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 2024-12-24.

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% 11% 4 9% 5% 5% 5% 4 5% 6% 31%	101991
	Night	15% 12% 4 9% 6% 5% 4 3 5% 6% 31%	98128
Transparency	Day	51% 6% 11% 20% 10% 1	105526
	Night	52% 6% 12% 20% 9% 1	102682
Seeing	Day	24% 18% 31% 18% 7% 2	14524
	Night	22% 16% 31% 22% 8% 1	23765

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	14% 16% 5% 16% 8% 5% 4 4 4 4 19%	2517
	11th to 20th	Day	12% 14% 8% 17% 8% 6% 5% 3 5% 5% 18%	2520
	21st to end	Day	15% 22% 7% 16% 6% 5% 3 2 3 4 17%	3007
February	1st to 10th	Day	12% 16% 5% 14% 9% 6% 5% 4 6% 4 20%	1710
	11th to 20th	Day	11% 15% 6% 12% 6% 5% 4 3 5% 5% 26%	1663
	21st to end	Day	16% 17% 3 10% 5% 7% 5% 4 4 5% 24%	1517
March	1st to 10th	Day	16% 17% 5% 10% 5% 4 4 2 4 5% 27%	3239
	11th to 20th	Day	8% 18% 6% 12% 7% 5% 4 3 5% 5% 27%	3480
	21st to end	Day	10% 10% 4 8% 5% 4 3 3 5% 6% 43%	3937
April	1st to 10th	Day	19% 15% 3 7% 5% 4 5% 2 4 5% 29%	2280
	11th to 20th	Day	21% 12% 3 6% 4 4 3 3 3 4 37%	2254
	21st to end	Day	22% 11% 4 8% 4 4 4 3 4 5% 33%	2437
May	1st to 10th	Day	19% 9% 3 8% 5% 5% 5% 3 5% 7% 32%	4410
	11th to 20th	Day	15% 10% 3 8% 4 4 5% 4 6% 8% 32%	4398
	21st to end	Day	14% 8% 2 7% 5% 4 5% 4 6% 7% 38%	4837
June	1st to 10th	Day	21% 9% 2 7% 5% 5% 4 4 5% 7% 30%	2660
	11th to 20th	Day	15% 7% 3 7% 5% 5% 5% 4 6% 8% 36%	2660
	21st to end	Day	17% 9% 3 7% 5% 5% 5% 4 6% 8% 32%	2660
July	1st to 10th	Day	11% 8% 3 8% 5% 5% 6% 4 7% 9% 33%	4440
	11th to 20th	Day	12% 6% 2 7% 5% 5% 5% 5% 7% 9% 38%	4440
	21st to end	Day	9% 7% 2 6% 5% 4 5% 4 6% 8% 43%	4814
August	1st to 10th	Day	14% 9% 3 8% 6% 5% 5% 4 6% 7% 33%	4207
	11th to 20th	Day	17% 8% 2 7% 4 5% 5% 4 6% 7% 34%	4044
	21st to end	Day	11% 6% 2 6% 5% 5% 6% 5% 7% 10% 38%	4222
September	1st to 10th	Day	14% 8% 3 7% 5% 5% 5% 3 5% 8% 39%	2280
	11th to 20th	Day	12% 6% 2 7% 4 4 5% 3 5% 7% 45%	2280
	21st to end	Day	18% 8% 2 7% 5% 4 4 4 5% 6% 37%	2000
October	1st to 10th	Day	20% 11% 3 8% 4 4 4 3 4 6% 34%	1900
	11th to 20th	Day	19% 15% 4 8% 5% 5% 4 4 5% 5% 27%	1900
	21st to end	Day	24% 14% 4 9% 5% 4 5% 4 4 5% 22%	2000
November	1st to 10th	Day	14% 12% 3 8% 6% 4 4 4 5% 7% 32%	1696
	11th to 20th	Day	16% 14% 5% 9% 7% 4 5% 4 4 5% 27%	1600
	21st to end	Day	20% 17% 5% 12% 6% 5% 5% 4 4 5% 18%	1600
December	1st to 10th	Day	18% 21% 8% 12% 7% 6% 4 3 4 4 14%	1600
	11th to 20th	Day	17% 17% 5% 13% 5% 4 4 3 4 4 24%	1986
	21st to end	Day	23% 20% 6% 16% 5% 2 3 2 2 3 18%	2796
January	1st to 10th	Night	14% 16% 8% 15% 7% 5% 5% 4 5% 5% 16%	4429
	11th to 20th	Night	10% 15% 5% 15% 9% 7% 6% 4 5% 6% 18%	4440
	21st to end	Night	15% 18% 7% 13% 7% 7% 4 3 4 4 18%	4646
February	1st to 10th	Night	11% 16% 6% 12% 8% 6% 5% 4 4 5% 22%	2470
	11th to 20th	Night	12% 14% 5% 11% 7% 5% 4 3 4 5% 28%	2403
	21st to end	Night	12% 13% 4 10% 7% 5% 4 4 6% 6% 28%	1937
