Peniel Presbyterian Church and nearby Patriot Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Peniel Presbyterian Church and nearby Patriot Observatory clear sky chart from 2005-11-06 to 2026-06-01.

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% 9% 3 8% 5% 5% 5% 4 6% 7% 35%	132341
	Night	14% 10% 4 8% 5% 4 4 4 5% 7% 35%	130813
Transparency	Day	46% 5% 10% 22% 14% 2	136026
	Night	47% 5% 10% 21% 14% 2	135198
Seeing	Day	20% 13% 27% 21% 13% 5%	16972
	Night	19% 11% 25% 28% 15% 2	27081

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% 18% 6% 11% 6% 4 4 3 4 6% 22%	5258
	11th to 20th	Day	12% 16% 7% 14% 6% 4 3 2 3 4 29%	5280
	21st to end	Day	18% 13% 5% 11% 8% 6% 5% 4 5% 5% 21%	5780
February	1st to 10th	Day	20% 13% 5% 9% 4 4 3 3 5% 5% 29%	1890
	11th to 20th	Day	20% 12% 4 10% 5% 5% 3 3 5% 5% 28%	2033
	21st to end	Day	19% 14% 4 7% 4 2 4 3 5% 6% 32%	1730
March	1st to 10th	Day	18% 14% 4 8% 5% 4 4 3 4 6% 31%	4859
	11th to 20th	Day	12% 7% 3 7% 5% 4 4 4 6% 7% 41%	5090
	21st to end	Day	16% 9% 3 7% 5% 4 5% 4 6% 7% 34%	5586
April	1st to 10th	Day	14% 10% 3 7% 4 4 5% 3 6% 7% 37%	2310
	11th to 20th	Day	15% 7% 3 7% 4 4 5% 4 5% 6% 40%	2648
	21st to end	Day	17% 8% 3 7% 5% 4 5% 3 6% 7% 35%	2730
May	1st to 10th	Day	17% 10% 3 8% 5% 5% 7% 5% 7% 7% 27%	5992
	11th to 20th	Day	18% 9% 3 8% 5% 5% 4 4 6% 7% 30%	5991
	21st to end	Day	14% 7% 3 7% 5% 5% 6% 4 6% 9% 34%	6576
June	1st to 10th	Day	11% 6% 2 6% 5% 4 6% 5% 7% 9% 39%	2600
	11th to 20th	Day	8% 6% 2 7% 5% 6% 6% 5% 8% 9% 39%	2600
	21st to end	Day	10% 5% 2 5% 5% 5% 6% 6% 6% 11% 40%	2600
July	1st to 10th	Day	8% 6% 3 7% 5% 5% 5% 4 6% 9% 43%	5900
	11th to 20th	Day	9% 7% 2 8% 6% 6% 7% 5% 8% 10% 33%	5900
	21st to end	Day	11% 8% 3 8% 6% 6% 6% 5% 7% 10% 31%	6424
August	1st to 10th	Day	7% 5% 2 7% 5% 6% 7% 5% 8% 11% 37%	4234
	11th to 20th	Day	8% 6% 2 7% 5% 5% 6% 5% 7% 10% 39%	4174
	21st to end	Day	5% 4 1 5% 4 3 5% 4 6% 9% 54%	4540
September	1st to 10th	Day	13% 6% 2 5% 4 4 4 4 5% 7% 47%	2200
	11th to 20th	Day	9% 6% 2 5% 4 4 4 4 5% 7% 50%	2200
	21st to end	Day	18% 6% 2 6% 4 4 4 4 4 5% 43%	2200
October	1st to 10th	Day	11% 6% 2 5% 3 3 4 3 5% 8% 49%	2135
	11th to 20th	Day	13% 7% 2 6% 4 4 4 3 5% 6% 48%	2000
	21st to end	Day	19% 7% 3 7% 5% 3 3 3 4 6% 41%	2200
November	1st to 10th	Day	12% 7% 2 5% 4 4 4 3 5% 7% 48%	1853
	11th to 20th	Day	16% 11% 2 7% 5% 4 3 3 6% 6% 38%	1890
	21st to end	Day	15% 11% 3 8% 5% 4 5% 3 4 5% 36%	1890
December	1st to 10th	Day	18% 12% 4 9% 5% 5% 4 3 4 5% 31%	3020
	11th to 20th	Day	22% 14% 6% 8% 4 4 5% 3 5% 5% 25%	3463
	21st to end	Day	17% 17% 5% 11% 6% 5% 5% 3 5% 5% 21%	4565
January	1st to 10th	Night	14% 15% 6% 14% 6% 5% 5% 4 5% 5% 20%	7635
	11th to 20th	Night	16% 14% 6% 14% 7% 5% 4 2 4 4 24%	7680
	21st to end	Night	18% 11% 4 10% 6% 5% 4 3 4 5% 30%	8401
February	1st to 10th	Night	19% 13% 5% 9% 6% 4 4 3 4 5% 30%	2730
