High Point State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the High Point State Park clear sky chart from 2005-11-06 to 2024-11-08.

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	17% 7% 3 6% 5% 4 5% 4 5% 7% 37%	101415
	Night	17% 7% 2 6% 4 4 4 3 5% 7% 39%	97699
Transparency	Day	24% 48% 7% 13% 8% 1	104934
	Night	24% 47% 7% 13% 8% 1	102256
Seeing	Day	24% 17% 29% 19% 9% 3	14918
	Night	21% 16% 29% 25% 9% 1	24078

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	15% 9% 3 6% 4 3 4 3 5% 5% 43%	2517
	11th to 20th	Day	14% 11% 5% 10% 6% 5% 4 4 5% 5% 32%	2520
	21st to end	Day	22% 11% 4 6% 4 4 4 3 5% 5% 31%	3041
February	1st to 10th	Day	16% 8% 4 8% 5% 5% 5% 4 5% 6% 34%	1710
	11th to 20th	Day	14% 8% 3 6% 5% 5% 4 4 5% 6% 40%	1806
	21st to end	Day	19% 9% 3 8% 4 4 4 2 5% 6% 35%	1570
March	1st to 10th	Day	26% 10% 3 7% 4 4 3 2 3 5% 34%	3116
	11th to 20th	Day	10% 8% 3 8% 6% 5% 5% 4 6% 7% 40%	3406
	21st to end	Day	20% 9% 2 6% 4 4 3 3 4 5% 40%	4092
April	1st to 10th	Day	17% 9% 2 6% 5% 5% 4 4 5% 6% 37%	2280
	11th to 20th	Day	18% 7% 2 6% 4 5% 4 3 4 6% 40%	2254
	21st to end	Day	18% 6% 3 7% 5% 5% 5% 4 5% 6% 38%	2280
May	1st to 10th	Day	27% 8% 2 6% 4 4 4 3 4 7% 31%	4191
	11th to 20th	Day	22% 9% 3 7% 5% 4 6% 4 5% 6% 30%	4398
	21st to end	Day	13% 5% 2 5% 4 4 5% 4 7% 9% 42%	4837
June	1st to 10th	Day	15% 6% 2 7% 6% 5% 6% 4 6% 9% 35%	2660
	11th to 20th	Day	16% 6% 3 6% 5% 5% 5% 5% 7% 9% 35%	2660
	21st to end	Day	13% 6% 3 8% 5% 5% 5% 4 6% 10% 37%	2660
July	1st to 10th	Day	10% 6% 2 8% 6% 5% 6% 5% 7% 10% 34%	4440
	11th to 20th	Day	10% 7% 2 6% 5% 5% 5% 5% 7% 11% 37%	4440
	21st to end	Day	14% 8% 3 8% 6% 5% 5% 4 6% 8% 34%	4814
August	1st to 10th	Day	22% 6% 2 7% 5% 5% 5% 4 7% 8% 29%	4202
	11th to 20th	Day	14% 5% 2 6% 4 5% 5% 4 6% 8% 39%	3736
	21st to end	Day	14% 6% 2 5% 3 3 4 3 6% 10% 45%	4180
September	1st to 10th	Day	15% 6% 2 6% 4 4 4 4 5% 8% 42%	2280
	11th to 20th	Day	14% 5% 1 5% 3 4 4 3 5% 7% 49%	2228
	21st to end	Day	18% 6% 2 6% 4 5% 4 4 5% 6% 39%	2090
October	1st to 10th	Day	21% 6% 3 6% 4 4 3 4 5% 7% 39%	1933
	11th to 20th	Day	14% 7% 2 5% 4 4 5% 4 5% 7% 42%	1900
	21st to end	Day	22% 6% 2 5% 4 4 4 4 5% 7% 37%	1964
November	1st to 10th	Day	13% 7% 2 4 3 4 3 2 5% 6% 50%	1734
	11th to 20th	Day	19% 7% 2 5% 3 3 3 4 6% 6% 43%	1710
	21st to end	Day	17% 7% 2 5% 5% 4 5% 5% 5% 7% 39%	1568
December	1st to 10th	Day	18% 9% 3 7% 5% 3 4 4 6% 7% 33%	1520
	11th to 20th	Day	21% 7% 3 6% 4 3 4 3 6% 6% 36%	1906
	21st to end	Day	18% 12% 5% 10% 6% 5% 5% 4 4 6% 25%	2772
January	1st to 10th	Night	16% 8% 2 6% 4 4 4 3 6% 7% 41%	4429
	11th to 20th	Night	14% 8% 4 9% 5% 4 4 3 5% 6% 37%	4440
	21st to end	Night	23% 11% 3 7% 4 4 4 3 5% 5% 31%	4614
February	1st to 10th	Night	16% 9% 3 6% 4 5% 4 4 4 7% 39%	2470
	11th to 20th	Night	15% 7% 3 6% 5% 4 5% 3 6% 6% 39%	2258
