Highpointe Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Highpointe Observatory 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	11% 6% 2 7% 5% 5% 5% 4 6% 8% 40%	101148
	Night	12% 6% 2 6% 4 4 4 4 6% 8% 44%	98837
Transparency	Day	38% 8% 12% 17% 18% 7%	104922
	Night	35% 8% 12% 18% 18% 9%	103202
Seeing	Day	14% 9% 20% 25% 22% 10%	14895
	Night	14% 8% 22% 29% 22% 5%	24507

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	17% 7% 2 6% 3 4 3 3 6% 7% 41%	2897
	11th to 20th	Day	12% 6% 1 5% 3 3 3 3 5% 5% 53%	2985
	21st to end	Day	23% 8% 3 6% 3 2 3 2 4 5% 41%	3476
February	1st to 10th	Day	17% 9% 3 6% 5% 4 5% 3 5% 5% 38%	1900
	11th to 20th	Day	18% 7% 2 5% 4 3 3 3 4 8% 42%	1848
	21st to end	Day	17% 8% 3 7% 5% 4 3 4 5% 6% 38%	1570
March	1st to 10th	Day	23% 10% 3 7% 5% 5% 4 3 5% 6% 30%	3120
	11th to 20th	Day	15% 7% 3 8% 5% 5% 4 3 6% 8% 35%	3480
	21st to end	Day	14% 7% 3 8% 6% 4 5% 3 5% 5% 40%	4087
April	1st to 10th	Day	11% 7% 2 7% 5% 5% 5% 4 6% 6% 42%	2280
	11th to 20th	Day	15% 6% 2 7% 5% 4 5% 3 5% 7% 40%	2254
	21st to end	Day	8% 5% 2 6% 4 5% 4 4 7% 7% 48%	2280
May	1st to 10th	Day	12% 5% 2 6% 5% 5% 6% 5% 6% 10% 37%	3765
	11th to 20th	Day	14% 7% 2 7% 5% 4 5% 3 5% 7% 42%	3764
	21st to end	Day	6% 5% 3 6% 5% 6% 6% 5% 7% 10% 40%	4382
June	1st to 10th	Day	10% 5% 2 7% 6% 6% 6% 6% 8% 10% 34%	2470
	11th to 20th	Day	4 4 2 8% 7% 6% 6% 6% 8% 10% 38%	2580
	21st to end	Day	6% 5% 2 8% 8% 8% 7% 7% 9% 10% 30%	2660
July	1st to 10th	Day	7% 6% 3 9% 8% 9% 7% 6% 9% 12% 25%	4122
	11th to 20th	Day	8% 5% 3 8% 7% 7% 8% 6% 8% 11% 29%	3974
	21st to end	Day	10% 7% 3 10% 8% 7% 7% 5% 8% 11% 23%	4118
August	1st to 10th	Day	3 3 1 5% 4 5% 5% 4 5% 9% 57%	3785
	11th to 20th	Day	6% 4 2 6% 5% 6% 6% 5% 7% 11% 43%	3729
	21st to end	Day	8% 5% 3 8% 6% 6% 6% 5% 7% 8% 38%	4180
September	1st to 10th	Day	9% 6% 3 7% 7% 6% 6% 5% 6% 8% 35%	2280
	11th to 20th	Day	11% 7% 2 8% 5% 4 5% 4 6% 8% 41%	2182
	21st to end	Day	10% 4 2 5% 3 4 4 3 6% 7% 51%	2090
October	1st to 10th	Day	6% 5% 2 5% 3 4 4 4 5% 6% 56%	2078
	11th to 20th	Day	9% 4 2 6% 4 3 3 3 5% 6% 54%	1900
	21st to end	Day	10% 5% 2 5% 3 4 3 3 3 6% 56%	2090
November	1st to 10th	Day	11% 5% 2 6% 4 3 3 3 5% 6% 52%	1918
	11th to 20th	Day	12% 6% 2 4 3 4 3 3 4 6% 54%	1800
	21st to end	Day	14% 7% 2 6% 4 3 4 4 3 6% 48%	1800
December	1st to 10th	Day	15% 7% 3 6% 4 4 4 4 4 6% 45%	1800
	11th to 20th	Day	14% 9% 3 8% 4 4 4 3 4 5% 42%	2243
	21st to end	Day	15% 8% 2 7% 4 4 4 3 6% 7% 40%	3261
January	1st to 10th	Night	17% 8% 2 5% 3 3 3 3 5% 5% 47%	4026
	11th to 20th	Night	15% 7% 2 4 2 3 3 3 4 5% 51%	3954
	21st to end	Night	26% 9% 2 4 3 2 2 2 3 5% 42%	4180
February	1st to 10th	Night	16% 8% 3 6% 4 3 4 4 5% 7% 40%	2280
	11th to 20th	Night	20% 9% 2 6% 4 3 3 3 5% 4 42%	2218
	21st to end	Night	17% 8% 3 7% 4 4 4 3 5% 6% 38%	1884
March	1st to 10th	Night	22% 12% 3 7% 5% 4 4 3 4 5% 31%	3733