	11th to 20th	Night	20% 13% 4 8% 5% 5% 3 3 5% 5% 30%	2468
	21st to end	Night	20% 14% 4 8% 4 4 4 2 4 5% 30%	2076
March	1st to 10th	Night	18% 12% 3 5% 4 4 4 3 4 6% 37%	5212
	11th to 20th	Night	11% 9% 2 6% 4 4 4 3 6% 9% 42%	5090
	21st to end	Night	14% 10% 4 9% 6% 5% 5% 4 5% 6% 32%	5588
April	1st to 10th	Night	15% 9% 2 6% 5% 4 4 4 5% 6% 39%	2310
	11th to 20th	Night	13% 8% 3 6% 3 4 6% 4 5% 8% 40%	1939
	21st to end	Night	15% 8% 3 7% 4 3 5% 3 5% 7% 39%	1890
May	1st to 10th	Night	19% 12% 3 7% 5% 4 5% 4 6% 7% 28%	4123
	11th to 20th	Night	15% 7% 3 7% 5% 4 5% 4 6% 9% 34%	4122
	21st to end	Night	14% 8% 3 7% 5% 5% 5% 4 7% 9% 34%	4520
June	1st to 10th	Night	9% 5% 2 6% 4 4 5% 4 7% 10% 44%	1800
	11th to 20th	Night	7% 5% 2 6% 5% 4 5% 5% 7% 10% 43%	1800
	21st to end	Night	8% 5% 2 5% 4 4 5% 5% 8% 11% 44%	1800
July	1st to 10th	Night	8% 6% 3 7% 4 5% 4 4 7% 9% 43%	4058
	11th to 20th	Night	8% 8% 3 7% 5% 5% 6% 5% 8% 10% 37%	4057
	21st to end	Night	9% 8% 3 8% 5% 4 5% 5% 7% 9% 37%	4427
August	1st to 10th	Night	7% 7% 3 8% 5% 5% 5% 5% 7% 9% 39%	2915
	11th to 20th	Night	8% 7% 3 6% 5% 4 5% 5% 6% 7% 43%	2875
	21st to end	Night	4 3 1 4 4 3 5% 4 7% 9% 55%	3306
September	1st to 10th	Night	11% 4 2 6% 3 3 4 4 5% 7% 52%	2200
	11th to 20th	Night	9% 4 2 5% 4 4 4 3 5% 7% 54%	2200
	21st to end	Night	15% 6% 2 7% 4 4 4 3 5% 6% 44%	2200
October	1st to 10th	Night	11% 5% 2 5% 4 3 3 3 5% 6% 53%	2265
	11th to 20th	Night	13% 6% 2 6% 3 3 3 4 6% 7% 47%	2400
	21st to end	Night	19% 7% 2 5% 4 3 3 3 4 6% 42%	2640
November	1st to 10th	Night	12% 7% 2 5% 4 4 3 4 4 6% 50%	2661
	11th to 20th	Night	15% 10% 3 7% 5% 3 5% 3 5% 6% 40%	2730
	21st to end	Night	18% 12% 3 7% 5% 3 3 3 4 5% 36%	2730
December	1st to 10th	Night	16% 11% 4 11% 5% 4 4 3 4 5% 34%	4380
	11th to 20th	Night	17% 13% 8% 10% 5% 4 4 3 4 6% 28%	4952
	21st to end	Night	16% 16% 5% 12% 6% 6% 5% 4 5% 6% 20%	6633

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	64% 3 12% 16% 5%	5259
	11th to 20th	Day	62% 3 6% 15% 12% 2	5280
	21st to end	Day	65% 3 8% 18% 5% 1	5780
February	1st to 10th	Day	57% 5% 10% 18% 9% 1	1890
	11th to 20th	Day	58% 4 9% 18% 9% 1	2043
	21st to end	Day	54% 3 9% 22% 10% 2	1730
March	1st to 10th	Day	55% 4 6% 21% 11% 3	4859
	11th to 20th	Day	41% 4 8% 26% 18% 3	5090
	21st to end	Day	48% 5% 9% 22% 14% 2	5586
April	1st to 10th	Day	46% 5% 11% 23% 11% 3	2310
	11th to 20th	Day	44% 5% 9% 22% 17% 4	2648
	21st to end	Day	47% 6% 12% 21% 12% 3	2730
May	1st to 10th	Day	53% 6% 11% 19% 10% 2	6027
	11th to 20th	Day	51% 6% 9% 23% 10% 1	5995
	21st to end	Day	44% 7% 12% 20% 14% 3	6590
June	1st to 10th	Day	38% 8% 14% 23% 16% 1	2600
	11th to 20th	Day	39% 8% 14% 21% 15% 2	2600
	21st to end	Day	36% 10% 14% 23% 14% 3	2600
July	1st to 10th	Day	37% 7% 11% 27% 16% 1	5835
	11th to 20th	Day	41% 9% 14% 25% 10% 1	5831
	21st to end	Day	46% 7% 12% 18% 15% 1	6240
August	1st to 10th	Day	37% 9% 14% 29% 10%	4221
