Teeples Hill
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Teeples Hill clear sky chart from 2005-11-06 to 2026-04-17.

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% 12% 4 9% 6% 5% 5% 3 5% 6% 30%	131888
	Night	14% 12% 4 10% 6% 5% 4 3 5% 6% 29%	130268
Transparency	Day	52% 6% 11% 19% 11% 1	135405
	Night	53% 6% 11% 19% 10% 1	134838
Seeing	Day	24% 18% 31% 17% 7% 2	16151
	Night	22% 16% 31% 22% 8% 1	25463

By Month

Percentage Cloud Cover NE (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	12% 16% 5% 14% 11% 8% 5% 4 5% 5% 16%	4661
	11th to 20th	Day	10% 21% 9% 15% 7% 6% 5% 3 4 4 15%	4650
	21st to end	Day	9% 16% 7% 18% 8% 7% 5% 3 3 4 18%	5579
February	1st to 10th	Day	11% 16% 5% 14% 8% 6% 5% 4 6% 4 21%	1890
	11th to 20th	Day	11% 15% 6% 13% 7% 5% 4 4 5% 5% 25%	1843
	21st to end	Day	16% 17% 4 11% 6% 7% 5% 4 4 5% 23%	1672
March	1st to 10th	Day	16% 15% 5% 12% 6% 4 4 3 4 6% 25%	4759
	11th to 20th	Day	10% 14% 5% 11% 6% 5% 5% 4 6% 6% 27%	5090
	21st to end	Day	15% 14% 4 9% 4 3 3 3 4 4 37%	5768
April	1st to 10th	Day	19% 15% 4 7% 5% 4 5% 2 4 5% 29%	2520
	11th to 20th	Day	22% 13% 3 6% 4 4 3 3 3 4 36%	2446
	21st to end	Day	21% 11% 4 8% 4 4 4 3 4 5% 33%	2565
May	1st to 10th	Day	21% 10% 3 8% 5% 4 4 3 5% 6% 30%	6316
	11th to 20th	Day	15% 10% 3 8% 5% 5% 5% 4 6% 7% 33%	6318
	21st to end	Day	19% 9% 3 8% 5% 4 5% 3 5% 6% 33%	6949
June	1st to 10th	Day	21% 9% 2 7% 5% 5% 4 4 5% 7% 30%	2800
	11th to 20th	Day	14% 6% 3 6% 5% 5% 5% 5% 6% 8% 36%	2800
	21st to end	Day	16% 9% 3 7% 5% 5% 5% 4 6% 8% 33%	2800
July	1st to 10th	Day	13% 7% 3 8% 5% 5% 6% 4 7% 9% 33%	6360
	11th to 20th	Day	10% 6% 2 7% 5% 5% 5% 4 6% 8% 42%	6360
	21st to end	Day	8% 6% 2 6% 5% 4 5% 4 6% 9% 45%	6926
August	1st to 10th	Day	14% 8% 3 8% 6% 5% 5% 4 6% 7% 34%	4340
	11th to 20th	Day	17% 7% 2 7% 4 5% 5% 4 6% 7% 34%	4174
	21st to end	Day	11% 6% 2 6% 5% 5% 6% 5% 7% 10% 38%	4355
September	1st to 10th	Day	13% 7% 3 7% 5% 5% 5% 3 5% 8% 39%	2400
	11th to 20th	Day	11% 6% 2 7% 4 4 5% 3 5% 7% 46%	2400
	21st to end	Day	18% 8% 2 7% 5% 4 4 4 5% 6% 37%	2105
October	1st to 10th	Day	19% 11% 3 8% 4 4 4 3 4 6% 35%	2000
	11th to 20th	Day	19% 14% 4 8% 5% 5% 4 4 5% 5% 27%	2000
	21st to end	Day	24% 13% 4 9% 5% 4 5% 4 4 5% 23%	2105
November	1st to 10th	Day	15% 13% 3 8% 5% 4 4 4 5% 7% 32%	1783
	11th to 20th	Day	15% 14% 6% 9% 7% 4 5% 3 4 5% 26%	1680