	21st to end	Night	18% 8% 2 7% 4 4 4 3 5% 5% 39%	1884
March	1st to 10th	Night	23% 12% 2 6% 4 3 3 3 4 5% 35%	3724
	11th to 20th	Night	12% 7% 3 5% 4 4 5% 4 5% 7% 42%	3549
	21st to end	Night	16% 9% 3 7% 4 3 3 3 5% 6% 40%	3540
April	1st to 10th	Night	17% 9% 3 8% 5% 5% 4 3 5% 7% 35%	1900
	11th to 20th	Night	18% 7% 2 6% 6% 4 5% 3 5% 6% 38%	1875
	21st to end	Night	19% 7% 2 6% 4 4 4 3 6% 5% 41%	1900
May	1st to 10th	Night	27% 8% 3 6% 3 3 4 3 5% 7% 31%	2776
	11th to 20th	Night	24% 10% 2 6% 4 4 3 3 5% 6% 32%	2495
	21st to end	Night	13% 6% 2 6% 5% 4 4 4 6% 9% 39%	2738
June	1st to 10th	Night	16% 6% 2 5% 4 5% 4 3 4 8% 42%	1520
	11th to 20th	Night	13% 7% 2 4 4 5% 5% 4 6% 8% 42%	1520
	21st to end	Night	12% 4 2 6% 3 4 4 4 6% 10% 45%	1520
July	1st to 10th	Night	11% 5% 2 6% 5% 5% 6% 4 6% 10% 39%	2520
	11th to 20th	Night	11% 6% 2 6% 4 5% 6% 4 7% 10% 40%	2520
	21st to end	Night	17% 6% 2 5% 5% 4 5% 4 5% 8% 37%	2739
August	1st to 10th	Night	21% 6% 2 7% 4 4 4 4 6% 7% 34%	2723
	11th to 20th	Night	14% 7% 2 7% 4 5% 4 4 4 6% 42%	3059
	21st to end	Night	12% 5% 2 5% 3 4 4 3 5% 8% 49%	3476
September	1st to 10th	Night	16% 5% 2 5% 3 4 4 3 5% 7% 46%	1900
	11th to 20th	Night	13% 5% 2 5% 3 3 4 2 4 7% 52%	1952
	21st to end	Night	17% 6% 3 6% 4 3 4 3 4 6% 43%	2090
October	1st to 10th	Night	22% 6% 3 4 4 4 3 3 4 6% 42%	2242
	11th to 20th	Night	18% 5% 2 5% 3 3 3 3 4 6% 47%	2280
	21st to end	Night	22% 6% 2 4 3 2 3 3 5% 6% 42%	2632
November	1st to 10th	Night	13% 6% 2 5% 3 3 4 3 5% 6% 49%	2505
	11th to 20th	Night	19% 7% 2 5% 3 3 3 3 5% 6% 44%	2470
	21st to end	Night	14% 7% 2 6% 5% 4 4 4 5% 7% 43%	2607
December	1st to 10th	Night	19% 8% 3 6% 5% 4 4 3 6% 7% 35%	2660
	11th to 20th	Night	19% 8% 2 6% 5% 4 5% 4 6% 6% 36%	3288
	21st to end	Night	22% 10% 4 7% 5% 4 4 3 5% 6% 31%	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	26% 38% 8% 21% 5% 2	2518
	11th to 20th	Day	33% 39% 5% 15% 6% 1	2520
	21st to end	Day	37% 41% 7% 10% 4 1	3041
February	1st to 10th	Day	19% 66% 6% 7% 3	1710
	11th to 20th	Day	15% 64% 3 10% 8% 1	1815
	21st to end	Day	17% 66% 4 9% 4 1	1570
March	1st to 10th	Day	37% 41% 4 12% 4 1	3119
	11th to 20th	Day	20% 45% 10% 19% 5% 1	3406
	21st to end	Day	27% 41% 5% 7% 16% 3	4092
April	1st to 10th	Day	20% 65% 2 6% 5% 1	2280
	11th to 20th	Day	15% 66% 4 8% 8%	2254
	21st to end	Day	18% 65% 3 9% 5% 1	2280
May	1st to 10th	Day	35% 42% 9% 9% 5% 1	4205
	11th to 20th	Day	36% 43% 8% 11% 3	4402
	21st to end	Day	19% 44% 8% 17% 11% 1	4837
June	1st to 10th	Day	17% 66% 4 8% 6%	2660
	11th to 20th	Day	14% 66% 5% 9% 6%	2660
	21st to end	Day	15% 65% 4 9% 7%	2660
July	1st to 10th	Day	29% 40% 8% 14% 9% 1	4370
	11th to 20th	Day	26% 40% 11% 15% 9%	4365
	21st to end	Day	33% 37% 8% 12% 9% 1	4661
August	1st to 10th	Day	35% 39% 9% 12% 4	4188
	11th to 20th	Day	24% 39% 11% 20% 6%	3772
