John Paul II Catholic High School
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the John Paul II Catholic 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	14% 6% 2 5% 4 4 4 4 5% 7% 45%	101009
	Night	15% 6% 2 4 3 3 3 3 5% 7% 49%	98147
Transparency	Day	37% 5% 10% 21% 18% 9%	104840
	Night	34% 5% 11% 20% 19% 11%	102443
Seeing	Day	14% 7% 21% 29% 22% 6%	14774
	Night	17% 6% 24% 35% 17% 1	24684

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% 8% 2 4 3 3 3 2 4 5% 50%	2847
	11th to 20th	Day	18% 5% 1 3 2 2 2 2 4 5% 55%	2850
	21st to end	Day	21% 7% 2 4 3 3 3 3 5% 8% 42%	3398
February	1st to 10th	Day	21% 7% 2 5% 3 2 3 3 3 5% 45%	1900
	11th to 20th	Day	20% 8% 2 5% 3 4 2 3 4 6% 44%	1849
	21st to end	Day	19% 6% 2 4 3 2 3 3 4 5% 47%	1570
March	1st to 10th	Day	18% 8% 2 7% 4 4 4 3 4 5% 42%	3397
	11th to 20th	Day	24% 9% 3 8% 6% 4 4 3 3 4 32%	3480
	21st to end	Day	20% 6% 2 4 3 3 3 3 4 7% 45%	3814
April	1st to 10th	Day	16% 8% 2 7% 5% 3 3 3 5% 5% 43%	2090
	11th to 20th	Day	22% 7% 3 5% 3 3 3 2 5% 5% 42%	2066
	21st to end	Day	17% 8% 2 5% 5% 3 3 3 4 5% 43%	2399
May	1st to 10th	Day	26% 9% 2 7% 4 4 3 3 5% 5% 31%	4082
	11th to 20th	Day	15% 7% 2 6% 5% 4 4 3 6% 7% 42%	4082
	21st to end	Day	13% 5% 2 6% 4 5% 5% 4 7% 10% 38%	4477
June	1st to 10th	Day	7% 5% 2 5% 4 5% 5% 5% 7% 9% 47%	2470
	11th to 20th	Day	8% 6% 2 6% 5% 6% 5% 4 6% 9% 43%	2470
	21st to end	Day	8% 8% 2 7% 6% 6% 6% 5% 7% 10% 36%	2470
July	1st to 10th	Day	7% 5% 2 6% 5% 5% 4 4 6% 8% 46%	4120
	11th to 20th	Day	6% 5% 2 6% 5% 5% 6% 5% 7% 11% 43%	4120
	21st to end	Day	9% 7% 2 6% 5% 6% 6% 6% 7% 10% 35%	4465
August	1st to 10th	Day	1 2 1 2 3 3 3 3 6% 9% 66%	4043
	11th to 20th	Day	4 2 1 4 3 3 4 4 8% 12% 55%	3726
	21st to end	Day	5% 3 2 5% 5% 6% 5% 4 8% 11% 45%	3998
September	1st to 10th	Day	10% 6% 3 7% 5% 5% 6% 4 6% 7% 41%	2090
	11th to 20th	Day	11% 6% 2 7% 4 5% 5% 5% 7% 8% 39%	2090
	21st to end	Day	9% 5% 2 6% 4 4 4 4 6% 7% 50%	2090
October	1st to 10th	Day	6% 5% 1 5% 4 4 4 3 5% 7% 54%	2090
	11th to 20th	Day	13% 5% 2 5% 4 4 4 4 4 5% 51%	1976
	21st to end	Day	12% 5% 1 5% 3 2 3 3 3 5% 57%	2090
November	1st to 10th	Day	16% 8% 3 5% 4 4 3 4 5% 6% 42%	1898
	11th to 20th	Day	14% 6% 2 5% 4 3 4 4 5% 5% 48%	1786
	21st to end	Day	19% 7% 3 6% 4 3 3 2 4 5% 43%	1710
December	1st to 10th	Day	18% 7% 1 4 3 4 3 3 5% 6% 45%	1710
	11th to 20th	Day	19% 7% 3 5% 4 4 4 3 4 5% 43%	2161
	21st to end	Day	18% 6% 2 4 3 2 2 2 3 4 53%	3135
January	1st to 10th	Night	20% 6% 1 3 3 2 2 2 4 5% 51%	4108
	11th to 20th	Night	15% 4 1 3 2 2 2 1 3 4 65%	4120
	21st to end	Night	24% 6% 2 6% 3 2 2 3 4 6% 42%	4298
February	1st to 10th	Night	21% 7% 1 4 3 3 3 3 4 5% 46%	2280
	11th to 20th	Night	21% 7% 2 3 2 3 2 2 3 5% 48%	2218
	21st to end	Night	22% 6% 2 4 3 3 3 3 4 5% 45%	1884
March	1st to 10th	Night	22% 8% 2 5% 4 4 4 3 4 4 39%	3458