	21st to end	Day	20% 17% 5% 11% 6% 5% 5% 4 4 5% 18%	1680
December	1st to 10th	Day	17% 23% 7% 13% 7% 6% 4 3 4 5% 11%	2680
	11th to 20th	Day	15% 19% 6% 15% 6% 4 3 3 3 3 23%	3066
	21st to end	Day	20% 19% 7% 14% 6% 3 3 2 3 4 19%	4048
January	1st to 10th	Night	12% 15% 9% 17% 9% 5% 5% 3 4 5% 17%	8234
	11th to 20th	Night	9% 18% 7% 16% 8% 7% 5% 3 5% 5% 16%	8235
	21st to end	Night	9% 15% 7% 13% 8% 8% 6% 4 5% 5% 20%	8599
February	1st to 10th	Night	10% 16% 6% 13% 8% 6% 5% 5% 4 5% 23%	2730
	11th to 20th	Night	11% 14% 6% 11% 7% 6% 4 3 5% 5% 27%	2663
	21st to end	Night	12% 14% 4 10% 7% 6% 5% 4 6% 6% 27%	2134
March	1st to 10th	Night	18% 15% 5% 11% 6% 4 4 3 3 4 28%	5296
	11th to 20th	Night	9% 13% 5% 9% 7% 6% 6% 4 7% 7% 27%	5089
	21st to end	Night	15% 12% 4 10% 6% 4 4 3 5% 6% 30%	5406
April	1st to 10th	Night	19% 13% 3 8% 5% 5% 3 3 4 6% 31%	2100
	11th to 20th	Night	18% 11% 3 7% 5% 4 4 3 4 6% 36%	2036
	21st to end	Night	19% 10% 4 8% 4 5% 5% 3 5% 6% 32%	1851
May	1st to 10th	Night	21% 10% 3 7% 5% 5% 4 4 6% 7% 29%	3622
	11th to 20th	Night	14% 7% 2 6% 4 4 4 3 5% 7% 42%	3575
	21st to end	Night	18% 8% 2 7% 4 4 5% 4 6% 7% 34%	3926
June	1st to 10th	Night	15% 7% 3 7% 5% 4 5% 4 6% 8% 34%	1600
	11th to 20th	Night	12% 8% 2 6% 4 4 5% 4 4 7% 43%	1600
	21st to end	Night	18% 6% 2 7% 5% 4 4 3 6% 8% 37%	1600
July	1st to 10th	Night	12% 8% 3 8% 5% 6% 5% 5% 6% 7% 37%	3600
	11th to 20th	Night	11% 6% 2 6% 4 4 4 3 5% 7% 47%	3600
	21st to end	Night	8% 5% 2 5% 4 4 5% 4 6% 8% 50%	3926
August	1st to 10th	Night	11% 5% 2 6% 5% 4 5% 4 6% 9% 43%	2806
	11th to 20th	Night	14% 6% 3 6% 4 4 3 3 6% 7% 43%	2875
	21st to end	Night	12% 6% 2 5% 4 4 5% 4 6% 9% 43%	3510
September	1st to 10th	Night	10% 6% 2 5% 4 4 5% 4 5% 8% 46%	2000
	11th to 20th	Night	12% 6% 2 4 3 3 4 4 4 6% 52%	2000
	21st to end	Night	16% 8% 2 7% 4 3 4 3 5% 6% 41%	2293
October	1st to 10th	Night	17% 9% 3 7% 4 4 4 3 4 6% 40%	2400
	11th to 20th	Night	18% 11% 3 8% 6% 5% 4 4 5% 5% 31%	2400
	21st to end	Night	20% 13% 4 7% 5% 5% 5% 3 5% 6% 27%	2734
November	1st to 10th	Night	15% 13% 5% 8% 5% 5% 4 4 5% 6% 32%	2730
	11th to 20th	Night	16% 13% 4 10% 6% 5% 5% 3 5% 5% 27%	2940
	21st to end	Night	18% 17% 6% 11% 6% 4 4 3 4 6% 20%	2940
December	1st to 10th	Night	16% 19% 6% 13% 7% 6% 5% 4 5% 6% 15%	4720
	11th to 20th	Night	19% 16% 6% 13% 5% 4 3 3 3 4 22%	5348
	21st to end	Night	22% 20% 5% 13% 6% 4 3 2 3 4 18%	7150

