Wolf Point
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wolf Point 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	8% 7% 3 7% 5% 4 5% 4 6% 8% 44%	141213
	Night	7% 7% 3 8% 5% 4 5% 4 6% 8% 44%	138377
Transparency	Day	36% 7% 15% 26% 13% 2	135859
	Night	37% 7% 16% 25% 13% 2	134754
Seeing	Day	10% 9% 29% 31% 17% 4	18038
	Night	10% 7% 31% 39% 13% 1	27790

By Month

Percentage Cloud Cover SW (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	4 11% 4 10% 7% 7% 7% 5% 7% 9% 27%	4720
	11th to 20th	Day	4 8% 3 11% 7% 6% 7% 5% 8% 9% 32%	4740
	21st to end	Day	4 10% 4 8% 5% 5% 6% 4 6% 7% 40%	5188
February	1st to 10th	Day	8% 12% 3 12% 6% 6% 6% 5% 6% 8% 30%	1859
	11th to 20th	Day	6% 12% 4 10% 7% 6% 5% 5% 7% 7% 30%	1845
	21st to end	Day	5% 10% 4 10% 6% 6% 5% 5% 7% 9% 34%	1693
March	1st to 10th	Day	4 9% 5% 12% 6% 5% 4 3 5% 8% 39%	4600
	11th to 20th	Day	7% 8% 3 7% 5% 5% 5% 5% 7% 9% 38%	5007
	21st to end	Day	11% 14% 5% 9% 6% 6% 5% 4 6% 7% 27%	5951
April	1st to 10th	Day	8% 9% 3 8% 6% 5% 6% 4 6% 7% 39%	2520
	11th to 20th	Day	12% 11% 4 8% 5% 5% 5% 3 6% 7% 34%	2444
	21st to end	Day	12% 9% 3 7% 5% 4 5% 5% 6% 7% 37%	2677
May	1st to 10th	Day	14% 7% 2 6% 4 4 4 3 5% 7% 44%	6340
	11th to 20th	Day	19% 8% 2 6% 4 5% 5% 4 6% 8% 34%	6298
	21st to end	Day	12% 5% 2 6% 4 4 4 4 6% 8% 44%	6925
June	1st to 10th	Day	11% 5% 2 5% 5% 5% 5% 4 6% 8% 45%	2800
	11th to 20th	Day	11% 5% 2 5% 4 5% 5% 4 6% 8% 44%	2883
	21st to end	Day	6% 4 2 4 4 5% 4 5% 7% 9% 52%	3000
July	1st to 10th	Day	4 3 1 5% 5% 5% 5% 5% 8% 9% 50%	6571
	11th to 20th	Day	7% 3 1 4 3 3 5% 4 6% 9% 55%	6340
	21st to end	Day	5% 3 1 4 4 4 4 4 6% 8% 56%	6903
August	1st to 10th	Day	8% 4 2 5% 4 4 4 3 5% 8% 53%	6232
	11th to 20th	Day	4 3 2 4 3 4 4 3 6% 8% 59%	5944
	21st to end	Day	6% 3 1 4 3 4 4 3 5% 6% 62%	6072
September	1st to 10th	Day	10% 4 2 4 3 3 4 2 5% 7% 56%	2400
	11th to 20th	Day	10% 5% 2 5% 4 4 3 4 5% 8% 51%	2400
	21st to end	Day	11% 5% 1 5% 3 3 3 3 5% 7% 54%	2146
October	1st to 10th	Day	8% 4 2 5% 3 3 3 2 5% 6% 59%	3270
	11th to 20th	Day	7% 5% 2 6% 3 4 4 3 4 8% 54%	3233
	21st to end	Day	6% 5% 2 5% 3 3 4 4 6% 9% 54%	3190
November	1st to 10th	Day	11% 8% 3 7% 5% 3 4 4 6% 6% 42%	1764
	11th to 20th	Day	6% 7% 4 9% 5% 4 4 4 6% 8% 45%	1680
	21st to end	Day	6% 9% 4 10% 5% 6% 6% 4 7% 9% 35%	1680
December	1st to 10th	Day	5% 9% 6% 11% 6% 5% 5% 4 6% 8% 35%	2700
	11th to 20th	Day	7% 14% 5% 10% 4 5% 5% 4 6% 6% 33%	3106
	21st to end	Day	4 7% 3 9% 6% 7% 6% 4 7% 10% 39%	4092
January	1st to 10th	Night	3 11% 5% 11% 6% 6% 7% 5% 8% 9% 31%	8201
	11th to 20th	Night	3 8% 4 11% 6% 6% 6% 4 7% 8% 37%	8250
	21st to end	Night	3 11% 4 10% 5% 5% 6% 4 6% 8% 38%	9026
February	1st to 10th	Night	8% 10% 4 10% 7% 6% 5% 4 6% 7% 33%	2781
	11th to 20th	Night	5% 10% 4 9% 5% 6% 6% 5% 7% 8% 35%	2662
	21st to end	Night	5% 9% 4 8% 6% 4 5% 4 6% 7% 41%	2112
