Punxsutawney
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Punxsutawney clear sky chart from 2005-11-06 to 2026-07-16.

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	16% 11% 4 10% 5% 5% 4 4 5% 6% 29%	138125
	Night	16% 12% 5% 10% 5% 5% 4 3 4 6% 29%	134517
Transparency	Day	54% 6% 11% 19% 10% 1	141723
	Night	55% 6% 10% 18% 10% 1	138991
Seeing	Day	25% 16% 28% 19% 9% 3	16850
	Night	24% 14% 27% 25% 10% 1	26381

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% 19% 8% 27% 7% 4 3 2 3 3 9%	4883
	11th to 20th	Day	10% 18% 10% 24% 11% 7% 3 2 2 2 10%	5280
	21st to end	Day	18% 14% 8% 14% 8% 8% 4 3 4 4 15%	5780
February	1st to 10th	Day	17% 19% 6% 12% 8% 6% 4 2 3 5% 19%	1890
	11th to 20th	Day	16% 14% 7% 15% 8% 5% 4 3 4 5% 18%	1843
	21st to end	Day	19% 18% 4 12% 5% 4 4 3 5% 5% 21%	1703
March	1st to 10th	Day	17% 12% 6% 9% 5% 4 4 3 4 5% 31%	5045
	11th to 20th	Day	12% 13% 7% 9% 5% 5% 4 3 4 6% 32%	5090
	21st to end	Day	15% 11% 4 10% 6% 5% 4 4 4 5% 31%	5586
April	1st to 10th	Day	17% 16% 3 7% 5% 4 4 4 5% 6% 28%	2480
	11th to 20th	Day	17% 13% 3 7% 5% 4 4 4 5% 6% 32%	2494
	21st to end	Day	21% 12% 3 6% 5% 4 3 3 5% 7% 32%	2693
May	1st to 10th	Day	21% 10% 3 8% 5% 5% 5% 4 6% 6% 25%	7616
	11th to 20th	Day	18% 10% 3 8% 5% 5% 5% 4 6% 8% 28%	7860
	21st to end	Day	22% 9% 3 7% 4 4 5% 4 5% 6% 32%	9045
June	1st to 10th	Day	15% 7% 3 7% 5% 5% 5% 4 7% 7% 34%	2940
	11th to 20th	Day	16% 8% 3 6% 5% 5% 6% 4 6% 8% 33%	2940
	21st to end	Day	15% 6% 2 6% 5% 5% 6% 4 6% 9% 35%	2940
July	1st to 10th	Day	10% 7% 3 7% 5% 6% 6% 4 6% 8% 39%	6500
	11th to 20th	Day	11% 7% 3 8% 6% 7% 6% 5% 8% 10% 31%	6137
	21st to end	Day	11% 8% 3 7% 5% 5% 5% 4 5% 7% 41%	6424
August	1st to 10th	Day	16% 10% 4 8% 6% 6% 5% 4 6% 7% 28%	4234
	11th to 20th	Day	13% 7% 3 8% 5% 5% 7% 4 6% 8% 33%	4174
	21st to end	Day	11% 6% 2 7% 5% 5% 5% 5% 8% 10% 38%	4363
September	1st to 10th	Day	16% 7% 3 6% 4 4 3 3 5% 6% 43%	2400
	11th to 20th	Day	13% 6% 2 6% 4 4 4 3 7% 8% 42%	2298
	21st to end	Day	22% 9% 3 6% 5% 3 4 3 5% 7% 32%	2145
October	1st to 10th	Day	18% 8% 2 6% 5% 4 4 3 6% 7% 37%	2000
	11th to 20th	Day	20% 10% 3 7% 4 5% 4 4 5% 6% 33%	2000
	21st to end	Day	23% 12% 3 7% 4 4 5% 3 4 5% 30%	2200
November	1st to 10th	Day	12% 9% 3 7% 5% 4 4 3 6% 7% 39%	1984
	11th to 20th	Day	17% 17% 5% 8% 5% 4 4 3 5% 5% 27%	1680
	21st to end	Day	19% 19% 7% 8% 5% 4 3 3 5% 6% 21%	1680
December	1st to 10th	Day	18% 19% 8% 24% 5% 3 3 2 3 3 12%	2680
	11th to 20th	Day	20% 20% 7% 11% 5% 3 3 2 3 4 21%	3070
	21st to end	Day	23% 24% 6% 10% 4 4 4 3 4 4 14%	4048
January	1st to 10th	Night	13% 19% 8% 24% 8% 4 3 3 3 3 11%	7993
	11th to 20th	Night	11% 17% 8% 23% 11% 7% 4 3 3 3 11%	7680
	21st to end	Night	16% 15% 7% 13% 8% 8% 5% 2 4 4 19%	8401
February	1st to 10th	Night	17% 14% 5% 13% 8% 6% 4 3 3 4 21%	2730
	11th to 20th	Night	18% 14% 5% 14% 7% 5% 5% 3 4 5% 21%	2663