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	68% 6% 10% 10% 6% 1	4662
	11th to 20th	Day	71% 5% 7% 8% 8% 1	4680
	21st to end	Day	69% 5% 6% 11% 8% 1	5579
February	1st to 10th	Day	64% 5% 8% 15% 6% 1	1890
	11th to 20th	Day	60% 4 11% 16% 9% 1	1852
	21st to end	Day	63% 5% 9% 12% 10% 1	1672
March	1st to 10th	Day	61% 4 9% 10% 14% 2	4762
	11th to 20th	Day	54% 6% 14% 15% 9% 2	5090
	21st to end	Day	51% 4 6% 19% 17% 3	5768
April	1st to 10th	Day	56% 5% 7% 17% 12% 3	2520
	11th to 20th	Day	53% 5% 6% 20% 15% 2	2446
	21st to end	Day	54% 4 8% 16% 15% 3	2565
May	1st to 10th	Day	53% 5% 8% 19% 11% 4	6327
	11th to 20th	Day	48% 8% 10% 17% 15% 1	6322
	21st to end	Day	49% 7% 11% 19% 12% 2	6949
June	1st to 10th	Day	53% 6% 10% 19% 12% 1	2800
	11th to 20th	Day	43% 6% 11% 23% 13% 2	2800
	21st to end	Day	48% 7% 11% 21% 11% 1	2800
July	1st to 10th	Day	44% 7% 13% 25% 10%	6290
	11th to 20th	Day	36% 8% 12% 28% 15%	6285
	21st to end	Day	33% 7% 13% 35% 11%	6728
August	1st to 10th	Day	47% 7% 13% 22% 10%	4326
	11th to 20th	Day	45% 7% 14% 26% 7% 1	4213
	21st to end	Day	37% 8% 15% 30% 10% 1	4355
September	1st to 10th	Day	41% 7% 13% 28% 11%	2400
	11th to 20th	Day	36% 7% 12% 30% 15%	2400
	21st to end	Day	47% 7% 13% 23% 11%	2105
October	1st to 10th	Day	48% 6% 10% 28% 8%	3260
	11th to 20th	Day	47% 6% 13% 22% 12% 1	3240
	21st to end	Day	55% 6% 14% 18% 6% 1	3382
November	1st to 10th	Day	51% 7% 13% 21% 7% 1	1783
	11th to 20th	Day	58% 6% 12% 14% 9% 1	1680
	21st to end	Day	68% 7% 9% 10% 6% 1	1680
December	1st to 10th	Day	74% 6% 10% 8% 2	2680
	11th to 20th	Day	66% 5% 8% 13% 7%	3066
	21st to end	Day	70% 3 7% 14% 5%	4048
January	1st to 10th	Night	69% 5% 9% 11% 5%	8234
	11th to 20th	Night	68% 6% 9% 11% 6%	8280
	21st to end	Night	64% 5% 7% 11% 12% 1	8599
February	1st to 10th	Night	60% 6% 10% 16% 7% 1	2730
	11th to 20th	Night	59% 4 10% 19% 7% 1	2665
	21st to end	Night	57% 6% 9% 18% 10% 1	2134
March	1st to 10th	Night	61% 3 8% 15% 10% 4	5306
	11th to 20th	Night	52% 8% 16% 16% 7% 2	5090
	21st to end	Night	52% 6% 8% 19% 13% 2	5406
April	1st to 10th	Night	54% 5% 7% 19% 12% 2	2100
	11th to 20th	Night	49% 5% 7% 23% 15% 1	2036
	21st to end	Night	51% 6% 7% 17% 16% 2	1851
May	1st to 10th	Night	53% 6% 8% 19% 10% 4	3628
	11th to 20th	Night	38% 9% 14% 22% 14% 2	3576
	21st to end	Night	47% 8% 12% 19% 13% 1	3927
June	1st to 10th	Night	44% 7% 13% 23% 11% 1	1600
	11th to 20th	Night	39% 7% 11% 26% 16% 2	1600
	21st to end	Night	44% 7% 16% 21% 12% 1	1600
July	1st to 10th	Night	42% 8% 16% 19% 14% 1	3560
	11th to 20th	Night	35% 6% 12% 33% 13%	3552
	21st to end	Night	32% 7% 13% 35% 13%	3809
August	1st to 10th	Night	36% 8% 15% 27% 12% 2	2796
	11th to 20th	Night	38% 7% 15% 30% 9% 1	2902
	21st to end	Night	35% 7% 16% 30% 10% 2	3510
September	1st to 10th	Night	34% 7% 14% 30% 14% 1	2000
	11th to 20th	Night	33% 7% 13% 36% 11% 1	2000
	21st to end	Night	42% 7% 11% 29% 11% 1	2293
October	1st to 10th	Night	39% 5% 12% 29% 15%	3920
	11th to 20th	Night	46% 6% 16% 21% 11%	3899
	21st to end	Night	51% 7% 16% 20% 7%	4407
November	1st to 10th	Night	51% 6% 13% 20% 8%	2730
	11th to 20th	Night	57% 6% 10% 18% 8% 1	2940
	21st to end	Night	64% 6% 10% 15% 4	2940
December	1st to 10th	Night	67% 7% 13% 10% 2	4720
	11th to 20th	Night	65% 5% 8% 12% 10% 1	5348
	21st to end	Night	71% 4 5% 11% 8%	7150