March	1st to 10th	Night	6% 8% 2 7% 4 4 4 3 7% 10% 44%	5494
	11th to 20th	Night	5% 6% 3 8% 4 4 5% 4 7% 10% 44%	5205
	21st to end	Night	12% 14% 6% 10% 6% 5% 6% 4 7% 7% 23%	5249
April	1st to 10th	Night	8% 9% 4 8% 5% 4 4 4 6% 7% 41%	2100
	11th to 20th	Night	11% 8% 4 8% 5% 5% 4 4 6% 6% 38%	2037
	21st to end	Night	11% 8% 3 7% 4 4 4 5% 6% 8% 41%	1720
May	1st to 10th	Night	10% 5% 2 6% 4 4 5% 3 5% 6% 49%	3640
	11th to 20th	Night	17% 7% 2 6% 5% 4 5% 4 7% 8% 33%	3617
	21st to end	Night	11% 5% 2 6% 5% 4 5% 3 6% 7% 47%	3972
June	1st to 10th	Night	9% 6% 2 6% 4 4 4 5% 5% 10% 45%	1600
	11th to 20th	Night	9% 4 2 5% 4 5% 5% 4 6% 9% 46%	1510
	21st to end	Night	5% 4 2 5% 4 4 4 3 7% 9% 54%	1400
July	1st to 10th	Night	5% 4 2 5% 4 4 4 4 5% 8% 54%	3364
	11th to 20th	Night	7% 3 1 5% 3 3 4 3 5% 7% 59%	3640
	21st to end	Night	5% 3 1 4 3 4 5% 5% 6% 9% 55%	3970
August	1st to 10th	Night	8% 4 2 6% 4 4 5% 4 5% 7% 51%	3580
	11th to 20th	Night	4 2 1 4 3 3 4 4 6% 10% 58%	3890
	21st to end	Night	6% 4 2 5% 3 4 4 3 5% 6% 58%	4905
September	1st to 10th	Night	7% 3 1 4 3 2 3 4 4 8% 60%	2000
	11th to 20th	Night	9% 4 1 4 3 3 4 3 6% 7% 56%	2000
	21st to end	Night	10% 4 2 4 3 3 3 3 5% 7% 57%	2249
October	1st to 10th	Night	7% 3 2 4 3 3 3 3 5% 7% 60%	3920
	11th to 20th	Night	7% 5% 2 4 4 4 4 3 6% 8% 53%	3898
	21st to end	Night	6% 6% 2 5% 4 4 4 4 6% 8% 51%	4595
November	1st to 10th	Night	11% 9% 3 6% 4 3 5% 4 5% 7% 43%	2751
	11th to 20th	Night	6% 8% 3 9% 5% 5% 5% 4 6% 8% 42%	2940
	21st to end	Night	5% 9% 4 8% 5% 5% 5% 4 6% 8% 40%	2940
December	1st to 10th	Night	7% 13% 5% 11% 6% 5% 5% 4 6% 7% 31%	4710
	11th to 20th	Night	5% 12% 5% 11% 6% 5% 4 4 6% 7% 33%	5321
	21st to end	Night	5% 9% 3 8% 5% 4 5% 4 6% 8% 44%	7128

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	49% 9% 16% 19% 6%	4723
	11th to 20th	Day	44% 8% 19% 16% 13% 1	4740
	21st to end	Day	41% 8% 21% 25% 5%	5188
February	1st to 10th	Day	51% 7% 14% 18% 10%	1859
	11th to 20th	Day	51% 8% 14% 18% 9%	1854
	21st to end	Day	45% 9% 18% 20% 8% 2	1693
March	1st to 10th	Day	43% 6% 14% 28% 9%	4600
	11th to 20th	Day	39% 8% 19% 27% 8%	5007
	21st to end	Day	54% 8% 18% 15% 5%	5951
April	1st to 10th	Day	42% 8% 16% 22% 10% 1	2520
	11th to 20th	Day	47% 8% 14% 21% 9%	2447
	21st to end	Day	44% 8% 13% 23% 11%	2677
May	1st to 10th	Day	37% 8% 12% 25% 16% 2	6340
	11th to 20th	Day	44% 8% 14% 24% 9% 1	6302
	21st to end	Day	34% 9% 14% 27% 16% 1	6926
June	1st to 10th	Day	35% 8% 17% 26% 13% 2	2800
	11th to 20th	Day	35% 8% 18% 25% 12% 3	2883
	21st to end	Day	26% 8% 18% 32% 14% 2	3000
July	1st to 10th	Day	26% 7% 17% 26% 18% 6%	6502
	11th to 20th	Day	24% 6% 15% 30% 19% 7%	6265
	21st to end	Day	25% 6% 10% 30% 20% 9%	6705
August	1st to 10th	Day	26% 5% 10% 29% 21% 9%	4536
	11th to 20th	Day	25% 5% 14% 33% 19% 3	4307
	21st to end	Day	24% 5% 11% 34% 22% 3	4375