	11th to 20th	Night	25% 9% 3 7% 4 4 4 3 4 5% 32%	3480
	21st to end	Night	20% 7% 2 5% 4 3 3 3 4 5% 45%	3817
April	1st to 10th	Night	15% 7% 2 5% 5% 3 3 3 5% 7% 46%	2090
	11th to 20th	Night	22% 6% 2 5% 4 3 3 3 4 6% 44%	2063
	21st to end	Night	22% 5% 2 5% 4 3 3 2 4 5% 45%	1773
May	1st to 10th	Night	28% 8% 2 5% 3 3 3 3 5% 4 36%	2823
	11th to 20th	Night	16% 5% 2 5% 3 3 4 3 5% 7% 48%	2823
	21st to end	Night	17% 6% 2 4 3 3 4 3 7% 8% 43%	3090
June	1st to 10th	Night	7% 4 1 4 3 3 4 2 6% 8% 58%	1710
	11th to 20th	Night	6% 4 1 3 4 3 4 4 5% 9% 56%	1710
	21st to end	Night	8% 5% 2 5% 3 4 4 4 6% 9% 48%	1710
July	1st to 10th	Night	6% 4 2 4 3 4 4 4 6% 11% 52%	2850
	11th to 20th	Night	4 4 2 5% 5% 4 5% 4 8% 10% 49%	2850
	21st to end	Night	12% 7% 2 7% 4 4 4 4 6% 9% 40%	3098
August	1st to 10th	Night	1 1 1 2 2 2 3 3 4 8% 73%	2891
	11th to 20th	Night	4 3 1 3 3 3 4 4 8% 12% 56%	3113
	21st to end	Night	6% 3 2 4 3 3 4 4 7% 10% 54%	3660
September	1st to 10th	Night	9% 6% 2 5% 4 5% 4 3 5% 8% 48%	2090
	11th to 20th	Night	10% 6% 2 6% 4 5% 4 3 6% 8% 45%	2090
	21st to end	Night	9% 5% 2 5% 4 3 3 4 6% 8% 51%	2090
October	1st to 10th	Night	7% 4 1 4 3 4 4 3 5% 7% 59%	2090
	11th to 20th	Night	15% 5% 1 4 4 3 3 2 4 5% 54%	2185
	21st to end	Night	15% 4 1 4 2 2 2 2 3 5% 61%	2508
November	1st to 10th	Night	16% 6% 2 5% 3 3 3 2 4 6% 51%	2280
	11th to 20th	Night	13% 5% 2 4 3 3 3 3 5% 5% 53%	2389
	21st to end	Night	20% 5% 2 5% 3 3 3 3 4 5% 46%	2470
December	1st to 10th	Night	17% 7% 2 4 3 2 3 3 4 6% 49%	2470
	11th to 20th	Night	20% 7% 2 5% 3 3 3 3 4 5% 46%	3036
	21st to end	Night	21% 6% 1 3 2 2 2 3 3 5% 52%	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	38% 3 4 15% 26% 15%	2848
	11th to 20th	Day	34% 2 6% 17% 24% 18%	2850
	21st to end	Day	42% 3 4 12% 29% 9%	3398
February	1st to 10th	Day	43% 4 5% 12% 20% 15%	1900
	11th to 20th	Day	42% 3 7% 16% 19% 13%	1859
	21st to end	Day	40% 4 7% 16% 18% 15%	1570
March	1st to 10th	Day	45% 5% 6% 17% 18% 9%	3397
	11th to 20th	Day	55% 6% 6% 8% 17% 9%	3480
	21st to end	Day	38% 5% 9% 17% 20% 12%	3814
April	1st to 10th	Day	43% 4 7% 16% 17% 12%	2090
	11th to 20th	Day	44% 4 7% 16% 17% 12%	2066
	21st to end	Day	43% 4 7% 19% 17% 10%	2399
May	1st to 10th	Day	53% 6% 9% 14% 13% 5%	4120
	11th to 20th	Day	40% 7% 9% 18% 19% 7%	4086
	21st to end	Day	36% 7% 13% 31% 11% 1	4489
June	1st to 10th	Day	30% 8% 13% 26% 20% 3	2470
	11th to 20th	Day	34% 7% 12% 24% 19% 4	2470
	21st to end	Day	40% 8% 12% 24% 13% 3	2470
July	1st to 10th	Day	35% 5% 16% 36% 7% 1	4056
	11th to 20th	Day	33% 6% 19% 27% 14% 1	4051
	21st to end	Day	40% 6% 18% 27% 8%	4325
August	1st to 10th	Day	15% 5% 11% 44% 24% 1	4029
	11th to 20th	Day	21% 6% 24% 35% 11% 2	3762
	21st to end	Day	31% 7% 19% 24% 17% 2	3997
September	1st to 10th	Day	41% 7% 10% 17% 17% 8%	2090