	21st to end	Night	19% 13% 4 12% 5% 5% 4 4 4 4 24%	2097
March	1st to 10th	Night	19% 12% 6% 8% 7% 3 3 3 4 5% 30%	5028
	11th to 20th	Night	12% 12% 7% 7% 4 3 3 3 5% 6% 38%	5090
	21st to end	Night	15% 11% 4 9% 5% 4 4 3 4 6% 34%	5588
April	1st to 10th	Night	18% 15% 5% 7% 5% 4 4 3 4 6% 30%	2138
	11th to 20th	Night	16% 11% 3 7% 4 4 5% 3 5% 6% 36%	2075
	21st to end	Night	15% 12% 2 8% 5% 4 4 3 5% 6% 35%	1944
May	1st to 10th	Night	24% 11% 3 7% 4 4 4 4 5% 7% 27%	5237
	11th to 20th	Night	18% 13% 3 8% 4 4 4 3 5% 6% 33%	4997
	21st to end	Night	23% 9% 2 6% 4 4 4 3 5% 7% 33%	5108
June	1st to 10th	Night	11% 8% 2 7% 5% 5% 4 4 4 8% 43%	1680
	11th to 20th	Night	14% 6% 2 7% 5% 5% 5% 4 6% 8% 38%	1680
	21st to end	Night	13% 7% 3 5% 4 5% 4 4 6% 9% 41%	1680
July	1st to 10th	Night	13% 9% 3 7% 4 4 4 4 5% 8% 40%	3678
	11th to 20th	Night	12% 7% 2 8% 5% 5% 6% 5% 8% 8% 35%	3912
	21st to end	Night	11% 7% 2 7% 4 4 4 3 5% 7% 44%	4427
August	1st to 10th	Night	16% 9% 3 6% 4 5% 5% 4 5% 7% 35%	2915
	11th to 20th	Night	16% 7% 2 7% 4 4 5% 4 5% 8% 40%	2875
	21st to end	Night	9% 5% 2 6% 4 5% 5% 4 6% 8% 45%	3487
September	1st to 10th	Night	14% 7% 2 5% 3 3 5% 3 5% 6% 48%	2000
	11th to 20th	Night	11% 5% 2 5% 3 4 4 3 5% 8% 51%	2098
	21st to end	Night	18% 8% 3 8% 4 4 4 3 4 7% 36%	2255
October	1st to 10th	Night	17% 6% 2 6% 4 4 3 3 5% 7% 42%	2400
	11th to 20th	Night	18% 9% 2 7% 5% 4 4 3 6% 6% 37%	2400
	21st to end	Night	22% 11% 3 7% 4 4 3 3 5% 5% 33%	2640
November	1st to 10th	Night	12% 11% 3 5% 4 3 4 4 4 7% 42%	2526
	11th to 20th	Night	18% 15% 4 8% 5% 5% 4 4 5% 6% 27%	2940
	21st to end	Night	19% 15% 6% 9% 5% 4 4 3 4 5% 25%	2940
December	1st to 10th	Night	17% 16% 10% 19% 5% 4 3 3 4 5% 14%	4720
	11th to 20th	Night	22% 15% 7% 12% 6% 4 3 3 3 4 21%	5345
	21st to end	Night	18% 20% 7% 12% 5% 4 4 3 4 4 17%	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	82% 3 6% 6% 2	4884
	11th to 20th	Day	82% 3 5% 7% 2	5280
	21st to end	Day	72% 4 9% 11% 4	5780
February	1st to 10th	Day	71% 3 8% 12% 6%	1890
	11th to 20th	Day	68% 5% 9% 12% 5%	1852
	21st to end	Day	64% 4 11% 13% 6% 1	1703
March	1st to 10th	Day	55% 5% 12% 21% 7%	5045
	11th to 20th	Day	52% 6% 16% 19% 7% 2	5090
	21st to end	Day	53% 6% 9% 19% 12% 1	5586
April	1st to 10th	Day	55% 7% 10% 16% 11% 1	2480
	11th to 20th	Day	51% 5% 12% 17% 14% 2	2494
	21st to end	Day	51% 6% 9% 20% 12% 1	2693
May	1st to 10th	Day	55% 7% 11% 18% 7% 2	7651
	11th to 20th	Day	52% 7% 11% 19% 10% 1	7864
	21st to end	Day	49% 7% 11% 19% 13% 1	9061
June	1st to 10th	Day	45% 8% 11% 22% 13% 1	2940
	11th to 20th	Day	47% 7% 14% 19% 12% 1	2940
	21st to end	Day	44% 7% 13% 24% 12%	2940
July	1st to 10th	Day	41% 7% 11% 27% 13% 1	6430
	11th to 20th	Day	43% 8% 15% 23% 10%	6064
	21st to end	Day	40% 6% 9% 24% 20%	6240
August	1st to 10th	Day	52% 8% 13% 19% 8%	4221