March	1st to 10th	Night	17% 14% 5% 10% 6% 4 4 2 3 4 31%	3596
	11th to 20th	Night	12% 17% 6% 11% 7% 6% 4 3 6% 5% 24%	3479
	21st to end	Night	11% 10% 4 9% 6% 4 4 3 5% 7% 36%	3695
April	1st to 10th	Night	19% 12% 3 8% 5% 5% 3 3 4 6% 32%	1900
	11th to 20th	Night	18% 10% 3 7% 5% 4 4 4 4 6% 37%	1875
	21st to end	Night	19% 10% 4 8% 4 5% 4 3 5% 6% 32%	1759
May	1st to 10th	Night	19% 11% 3 6% 4 5% 4 4 6% 6% 33%	2528
	11th to 20th	Night	16% 9% 3 6% 5% 5% 5% 4 6% 7% 36%	2495
	21st to end	Night	12% 7% 2 7% 4 5% 5% 4 6% 8% 40%	2738
June	1st to 10th	Night	15% 7% 3 7% 5% 4 5% 4 6% 8% 34%	1520
	11th to 20th	Night	12% 8% 2 7% 4 4 5% 4 4 7% 43%	1520
	21st to end	Night	18% 6% 2 7% 5% 4 4 3 6% 8% 37%	1520
July	1st to 10th	Night	9% 7% 3 8% 6% 6% 6% 4 6% 6% 38%	2520
	11th to 20th	Night	12% 6% 2 7% 5% 4 4 4 5% 7% 44%	2520
	21st to end	Night	9% 6% 2 5% 5% 5% 4 4 6% 8% 46%	2739
August	1st to 10th	Night	11% 5% 2 6% 5% 4 5% 4 6% 9% 43%	2719
	11th to 20th	Night	14% 6% 3 6% 4 4 4 3 6% 7% 43%	2785
	21st to end	Night	12% 6% 2 5% 4 4 5% 4 6% 9% 43%	3402
September	1st to 10th	Night	11% 6% 2 5% 4 4 5% 4 5% 8% 46%	1900
	11th to 20th	Night	13% 6% 2 4 3 3 4 4 4 6% 51%	1900
	21st to end	Night	16% 8% 2 7% 4 3 4 3 5% 7% 41%	2178
October	1st to 10th	Night	18% 9% 3 7% 4 4 4 3 4 6% 39%	2280
	11th to 20th	Night	19% 11% 3 8% 6% 5% 4 3 5% 5% 30%	2280
	21st to end	Night	20% 13% 4 8% 5% 5% 5% 3 5% 6% 25%	2597
November	1st to 10th	Night	15% 12% 5% 7% 5% 5% 4 4 5% 6% 33%	2597
	11th to 20th	Night	16% 13% 4 10% 6% 5% 5% 3 5% 5% 27%	2800
	21st to end	Night	18% 17% 6% 10% 6% 4 4 3 5% 6% 21%	2800
December	1st to 10th	Night	17% 19% 7% 12% 7% 5% 5% 4 4 5% 16%	2800
	11th to 20th	Night	18% 17% 5% 12% 6% 4 3 3 4 5% 23%	3428
	21st to end	Night	26% 19% 5% 14% 6% 4 3 2 3 4 14%	4933

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	67% 7% 10% 9% 7% 1	2518
	11th to 20th	Day	68% 6% 8% 10% 6% 1	2520
	21st to end	Day	73% 4 6% 10% 6% 1	3007
February	1st to 10th	Day	65% 5% 9% 15% 5% 1	1710
	11th to 20th	Day	59% 4 11% 15% 9% 1	1672
	21st to end	Day	61% 6% 10% 12% 10% 2	1517
March	1st to 10th	Day	60% 4 10% 13% 12% 1	3242
	11th to 20th	Day	57% 6% 11% 16% 9% 2	3480
	21st to end	Day	42% 4 8% 24% 17% 4	3937
April	1st to 10th	Day	56% 5% 7% 18% 12% 3	2280
	11th to 20th	Day	51% 5% 6% 21% 15% 2	2254
	21st to end	Day	54% 4 8% 16% 15% 3	2437
May	1st to 10th	Day	50% 6% 9% 21% 12% 2	4424
	11th to 20th	Day	48% 9% 12% 20% 10% 1	4402
	21st to end	Day	42% 7% 12% 20% 15% 2	4837
June	1st to 10th	Day	54% 6% 10% 19% 11% 1	2660
	11th to 20th	Day	44% 7% 11% 23% 13% 3	2660
	21st to end	Day	49% 7% 11% 21% 11% 1	2660
July	1st to 10th	Day	44% 7% 14% 23% 11% 1	4370
	11th to 20th	Day	38% 9% 14% 29% 10%	4365
	21st to end	Day	37% 8% 11% 32% 12%	4661
August	1st to 10th	Day	48% 7% 13% 22% 10%	4193
	11th to 20th	Day	45% 7% 14% 26% 7% 1	4083
