6% 45%	5199
	21st to end	Night	20% 16% 5% 9% 4 4 3 3 3 4 29%	6794

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	49% 3 10% 25% 11% 1	4078
	11th to 20th	Day	46% 3 10% 22% 15% 4	4080
	21st to end	Day	48% 3 11% 16% 18% 4	4488
February	1st to 10th	Day	49% 4 11% 22% 11% 2	1800
	11th to 20th	Day	46% 4 12% 21% 15% 2	1763
	21st to end	Day	40% 3 10% 26% 16% 4	1709
March	1st to 10th	Day	39% 3 7% 22% 23% 7%	4936
	11th to 20th	Day	31% 3 10% 22% 27% 7%	4980
	21st to end	Day	47% 5% 17% 25% 6% 1	5464
April	1st to 10th	Day	41% 5% 12% 24% 16% 2	2320
	11th to 20th	Day	44% 4 12% 23% 15% 1	2374
	21st to end	Day	51% 4 10% 23% 11% 1	2514
May	1st to 10th	Day	46% 6% 11% 23% 14% 1	4250
	11th to 20th	Day	44% 6% 13% 23% 14%	4216
	21st to end	Day	38% 7% 11% 31% 12% 1	4676
June	1st to 10th	Day	30% 6% 18% 30% 15% 2	2660
	11th to 20th	Day	31% 6% 15% 31% 15% 2	2660
	21st to end	Day	28% 6% 16% 30% 16% 4	2660
July	1st to 10th	Day	39% 6% 13% 21% 17% 3	4058
	11th to 20th	Day	26% 7% 14% 35% 17% 2	4051
	21st to end	Day	29% 10% 19% 31% 11% 1	4325
August	1st to 10th	Day	27% 6% 16% 29% 21% 2	4090
	11th to 20th	Day	35% 7% 17% 26% 15% 1	4080
	21st to end	Day	24% 6% 15% 36% 15% 4	4243
September	1st to 10th	Day	31% 5% 12% 26% 20% 6%	2280
	11th to 20th	Day	31% 5% 13% 25% 24% 2	2124
	21st to end	Day	31% 5% 9% 29% 23% 3	2066
October	1st to 10th	Day	18% 2 7% 23% 40% 9%	3160
	11th to 20th	Day	20% 2 5% 25% 40% 8%	3140
	21st to end	Day	33% 3 10% 25% 26% 3	3428
November	1st to 10th	Day	32% 4 11% 29% 19% 5%	1958
	11th to 20th	Day	36% 3 10% 26% 22% 4	1738
	21st to end	Day	40% 3 9% 28% 19% 1	1600
December	1st to 10th	Day	30% 4 13% 36% 17% 1	2610
	11th to 20th	Day	37% 3 12% 33% 13% 1	3005
	21st to end	Day	63% 3 11% 16% 6% 1	4166
January	1st to 10th	Night	51% 4 12% 22% 11% 1	5888
	11th to 20th	Night	46% 3 9% 23% 15% 4	5900
	21st to end	Night	46% 3 10% 19% 17% 5%	6490
February	1st to 10th	Night	45% 4 11% 23% 14% 3	2600
	11th to 20th	Night	43% 4 11% 22% 17% 3	2534
	21st to end	Night	39% 3 8% 24% 20% 6%	1938
March	1st to 10th	Night	38% 3 8% 22% 24% 5%	4919
	11th to 20th	Night	28% 4 7% 23% 31% 7%	4980
	21st to end	Night	44% 5% 16% 24% 10% 2	5467
April	1st to 10th	Night	36% 3 11% 23% 23% 4	2080
	11th to 20th	Night	38% 3 9% 28% 18% 4	1975
	21st to end	Night	43% 4 12% 26% 15% 1	1882
May	1st to 10th	Night	43% 6% 14% 20% 16% 1	2940
	11th to 20th	Night	39% 5% 13% 28% 13% 1	2914
	21st to end	Night	33% 5% 11% 28% 22% 1	3023
June	1st to 10th	Night	24% 6% 18% 31% 17% 3	1520
	11th to 20th	Night	26% 6% 14% 32% 19% 2	1520
	21st to end	Night	20% 5% 14% 33% 23% 5%	1520
July	1st to 10th	Night	36% 5% 13% 24% 18% 4	2796
	11th to 20th	Night	19% 5% 13% 39% 21% 3	2796
	21st to end	Night	26% 8% 21% 31% 13% 1	2999
August	1st to 10th	Night	18% 5% 21% 29% 22% 5%	2826
	11th to 20th	Night	33% 5% 12% 30% 19% 2	2825
	21st to end	Night	23% 5% 13% 37% 17% 4	3412
September	1st to 10th	Night	29% 4 9% 28% 21% 8%	1900
	11th to 20th	Night	28% 5% 10% 28% 24% 5%	2052
	21st to end	Night	28% 4 7% 27% 29% 4	2095
October	1st to 10th	Night	17% 2 6% 22% 43% 10%	3800
	11th to 20th	Night	21% 3 6% 25% 31% 14%	3779
	21st to end	Night	33% 3 7% 30% 25% 3	4120
November	1st to 10th	Night	28% 3 12% 28% 24% 6%	2340
	11th to 20th	Night	33% 3 8% 26% 25% 5%	2655
	21st to end	Night	37% 3 9% 30% 19% 3	2800
December	1st to 10th	Night	29% 4 14% 35% 17% 1	4580
	11th to 20th	Night	39% 3 11% 28% 16% 2	5201
	21st to end	Night	60% 4 9% 19% 7% 1	6794