	11th to 20th	Night	13% 7% 3 7% 4 5% 5% 4 5% 7% 39%	3494
	21st to end	Night	15% 6% 2 5% 4 4 4 4 5% 6% 44%	3544
April	1st to 10th	Night	13% 7% 2 5% 4 4 4 3 5% 7% 45%	1900
	11th to 20th	Night	13% 6% 3 6% 4 3 4 3 4 8% 45%	1875
	21st to end	Night	7% 4 1 6% 3 3 3 4 6% 6% 57%	1900
May	1st to 10th	Night	12% 7% 2 6% 3 4 3 3 6% 8% 46%	3130
	11th to 20th	Night	14% 6% 2 6% 4 5% 4 3 5% 7% 43%	3129
	21st to end	Night	6% 5% 2 5% 4 5% 6% 5% 8% 11% 43%	3155
June	1st to 10th	Night	7% 5% 3 7% 6% 5% 5% 5% 8% 9% 40%	1710
	11th to 20th	Night	3 4 2 5% 5% 4 6% 6% 8% 11% 46%	1591
	21st to end	Night	5% 7% 2 6% 5% 4 5% 5% 8% 12% 40%	1520
July	1st to 10th	Night	5% 6% 3 8% 6% 6% 7% 5% 9% 12% 33%	2840
	11th to 20th	Night	7% 5% 2 7% 5% 6% 7% 6% 11% 12% 33%	2969
	21st to end	Night	6% 7% 3 10% 6% 7% 7% 5% 9% 12% 28%	3435
August	1st to 10th	Night	3 2 1 3 3 4 4 4 7% 13% 56%	3144
	11th to 20th	Night	4 3 1 5% 4 5% 7% 5% 9% 12% 44%	3100
	21st to end	Night	6% 5% 3 7% 5% 5% 6% 5% 8% 10% 40%	3476
September	1st to 10th	Night	9% 6% 2 8% 7% 6% 6% 5% 6% 9% 37%	1900
	11th to 20th	Night	10% 6% 2 6% 5% 5% 4 4 7% 8% 44%	1976
	21st to end	Night	7% 5% 2 6% 4 4 4 4 4 7% 52%	2090
October	1st to 10th	Night	7% 4 2 5% 4 3 4 3 5% 8% 56%	2097
	11th to 20th	Night	8% 4 2 5% 3 2 4 3 5% 6% 58%	2280
	21st to end	Night	12% 5% 2 5% 3 3 2 3 3 5% 58%	2508
November	1st to 10th	Night	11% 5% 1 5% 3 3 2 3 4 4 57%	2377
	11th to 20th	Night	14% 4 2 4 3 3 3 2 5% 5% 55%	2600
	21st to end	Night	13% 7% 2 5% 4 4 4 4 5% 5% 48%	2600
December	1st to 10th	Night	15% 8% 2 5% 4 3 3 3 5% 6% 46%	2600
	11th to 20th	Night	16% 7% 2 6% 4 4 4 4 5% 5% 43%	3172
	21st to end	Night	18% 8% 3 6% 3 4 3 3 4 6% 43%	4450

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	39% 5% 7% 19% 23% 8%	2898
	11th to 20th	Day	31% 5% 6% 18% 31% 9%	2985
	21st to end	Day	47% 3 5% 14% 22% 8%	3476
February	1st to 10th	Day	47% 5% 7% 13% 17% 10%	1900
	11th to 20th	Day	41% 5% 7% 15% 22% 9%	1858
	21st to end	Day	45% 6% 7% 15% 16% 10%	1570
March	1st to 10th	Day	53% 7% 9% 14% 12% 5%	3120
	11th to 20th	Day	43% 8% 9% 17% 18% 5%	3480
	21st to end	Day	43% 7% 9% 13% 20% 8%	4087
April	1st to 10th	Day	40% 7% 9% 17% 18% 10%	2280
	11th to 20th	Day	42% 7% 7% 16% 20% 8%	2254
	21st to end	Day	33% 7% 11% 21% 23% 5%	2280
May	1st to 10th	Day	35% 13% 15% 19% 15% 4	3800
	11th to 20th	Day	41% 7% 12% 17% 20% 2	3768
	21st to end	Day	33% 10% 16% 28% 11% 1	4395
June	1st to 10th	Day	41% 11% 16% 20% 10% 2	2470
	11th to 20th	Day	37% 11% 18% 19% 12% 3	2580
	21st to end	Day	43% 13% 16% 19% 8% 1	2660
July	1st to 10th	Day	46% 15% 19% 15% 4	4058
	11th to 20th	Day	43% 15% 28% 12% 2 1	3905
	21st to end	Day	51% 13% 16% 14% 5% 1	3987
August	1st to 10th	Day	23% 9% 14% 26% 26% 2	3773
	11th to 20th	Day	32% 11% 16% 26% 13% 1	3765
	21st to end	Day	41% 11% 15% 15% 15% 2	4179