	11th to 20th	Day	39% 9% 11% 19% 17% 5%	2090
	21st to end	Day	31% 7% 10% 21% 18% 13%	2090
October	1st to 10th	Day	17% 4 6% 12% 24% 36%	3480
	11th to 20th	Day	26% 3 8% 19% 24% 21%	3268
	21st to end	Day	28% 4 5% 19% 29% 16%	3428
November	1st to 10th	Day	43% 4 7% 18% 17% 11%	1898
	11th to 20th	Day	37% 4 9% 16% 20% 13%	1786
	21st to end	Day	44% 4 6% 14% 19% 13%	1710
December	1st to 10th	Day	41% 4 7% 20% 19% 8%	1710
	11th to 20th	Day	43% 5% 6% 10% 21% 14%	2159
	21st to end	Day	36% 3 5% 17% 25% 13%	3135
January	1st to 10th	Night	36% 3 5% 14% 21% 20%	4108
	11th to 20th	Night	27% 2 4 17% 29% 20%	4120
	21st to end	Night	45% 3 4 12% 25% 11%	4298
February	1st to 10th	Night	41% 4 6% 12% 19% 18%	2280
	11th to 20th	Night	41% 2 6% 16% 19% 15%	2218
	21st to end	Night	41% 5% 5% 17% 18% 15%	1884
March	1st to 10th	Night	47% 4 7% 16% 16% 9%	3458
	11th to 20th	Night	53% 6% 8% 11% 12% 10%	3480
	21st to end	Night	41% 5% 9% 14% 20% 10%	3817
April	1st to 10th	Night	37% 5% 10% 18% 16% 14%	2090
	11th to 20th	Night	42% 5% 9% 12% 16% 16%	2063
	21st to end	Night	42% 4 9% 19% 16% 10%	1773
May	1st to 10th	Night	49% 5% 10% 16% 14% 6%	2850
	11th to 20th	Night	36% 6% 11% 21% 19% 7%	2824
	21st to end	Night	36% 7% 15% 30% 12% 1	3099
June	1st to 10th	Night	24% 6% 16% 30% 22% 2	1710
	11th to 20th	Night	22% 7% 15% 31% 20% 5%	1710
	21st to end	Night	30% 8% 17% 28% 14% 3	1710
July	1st to 10th	Night	26% 7% 24% 37% 5% 1	2805
	11th to 20th	Night	28% 8% 21% 28% 14% 1	2796
	21st to end	Night	38% 6% 24% 25% 7%	2999
August	1st to 10th	Night	11% 4 17% 47% 20%	2881
	11th to 20th	Night	20% 6% 32% 33% 7% 1	3143
	21st to end	Night	24% 11% 23% 27% 14% 2	3660
September	1st to 10th	Night	33% 7% 16% 21% 15% 7%	2090
	11th to 20th	Night	35% 8% 15% 22% 15% 5%	2090
	21st to end	Night	29% 7% 16% 20% 17% 12%	2090
October	1st to 10th	Night	17% 4 7% 15% 20% 37%	3480
	11th to 20th	Night	22% 3 9% 17% 29% 20%	3619
	21st to end	Night	26% 3 7% 19% 29% 16%	4120
November	1st to 10th	Night	36% 4 8% 18% 20% 13%	2280
	11th to 20th	Night	33% 5% 10% 17% 20% 15%	2389
	21st to end	Night	41% 3 7% 17% 19% 13%	2470
December	1st to 10th	Night	37% 4 7% 20% 20% 12%	2470
	11th to 20th	Night	43% 3 5% 11% 19% 18%	3037
	21st to end	Night	36% 4 5% 14% 28% 13%	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	23% 12% 38% 21% 4 1	270
	11th to 20th	Day	25% 16% 26% 24% 7% 1	270
	21st to end	Day	19% 15% 33% 25% 7%	297
February	1st to 10th	Day	32% 14% 28% 17% 9%	270
	11th to 20th	Day	29% 17% 31% 18% 5% 1	270
	21st to end	Day	25% 20% 40% 14% 1	225
March	1st to 10th	Day	24% 15% 41% 17% 3	270
	11th to 20th	Day	17% 21% 39% 18% 5%	270
	21st to end	Day	22% 18% 35% 21% 5%	297
April	1st to 10th	Day	21% 17% 37% 23% 3	270
	11th to 20th	Day	21% 14% 37% 22% 6%	264
	21st to end	Day	18% 11% 39% 27% 6%	579