	21st to end	Day	19% 38% 8% 25% 10% 1	4180
September	1st to 10th	Day	15% 61% 5% 11% 7%	2280
	11th to 20th	Day	16% 60% 3 9% 10% 2	2228
	21st to end	Day	19% 61% 5% 9% 6% 1	2090
October	1st to 10th	Day	25% 38% 4 12% 18% 4	3206
	11th to 20th	Day	17% 38% 5% 19% 19% 3	3140
	21st to end	Day	12% 37% 14% 20% 15% 3	3215
November	1st to 10th	Day	18% 57% 6% 11% 6% 1	1734
	11th to 20th	Day	14% 60% 4 10% 10% 2	1710
	21st to end	Day	16% 61% 6% 12% 4 1	1568
December	1st to 10th	Day	21% 60% 7% 6% 5% 1	1520
	11th to 20th	Day	25% 50% 7% 13% 5% 1	1906
	21st to end	Day	41% 41% 4 10% 4	2772
January	1st to 10th	Night	26% 39% 7% 19% 6% 3	4429
	11th to 20th	Night	30% 39% 9% 15% 8% 1	4440
	21st to end	Night	37% 41% 6% 10% 5% 1	4614
February	1st to 10th	Night	15% 65% 6% 9% 4 1	2470
	11th to 20th	Night	15% 64% 3 8% 8% 2	2260
	21st to end	Night	15% 65% 4 8% 6% 2	1884
March	1st to 10th	Night	35% 42% 5% 10% 7% 1	3734
	11th to 20th	Night	19% 43% 10% 18% 8% 1	3550
	21st to end	Night	29% 41% 4 10% 14% 3	3540
April	1st to 10th	Night	18% 65% 3 8% 5%	1900
	11th to 20th	Night	15% 66% 4 8% 8%	1875
	21st to end	Night	16% 65% 4 9% 6% 1	1900
May	1st to 10th	Night	34% 42% 7% 14% 3	2782
	11th to 20th	Night	36% 43% 10% 8% 3	2496
	21st to end	Night	24% 43% 9% 17% 7% 1	2739
June	1st to 10th	Night	13% 66% 3 9% 9%	1520
	11th to 20th	Night	13% 66% 6% 10% 4	1520
	21st to end	Night	13% 63% 5% 12% 7%	1520
July	1st to 10th	Night	26% 40% 11% 12% 10% 1	2480
	11th to 20th	Night	25% 38% 10% 18% 8%	2472
	21st to end	Night	32% 37% 8% 10% 11% 1	2651
August	1st to 10th	Night	35% 40% 10% 10% 4 1	2713
	11th to 20th	Night	28% 38% 9% 20% 5%	3089
	21st to end	Night	18% 38% 7% 27% 9%	3476
September	1st to 10th	Night	14% 60% 5% 12% 8% 1	1900
	11th to 20th	Night	13% 60% 5% 9% 12% 2	1952
	21st to end	Night	19% 59% 4 9% 8% 1	2090
October	1st to 10th	Night	26% 37% 6% 16% 13% 1	3736
	11th to 20th	Night	13% 37% 6% 20% 21% 3	3779
	21st to end	Night	16% 37% 11% 22% 14% 1	4331
November	1st to 10th	Night	17% 58% 6% 10% 8% 1	2505
	11th to 20th	Night	14% 60% 5% 9% 10% 2	2470
	21st to end	Night	16% 60% 7% 12% 5% 1	2607
December	1st to 10th	Night	21% 61% 5% 10% 4	2660
	11th to 20th	Night	23% 50% 7% 10% 8% 2	3288
	21st to end	Night	35% 40% 8% 12% 5%	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	35% 22% 29% 12% 2	180
	11th to 20th	Day	38% 27% 27% 7% 2	180
	21st to end	Day	28% 29% 30% 8% 4 1	276
February	1st to 10th	Day	33% 27% 30% 9% 1	270
	11th to 20th	Day	35% 28% 29% 7% 1	414
	21st to end	Day	32% 24% 32% 9% 2	382
March	1st to 10th	Day	28% 26% 28% 14% 4	460
	11th to 20th	Day	27% 27% 29% 13% 3 1	460
	21st to end	Day	32% 22% 30% 9% 5% 2	506
April	1st to 10th	Day	33% 22% 27% 13% 5% 1	460
	11th to 20th	Day	28% 24% 29% 11% 6% 2	452
	21st to end	Day	30% 18% 33% 13% 4 2	460
May	1st to 10th	Day	35% 19% 23% 14% 6% 2	463