	21st to end	Day	38% 7% 15% 29% 10% 1	4222
September	1st to 10th	Day	42% 7% 13% 27% 11%	2280
	11th to 20th	Day	37% 7% 12% 29% 15%	2280
	21st to end	Day	47% 7% 13% 23% 11%	2000
October	1st to 10th	Day	48% 6% 10% 28% 8%	3160
	11th to 20th	Day	48% 6% 13% 22% 11% 1	3140
	21st to end	Day	56% 6% 14% 18% 6%	3277
November	1st to 10th	Day	51% 7% 14% 21% 7% 1	1696
	11th to 20th	Day	57% 6% 12% 14% 10% 1	1600
	21st to end	Day	68% 7% 9% 10% 6% 1	1600
December	1st to 10th	Day	73% 6% 8% 9% 3	1600
	11th to 20th	Day	62% 6% 11% 13% 7%	1986
	21st to end	Day	74% 3 6% 14% 4	2796
January	1st to 10th	Night	69% 6% 11% 11% 3	4429
	11th to 20th	Night	66% 7% 12% 11% 4 1	4440
	21st to end	Night	70% 5% 9% 9% 7% 1	4646
February	1st to 10th	Night	61% 6% 10% 15% 7% 1	2470
	11th to 20th	Night	58% 4 10% 19% 8% 1	2405
	21st to end	Night	55% 6% 9% 19% 10% 1	1937
March	1st to 10th	Night	58% 3 10% 18% 10% 1	3606
	11th to 20th	Night	59% 6% 12% 16% 7% 1	3480
	21st to end	Night	45% 7% 9% 22% 15% 3	3695
April	1st to 10th	Night	54% 5% 7% 20% 13% 2	1900
	11th to 20th	Night	49% 5% 8% 23% 15% 1	1875
	21st to end	Night	52% 6% 8% 17% 16% 2	1759
May	1st to 10th	Night	49% 6% 10% 22% 11% 2	2534
	11th to 20th	Night	43% 11% 11% 24% 10% 1	2496
	21st to end	Night	39% 8% 13% 22% 16% 2	2739
June	1st to 10th	Night	45% 7% 13% 23% 11% 1	1520
	11th to 20th	Night	39% 7% 10% 25% 16% 2	1520
	21st to end	Night	44% 7% 16% 20% 13% 1	1520
July	1st to 10th	Night	42% 9% 14% 19% 14% 1	2480
	11th to 20th	Night	37% 6% 12% 34% 10%	2472
	21st to end	Night	35% 8% 15% 29% 14%	2651
August	1st to 10th	Night	37% 7% 15% 27% 12% 2	2709
	11th to 20th	Night	38% 7% 16% 30% 9% 1	2812
	21st to end	Night	35% 7% 16% 29% 10% 2	3402
September	1st to 10th	Night	35% 7% 14% 29% 14% 1	1900
	11th to 20th	Night	34% 7% 13% 34% 11% 1	1900
	21st to end	Night	42% 7% 11% 30% 10% 1	2178
October	1st to 10th	Night	40% 5% 12% 29% 15%	3800
	11th to 20th	Night	46% 6% 16% 21% 11%	3779
	21st to end	Night	51% 7% 16% 20% 6%	4270
November	1st to 10th	Night	50% 6% 14% 20% 9%	2597
	11th to 20th	Night	57% 7% 10% 18% 8% 1	2800
	21st to end	Night	63% 7% 11% 15% 4	2800
December	1st to 10th	Night	69% 6% 10% 11% 3	2800
	11th to 20th	Night	64% 5% 9% 13% 8% 1	3428
	21st to end	Night	76% 4 6% 11% 3	4933

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	26% 22% 36% 12% 4 1	180
	11th to 20th	Day	28% 21% 35% 12% 4	180
	21st to end	Day	27% 22% 32% 15% 3	267
February	1st to 10th	Day	31% 28% 29% 9% 4	270
	11th to 20th	Day	30% 27% 38% 4 1	270
	21st to end	Day	35% 24% 33% 8% 1	329
March	1st to 10th	Day	27% 23% 34% 13% 3	460
	11th to 20th	Day	29% 20% 32% 15% 3	460
	21st to end	Day	32% 24% 28% 11% 5% 1	506
April	1st to 10th	Day	32% 22% 28% 13% 5%	460
	11th to 20th	Day	35% 21% 21% 13% 9% 1	452
	21st to end	Day	32% 22% 28% 12% 5% 1	460
