Kennard Dale High School
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kennard Dale High School clear sky chart from 2005-11-06 to 2024-11-05.

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	15% 6% 2 6% 4 4 5% 4 6% 7% 40%	101299
	Night	16% 7% 2 6% 4 4 4 3 5% 7% 42%	97704
Transparency	Day	40% 6% 12% 23% 16% 3	104933
	Night	40% 5% 12% 24% 16% 3	102210
Seeing	Day	21% 15% 29% 22% 11% 3	14961
	Night	19% 14% 29% 26% 11% 1	24335

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% 7% 1 5% 4 4 4 3 6% 5% 46%	2517
	11th to 20th	Day	14% 10% 3 9% 6% 5% 4 3 4 5% 36%	2752
	21st to end	Day	18% 9% 3 7% 5% 5% 4 4 5% 5% 35%	3124
February	1st to 10th	Day	14% 9% 2 7% 5% 4 4 4 6% 8% 38%	1710
	11th to 20th	Day	16% 8% 3 6% 5% 4 4 3 6% 6% 40%	1743
	21st to end	Day	18% 10% 3 7% 5% 3 4 2 4 5% 39%	1570
March	1st to 10th	Day	23% 6% 2 5% 4 4 4 3 4 6% 39%	3273
	11th to 20th	Day	9% 5% 2 7% 5% 4 5% 4 6% 7% 46%	3480
	21st to end	Day	20% 8% 2 6% 4 3 3 3 4 5% 42%	3941
April	1st to 10th	Day	15% 7% 2 6% 5% 4 4 4 6% 8% 38%	2280
	11th to 20th	Day	14% 6% 2 6% 4 4 5% 4 5% 7% 44%	2254
	21st to end	Day	18% 6% 2 5% 4 4 4 3 6% 7% 41%	2280
May	1st to 10th	Day	28% 7% 2 5% 4 4 4 3 5% 7% 29%	4018
	11th to 20th	Day	24% 8% 3 7% 5% 5% 5% 4 5% 7% 28%	4398
	21st to end	Day	12% 5% 2 5% 4 4 4 5% 7% 10% 43%	4823
June	1st to 10th	Day	13% 5% 2 7% 4 5% 5% 5% 7% 10% 37%	2660
	11th to 20th	Day	12% 5% 2 7% 5% 5% 6% 4 7% 9% 38%	2660
	21st to end	Day	10% 4 2 6% 5% 5% 5% 4 7% 11% 42%	2660
July	1st to 10th	Day	6% 5% 2 6% 4 6% 7% 5% 9% 11% 39%	4440
	11th to 20th	Day	9% 5% 2 6% 5% 5% 5% 6% 8% 10% 38%	4440
	21st to end	Day	10% 8% 3 8% 6% 6% 5% 4 8% 8% 34%	4531
August	1st to 10th	Day	18% 5% 2 7% 5% 6% 5% 5% 6% 8% 33%	4104
	11th to 20th	Day	12% 5% 2 6% 4 4 6% 4 7% 9% 39%	3830
	21st to end	Day	11% 5% 2 5% 4 4 4 4 6% 8% 46%	4180
September	1st to 10th	Day	15% 6% 2 5% 4 4 5% 3 5% 5% 45%	2280
	11th to 20th	Day	13% 5% 1 4 5% 4 4 3 5% 8% 49%	2280
	21st to end	Day	21% 7% 3 5% 4 4 4 4 4 7% 37%	2024
October	1st to 10th	Day	18% 7% 2 5% 4 3 4 3 4 7% 44%	1900
	11th to 20th	Day	16% 5% 1 5% 3 3 3 4 5% 6% 47%	1900
	21st to end	Day	15% 7% 2 5% 4 3 4 3 5% 6% 46%	2090
November	1st to 10th	Day	13% 6% 2 5% 4 3 3 3 4 7% 52%	1725
	11th to 20th	Day	16% 5% 2 5% 3 4 3 4 5% 6% 48%	1710
	21st to end	Day	15% 7% 2 5% 4 4 4 3 4 7% 45%	1520
December	1st to 10th	Day	17% 8% 3 6% 4 4 5% 3 5% 7% 38%	1520
	11th to 20th	Day	18% 8% 2 6% 3 4 4 3 5% 7% 40%	1910
	21st to end	Day	15% 8% 3 7% 6% 5% 5% 4 5% 6% 36%	2772
January	1st to 10th	Night	15% 7% 3 6% 4 4 4 3 5% 7% 41%	4429
	11th to 20th	Night	18% 9% 2 6% 3 3 3 3 5% 6% 43%	4206
	21st to end	Night	21% 9% 2 6% 4 3 3 3 5% 6% 39%	4532
February	1st to 10th	Night	16% 9% 2 7% 4 4 3 3 5% 6% 40%	2470
	11th to 20th	Night	17% 8% 3 6% 4 4 4 3 4 6% 42%	2321
	21st to end	Night	16% 8% 3 6% 5% 4 4 3 4 6% 41%	1884