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% 21% 40% 12% 4	220
	11th to 20th	Day	30% 21% 35% 11% 3	220
	21st to end	Day	25% 25% 32% 14% 3	327
February	1st to 10th	Day	31% 27% 29% 8% 4	330
	11th to 20th	Day	30% 29% 37% 4 1	330
	21st to end	Day	34% 24% 34% 8% 1	388
March	1st to 10th	Day	28% 25% 33% 12% 2	540
	11th to 20th	Day	33% 20% 30% 14% 3	540
	21st to end	Day	33% 24% 28% 10% 4 1	594
April	1st to 10th	Day	33% 24% 26% 12% 4	540
	11th to 20th	Day	37% 21% 22% 11% 8% 1	516
	21st to end	Day	32% 22% 30% 11% 5% 1	500
May	1st to 10th	Day	27% 20% 29% 16% 6% 3	503
	11th to 20th	Day	20% 18% 33% 20% 7% 2	527
	21st to end	Day	22% 17% 32% 18% 9% 2	573
June	1st to 10th	Day	25% 15% 36% 17% 7%	530
	11th to 20th	Day	17% 17% 31% 22% 9% 2	530
	21st to end	Day	21% 15% 36% 17% 9% 2	530
July	1st to 10th	Day	12% 10% 34% 33% 10% 2	525
	11th to 20th	Day	14% 14% 35% 24% 12% 2	524
	21st to end	Day	14% 11% 37% 26% 10% 3	576
August	1st to 10th	Day	15% 10% 32% 29% 11% 4	526
	11th to 20th	Day	16% 9% 31% 26% 14% 5%	519
	21st to end	Day	15% 13% 31% 25% 11% 4	583
September	1st to 10th	Day	19% 13% 30% 20% 13% 5%	530
	11th to 20th	Day	12% 11% 23% 28% 15% 12%	530
	21st to end	Day	20% 16% 28% 21% 10% 5%	530
October	1st to 10th	Day	25% 18% 25% 18% 10% 4	530
	11th to 20th	Day	28% 21% 32% 13% 5% 1	530
	21st to end	Day	32% 18% 30% 16% 4	531
November	1st to 10th	Day	31% 18% 29% 16% 5%	357
	11th to 20th	Day	28% 22% 33% 10% 5% 1	220
	21st to end	Day	33% 27% 29% 8% 2	220
December	1st to 10th	Day	29% 20% 38% 12% 2	220
	11th to 20th	Day	31% 34% 24% 8% 1 1	220
	21st to end	Day	33% 27% 24% 12% 3 1	242
January	1st to 10th	Night	25% 22% 35% 15% 4	840
	11th to 20th	Night	27% 20% 31% 17% 5%	840
	21st to end	Night	18% 20% 35% 21% 5% 1	924
February	1st to 10th	Night	21% 22% 36% 19% 2	840
	11th to 20th	Night	21% 23% 39% 14% 2	823
	21st to end	Night	23% 23% 33% 18% 3	692
March	1st to 10th	Night	25% 22% 33% 16% 3	840
	11th to 20th	Night	26% 20% 32% 18% 3 1	840
	21st to end	Night	24% 19% 32% 19% 6% 1	924
April	1st to 10th	Night	31% 17% 30% 19% 4	840
	11th to 20th	Night	25% 21% 29% 18% 7%	816
	21st to end	Night	24% 18% 26% 24% 8%	651
May	1st to 10th	Night	24% 10% 28% 28% 9% 1	415
	11th to 20th	Night	20% 12% 34% 26% 7%	394
	21st to end	Night	15% 11% 32% 30% 11%	433
June	1st to 10th	Night	17% 10% 38% 28% 8% 1	400
	11th to 20th	Night	18% 11% 33% 29% 9% 1	400
	21st to end	Night	19% 11% 29% 30% 11% 1	400
July	1st to 10th	Night	9% 9% 35% 34% 11% 1	390
	11th to 20th	Night	11% 7% 29% 40% 13% 1	388
	21st to end	Night	10% 6% 32% 41% 10% 1	438
August	1st to 10th	Night	9% 5% 27% 39% 18% 1	527
	11th to 20th	Night	9% 6% 25% 38% 19% 3	594
	21st to end	Night	14% 9% 30% 30% 16% 2	830
September	1st to 10th	Night	13% 9% 32% 28% 16% 2	800
	11th to 20th	Night	15% 8% 23% 30% 20% 4	800
	21st to end	Night	21% 12% 23% 26% 16% 3	800
October	1st to 10th	Night	22% 13% 28% 22% 12% 2	800
	11th to 20th	Night	26% 18% 30% 19% 7% 1	800
	21st to end	Night	28% 16% 29% 22% 4	880
November	1st to 10th	Night	26% 18% 28% 22% 6% 1	820
	11th to 20th	Night	25% 20% 30% 15% 8% 1	840
	21st to end	Night	31% 20% 26% 20% 4	840
December	1st to 10th	Night	28% 20% 33% 15% 4	840
	11th to 20th	Night	27% 25% 30% 16% 2 1	840
	21st to end	Night	34% 18% 30% 14% 4	924

Page generated at 2026-04-14 02:44:24. Version ac07

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