	11th to 20th	Day	37% 7% 10% 30% 16% 1	4213
	21st to end	Day	26% 6% 15% 30% 21% 2	4540
September	1st to 10th	Day	37% 5% 10% 20% 22% 6%	2200
	11th to 20th	Day	34% 5% 10% 26% 22% 2	2200
	21st to end	Day	43% 6% 8% 23% 19% 2	2200
October	1st to 10th	Day	25% 3 8% 29% 33% 2	3473
	11th to 20th	Day	29% 3 10% 31% 23% 4	3240
	21st to end	Day	33% 3 11% 28% 23% 2	3538
November	1st to 10th	Day	36% 5% 9% 28% 19% 3	1853
	11th to 20th	Day	47% 3 9% 21% 17% 3	1890
	21st to end	Day	50% 4 10% 21% 14% 1	1890
December	1st to 10th	Day	56% 4 8% 23% 9%	3020
	11th to 20th	Day	62% 4 9% 17% 7%	3460
	21st to end	Day	65% 5% 10% 14% 6%	4565
January	1st to 10th	Night	65% 4 10% 15% 6%	7636
	11th to 20th	Night	63% 3 7% 15% 10% 2	7680
	21st to end	Night	57% 2 10% 20% 9% 1	8401
February	1st to 10th	Night	58% 4 9% 19% 9% 1	2730
	11th to 20th	Night	57% 4 9% 19% 11% 1	2469
	21st to end	Night	58% 3 10% 17% 10% 3	2076
March	1st to 10th	Night	48% 4 6% 26% 14% 3	5212
	11th to 20th	Night	39% 4 8% 28% 20% 1	5090
	21st to end	Night	52% 4 8% 22% 13% 2	5588
April	1st to 10th	Night	45% 5% 10% 21% 16% 3	2310
	11th to 20th	Night	40% 6% 11% 21% 15% 7%	1939
	21st to end	Night	43% 6% 10% 22% 17% 2	1890
May	1st to 10th	Night	54% 7% 11% 16% 10% 3	4150
	11th to 20th	Night	45% 8% 13% 20% 12% 1	4123
	21st to end	Night	44% 7% 14% 21% 10% 3	4528
June	1st to 10th	Night	33% 8% 12% 25% 19% 3	1800
	11th to 20th	Night	34% 8% 16% 19% 21% 3	1800
	21st to end	Night	32% 9% 15% 23% 19% 2	1800
July	1st to 10th	Night	36% 8% 11% 24% 19% 3	4015
	11th to 20th	Night	39% 9% 16% 23% 12% 1	4006
	21st to end	Night	42% 8% 12% 22% 13% 3	4297
August	1st to 10th	Night	38% 8% 14% 28% 11% 1	2904
	11th to 20th	Night	38% 7% 9% 24% 21% 1	2902
	21st to end	Night	25% 6% 13% 31% 23% 3	3306
September	1st to 10th	Night	31% 7% 13% 21% 21% 7%	2200
	11th to 20th	Night	30% 4 11% 24% 27% 3	2200
	21st to end	Night	40% 5% 10% 20% 24% 1	2200
October	1st to 10th	Night	27% 4 7% 25% 34% 4	3707
	11th to 20th	Night	28% 4 8% 26% 26% 8%	3899
	21st to end	Night	32% 3 7% 25% 26% 6%	4252
November	1st to 10th	Night	36% 3 10% 24% 22% 4	2661
	11th to 20th	Night	45% 3 8% 22% 18% 3	2730
	21st to end	Night	50% 3 10% 22% 13% 1	2730
December	1st to 10th	Night	54% 4 11% 23% 8%	4380
	11th to 20th	Night	59% 3 11% 19% 6% 1	4954
	21st to end	Night	64% 4 10% 15% 6%	6633

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	29% 25% 31% 11% 4 1	330
	11th to 20th	Day	35% 27% 28% 9% 1	330
	21st to end	Day	30% 28% 29% 9% 4	363
February	1st to 10th	Day	33% 20% 32% 12% 4	330
	11th to 20th	Day	41% 23% 29% 5% 1 1	330
	21st to end	Day	33% 23% 37% 7%	273
March	1st to 10th	Day	31% 22% 29% 14% 4	453
	11th to 20th	Day	28% 20% 34% 13% 4 1	540
	21st to end	Day	29% 20% 33% 15% 3	594
April	1st to 10th	Day	24% 21% 30% 16% 8% 1	540
	11th to 20th	Day	23% 17% 32% 17% 8% 2	532
	21st to end	Day	22% 18% 34% 18% 6% 2	540