March	1st to 10th	Night	20% 8% 3 6% 4 3 3 3 4 5% 39%	3577
	11th to 20th	Night	10% 6% 2 5% 4 4 4 4 5% 6% 51%	3480
	21st to end	Night	15% 9% 3 6% 3 3 3 2 3 5% 47%	3690
April	1st to 10th	Night	16% 7% 2 8% 4 4 4 3 5% 8% 39%	1900
	11th to 20th	Night	14% 6% 2 5% 5% 3 4 4 5% 8% 43%	1875
	21st to end	Night	19% 7% 2 5% 4 2 4 4 5% 6% 43%	1900
May	1st to 10th	Night	25% 8% 3 6% 4 3 4 3 5% 8% 31%	2902
	11th to 20th	Night	24% 12% 4 7% 5% 3 4 3 5% 6% 27%	2495
	21st to end	Night	12% 6% 2 4 3 3 5% 4 7% 11% 42%	2732
June	1st to 10th	Night	12% 5% 2 5% 5% 4 3 3 6% 9% 45%	1520
	11th to 20th	Night	11% 6% 2 6% 5% 5% 5% 4 7% 10% 40%	1520
	21st to end	Night	10% 4 1 5% 4 5% 5% 5% 7% 10% 43%	1520
July	1st to 10th	Night	6% 6% 2 8% 5% 6% 6% 4 8% 9% 40%	2520
	11th to 20th	Night	9% 5% 3 7% 5% 5% 5% 5% 7% 11% 38%	2520
	21st to end	Night	13% 7% 3 7% 4 5% 4 4 6% 7% 39%	3017
August	1st to 10th	Night	20% 5% 2 6% 4 4 5% 4 5% 10% 35%	2825
	11th to 20th	Night	12% 7% 2 8% 5% 4 5% 4 5% 8% 40%	2966
	21st to end	Night	12% 5% 2 5% 4 3 4 3 5% 8% 48%	3476
September	1st to 10th	Night	14% 7% 3 5% 5% 3 3 3 5% 7% 46%	1900
	11th to 20th	Night	12% 6% 2 6% 2 3 3 2 4 7% 53%	1900
	21st to end	Night	20% 7% 2 6% 4 3 4 3 4 6% 41%	2152
October	1st to 10th	Night	20% 6% 3 5% 3 3 3 3 5% 5% 44%	2280
	11th to 20th	Night	16% 5% 2 4 3 3 3 3 5% 6% 51%	2280
	21st to end	Night	16% 6% 2 4 3 3 4 3 5% 7% 48%	2508
November	1st to 10th	Night	11% 6% 2 4 3 4 3 3 4 6% 53%	2451
	11th to 20th	Night	16% 6% 2 5% 4 3 4 3 4 6% 47%	2470
	21st to end	Night	13% 5% 2 5% 4 4 4 4 5% 7% 47%	2657
December	1st to 10th	Night	17% 8% 3 6% 4 4 4 4 5% 7% 38%	2660
	11th to 20th	Night	17% 6% 2 6% 4 4 4 3 5% 7% 42%	3285
	21st to end	Night	16% 7% 3 7% 5% 4 6% 5% 7% 8% 34%	4884

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	38% 5% 12% 28% 14% 4	2518
	11th to 20th	Day	50% 4 10% 19% 13% 4	2752
	21st to end	Day	51% 4 12% 23% 9% 2	3124
February	1st to 10th	Day	43% 5% 13% 25% 11% 2	1710
	11th to 20th	Day	44% 4 10% 26% 14% 3	1752
	21st to end	Day	48% 3 10% 21% 13% 4	1570
March	1st to 10th	Day	45% 4 11% 26% 12% 3	3273
	11th to 20th	Day	34% 6% 10% 27% 19% 4	3480
	21st to end	Day	46% 3 9% 21% 18% 4	3941
April	1st to 10th	Day	42% 5% 12% 20% 16% 5%	2280
	11th to 20th	Day	39% 6% 12% 21% 17% 5%	2254
	21st to end	Day	41% 5% 11% 21% 18% 4	2280
May	1st to 10th	Day	54% 5% 10% 18% 11% 2	4054
	11th to 20th	Day	53% 8% 14% 17% 7% 2	4402
	21st to end	Day	34% 7% 14% 26% 17% 2	4837
June	1st to 10th	Day	39% 7% 13% 23% 15% 2	2660
	11th to 20th	Day	40% 7% 13% 25% 13% 3	2660
	21st to end	Day	33% 8% 15% 25% 17% 2	2660
July	1st to 10th	Day	34% 11% 17% 20% 13% 4	4370
	11th to 20th	Day	37% 9% 17% 25% 11% 2	4365
	21st to end	Day	44% 8% 12% 19% 16% 1	4386
August	1st to 10th	Day	46% 8% 13% 24% 9%	4091
	11th to 20th	Day	38% 8% 12% 27% 15% 1	3869