	11th to 20th	Day	43% 8% 13% 26% 9% 1	4213
	21st to end	Day	38% 8% 14% 27% 12% 1	4363
September	1st to 10th	Day	42% 6% 9% 24% 17% 3	2400
	11th to 20th	Day	38% 7% 13% 26% 16% 1	2298
	21st to end	Day	50% 6% 12% 19% 13% 1	2145
October	1st to 10th	Day	38% 6% 11% 27% 18% 1	3260
	11th to 20th	Day	45% 6% 12% 20% 13% 4	3240
	21st to end	Day	43% 4 11% 27% 15% 1	3538
November	1st to 10th	Day	43% 7% 12% 20% 16% 2	1984
	11th to 20th	Day	58% 5% 10% 17% 8% 2	1680
	21st to end	Day	64% 5% 10% 14% 5%	1680
December	1st to 10th	Day	79% 4 8% 7% 2	2680
	11th to 20th	Day	68% 4 10% 15% 3	3066
	21st to end	Day	74% 4 8% 10% 4	4048
January	1st to 10th	Night	78% 4 6% 9% 2	7994
	11th to 20th	Night	79% 4 8% 7% 2	7680
	21st to end	Night	69% 4 9% 13% 5% 1	8401
February	1st to 10th	Night	67% 4 8% 15% 6%	2730
	11th to 20th	Night	66% 4 9% 15% 6%	2665
	21st to end	Night	62% 5% 8% 15% 8% 1	2097
March	1st to 10th	Night	57% 5% 11% 19% 8% 1	5028
	11th to 20th	Night	46% 6% 15% 22% 7% 3	5090
	21st to end	Night	49% 5% 10% 18% 16% 1	5588
April	1st to 10th	Night	56% 5% 10% 17% 12% 1	2138
	11th to 20th	Night	49% 6% 11% 19% 13% 2	2075
	21st to end	Night	48% 6% 10% 22% 12% 2	1944
May	1st to 10th	Night	55% 7% 9% 15% 12% 2	5264
	11th to 20th	Night	50% 7% 10% 23% 9% 1	4998
	21st to end	Night	49% 7% 10% 20% 12% 2	5115
June	1st to 10th	Night	38% 8% 12% 25% 14% 2	1680
	11th to 20th	Night	41% 8% 13% 23% 13% 2	1680
	21st to end	Night	40% 8% 14% 24% 14% 1	1680
July	1st to 10th	Night	43% 6% 10% 24% 16% 1	3640
	11th to 20th	Night	42% 9% 17% 21% 11% 1	3866
	21st to end	Night	37% 6% 10% 22% 23% 1	4297
August	1st to 10th	Night	46% 8% 14% 22% 9% 1	2904
	11th to 20th	Night	41% 6% 13% 28% 11% 1	2902
	21st to end	Night	34% 8% 14% 31% 12% 2	3487
September	1st to 10th	Night	36% 7% 12% 24% 19% 3	2000
	11th to 20th	Night	31% 6% 12% 29% 20% 1	2098
	21st to end	Night	48% 6% 11% 19% 15% 1	2255
October	1st to 10th	Night	38% 5% 9% 25% 22% 1	3920
	11th to 20th	Night	39% 6% 12% 22% 15% 7%	3899
	21st to end	Night	40% 4 12% 24% 19% 1	4252
November	1st to 10th	Night	42% 6% 12% 21% 17% 3	2526
	11th to 20th	Night	57% 5% 10% 17% 9% 2	2940
	21st to end	Night	60% 6% 10% 18% 5% 1	2940
December	1st to 10th	Night	72% 6% 11% 8% 3	4720
	11th to 20th	Night	67% 4 11% 14% 3	5348
	21st to end	Night	69% 5% 9% 12% 4	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	36% 27% 23% 10% 3	261
	11th to 20th	Day	38% 31% 24% 5% 2	330
	21st to end	Day	33% 25% 31% 9% 2	363
February	1st to 10th	Day	31% 27% 32% 7% 3	330
	11th to 20th	Day	40% 26% 29% 5%	330
	21st to end	Day	36% 26% 30% 8% 1	361
March	1st to 10th	Day	31% 24% 30% 13% 3	540
	11th to 20th	Day	35% 21% 28% 11% 3 1	540
	21st to end	Day	33% 24% 26% 13% 4 1	594
April	1st to 10th	Day	32% 22% 27% 15% 4 1	540
	11th to 20th	Day	28% 21% 29% 13% 6% 3	532
	21st to end	Day	31% 18% 31% 15% 5% 1	540