May	1st to 10th	Day	26% 20% 28% 17% 6% 3	463
	11th to 20th	Day	21% 17% 32% 21% 7% 2	487
	21st to end	Day	21% 16% 34% 18% 9% 2	529
June	1st to 10th	Day	25% 14% 36% 17% 7%	490
	11th to 20th	Day	17% 18% 30% 23% 10% 2	490
	21st to end	Day	21% 14% 35% 18% 10% 2	490
July	1st to 10th	Day	12% 9% 34% 34% 9% 2	485
	11th to 20th	Day	14% 13% 33% 25% 12% 2	484
	21st to end	Day	15% 9% 36% 27% 10% 3	532
August	1st to 10th	Day	16% 10% 32% 27% 10% 4	486
	11th to 20th	Day	16% 9% 31% 25% 15% 5%	479
	21st to end	Day	15% 13% 30% 26% 11% 5%	539
September	1st to 10th	Day	19% 13% 30% 20% 13% 5%	490
	11th to 20th	Day	13% 11% 25% 25% 15% 11%	490
	21st to end	Day	20% 16% 27% 22% 11% 5%	490
October	1st to 10th	Day	27% 18% 24% 18% 9% 4	490
	11th to 20th	Day	28% 21% 30% 13% 5% 1	490
	21st to end	Day	32% 18% 29% 16% 4	492
November	1st to 10th	Day	30% 18% 30% 16% 5%	330
	11th to 20th	Day	29% 21% 34% 11% 5% 2	200
	21st to end	Day	31% 27% 31% 9% 3 1	200
December	1st to 10th	Day	29% 20% 37% 13% 2	200
	11th to 20th	Day	32% 34% 23% 9% 2 2	200
	21st to end	Day	32% 27% 25% 11% 3 1	204
January	1st to 10th	Night	26% 21% 34% 14% 4	760
	11th to 20th	Night	27% 19% 31% 17% 5% 1	760
	21st to end	Night	18% 19% 36% 22% 5% 1	836
February	1st to 10th	Night	21% 23% 36% 18% 3	760
	11th to 20th	Night	21% 24% 38% 14% 3	743
	21st to end	Night	23% 23% 33% 18% 3	628
March	1st to 10th	Night	24% 22% 33% 17% 4	760
	11th to 20th	Night	26% 20% 33% 18% 3 1	760
	21st to end	Night	22% 19% 32% 20% 6% 1	836
April	1st to 10th	Night	30% 16% 30% 19% 4	760
	11th to 20th	Night	25% 21% 29% 17% 7%	751
	21st to end	Night	24% 17% 26% 23% 9%	619
May	1st to 10th	Night	24% 9% 29% 28% 9% 1	394
	11th to 20th	Night	21% 11% 34% 27% 7%	374
	21st to end	Night	15% 11% 33% 30% 11%	411
June	1st to 10th	Night	17% 9% 37% 28% 8% 1	380
	11th to 20th	Night	18% 10% 33% 29% 10% 1	380
	21st to end	Night	19% 11% 28% 30% 12% 1	380
July	1st to 10th	Night	9% 9% 35% 35% 12% 1	370
	11th to 20th	Night	11% 7% 29% 39% 13% 1	368
	21st to end	Night	10% 5% 33% 40% 11% 1	416
August	1st to 10th	Night	10% 5% 28% 38% 18% 1	500
	11th to 20th	Night	9% 6% 25% 38% 19% 3	564
	21st to end	Night	14% 8% 30% 30% 16% 2	788
September	1st to 10th	Night	14% 9% 32% 28% 15% 2	760
	11th to 20th	Night	16% 8% 24% 29% 20% 4	760
	21st to end	Night	21% 11% 22% 26% 16% 3	760
October	1st to 10th	Night	23% 14% 28% 22% 12% 2	760
	11th to 20th	Night	26% 17% 30% 19% 8% 1	760
	21st to end	Night	28% 17% 30% 20% 5%	836
November	1st to 10th	Night	25% 18% 28% 23% 6% 1	780
	11th to 20th	Night	26% 20% 30% 15% 8% 1	800
	21st to end	Night	31% 19% 26% 20% 4	800
December	1st to 10th	Night	28% 20% 33% 15% 4	800
	11th to 20th	Night	27% 24% 30% 17% 2 1	800
	21st to end	Night	34% 17% 31% 15% 3	851

Page generated at 2024-12-21 04:13:50. Version ac07

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