May	1st to 10th	Day	22% 20% 31% 17% 7% 3	543
	11th to 20th	Day	19% 14% 28% 24% 10% 5%	567
	21st to end	Day	16% 11% 26% 23% 18% 6%	617
June	1st to 10th	Day	13% 7% 27% 29% 18% 6%	530
	11th to 20th	Day	12% 8% 25% 30% 17% 7%	530
	21st to end	Day	11% 6% 30% 24% 19% 10%	530
July	1st to 10th	Day	12% 5% 18% 25% 20% 19%	525
	11th to 20th	Day	9% 6% 21% 29% 24% 11%	524
	21st to end	Day	14% 4 20% 28% 22% 13%	576
August	1st to 10th	Day	9% 5% 18% 31% 27% 10%	526
	11th to 20th	Day	12% 4 18% 32% 23% 11%	519
	21st to end	Day	10% 3 17% 32% 25% 13%	583
September	1st to 10th	Day	14% 5% 15% 29% 25% 12%	530
	11th to 20th	Day	10% 2 15% 28% 31% 14%	530
	21st to end	Day	22% 9% 19% 25% 20% 5%	530
October	1st to 10th	Day	14% 7% 24% 28% 19% 8%	530
	11th to 20th	Day	15% 12% 33% 22% 14% 4	530
	21st to end	Day	24% 12% 33% 23% 8% 1	583
November	1st to 10th	Day	20% 15% 35% 22% 6% 2	331
	11th to 20th	Day	30% 15% 30% 18% 6% 1	330
	21st to end	Day	25% 22% 35% 15% 4	330
December	1st to 10th	Day	27% 21% 35% 12% 5%	330
	11th to 20th	Day	27% 22% 32% 15% 3 1	330
	21st to end	Day	32% 19% 32% 13% 4 1	363
January	1st to 10th	Night	26% 18% 32% 20% 4	840
	11th to 20th	Night	31% 20% 30% 17% 2	840
	21st to end	Night	26% 19% 32% 21% 2	924
February	1st to 10th	Night	28% 14% 30% 26% 1	840
	11th to 20th	Night	29% 20% 31% 19% 1	823
	21st to end	Night	27% 18% 34% 19% 1	692
March	1st to 10th	Night	26% 15% 30% 25% 4	840
	11th to 20th	Night	25% 18% 30% 20% 7% 1	840
	21st to end	Night	23% 16% 32% 23% 6%	924
April	1st to 10th	Night	22% 15% 33% 23% 7%	840
	11th to 20th	Night	15% 15% 35% 24% 10% 1	648
	21st to end	Night	18% 9% 37% 28% 7%	630
May	1st to 10th	Night	19% 10% 29% 30% 10% 1	630
	11th to 20th	Night	17% 7% 28% 30% 16% 1	621
	21st to end	Night	12% 6% 19% 35% 24% 4	683
June	1st to 10th	Night	9% 4 22% 41% 23% 2	600
	11th to 20th	Night	9% 4 18% 41% 25% 3	600
	21st to end	Night	9% 4 21% 34% 30% 3	600
July	1st to 10th	Night	11% 2 16% 31% 33% 8%	585
	11th to 20th	Night	7% 3 14% 39% 34% 4	582
	21st to end	Night	9% 3 15% 34% 34% 6%	657
August	1st to 10th	Night	9% 3 11% 39% 34% 3	597
	11th to 20th	Night	9% 3 12% 35% 33% 7%	594
	21st to end	Night	8% 2 15% 33% 34% 7%	667
September	1st to 10th	Night	13% 2 13% 34% 33% 5%	800
	11th to 20th	Night	11% 4 14% 33% 33% 6%	800
	21st to end	Night	17% 6% 20% 33% 21% 3	800
October	1st to 10th	Night	13% 5% 19% 33% 27% 3	800
	11th to 20th	Night	16% 9% 26% 32% 14% 2	800
	21st to end	Night	22% 11% 25% 29% 12% 1	880
November	1st to 10th	Night	17% 9% 27% 30% 16% 1	820
	11th to 20th	Night	21% 15% 28% 26% 9% 1	840
	21st to end	Night	25% 13% 25% 30% 8% 1	840
December	1st to 10th	Night	28% 15% 29% 23% 5%	840
	11th to 20th	Night	23% 16% 31% 25% 5%	840
	21st to end	Night	26% 17% 29% 25% 2	924

Page generated at 2026-05-29 01:53:25. Version ac07

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