September	1st to 10th	Day	29% 5% 10% 30% 21% 5%	2400
	11th to 20th	Day	31% 7% 17% 26% 16% 4	2400
	21st to end	Day	30% 6% 9% 30% 23% 3	2146
October	1st to 10th	Day	28% 4 10% 30% 24% 5%	3270
	11th to 20th	Day	30% 5% 11% 37% 17% 1	3233
	21st to end	Day	26% 7% 16% 35% 16% 1	3190
November	1st to 10th	Day	41% 7% 13% 26% 11% 2	1764
	11th to 20th	Day	36% 7% 24% 24% 9% 1	1680
	21st to end	Day	44% 8% 23% 17% 7% 1	1680
December	1st to 10th	Day	46% 6% 22% 19% 7%	2700
	11th to 20th	Day	49% 7% 22% 18% 3	3104
	21st to end	Day	38% 7% 12% 29% 11% 2	4092
January	1st to 10th	Night	45% 9% 20% 17% 7%	8202
	11th to 20th	Night	43% 6% 20% 16% 14% 1	8250
	21st to end	Night	40% 9% 22% 21% 8%	9026
February	1st to 10th	Night	48% 6% 18% 19% 8%	2781
	11th to 20th	Night	43% 9% 17% 20% 10% 1	2663
	21st to end	Night	41% 6% 17% 25% 11%	2112
March	1st to 10th	Night	33% 7% 16% 32% 13%	5494
	11th to 20th	Night	32% 8% 20% 32% 8%	5205
	21st to end	Night	56% 7% 15% 16% 6%	5249
April	1st to 10th	Night	40% 7% 14% 26% 11% 2	2100
	11th to 20th	Night	44% 7% 13% 25% 10% 1	2037
	21st to end	Night	39% 7% 14% 27% 12% 1	1720
May	1st to 10th	Night	33% 7% 9% 27% 21% 3	3640
	11th to 20th	Night	44% 9% 17% 21% 8%	3618
	21st to end	Night	32% 10% 14% 26% 16% 2	3972
June	1st to 10th	Night	34% 8% 14% 25% 17% 3	1600
	11th to 20th	Night	33% 8% 18% 24% 15% 2	1510
	21st to end	Night	26% 7% 19% 29% 16% 3	1400
July	1st to 10th	Night	26% 6% 21% 22% 21% 4	3325
	11th to 20th	Night	25% 5% 13% 31% 18% 8%	3592
	21st to end	Night	24% 7% 14% 25% 25% 5%	3856
August	1st to 10th	Night	28% 5% 11% 26% 23% 8%	2600
	11th to 20th	Night	22% 6% 18% 33% 16% 4	2816
	21st to end	Night	24% 5% 12% 32% 22% 5%	3533
September	1st to 10th	Night	22% 6% 10% 31% 23% 8%	2000
	11th to 20th	Night	26% 7% 15% 29% 18% 5%	2000
	21st to end	Night	28% 4 12% 29% 24% 3	2249
October	1st to 10th	Night	25% 4 9% 31% 26% 5%	3920
	11th to 20th	Night	29% 4 10% 36% 21% 1	3898
	21st to end	Night	30% 5% 14% 33% 16% 2	4595
November	1st to 10th	Night	39% 7% 15% 25% 11% 2	2751
	11th to 20th	Night	39% 7% 20% 25% 8% 1	2940
	21st to end	Night	40% 7% 22% 22% 8%	2940
December	1st to 10th	Night	51% 8% 20% 16% 5%	4710
	11th to 20th	Night	47% 8% 22% 19% 4	5322
	21st to end	Night	37% 6% 13% 28% 14% 2	7128

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	8% 7% 32% 32% 16% 4	330
	11th to 20th	Day	11% 10% 35% 28% 14% 3	330
	21st to end	Day	9% 14% 33% 31% 12% 1	363
February	1st to 10th	Day	15% 8% 37% 33% 6% 1	330
	11th to 20th	Day	9% 8% 35% 32% 16% 1	330
	21st to end	Day	8% 7% 37% 32% 14% 2	273
March	1st to 10th	Day	11% 12% 32% 29% 15% 2	330
	11th to 20th	Day	12% 12% 34% 25% 12% 4	489
	21st to end	Day	12% 8% 34% 29% 13% 3	594
April	1st to 10th	Day	12% 13% 34% 34% 6%	540
	11th to 20th	Day	17% 15% 34% 24% 8% 1	517
	21st to end	Day	15% 11% 27% 32% 13% 1	634