	11th to 20th	Day	22% 20% 31% 18% 8% 1	487
	21st to end	Day	20% 10% 30% 26% 12% 3	529
June	1st to 10th	Day	19% 13% 33% 22% 11% 1	490
	11th to 20th	Day	19% 15% 26% 26% 13% 1	490
	21st to end	Day	14% 14% 35% 25% 10% 1	490
July	1st to 10th	Day	14% 10% 29% 27% 16% 5%	485
	11th to 20th	Day	11% 9% 28% 32% 18% 2	484
	21st to end	Day	14% 9% 36% 26% 13% 2	532
August	1st to 10th	Day	13% 8% 28% 30% 14% 6%	486
	11th to 20th	Day	15% 8% 27% 29% 16% 5%	479
	21st to end	Day	13% 11% 29% 25% 14% 7%	539
September	1st to 10th	Day	19% 12% 26% 22% 14% 7%	490
	11th to 20th	Day	15% 9% 27% 21% 16% 11%	490
	21st to end	Day	25% 11% 26% 23% 11% 5%	490
October	1st to 10th	Day	26% 13% 23% 21% 13% 4	490
	11th to 20th	Day	20% 17% 30% 20% 10% 2	490
	21st to end	Day	26% 18% 29% 18% 7% 1	472
November	1st to 10th	Day	21% 18% 26% 25% 7% 2	386
	11th to 20th	Day	29% 22% 25% 17% 6% 1	370
	21st to end	Day	29% 21% 32% 14% 3	228
December	1st to 10th	Day	32% 28% 26% 10% 4 1	180
	11th to 20th	Day	39% 22% 28% 8% 3	180
	21st to end	Day	30% 25% 30% 12% 4	198
January	1st to 10th	Night	22% 24% 37% 15% 3	760
	11th to 20th	Night	27% 22% 29% 20% 3	760
	21st to end	Night	21% 24% 36% 17% 2	836
February	1st to 10th	Night	24% 19% 36% 18% 2	760
	11th to 20th	Night	26% 26% 34% 13% 1	743
	21st to end	Night	29% 23% 30% 14% 3	628
March	1st to 10th	Night	25% 22% 33% 16% 3	760
	11th to 20th	Night	25% 24% 29% 18% 3 1	760
	21st to end	Night	23% 22% 34% 16% 5%	836
April	1st to 10th	Night	24% 21% 34% 16% 4	760
	11th to 20th	Night	23% 20% 32% 21% 5%	751
	21st to end	Night	23% 18% 28% 24% 6%	760
May	1st to 10th	Night	28% 14% 28% 24% 6%	538
	11th to 20th	Night	21% 11% 35% 25% 7%	374
	21st to end	Night	14% 9% 27% 38% 12%	411
June	1st to 10th	Night	17% 6% 27% 38% 12% 1	380
	11th to 20th	Night	14% 7% 30% 36% 13%	380
	21st to end	Night	12% 5% 28% 44% 11%	380
July	1st to 10th	Night	12% 6% 20% 42% 19% 1	370
	11th to 20th	Night	12% 5% 23% 43% 16% 1	368
	21st to end	Night	13% 4 25% 42% 16% 1	416
August	1st to 10th	Night	12% 3 23% 40% 21% 1	504
	11th to 20th	Night	14% 4 22% 35% 23% 2	724
	21st to end	Night	15% 6% 22% 35% 21% 1	836
September	1st to 10th	Night	17% 6% 25% 32% 16% 2	760
	11th to 20th	Night	15% 8% 23% 30% 20% 4	760
	21st to end	Night	19% 8% 24% 30% 17% 2	760
October	1st to 10th	Night	23% 10% 24% 26% 15% 1	760
	11th to 20th	Night	19% 13% 30% 30% 8%	760
	21st to end	Night	25% 15% 32% 22% 7%	836
November	1st to 10th	Night	17% 17% 33% 24% 8% 1	771
	11th to 20th	Night	25% 18% 28% 22% 7% 1	760
	21st to end	Night	20% 19% 33% 21% 6% 1	760
December	1st to 10th	Night	25% 21% 29% 18% 5%	760
	11th to 20th	Night	25% 23% 29% 21% 3	760
	21st to end	Night	27% 20% 33% 17% 2	836

Page generated at 2024-11-05 08:15:48. Version ac07

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