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	23% 15% 36% 20% 6%	300
	11th to 20th	Day	26% 16% 38% 18% 1	300
	21st to end	Day	17% 14% 45% 19% 5%	330
February	1st to 10th	Day	26% 16% 41% 15% 2	300
	11th to 20th	Day	22% 21% 38% 15% 3 1	300
	21st to end	Day	18% 25% 43% 10% 4	249
March	1st to 10th	Day	20% 19% 40% 17% 4	300
	11th to 20th	Day	29% 14% 33% 19% 4	300
	21st to end	Day	32% 18% 33% 14% 3	330
April	1st to 10th	Day	25% 15% 37% 16% 5% 1	420
	11th to 20th	Day	22% 17% 35% 18% 7% 1	492
	21st to end	Day	24% 15% 33% 20% 8%	614
May	1st to 10th	Day	19% 11% 37% 22% 9% 1	703
	11th to 20th	Day	19% 11% 28% 27% 12% 3	725
	21st to end	Day	19% 8% 28% 26% 14% 5%	760
June	1st to 10th	Day	7% 4 20% 36% 26% 7%	680
	11th to 20th	Day	8% 4 25% 40% 19% 4	680
	21st to end	Day	6% 7% 33% 34% 19% 2	680
July	1st to 10th	Day	13% 3 13% 28% 31% 11%	671
	11th to 20th	Day	4 3 20% 38% 28% 9%	668
	21st to end	Day	8% 2 16% 36% 31% 8%	739
August	1st to 10th	Day	7% 3 15% 39% 31% 5%	676
	11th to 20th	Day	9% 3 18% 33% 31% 6%	665
	21st to end	Day	9% 2 13% 31% 35% 11%	577
September	1st to 10th	Day	13% 3 13% 36% 28% 8%	490
	11th to 20th	Day	6% 3 20% 42% 24% 5%	334
	21st to end	Day	12% 6% 29% 32% 15% 6%	300
October	1st to 10th	Day	15% 7% 29% 26% 16% 7%	300
	11th to 20th	Day	13% 17% 39% 24% 7% 1	300
	21st to end	Day	24% 13% 35% 20% 7%	330
November	1st to 10th	Day	16% 12% 38% 24% 7% 3	300
	11th to 20th	Day	20% 18% 30% 19% 11% 1	300
	21st to end	Day	22% 13% 36% 22% 7%	300
December	1st to 10th	Day	12% 16% 39% 24% 5% 3	300
	11th to 20th	Day	21% 18% 36% 19% 5% 1	300
	21st to end	Day	23% 21% 36% 19% 1	330
January	1st to 10th	Night	16% 12% 40% 26% 6%	1000
	11th to 20th	Night	16% 13% 40% 25% 5% 1	1000
	21st to end	Night	14% 14% 40% 28% 4	1100
February	1st to 10th	Night	18% 14% 39% 25% 4	1000
	11th to 20th	Night	19% 14% 36% 27% 3	979
	21st to end	Night	18% 15% 42% 20% 4	618
March	1st to 10th	Night	17% 12% 42% 25% 4	600
	11th to 20th	Night	21% 11% 36% 26% 6% 1	600
	21st to end	Night	26% 10% 38% 22% 3	660
April	1st to 10th	Night	16% 13% 37% 28% 6%	600
	11th to 20th	Night	19% 14% 32% 29% 7%	593
	21st to end	Night	22% 9% 37% 26% 6%	600
May	1st to 10th	Night	17% 7% 34% 32% 9% 1	600
	11th to 20th	Night	16% 8% 27% 34% 14% 1	591
	21st to end	Night	14% 6% 26% 34% 17% 2	634
June	1st to 10th	Night	8% 3 18% 43% 26% 2	570
	11th to 20th	Night	6% 2 22% 46% 22% 2	570
	21st to end	Night	5% 3 26% 49% 16% 1	570
July	1st to 10th	Night	9% 2 11% 41% 32% 5%	555
	11th to 20th	Night	3 2 15% 44% 32% 3	552
	21st to end	Night	8% 2 12% 40% 37% 2	624
August	1st to 10th	Night	4 2 12% 46% 35% 1	567
	11th to 20th	Night	8% 3 11% 44% 31% 3	564
	21st to end	Night	6% 2 12% 39% 39% 3	627
September	1st to 10th	Night	12% 3 16% 39% 27% 3	570
	11th to 20th	Night	11% 2 19% 37% 25% 6%	570
	21st to end	Night	8% 5% 24% 39% 21% 4	575
October	1st to 10th	Night	12% 3 26% 38% 19% 2	760
	11th to 20th	Night	15% 8% 37% 31% 9%	760
	21st to end	Night	20% 11% 33% 25% 10%	836
November	1st to 10th	Night	14% 9% 34% 31% 11% 1	780
	11th to 20th	Night	14% 12% 38% 27% 9%	970
	21st to end	Night	20% 10% 37% 28% 6%	1000
December	1st to 10th	Night	17% 10% 36% 30% 6% 1	1000
	11th to 20th	Night	20% 10% 36% 30% 5%	1000
	21st to end	Night	21% 14% 35% 26% 4	1100

Page generated at 2025-05-23 08:21:01. Version ac07

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