September	1st to 10th	Day	44% 10% 14% 14% 12% 6%	2280
	11th to 20th	Day	41% 9% 11% 16% 16% 7%	2182
	21st to end	Day	32% 6% 12% 21% 19% 10%	2090
October	1st to 10th	Day	25% 4 8% 11% 24% 29%	3455
	11th to 20th	Day	19% 3 6% 13% 28% 30%	3140
	21st to end	Day	22% 3 5% 13% 36% 21%	3428
November	1st to 10th	Day	33% 4 8% 17% 25% 12%	1918
	11th to 20th	Day	32% 4 7% 14% 30% 14%	1800
	21st to end	Day	37% 5% 8% 16% 22% 12%	1800
December	1st to 10th	Day	41% 5% 9% 18% 19% 8%	1800
	11th to 20th	Day	44% 5% 7% 12% 23% 9%	2240
	21st to end	Day	40% 7% 9% 19% 20% 4	3261
January	1st to 10th	Night	38% 5% 7% 14% 28% 8%	4026
	11th to 20th	Night	36% 4 6% 19% 23% 12%	3954
	21st to end	Night	47% 3 4 15% 24% 7%	4180
February	1st to 10th	Night	43% 6% 8% 15% 20% 10%	2280
	11th to 20th	Night	45% 5% 5% 12% 21% 11%	2219
	21st to end	Night	45% 7% 8% 14% 13% 13%	1884
March	1st to 10th	Night	52% 7% 10% 12% 13% 6%	3733
	11th to 20th	Night	41% 8% 10% 15% 19% 7%	3494
	21st to end	Night	38% 8% 11% 18% 19% 6%	3544
April	1st to 10th	Night	39% 6% 10% 15% 19% 10%	1900
	11th to 20th	Night	38% 5% 10% 19% 18% 9%	1875
	21st to end	Night	26% 6% 12% 22% 27% 8%	1900
May	1st to 10th	Night	33% 10% 15% 21% 17% 4	3160
	11th to 20th	Night	38% 8% 13% 22% 17% 1	3130
	21st to end	Night	27% 12% 21% 24% 13% 3	3163
June	1st to 10th	Night	35% 11% 18% 22% 11% 2	1710
	11th to 20th	Night	26% 13% 20% 28% 11% 3	1591
	21st to end	Night	33% 11% 21% 23% 10% 3	1520
July	1st to 10th	Night	37% 18% 24% 16% 5% 1	2795
	11th to 20th	Night	36% 18% 33% 10% 3 1	2915
	21st to end	Night	45% 17% 17% 17% 3	3325
August	1st to 10th	Night	17% 10% 21% 29% 22% 1	3132
	11th to 20th	Night	26% 15% 21% 26% 11% 1	3130
	21st to end	Night	37% 13% 16% 19% 12% 4	3476
September	1st to 10th	Night	40% 10% 18% 13% 13% 6%	1900
	11th to 20th	Night	35% 10% 16% 16% 14% 9%	1976
	21st to end	Night	31% 7% 11% 24% 16% 11%	2090
October	1st to 10th	Night	27% 6% 7% 12% 23% 26%	3500
	11th to 20th	Night	17% 4 5% 19% 21% 33%	3779
	21st to end	Night	20% 4 5% 12% 37% 23%	4120
November	1st to 10th	Night	29% 4 9% 18% 25% 15%	2377
	11th to 20th	Night	31% 4 7% 14% 27% 16%	2600
	21st to end	Night	36% 5% 7% 19% 19% 14%	2600
December	1st to 10th	Night	39% 5% 9% 20% 21% 7%	2600
	11th to 20th	Night	42% 5% 7% 13% 23% 10%	3174
	21st to end	Night	43% 5% 9% 17% 21% 6%	4450

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% 22% 34% 16% 5% 1	270
	11th to 20th	Day	21% 20% 31% 19% 7% 1	270
	21st to end	Day	25% 26% 33% 13% 3	297
February	1st to 10th	Day	30% 21% 29% 16% 4 1	270
	11th to 20th	Day	30% 18% 33% 16% 3	270
	21st to end	Day	24% 27% 37% 11% 2	225
March	1st to 10th	Day	23% 17% 36% 20% 4	270
	11th to 20th	Day	25% 23% 27% 21% 4 1	270
	21st to end	Day	19% 16% 31% 25% 8%	454
April	1st to 10th	Day	18% 17% 32% 21% 10% 1	460
	11th to 20th	Day	22% 17% 27% 20% 11% 2	452