May	1st to 10th	Day	14% 9% 24% 32% 16% 5%	703
	11th to 20th	Day	16% 8% 25% 26% 19% 6%	725
	21st to end	Day	15% 8% 26% 27% 18% 6%	789
June	1st to 10th	Day	11% 12% 25% 30% 19% 3	730
	11th to 20th	Day	12% 16% 31% 28% 11% 3	730
	21st to end	Day	7% 7% 28% 34% 20% 5%	730
July	1st to 10th	Day	5% 3 26% 39% 23% 4	721
	11th to 20th	Day	4 7% 26% 41% 18% 4	718
	21st to end	Day	5% 3 25% 36% 26% 5%	794
August	1st to 10th	Day	6% 4 24% 38% 21% 7%	726
	11th to 20th	Day	6% 6% 24% 34% 25% 6%	588
	21st to end	Day	8% 7% 21% 33% 26% 6%	583
September	1st to 10th	Day	9% 8% 24% 33% 21% 5%	530
	11th to 20th	Day	10% 8% 24% 29% 26% 3	530
	21st to end	Day	14% 6% 26% 24% 24% 6%	345
October	1st to 10th	Day	18% 6% 23% 28% 17% 8%	330
	11th to 20th	Day	12% 9% 33% 26% 16% 4	330
	21st to end	Day	12% 15% 32% 26% 13% 2	363
November	1st to 10th	Day	16% 8% 31% 28% 15% 2	330
	11th to 20th	Day	8% 11% 33% 32% 14% 2	330
	21st to end	Day	7% 8% 36% 34% 13% 2	330
December	1st to 10th	Day	8% 11% 39% 29% 11% 1	330
	11th to 20th	Day	12% 10% 34% 32% 11% 1	330
	21st to end	Day	8% 6% 32% 34% 15% 5%	363
January	1st to 10th	Night	7% 8% 35% 37% 11% 1	1050
	11th to 20th	Night	9% 10% 35% 34% 11% 1	1050
	21st to end	Night	9% 9% 37% 35% 9% 1	1155
February	1st to 10th	Night	11% 7% 30% 37% 14% 1	891
	11th to 20th	Night	9% 6% 36% 39% 10%	824
	21st to end	Night	9% 6% 28% 37% 17% 3	692
March	1st to 10th	Night	8% 8% 35% 38% 10% 1	840
	11th to 20th	Night	9% 7% 34% 38% 11% 1	840
	21st to end	Night	11% 9% 30% 38% 11% 1	770
April	1st to 10th	Night	10% 9% 35% 38% 8% 1	630
	11th to 20th	Night	14% 9% 36% 34% 6%	611
	21st to end	Night	13% 8% 29% 41% 10%	600
May	1st to 10th	Night	14% 4 25% 41% 15% 1	600
	11th to 20th	Night	14% 4 26% 38% 18% 1	591
	21st to end	Night	14% 7% 25% 35% 18% 1	650
June	1st to 10th	Night	11% 8% 29% 35% 16%	600
	11th to 20th	Night	11% 8% 34% 37% 10%	510
	21st to end	Night	7% 6% 27% 46% 14% 1	400
July	1st to 10th	Night	7% 3 26% 47% 17% 1	466
	11th to 20th	Night	6% 5% 29% 52% 8%	582
	21st to end	Night	4 4 25% 53% 15%	657
August	1st to 10th	Night	6% 4 26% 49% 14% 1	597
	11th to 20th	Night	5% 4 23% 48% 18% 2	594
	21st to end	Night	6% 4 22% 48% 20%	660
September	1st to 10th	Night	8% 3 19% 48% 20% 2	600
	11th to 20th	Night	10% 3 25% 42% 18% 1	600
	21st to end	Night	13% 4 24% 41% 16% 1	665
October	1st to 10th	Night	12% 6% 26% 39% 16% 1	800
	11th to 20th	Night	11% 9% 28% 38% 14% 1	800
	21st to end	Night	11% 7% 36% 35% 10% 1	1085
November	1st to 10th	Night	14% 10% 30% 37% 8% 1	1025
	11th to 20th	Night	9% 9% 35% 35% 11% 1	1050
	21st to end	Night	8% 8% 34% 39% 9%	1050
December	1st to 10th	Night	10% 6% 35% 34% 13% 1	1050
	11th to 20th	Night	8% 9% 33% 37% 11% 1	1050
	21st to end	Night	11% 6% 31% 37% 14%	1155

Page generated at 2026-04-14 00:44:27. Version ac07

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