May	1st to 10th	Day	30% 19% 28% 15% 6% 2	543
	11th to 20th	Day	25% 14% 33% 17% 8% 3	567
	21st to end	Day	22% 12% 25% 23% 13% 4	617
June	1st to 10th	Day	17% 17% 29% 24% 11% 2	570
	11th to 20th	Day	20% 15% 27% 22% 12% 3	570
	21st to end	Day	19% 12% 31% 25% 12% 2	570
July	1st to 10th	Day	15% 8% 24% 26% 17% 9%	565
	11th to 20th	Day	12% 8% 27% 31% 16% 6%	544
	21st to end	Day	14% 7% 30% 29% 16% 6%	576
August	1st to 10th	Day	13% 7% 23% 32% 17% 8%	526
	11th to 20th	Day	15% 7% 25% 28% 16% 9%	519
	21st to end	Day	13% 9% 27% 26% 17% 9%	583
September	1st to 10th	Day	18% 8% 23% 25% 18% 9%	530
	11th to 20th	Day	11% 5% 22% 31% 23% 8%	530
	21st to end	Day	27% 13% 24% 20% 12% 4	530
October	1st to 10th	Day	20% 13% 22% 24% 15% 6%	530
	11th to 20th	Day	25% 16% 32% 19% 8% 2	530
	21st to end	Day	31% 17% 29% 16% 6%	583
November	1st to 10th	Day	21% 18% 30% 18% 11% 1	484
	11th to 20th	Day	32% 21% 32% 11% 3	220
	21st to end	Day	33% 20% 37% 9% 1	220
December	1st to 10th	Day	36% 26% 28% 7% 2 1	220
	11th to 20th	Day	39% 20% 34% 5% 3	220
	21st to end	Day	42% 20% 27% 8% 3	242
January	1st to 10th	Night	29% 23% 34% 11% 3	840
	11th to 20th	Night	33% 23% 28% 14% 2	840
	21st to end	Night	28% 24% 31% 15% 2	924
February	1st to 10th	Night	30% 20% 30% 20% 1	840
	11th to 20th	Night	31% 23% 34% 11% 1	823
	21st to end	Night	30% 23% 30% 15% 2	692
March	1st to 10th	Night	28% 19% 33% 18% 2	840
	11th to 20th	Night	29% 20% 27% 18% 5%	840
	21st to end	Night	25% 17% 36% 18% 4 1	924
April	1st to 10th	Night	28% 19% 29% 20% 4	840
	11th to 20th	Night	24% 17% 30% 21% 7% 1	831
	21st to end	Night	21% 13% 33% 28% 5%	684
May	1st to 10th	Night	23% 12% 26% 30% 8% 1	630
	11th to 20th	Night	22% 10% 29% 30% 9%	540
	21st to end	Night	16% 7% 26% 30% 20% 1	455
June	1st to 10th	Night	15% 4 29% 39% 12% 1	420
	11th to 20th	Night	15% 7% 25% 39% 13%	420
	21st to end	Night	12% 5% 29% 40% 14%	420
July	1st to 10th	Night	13% 3 19% 43% 19% 3	410
	11th to 20th	Night	12% 4 18% 39% 24% 3	516
	21st to end	Night	14% 3 17% 42% 22% 1	657
August	1st to 10th	Night	12% 2 18% 43% 23% 2	597
	11th to 20th	Night	14% 5% 15% 37% 26% 3	594
	21st to end	Night	12% 4 19% 37% 24% 4	820
September	1st to 10th	Night	16% 6% 20% 32% 23% 3	800
	11th to 20th	Night	12% 5% 18% 34% 27% 4	800
	21st to end	Night	21% 10% 22% 28% 16% 4	800
October	1st to 10th	Night	19% 8% 22% 30% 19% 2	800
	11th to 20th	Night	24% 13% 29% 25% 8% 1	800
	21st to end	Night	29% 14% 28% 25% 5%	880
November	1st to 10th	Night	20% 13% 30% 27% 9%	820
	11th to 20th	Night	30% 15% 28% 21% 6% 1	840
	21st to end	Night	29% 19% 30% 17% 4	840
December	1st to 10th	Night	32% 22% 29% 14% 4	840
	11th to 20th	Night	30% 24% 27% 16% 3	840
	21st to end	Night	30% 22% 27% 19% 2	924

Page generated at 2026-07-13 03:14:54. Version ac07

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