	21st to end	Day	9% 15% 28% 27% 18% 2	460
May	1st to 10th	Day	11% 11% 28% 25% 20% 5%	463
	11th to 20th	Day	12% 4 20% 33% 21% 10%	487
	21st to end	Day	6% 4 19% 36% 24% 11%	529
June	1st to 10th	Day	11% 2 17% 30% 25% 14%	490
	11th to 20th	Day	5% 3 11% 35% 34% 12%	600
	21st to end	Day	8% 2 13% 30% 31% 16%	680
July	1st to 10th	Day	7% 2 8% 28% 36% 19%	671
	11th to 20th	Day	7% 1 6% 20% 40% 27%	587
	21st to end	Day	10% 2 5% 22% 38% 24%	532
August	1st to 10th	Day	5% 1 8% 23% 34% 29%	486
	11th to 20th	Day	8% 1 7% 19% 38% 27%	479
	21st to end	Day	10% 2 9% 21% 33% 24%	539
September	1st to 10th	Day	10% 3 8% 27% 35% 16%	490
	11th to 20th	Day	13% 4 10% 24% 38% 11%	490
	21st to end	Day	11% 5% 13% 28% 33% 10%	490
October	1st to 10th	Day	6% 5% 21% 37% 24% 7%	478
	11th to 20th	Day	10% 7% 25% 32% 22% 4	300
	21st to end	Day	18% 10% 18% 30% 18% 5%	330
November	1st to 10th	Day	16% 9% 27% 31% 14% 2	300
	11th to 20th	Day	18% 14% 32% 22% 13% 1	300
	21st to end	Day	15% 17% 35% 21% 11% 2	300
December	1st to 10th	Day	21% 14% 33% 23% 7% 1	300
	11th to 20th	Day	23% 16% 36% 17% 7%	300
	21st to end	Day	26% 17% 27% 24% 7%	306
January	1st to 10th	Night	21% 12% 32% 28% 6%	907
	11th to 20th	Night	20% 14% 31% 29% 7%	849
	21st to end	Night	22% 15% 32% 26% 4	836
February	1st to 10th	Night	20% 13% 33% 29% 4	760
	11th to 20th	Night	25% 16% 27% 27% 5%	743
	21st to end	Night	21% 18% 37% 21% 3	628
March	1st to 10th	Night	17% 16% 33% 28% 6%	760
	11th to 20th	Night	14% 11% 38% 30% 7%	584
	21st to end	Night	14% 12% 36% 30% 9%	627
April	1st to 10th	Night	17% 12% 32% 28% 11%	570
	11th to 20th	Night	15% 11% 32% 30% 12% 1	563
	21st to end	Night	9% 6% 30% 40% 16%	570
May	1st to 10th	Night	10% 5% 27% 39% 17% 2	570
	11th to 20th	Night	9% 4 22% 39% 22% 4	561
	21st to end	Night	7% 3 18% 35% 31% 6%	617
June	1st to 10th	Night	10% 2 11% 36% 36% 5%	570
	11th to 20th	Night	3 3 9% 33% 44% 9%	570
	21st to end	Night	7% 2 10% 26% 43% 11%	570
July	1st to 10th	Night	5% 2 4 23% 52% 15%	555
	11th to 20th	Night	6% 1 3 17% 50% 23%	552
	21st to end	Night	4 1 6% 25% 47% 17%	624
August	1st to 10th	Night	3 1 4 20% 51% 22%	567
	11th to 20th	Night	7% 1 5% 18% 49% 20%	564
	21st to end	Night	8% 2 5% 22% 43% 19%	627
September	1st to 10th	Night	10% 3 9% 26% 40% 13%	570
	11th to 20th	Night	11% 3 9% 28% 41% 8%	646
	21st to end	Night	9% 2 14% 31% 37% 6%	760
October	1st to 10th	Night	8% 3 19% 33% 34% 4	760
	11th to 20th	Night	10% 4 22% 36% 26% 3	760
	21st to end	Night	14% 7% 21% 33% 23% 2	836
November	1st to 10th	Night	13% 7% 20% 38% 20% 3	780
	11th to 20th	Night	16% 8% 27% 34% 15% 1	800
	21st to end	Night	17% 8% 28% 32% 14% 1	800
December	1st to 10th	Night	18% 13% 28% 29% 13%	800
	11th to 20th	Night	21% 7% 32% 31% 9%	800
	21st to end	Night	25% 12% 28% 28% 7%	851

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