May	1st to 10th	Day	19% 12% 35% 26% 7%	653
	11th to 20th	Day	17% 10% 28% 34% 10% 1	675
	21st to end	Day	17% 6% 24% 37% 15% 1	734
June	1st to 10th	Day	8% 3 17% 40% 27% 5%	680
	11th to 20th	Day	9% 1 14% 45% 27% 3	680
	21st to end	Day	10% 1 13% 36% 30% 10%	680
July	1st to 10th	Day	9% 2 9% 33% 37% 11%	671
	11th to 20th	Day	5% 1 7% 29% 48% 10%	668
	21st to end	Day	6% 1 5% 33% 44% 11%	739
August	1st to 10th	Day	3 1 5% 30% 45% 16%	641
	11th to 20th	Day	6% 3 38% 40% 13%	477
	21st to end	Day	4 1 7% 23% 44% 20%	435
September	1st to 10th	Day	10% 1 8% 26% 39% 15%	300
	11th to 20th	Day	8% 1 5% 25% 44% 17%	300
	21st to end	Day	10% 1 11% 24% 37% 17%	300
October	1st to 10th	Day	6% 2 14% 33% 34% 10%	300
	11th to 20th	Day	11% 5% 19% 36% 24% 4	300
	21st to end	Day	18% 12% 23% 22% 18% 6%	330
November	1st to 10th	Day	20% 11% 22% 30% 13% 4	282
	11th to 20th	Day	20% 10% 27% 27% 13% 3	270
	21st to end	Day	26% 16% 29% 18% 10% 2	270
December	1st to 10th	Day	20% 9% 32% 28% 8% 4	270
	11th to 20th	Day	22% 17% 28% 26% 8%	270
	21st to end	Day	23% 8% 39% 23% 5% 1	297
January	1st to 10th	Night	21% 7% 28% 33% 9%	950
	11th to 20th	Night	22% 9% 31% 30% 8%	950
	21st to end	Night	24% 9% 26% 33% 8%	902
February	1st to 10th	Night	26% 10% 29% 28% 6%	760
	11th to 20th	Night	26% 13% 31% 25% 4	744
	21st to end	Night	25% 13% 37% 23% 2	628
March	1st to 10th	Night	24% 12% 34% 27% 3	598
	11th to 20th	Night	22% 10% 35% 28% 5%	570
	21st to end	Night	20% 10% 40% 26% 4	627
April	1st to 10th	Night	16% 10% 41% 29% 3	570
	11th to 20th	Night	23% 12% 35% 26% 5%	563
	21st to end	Night	22% 9% 37% 25% 7% 1	570
May	1st to 10th	Night	20% 8% 38% 29% 4	570
	11th to 20th	Night	17% 6% 35% 35% 8%	561
	21st to end	Night	15% 6% 33% 35% 11%	617
June	1st to 10th	Night	7% 2 22% 46% 21% 1	570
	11th to 20th	Night	6% 2 30% 46% 16% 1	570
	21st to end	Night	8% 1 18% 43% 27% 2	570
July	1st to 10th	Night	8% 2 12% 46% 28% 4	555
	11th to 20th	Night	4 1 11% 48% 33% 3	552
	21st to end	Night	7% 1 9% 47% 33% 3	624
August	1st to 10th	Night	1 1 7% 50% 36% 5%	567
	11th to 20th	Night	4 1 8% 49% 35% 3	564
	21st to end	Night	7% 1 6% 38% 44% 4	627
September	1st to 10th	Night	11% 1 8% 38% 38% 4	570
	11th to 20th	Night	12% 1 8% 36% 40% 3	570
	21st to end	Night	9% 2 14% 33% 39% 4	570
October	1st to 10th	Night	7% 2 10% 46% 30% 4	570
	11th to 20th	Night	15% 2 19% 40% 21% 2	665
	21st to end	Night	16% 6% 21% 35% 19% 3	836
November	1st to 10th	Night	16% 6% 18% 37% 21% 1	760
	11th to 20th	Night	15% 6% 23% 38% 16% 2	869
	21st to end	Night	21% 9% 25% 31% 13% 1	950
December	1st to 10th	Night	21% 8% 24% 33% 13% 1	950
	11th to 20th	Night	27% 8% 25% 31% 9%	950
	21st to end	Night	22% 7% 28% 34% 9%	1045

Page generated at 2024-11-03 01:11:27. Version ac07

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