	21st to end	Day	33% 6% 12% 28% 18% 2	4180
September	1st to 10th	Day	40% 6% 11% 20% 20% 4	2280
	11th to 20th	Day	34% 5% 10% 26% 21% 4	2280
	21st to end	Day	47% 5% 8% 19% 19% 2	2024
October	1st to 10th	Day	37% 4 7% 19% 28% 5%	3160
	11th to 20th	Day	26% 4 10% 25% 24% 10%	3140
	21st to end	Day	25% 3 11% 30% 28% 4	3428
November	1st to 10th	Day	34% 4 13% 25% 20% 4	1725
	11th to 20th	Day	37% 4 10% 24% 22% 3	1710
	21st to end	Day	40% 3 11% 30% 13% 3	1520
December	1st to 10th	Day	45% 4 14% 23% 12% 1	1520
	11th to 20th	Day	42% 5% 11% 31% 10% 1	1906
	21st to end	Day	47% 5% 15% 21% 12% 1	2772
January	1st to 10th	Night	41% 5% 11% 27% 13% 3	4429
	11th to 20th	Night	42% 5% 10% 26% 14% 2	4206
	21st to end	Night	47% 4 8% 28% 12% 2	4532
February	1st to 10th	Night	44% 4 13% 24% 12% 1	2470
	11th to 20th	Night	44% 4 9% 21% 18% 4	2323
	21st to end	Night	45% 4 10% 20% 15% 5%	1884
March	1st to 10th	Night	47% 4 9% 25% 12% 2	3577
	11th to 20th	Night	33% 6% 10% 32% 16% 3	3480
	21st to end	Night	41% 4 8% 20% 22% 5%	3690
April	1st to 10th	Night	44% 3 10% 20% 18% 4	1900
	11th to 20th	Night	38% 5% 12% 21% 19% 5%	1875
	21st to end	Night	40% 6% 10% 22% 18% 5%	1900
May	1st to 10th	Night	52% 5% 10% 19% 12% 2	2932
	11th to 20th	Night	56% 6% 13% 13% 10% 1	2496
	21st to end	Night	35% 9% 16% 24% 14% 3	2739
June	1st to 10th	Night	37% 6% 12% 25% 18% 2	1520
	11th to 20th	Night	39% 6% 14% 25% 15% 1	1520
	21st to end	Night	34% 7% 13% 27% 15% 3	1520
July	1st to 10th	Night	38% 9% 20% 17% 12% 4	2480
	11th to 20th	Night	37% 9% 18% 23% 12% 1	2472
	21st to end	Night	42% 8% 13% 20% 16% 1	2921
August	1st to 10th	Night	45% 7% 18% 21% 9% 1	2814
	11th to 20th	Night	42% 5% 11% 27% 14% 1	2993
	21st to end	Night	34% 5% 11% 31% 17% 2	3476
September	1st to 10th	Night	38% 5% 11% 20% 21% 5%	1900
	11th to 20th	Night	32% 4 10% 25% 25% 4	1900
	21st to end	Night	45% 4 9% 20% 20% 3	2152
October	1st to 10th	Night	42% 5% 10% 19% 21% 2	3800
	11th to 20th	Night	24% 3 11% 26% 29% 6%	3779
	21st to end	Night	25% 3 11% 32% 24% 5%	4120
November	1st to 10th	Night	33% 4 10% 26% 21% 5%	2451
	11th to 20th	Night	39% 3 9% 23% 20% 5%	2470
	21st to end	Night	37% 4 11% 27% 18% 2	2657
December	1st to 10th	Night	46% 4 12% 23% 14% 1	2660
	11th to 20th	Night	41% 5% 11% 22% 17% 3	3288
	21st to end	Night	44% 7% 15% 22% 10% 1	4884

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	30% 27% 27% 13% 2 1	180
	11th to 20th	Day	36% 24% 26% 13% 1	247
	21st to end	Day	24% 33% 30% 10% 3	297
February	1st to 10th	Day	26% 27% 35% 9% 2 1	270
	11th to 20th	Day	35% 25% 35% 5% 1	350
	21st to end	Day	36% 22% 27% 13% 2	382
March	1st to 10th	Day	27% 24% 30% 16% 3	460
	11th to 20th	Day	28% 24% 32% 12% 3 1	460
	21st to end	Day	26% 24% 31% 14% 4 1	506
April	1st to 10th	Day	24% 25% 35% 11% 5% 1	460
	11th to 20th	Day	22% 21% 30% 17% 7% 2	452
	21st to end	Day	28% 18% 33% 14% 5% 2	460
May	1st to 10th	Day	29% 17% 29% 15% 8% 2	463
	11th to 20th	Day	24% 15% 31% 21% 7% 2	487
	21st to end	Day	19% 8% 26% 27% 17% 4	529
June	1st to 10th	Day	16% 12% 31% 26% 12% 4	490
	11th to 20th	Day	17% 10% 28% 29% 13% 3	490
	21st to end	Day	13% 9% 33% 29% 11% 4	490
July	1st to 10th	Day	12% 5% 21% 33% 22% 7%	485
	11th to 20th	Day	6% 4 25% 36% 22% 6%	484
	21st to end	Day	13% 7% 27% 31% 18% 4	532
August	1st to 10th	Day	12% 5% 26% 31% 19% 7%	486
	11th to 20th	Day	10% 7% 20% 35% 19% 9%	479
	21st to end	Day	11% 5% 25% 32% 18% 9%	539
September	1st to 10th	Day	19% 7% 21% 26% 19% 8%	490
	11th to 20th	Day	15% 7% 24% 28% 17% 9%	490
	21st to end	Day	30% 10% 23% 23% 11% 3	490
October	1st to 10th	Day	24% 9% 24% 23% 13% 7%	490
	11th to 20th	Day	20% 15% 28% 23% 12% 2	490
	21st to end	Day	17% 18% 36% 18% 9% 2	539
November	1st to 10th	Day	19% 14% 32% 22% 11% 2	386
	11th to 20th	Day	20% 21% 32% 19% 7% 1	370
	21st to end	Day	27% 19% 32% 17% 4 1	180
December	1st to 10th	Day	26% 24% 33% 12% 3 1	180
	11th to 20th	Day	29% 26% 29% 12% 3	180
	21st to end	Day	26% 19% 33% 15% 7%	198
January	1st to 10th	Night	22% 20% 38% 17% 3	760
	11th to 20th	Night	26% 18% 32% 21% 3	760
	21st to end	Night	20% 23% 38% 19% 1	836
February	1st to 10th	Night	23% 19% 34% 21% 3	760
	11th to 20th	Night	26% 24% 34% 14% 1	743
	21st to end	Night	24% 24% 33% 16% 3	628
March	1st to 10th	Night	22% 22% 35% 17% 4	760
	11th to 20th	Night	23% 23% 32% 17% 5%	760
	21st to end	Night	22% 18% 38% 17% 4	836
April	1st to 10th	Night	22% 22% 35% 18% 3	760
	11th to 20th	Night	19% 16% 35% 24% 6%	751
	21st to end	Night	24% 15% 31% 24% 7%	760
May	1st to 10th	Night	23% 11% 30% 28% 7% 1	636
	11th to 20th	Night	22% 11% 30% 28% 9%	374
	21st to end	Night	18% 5% 22% 37% 16% 1	411
June	1st to 10th	Night	14% 3 27% 40% 16% 1	380
	11th to 20th	Night	12% 5% 27% 41% 15% 1	380
	21st to end	Night	11% 3 27% 43% 16%	380
July	1st to 10th	Night	10% 4 19% 39% 25% 3	370
	11th to 20th	Night	7% 3 19% 40% 28% 4	368
	21st to end	Night	8% 3 20% 45% 21% 3	580
August	1st to 10th	Night	13% 2 15% 42% 25% 2	567
	11th to 20th	Night	15% 4 16% 36% 27% 2	667
	21st to end	Night	14% 3 16% 39% 24% 4	836
September	1st to 10th	Night	16% 5% 22% 33% 21% 3	760
	11th to 20th	Night	15% 4 18% 34% 25% 5%	760
	21st to end	Night	23% 6% 23% 30% 18% 2	760
October	1st to 10th	Night	24% 8% 22% 25% 17% 5%	760
	11th to 20th	Night	19% 12% 27% 30% 13% 1	760
	21st to end	Night	20% 13% 31% 24% 12%	836
November	1st to 10th	Night	15% 13% 33% 28% 10% 1	760
	11th to 20th	Night	20% 19% 30% 23% 7% 1	760
	21st to end	Night	17% 19% 32% 25% 7%	760
December	1st to 10th	Night	24% 19% 33% 17% 7%	760
	11th to 20th	Night	19% 18% 38% 20% 4	760
	21st to end	Night	21% 19% 32% 25% 3	836

Page generated at 2024-11-03 02:11:25. Version ac07

Copyright © 2024 Attilla Danko.